ASTM B166-24

Standard Specification for Nickel-Chromium-Aluminum Alloy, Nickel-Chromium-Iron Alloys, Nickel-Chromium-Cobalt-Molybdenum Alloy, Nickel-Iron-Chromium-Tungsten Alloy, and Nickel-Chromium-Molybdenum-Copper Alloy Rod, Bar, and Wire

ABSTRACT
This specification covers nickel-chromium-iron alloys (UNS N06600, N06601, N06603, N06690, N06693, N06025, N06045, and N06696) and nickel-chromium-cobaltmolybdenum alloy (UNS N06617) in the form of hot-finished and cold-worked rounds, squares, hexagons, rectangles, and cold-worked wire. The material shall conform to the composition limits specified in a reference material. The material shall be uniform in quality and condition, smooth, commercially straight or flat, and free of injurious imperfections. Mechanical properties of the alloys like tensile strength, yield strength, elongation, and hardness shall be determined by tension and hardness tests.
SCOPE
1.1 This specification2 covers nickel-chromium-aluminum alloy, nickel-chromium-iron alloys,3 nickel-chromium-cobalt-molybdenum alloy, nickel-iron-chromium-tungsten alloy, and nickel-chromim-molybdenum-copper alloy in the form of hot-finished and cold-worked rounds, squares, hexagons, rectangles, and cold-worked wire.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.3 The following precautionary caveat pertains only to the test methods portion, Section 12, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Mar-2024
• ICS: 77.150.40 - Nickel and chromium products
• Technical Committee: B02 - Nonferrous Metals and Alloys
• Drafting Committee: B02.07 - Refined Nickel and Cobalt and Their Alloys

Relations

• Replaces: ASTM B166-19 - Standard Specification for Nickel-Chromium-Aluminum Alloy, Nickel-Chromium-Iron Alloys, Nickel-Chromium-Cobalt-Molybdenum Alloy, Nickel-Iron-Chromium-Tungsten Alloy, and Nickel-Chromium-Molybdenum-Copper Alloy Rod, Bar, and Wire
• Effective Date: 01-Apr-2024
• Referred By: ASTM F1511-18(2023) - Standard Specification for Mechanical Seals for Shipboard Pump Applications
• Effective Date: 01-Apr-2024
• Referred By: ASTM B168-19e1 - Standard Specification for Nickel-Chromium-Aluminum Alloys (UNS N06699), Nickel-Chromium-Iron Alloys (UNS N06600, N06601, N06603, N06690, N06693, N06025, N06045, and N06696), Nickel-Chromium-Cobalt-Molybdenum Alloy (UNS N06617), Nickel-Iron-Chromium-Tungsten Alloy (UNS N06674), and Nickel-Chromium-Molybdenum-Copper Alloy (UNS N06235) Plate, Sheet, and Strip
• Effective Date: 01-Apr-2024
• Referred By: ASTM E1025-18 - Standard Practice for Design, Manufacture, and Material Grouping Classification of Hole-Type Image Quality Indicators (IQI) Used for Radiography
• Effective Date: 01-Apr-2024
• Referred By: ASTM B366/B366M-23 - Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings
• Effective Date: 01-Apr-2024
• Referred By: ASTM B462-18e1 - Standard Specification for Forged or Rolled Nickel Alloy Pipe Flanges, Forged Fittings, and Valves and Parts for Corrosive High-Temperature Service
• Effective Date: 01-Apr-2024
• Referred By: ASTM F1138-21 - Standard Specification for Spray Shields for Mechanical Joints
• Effective Date: 01-Apr-2024
• Referred By: ASTM E747-18 - Standard Practice for Design, Manufacture and Material Grouping Classification of Wire Image Quality Indicators (IQI) Used for Radiology
• Effective Date: 01-Apr-2024
• Referred By: ASTM E1647-16(2022) - Standard Practice for Determining Contrast Sensitivity in Radiology
• Effective Date: 01-Apr-2024

Overview

ASTM B166-24 is the internationally recognized standard specification for nickel-chromium-aluminum alloy, nickel-chromium-iron alloys, nickel-chromium-cobalt-molybdenum alloy, nickel-iron-chromium-tungsten alloy, and nickel-chromium-molybdenum-copper alloy rod, bar, and wire. Issued by ASTM International, this standard defines the chemical, mechanical, and physical properties required for these nickel-based alloys supplied as hot-finished and cold-worked rounds, squares, hexagons, rectangles, and cold-worked wire.

This specification covers a range of widely used UNS designations, including N06600, N06601, N06603, N06690, N06693, N06025, N06045, N06696, and N06617. ASTM B166-24 ensures that products meet rigorous requirements for performance in demanding applications, providing guidance on composition, dimensions, tolerance, mechanical strength, and testing methods.

Key Topics

• Product Forms: Specifies requirements for rod, bar, and wire in several cross-sectional shapes including rounds, squares, hexagons, and rectangles.
• Alloy Coverage: Details composition and property standards for key nickel-based alloys, including their UNS numbers.
• Mechanical Properties: Outlines limits and test requirements for tensile strength, yield strength, elongation, and hardness, ensuring high performance in end-use conditions.
• Dimensional Tolerances: Lists tolerances for diameter, thickness, width, length, and straightness for both hot-finished and cold-worked products.
• Surface Quality: Requires materials to be uniform, smooth, commercially straight or flat, and free of injurious imperfections.
• Certification & Marking: Mandates manufacturer certification and requires product marking for traceability and regulatory compliance.
• Test Methods: References standard test procedures for chemical analysis, tension, and hardness testing to confirm compliance.
• Ordering Information: Instructs purchasers on specifying alloy, UNS number, condition, dimensions, quantity, and inspection requirements.

Applications

ASTM B166-24 is critical for industries requiring high-performance alloys in challenging environments. The specification is used extensively in:

• Aerospace and Aviation: Nickel-chromium alloys are commonly used for components exposed to high temperatures and corrosive environments, such as turbine engine parts and exhaust systems.
• Chemical and Petrochemical Processing: Resistant to oxidizing and reducing environments, specified alloys are widely utilized in heat exchangers, reactors, piping, and valves.
• Power Generation: Essential for steam generator tubing, structural components, and fasteners in nuclear and fossil fuel power plants.
• Oil & Gas: Components such as downhole tools, valves, and wireline cables benefit from the durability and corrosion resistance offered by these alloys.
• Electronics and Electrical Applications: High-conductivity and resistance to heat make these alloys suitable for precision wire and electrical components.
• Marine Engineering: Provides longevity in seawater environments, supporting construction of pumps, valves, and instrumentation.
• Heat Treatment and Furnace Construction: Used in trays, baskets, fixtures, and other components subject to high thermal cycling.

Related Standards

ASTM B166-24 references and is complemented by several other key standards, including:

• ASTM B168 - Specification for similar nickel-chromium-aluminum and nickel-chromium-iron alloys in plate, sheet, and strip forms.
• ASTM B880 - General requirements for chemical check analysis limits for nickel, nickel alloys, and cobalt alloys.
• ASTM B899 - Terminology relating to non-ferrous metals and alloys.
• ASTM E8/E8M - Standard test methods for tension testing of metallic materials.
• ASTM E18 - Standard test methods for Rockwell hardness of metallic materials.
• ASTM E140 - Hardness conversion tables for metals.
• ASTM E112 - Test methods for determining average grain size.
• ASME SB-166 - Parallel specification used for Boiler and Pressure Vessel Code applications.

These standards ensure that users of ASTM B166-24 benefit from a consistent, globally accepted framework for specifying, testing, and procuring high-quality nickel alloy rod, bar, and wire products, supporting reliability and performance in critical applications.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: B166 − 24
Standard Specification for
Nickel-Chromium-Aluminum Alloy, Nickel-Chromium-Iron
Alloys, Nickel-Chromium-Cobalt-Molybdenum Alloy, Nickel-
Iron-Chromium-Tungsten Alloy, and Nickel-Chromium-
Molybdenum-Copper Alloy Rod, Bar, and Wire
This standard is issued under the fixed designation B166; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* 2. Referenced Documents
1.1 This specification covers nickel-chromium-aluminum
2.1 ASTM Standards:
alloy, nickel-chromium-iron alloys, nickel-chromium-cobalt-
B168 Specification for Nickel-Chromium-Aluminum Alloys
molybdenum alloy, nickel-iron-chromium-tungsten alloy, and
(UNS N06699), Nickel-Chromium-Iron Alloys (UNS
nickel-chromim-molybdenum-copper alloy in the form of hot-
N06600, N06601, N06603, N06690, N06693, N06025,
finished and cold-worked rounds, squares, hexagons,
N06045, and N06696), Nickel-Chromium-Cobalt-
rectangles, and cold-worked wire.
Molybdenum Alloy (UNS N06617), Nickel-Iron-
Chromium-Tungsten Alloy (UNS N06674), and
1.2 The values stated in inch-pound units are to be regarded
B880 Specification for General Requirements for Chemical
as standard. The values given in parentheses are mathematical
Check Analysis Limits for Nickel, Nickel Alloys and
conversions to SI units that are provided for information only
and are not considered standard. Cobalt Alloys
B899 Terminology Relating to Non-ferrous Metals and Al-
1.3 The following precautionary caveat pertains only to the
loys
test methods portion, Section 12, of this specification: This
E8/E8M Test Methods for Tension Testing of Metallic Ma-
standard does not purport to address all of the safety concerns,
terials
if any, associated with its use. It is the responsibility of the user
E18 Test Methods for Rockwell Hardness of Metallic Ma-
of this standard to become familiar with all hazards including
terials
those identified in the appropriate Safety Data Sheet (SDS) for
E29 Practice for Using Significant Digits in Test Data to
this product/material as provided by the manufacturer, to
Determine Conformance with Specifications
establish appropriate safety, health, and environmental prac-
E38 Methods for Chemical Analysis of Nickel-Chromium
tices and determine the applicability of regulatory limitations
prior to use. and Nickel-Chromium-Iron Alloys (Withdrawn 1989)
E112 Test Methods for Determining Average Grain Size
1.4 This international standard was developed in accor-
E140 Hardness Conversion Tables for Metals Relationship
dance with internationally recognized principles on standard-
Among Brinell Hardness, Vickers Hardness, Rockwell
ization established in the Decision on Principles for the
Hardness, Superficial Hardness, Knoop Hardness, Sclero-
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical scope Hardness, and Leeb Hardness
Barriers to Trade (TBT) Committee.
E527 Practice for Numbering Metals and Alloys in the
Unified Numbering System (UNS)
E1473 Test Methods for Chemical Analysis of Nickel,
Cobalt, and High-Temperature Alloys
This specification is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.07 on Refined Nickel and Cobalt and Their Alloys.
Current edition approved April 1, 2024. Published April 2024. Originally
approved in 1941. Last previous edition approved in 2019 as B166 – 19. DOI: For referenced ASTM standards, visit the ASTM website, www.astm.org, or
10.1520/B0166-24. contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
For ASME Boiler and Pressure Vessel Code application see related Specifica- Standards volume information, refer to the standard’s Document Summary page on
tion SB-166 in Section II of that Code. the ASTM website.
3 5
Designation established in accordance with Practice E527 and SAE J1086, The last approved version of this historical standard is referenced on
Practice for Numbering Metals and Alloys (UNS). www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B166 − 24
2.2 Federal Standards: 5. Chemical Composition
Fed. Std. No. 102 Preservation, Packaging and Packing
5.1 The material shall conform to the composition limits
Levels
specified in Table 1.
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
5.2 If a product (check) analysis is performed by the
Fed. Std. No. 182 Continuous Identification Marking of
purchaser, the material shall conform to the product (check)
Nickel and Nickel-Base Alloys
analysis variations in Specification B880.
2.3 Military Standard:
MIL-STD-129 Marking for Shipment and Storage
6. Mechanical Properties and Other Requirements
6.1 Mechanical Properties—The material shall conform to
3. Terminology
the mechanical properties specified in Table 2 for rod and bar
3.1 For definitions of terms used in this specification, refer
and Table 3 (UNS N06600 and N06690 only) for wire.
to Terminology B899.
6.2 Grain Size:
3.2 In case of conflict between the definitions of this
6.2.1 Grain size for N06674 shall be 7 or coarser as
specification and Terminology B899, this specification shall
determined in accordance with Test Methods E112.
prevail.
3.3 Definitions of Terms Specific to This Standard:
7. Dimensions and Permissible Variations
3.3.1 bar, n—material of rectangular (flats), hexagonal, or
7.1 Diameter, Thickness, or Width—The permissible varia-
square solid section up to and including 10 in. (254 mm) in
tions from the specified dimensions as measured on the
width and ⁄8 in. (3.2 mm) and over in thickness in straight
diameter or between parallel surfaces of cold-worked rod and
lengths.
bar shall be as prescribed in Table 4; of hot-worked rod and bar
3.3.2 rod, n—material of round solid section furnished in
as prescribed in Table 5; and of wire as prescribed in Table 6.
straight lengths.
7.2 Out-of-Round—Hot-worked rods and cold-worked rods
3.3.2.1 Discussion—Hot-worked rectangular bar in widths
(except “forging quality”) all sizes, in straight lengths, shall not
10 in. and under may be furnished as hot-rolled plate with
be out-of-round by more than one half the total permissible
sheared or cut edges in accordance with Specification B168,
variations in diameter shown in Table 4 and Table 5, except for
provided the mechanical property requirements of this speci-
hot-worked rods ⁄2 in. (12.7 mm) in diameter and under, which
fication are met.
may be out-of-round by the total permissible variations in
3.3.3 wire, n—a cold-worked solid product of uniform
diameter shown in Table 5. Cold-worked wire shall not be
round cross section along its whole length, supplied in coil
out-of-round by more than one-half the total permissible
form.
variations in diameter shown in Table 6.
7.3 Corners—Cold-worked bars will have practically exact
4. Ordering Information
angles and sharp corners.
4.1 It is the responsibility of the purchaser to specify all
7.4 Machining Allowances for Hot-Worked Materials—
requirements that are necessary for the safe and satisfactory
When the surfaces of hot-worked products are to be machined,
performance of material ordered under this specification.
the allowances prescribed in Table 7 are recommended for
Examples of such requirements include, but are not limited to,
normal machining operations.
the following:
4.1.1 Alloy Name or UNS Number—see Table 1,
7.5 Length—The permissible variations in length of cold-
4.1.2 ASTM Designation, including year of issue,
worked and hot-worked rod and bar shall be as prescribed in
4.1.3 Section—Rod (round), bar (square, hexagonal, or
Table 8.
rectangular), or wire (round),
7.5.1 Rods and bars ordered to random or nominal lengths
4.1.4 Condition (see Table 2 and Table 3),
will be furnished with either cropped or saw-cut ends; material
4.1.5 Finish,
ordered to cut lengths will be furnished with square saw-cut or
4.1.6 Dimensions, including length (see Tables 4-8),
machined ends.
4.1.7 Quantity—feet or number of pieces,
7.6 Straightness—The permissible variations in straightness
4.1.8 Samples for Product (Check) Analysis—State whether
of cold-worked rod and bar as determined by the departure
samples for product (check) analysis shall be furnished, and
from straightness shall be as prescribed in Table 9.
4.1.9 Purchaser Inspection—If purchaser wishes to witness
7.6.1 The permissible variations in straightness of hot-
tests or inspection of material at place of manufacture, the
worked rod and bar as determined by the departure from
purchase order must so state indicating which test or inspec-
straightness shall be as specified in Table 10.
tions are to be witnessed.
8. Workmanship, Finish, and Appearance
8.1 The material shall be uniform in quality and condition,
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
smooth, commercially straight or flat, and free of injurious
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
www.dodssp.daps.mil. imperfections.
B166 − 24
A
TABLE 1 Chemical Requirements
Composition Limits, %
Element
Alloy Alloy Alloy Alloy Alloy Alloy Alloy Alloy Alloy Alloy Alloy Alloy
N06600 N06601 N06617 N06674 N06690 N06693 N06025 N06045 N06603 N06696 N06699 N06235
B B B B B B B
Nickel 72.0 min 58.0–63.0 44.5 min remainder 58.0 min remainder remainder 45.0 min remainder remainder remainder remainder
Chromium 14.0–17.0 21.0–25.0 20.0–24.0 21.5–24.5 27.0–31.0 27.0–31.0 24.0-26.0 26.0-29.0 24.0-26.0 28.0-32.0 26.0-30.0 30.0-32.5
Cobalt . . 10.0–15.0 . . . . . . . 1.0
Molybdenum . . 8.0–10.0 . . . . . . 1.0-3.0 . 5.0-6.2
B
Iron 6.0–10.0 remainder 3.0 20.0–27.0 7.0–11.0 2.5–6.0 8.0–11.0 21.0-25.0 8.0-11.0 2.0-6.0 2.5 1.5
Manganese 1.0 1.0 1.0 1.50 0.5 1.0 0.15 1.0 0.15 1.0 0.50 0.3-0.65
Aluminum . 1.0–1.7 0.8–1.5 . . 2.5–4.0 1.8-2.4 . 2.4-3.0 . 1.9-3.0 0.2-0.4
Carbon 0.15 0.10 0.05–0.15 0.01 0.05 max 0.15 0.15-0.25 0.05-0.12 0.20-0.40 0.15 0.005-0.10 0.02-0.06
Copper 0.5 1.0 0.5 . 0.5 max 0.5 0.1 0.3 0.50 1.5-3.0 0.50 3.5-4.0
Silicon 0.5 0.5 1.0 1.0 0.5 max 0.5 0.5 2.5-3.0 0.50 1.0-2.5 0.50 0.2-0.6
Sulfur 0.015 0.015 0.015 0.015 0.015 max 0.01 0.010 0.010 0.010 0.010 0.01 0.015
Titanium . . 0.6 0.05–0.20 . 1.0 0.1-0.2 . 0.01-0.25 1.0 0.60 0.5
Phosphorus . . . 0.030 . . 0.020 0.020 0.20 . 0.02 0.03
Zirconium . . . . . . 0.01-0.10 . 0.01-0.10 . 0.10 .
Yttrium . . . . . . 0.05-0.12 . 0.01-0.15 . . .
Boron . . 0.006 0.0005–0.006 . . . . . . 0.008 .
Nitrogen . . . 0.02 . . . . . . 0.05 .
Niobium . . . 0.10–0.35 . 0.5–2.5 . . . . 0.50 1.0
Cerium . . . . . . . 0.03-0.09 . . . .
Tungsten . . . 6.0–8.0 . . . . . . . 0.60
A
All values are maximums unless a range is provided or is a minimum or a remainder.
B
Element shall be determined arithmetically by difference.

B166 − 24
TABLE 2 Mechanical Properties of Rods and Bars
Condition and Diameter or Distance Tensile Strength, Yield Strength (0.2 % Elongation in 2 in. or
Between Parallel Surfaces, in. (mm) min, psi (MPa) offset), min, psi (MPa) 50 mm or 4D, min,%
UNS N06600:
Cold-worked (as worked):
Rounds:
1 A
Under ⁄2 (12.7) 120 000 (825) 90 000 (620) 7
⁄2 to 1 (12.7 to 25.4), incl 110 000 (760) 85 000 (585) 10
Over 1 to 2 ⁄2 (25.4 to 63.5), incl 105 000 (725) 80 000 (550) 12
Squares, hexagons, and rectangles:
A
⁄4 (6.4) and under 100 000 (690) 80 000 (550) 5
1 1
Over ⁄4 to ⁄2 (6.4 to 12.7), excl 95 000 (655) 70 000 (480)
Hot worked (as worked):
Rounds:
1 1
⁄4 to ⁄2 (6.4 to 12.7), incl 95 000 (655) 45 000 (310) 20
Over ⁄2 to 3 (12.7 to 76.2), incl 90 000 (620) 40 000 (275) 25
Over 3 (76.2) 85 000 (585) 35 000 (240) 30
Squares, hexagons, and rectangles:
All sizes 85 000 (585) 35 000 (240) 20
B
Rings and disks — — —
Cold-worked (annealed) or hot-worked (annealed):
A
Rods and bars, all sizes 80 000 (550) 35 000 (240) 30
C
Rings and disks — — —
Forging Quality:
D D D
All sizes
UNS N06601:
Cold-worked (annealed) or hot-worked (annealed):
All products, all sizes 80 000 (550) 30 000 (205) 30
D D D
Forging Quality:
UNS N06617:
Cold-worked (annealed) or hot-worked (annealed):
All products, all sizes 95 000 (655) 35 000 (240) 35
D D D
Forging Quality:
UNS N06674
E
Cold-worked (annealed ) or hot-worked 86 000 (590) 34 000 (235) 30
E
(annealed )
All products, all sizes
D D D
Forging Quality:
UNS N06690:
Cold-worked (as worked):
Rounds:
1 A
Under ⁄2 (12.7) 120 000 (825) 90 000 (620) 7
⁄2 to 1 (12.7 to 25.4), incl 110 000 (760) 85 000 (585) 10
Over 1 to 2 ⁄2 (25.4 to 63.5), incl 105 000 (725) 80 000 (550) 12
Squares, hexagons, and rectangles:
A
⁄4 (6.4) and under 100 000 (690) 80 000 (550) 5
1 1 7
Over ⁄4 to ⁄2 (6.4 to 12.7), excl 95 000 (655) 70 000 (480)
Hot worked (as worked):
Rounds:
1 1
⁄4 to ⁄2 (6.4 to 12.7), incl 95 000 (655) 45 000 (310) 20
Over ⁄2 to 3 (12.7 to 76.2), incl 90 000 (620) 40 000 (275) 25
Over 3 (76.2) 85 000 (585) 35 000 (240) 30
Squares, hexagons, and rectangles:
All sizes 85 000 (585) 35 000 (240) 20
B
Rings and disks — — —
Cold-worked (annealed) or hot-worked (annealed):
A
Rods and bars, all sizes 85 000 (586) 35 000 (240) 30
C
Rings and disks — — —
Forging Quality:
D D D
All sizes
UNS N06693:
Cold-worked (annealed) or hot-worked (annealed):
Rods and bars, all sizes 100 000 (690) 50 000 (345) 30
D D D
Forging Quality:
All sizes
UNS N06603:
Cold-worked (annealed) or hot-worked (annealed):
All products, all sizes 94 000 (650) 43 000 (300) 25
Forging Quality:
D D D
All sizes
UNS N06025:
Cold-worked (annealed) or hot-worked (annealed):
All products, all sizes 98 000 (680) 39 000 (270) 30
D D D
Forging Quality:
All sizes
UNS N06045:
Cold-worked (annealed) or hot-worked (annealed):
B166 − 24
TABLE 2 Continued
Condition and Diameter or Distance Tensile Strength, Yield Strength (0.2 % Elongation in 2 in. or
Between Parallel Surfaces, in. (mm) min, psi (MPa) offset), min, psi (MPa) 50 mm or 4D, min,%
All products, all sizes 90 000 (620) 35 000 (240) 35
F
Hot-worked (Annealed):
Rods and bars, all sizes 75 000 (517) 30 000 (207) 30
D D D
Forging Quality:
All sizes
UNS N06696
Cold-worked (annealed and water quenched) or 85 000 (586) 35 000 (240) 30
hot-worked (annealed and water quenched)
All products, all sizes
UNS N06699:
Cold-worked (annealed) or hot-worked (annealed): 89 000 (610) 35 000 (240) 40
All products, all sizes
D D D
Forging Quality:
All sizes
UNS N06235
Cold-worked (annealed) or hot-worked (annealed): 90 000 (620) 35 000 (240) 35
All products, all sizes
D D D
Forging Quality:
All sizes
A
Not applicable to diameters or cross sections under ⁄32 in. (2.4 mm).
B
Hardness B75 to B100, or equivalent.
C
Hardness B75 to B95, or equivalent.
D
Forging quality is furnished to chemical requirements and surface inspection only. No mechanical properties are required.
E
Solution annealed at a minimum temperature of 2150 °F (1175 °C) followed by a water quench or rapidly cooled by other means.
F
High-temperature annealed condition.
A
TABLE 3 Mechanical Properties of Cold-Worked Wire in Coil (Alloys N06600 and N06690 Only)
Tensile Strength, psi (MPa)
Condition and Size, in, (mm) Wrapping Test
Min Max
Annealed
Under 0.032 (0.81) 80 000 (552) 115 000 (793) The wire shall be wrapped eight consecutive
turns in a closed helix (pitch approximately
equal to the diameter of the wire) around a
mandrel as follows:
0.032 (0.81) and over 80 000 (552) 105 000 (724) (1) For all annealed and regular temper wire
and for spring temper wire 0.229 in. (5.82
mm) and less: Same as diameter of wire.
Cold-worked, regular temper, all sizes 120 000 (827) 165 000 (1138) (2) For spring temper wire over 0.229 in.
(5.82 mm): Twice the diameter of wire.
Cold-worked, spring temper . The wire shall withstand the wrapping test
without fracture or development of a pebbled
or orange-peel surface.
Up to 0.057 (1.45), incl 185 000 (1276) .
Over 0.057 (1.45) to 0.114 (2.90), incl 175 000 (1207) .
Over 0.114 (2.90) to 0.229 (5.82), incl 170 000 (1172) .
Over 0.229 (5.82) to 0.329 (8.36), incl 165 000 (1138) .
Over 0.329 (8.36) to 0.375 (9.53), incl 160 000 (1103) .
Over 0.375 (9.53) to 0.500 (12.7), incl 155 000 (1069) .
Over 0.500 (12.7) to 0.563 (14.3), incl 140 000 (965) .
A
Properties are not applicable to wire after straightening and cutting.
9. Sampling 9.2.1.1 Product (check) analysis shall be wholly the respon-
sibility of the purchaser.
9.1 Lot—Definition:
9.2.2 Mechanical Properties and Other Requirements—
9.1.1 A lot for chemical analysis shall consist of one heat.
Samples of the material to provide test specimens for mechani-
9.1.2 A lot for mechanical properties testing and other
cal properties and other requirements shall be taken from such
requirements shall consist of all material from the same heat,
locations in each lot as to be representative of that lot.
nominal diameter or thickness, and condition.
9.1.2.1 Where material cannot
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B166 − 19 B166 − 24
Standard Specification for
Nickel-Chromium-Aluminum Alloy, Nickel-Chromium-Iron
Alloys, Nickel-Chromium-Cobalt-Molybdenum Alloy, Nickel-
Iron-Chromium-Tungsten Alloy, and Nickel-Chromium-
Molybdenum-Copper Alloy Rod, Bar, and Wire
This standard is issued under the fixed designation B166; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
2 3
1.1 This specification covers nickel-chromium-aluminum alloy, nickel-chromium-iron alloys, nickel-chromium-cobalt-
molybdenum alloy, nickel-iron-chromium-tungsten alloy, and nickel-chromim-molybdenum-copper alloy in the form of hot-
finished and cold-worked rounds, squares, hexagons, rectangles, and cold-worked wire.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.3 The following precautionary caveat pertains only to the test methods portion, Section 12, of this specification: This standard
does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this
standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this
product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices and
determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
B168 Specification for Nickel-Chromium-Aluminum Alloys (UNS N06699), Nickel-Chromium-Iron Alloys (UNS N06600,
N06601, N06603, N06690, N06693, N06025, N06045, and N06696), Nickel-Chromium-Cobalt-Molybdenum Alloy (UNS
N06617), Nickel-Iron-Chromium-Tungsten Alloy (UNS N06674), and
B880 Specification for General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys and Cobalt Alloys
B899 Terminology Relating to Non-ferrous Metals and Alloys
E8/E8M Test Methods for Tension Testing of Metallic Materials
This specification is under the jurisdiction of ASTM Committee B02 on Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee B02.07 on Refined
Nickel and Cobalt and Their Alloys.
Current edition approved April 1, 2019April 1, 2024. Published May 2019April 2024. Originally approved in 1941. Last previous edition approved in 20182019 as
B166 – 18.B166 – 19. DOI: 10.1520/B0166-18.10.1520/B0166-24.
For ASME Boiler and Pressure Vessel Code application see related Specification SB-166 in Section II of that Code.
Designation established in accordance with Practice E527 and SAE J1086, Practice for Numbering Metals and Alloys (UNS).
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B166 − 24
E18 Test Methods for Rockwell Hardness of Metallic Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E38 Methods for Chemical Analysis of Nickel-Chromium and Nickel-Chromium-Iron Alloys (Withdrawn 1989)
E112 Test Methods for Determining Average Grain Size
E140 Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness,
Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
E1473 Test Methods for Chemical Analysis of Nickel, Cobalt, and High-Temperature Alloys
2.2 Federal Standards:
Fed. Std. No. 102 Preservation, Packaging and Packing Levels
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
Fed. Std. No. 182 Continuous Identification Marking of Nickel and Nickel-Base Alloys
2.3 Military Standard:
MIL-STD-129 Marking for Shipment and Storage
3. Terminology
3.1 For definitions of terms used in this specification, refer to Terminology B899.
3.2 In case of conflict between the definitions of this specification and Terminology B899, this specification shall prevail.
3.3 Definitions of Terms Specific to This Standard:
3.3.1 bar, n—material of rectangular (flats), hexagonal, or square solid section up to and including 10 in. (254 mm) in width and
⁄8 in. (3.2 mm) and over in thickness in straight lengths.
3.3.2 rod, n—material of round solid section furnished in straight lengths.
3.3.2.1 Discussion—
Hot-worked rectangular bar in widths 10 in. and under may be furnished as hot-rolled plate with sheared or cut edges in accordance
with Specification B168, provided the mechanical property requirements of this specification are met.
3.3.3 wire, n—a cold-worked solid product of uniform round cross section along its whole length, supplied in coil form.
4. Ordering Information
4.1 It is the responsibility of the purchaser to specify all requirements that are necessary for the safe and satisfactory performance
of material ordered under this specification. Examples of such requirements include, but are not limited to, the following:
4.1.1 Alloy Name or UNS Number—see Table 1,
4.1.2 ASTM Designation, including year of issue,
4.1.3 Section—Rod (round), bar (square, hexagonal, or rectangular), or wire (round),
4.1.4 Condition (see Table 2 and Table 3),
4.1.5 Finish,
4.1.6 Dimensions, including length (see Tables 4-8),
4.1.7 Quantity—feet or number of pieces,
4.1.8 Certification—State if certification is required,
4.1.8 Samples for Product (Check) Analysis—State whether samples for product (check) analysis shall be furnished, and
The last approved version of this historical standard is referenced on www.astm.org.
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://www.dodssp.daps.mil.
B166 − 24
A
TABLE 1 Chemical Requirements
Composition Limits, %
Element
Alloy Alloy Alloy Alloy Alloy Alloy Alloy Alloy Alloy Alloy Alloy Alloy
N06600 N06601 N06617 N06674 N06690 N06693 N06025 N06045 N06603 N06696 N06699 N06235
B B B B B B B
Nickel 72.0 min 58.0–63.0 44.5 min remainder 58.0 min remainder remainder 45.0 min remainder remainder remainder remainder
Chromium 14.0–17.0 21.0–25.0 20.0–24.0 21.5–24.5 27.0–31.0 27.0–31.0 24.0-26.0 26.0-29.0 24.0-26.0 28.0-32.0 26.0-30.0 30.0-32.5
Cobalt . . 10.0–15.0 . . . . . . . 1.0 max
Cobalt . . 10.0–15.0 . . . . . . . 1.0
Molybdenum . . 8.0–10.0 . . . . . . 1.0-3.0 . 5.0-6.2
B
Iron 6.0–10.0 remainder 3.0 max 20.0–27.0 7.0–11.0 2.5–6.0 8.0–11.0 21.0-25.0 8.0-11.0 2.0-6.0 2.5 max 1.5 max
B
Iron 6.0–10.0 remainder 3.0 20.0–27.0 7.0–11.0 2.5–6.0 8.0–11.0 21.0-25.0 8.0-11.0 2.0-6.0 2.5 1.5
Manganese 1.0 max 1.0 max 1.0 max 1.50 max 0.5 max 1.0 max 0.15 max 1.0 max 0.15 max 1.0 max 0.50 max 0.3-0.65
Manganese 1.0 1.0 1.0 1.50 0.5 1.0 0.15 1.0 0.15 1.0 0.50 0.3-0.65
Aluminum . 1.0–1.7 0.8–1.5 . . 2.5–4.0 1.8-2.4 . 2.4-3.0 . 1.9-3.0 0.2-0.4
Carbon 0.15 max 0.10 max 0.05–0.15 0.01 max 0.05 max 0.15 max 0.15-0.25 0.05-0.12 0.20-0.40 0.15 max 0.005-0.10 0.02-0.06
Carbon 0.15 0.10 0.05–0.15 0.01 0.05 max 0.15 0.15-0.25 0.05-0.12 0.20-0.40 0.15 0.005-0.10 0.02-0.06
Copper 0.5 max 1.0 max 0.5 max . 0.5 max 0.5 max 0.1 max 0.3 max 0.50 max 1.5-3.0 0.50 max 3.5-4.0
Copper 0.5 1.0 0.5 . 0.5 max 0.5 0.1 0.3 0.50 1.5-3.0 0.50 3.5-4.0
Silicon 0.5 max 0.5 max 1.0 max 1.0 max 0.5 max 0.5 max 0.5 max 2.5-3.0 0.50 max 1.0-2.5 0.50 max 0.2-0.6
Silicon 0.5 0.5 1.0 1.0 0.5 max 0.5 0.5 2.5-3.0 0.50 1.0-2.5 0.50 0.2-0.6
Sulfur 0.015 max 0.015 max 0.015 max 0.015 max 0.015 max 0.01 max 0.010 max 0.010 max 0.010 max 0.010 max 0.01 max 0.015 max
Sulfur 0.015 0.015 0.015 0.015 0.015 max 0.01 0.010 0.010 0.010 0.010 0.01 0.015
Titanium . . 0.6 max 0.05–0.20 . 1.0 max 0.1-0.2 . 0.01-0.25 1.0 max 0.60 max 0.5 max
Titanium . . 0.6 0.05–0.20 . 1.0 0.1-0.2 . 0.01-0.25 1.0 0.60 0.5
Phosphorus . . . 0.030 max . . 0.020 max 0.020 max 0.20 max . 0.02 max 0.03 max
Phosphorus . . . 0.030 . . 0.020 0.020 0.20 . 0.02 0.03
Zirconium . . . . . . 0.01-0.10 . 0.01-0.10 . 0.10 max .
Zirconium . . . . . . 0.01-0.10 . 0.01-0.10 . 0.10 .
Yttrium . . . . . . 0.05-0.12 . 0.01-0.15 . . .
Boron . . 0.006 max 0.0005–0.006 . . . . . . 0.008 max .
Boron . . 0.006 0.0005–0.006 . . . . . . 0.008 .
Nitrogen . . . 0.02 max . . . . . . 0.05 max .
Nitrogen . . . 0.02 . . . . . . 0.05 .
Niobium . . . 0.10–0.35 . 0.5–2.5 . . . . 0.50 max 1.0 max
Niobium . . . 0.10–0.35 . 0.5–2.5 . . . . 0.50 1.0
Cerium . . . . . . . 0.03-0.09 . . . .
Tungsten . . . 6.0–8.0 . . . . . . . 0.60 max
Tungsten . . . 6.0–8.0 . . . . . . . 0.60
A
Where ellipses (.) appear in this table, there is no requirement, and the element need neither be analyzed for nor reported. All values are maximums unless a range is provided or is a minimum or a remainder.
B
Element shall be determined arithmetically by difference.

B166 − 24
TABLE 2 Mechanical Properties of Rods and Bars
Condition and Diameter or Distance Tensile Strength, Yield Strength (0.2 % Elongation in 2 in. or
Between Parallel Surfaces, in. (mm) min, psi (MPa) offset), min, psi (MPa) 50 mm or 4D, min,%
UNS N06600:
Cold-worked (as worked):
Rounds:
A
Under ⁄2 (12.7) 120 000 (825) 90 000 (620) 7
⁄2 to 1 (12.7 to 25.4), incl 110 000 (760) 85 000 (585) 10
Over 1 to 2 ⁄2 (25.4 to 63.5), incl 105 000 (725) 80 000 (550) 12
Squares, hexagons, and rectangles:
A
⁄4 (6.4) and under 100 000 (690) 80 000 (550) 5
1 1
Over ⁄4 to ⁄2 (6.4 to 12.7), excl 95 000 (655) 70 000 (480)
Hot worked (as worked):
Rounds:
1 1
⁄4 to ⁄2 (6.4 to 12.7), incl 95 000 (655) 45 000 (310) 20
Over ⁄2 to 3 (12.7 to 76.2), incl 90 000 (620) 40 000 (275) 25
Over 3 (76.2) 85 000 (585) 35 000 (240) 30
Squares, hexagons, and rectangles:
All sizes 85 000 (585) 35 000 (240) 20
B
Rings and disks — — —
Cold-worked (annealed) or hot-worked (annealed):
A
Rods and bars, all sizes 80 000 (550) 35 000 (240) 30
C
Rings and disks — — —
Forging Quality:
D D D
All sizes
UNS N06601:
Cold-worked (annealed) or hot-worked (annealed):
All products, all sizes 80 000 (550) 30 000 (205) 30
D D D
Forging Quality:
UNS N06617:
Cold-worked (annealed) or hot-worked (annealed):
All products, all sizes 95 000 (655) 35 000 (240) 35
D D D
Forging Quality:
UNS N06674
E
Cold-worked (annealed ) or hot-worked 86 000 (590) 34 000 (235) 30
E
(annealed )
All products, all sizes
D D D
Forging Quality:
UNS N06690:
Cold-worked (as worked):
Rounds:
A
Under ⁄2 (12.7) 120 000 (825) 90 000 (620) 7
⁄2 to 1 (12.7 to 25.4), incl 110 000 (760) 85 000 (585) 10
Over 1 to 2 ⁄2 (25.4 to 63.5), incl 105 000 (725) 80 000 (550) 12
Squares, hexagons, and rectangles:
A
⁄4 (6.4) and under 100 000 (690) 80 000 (550) 5
1 1
Over ⁄4 to ⁄2 (6.4 to 12.7), excl 95 000 (655) 70 000 (480)
Hot worked (as worked):
Rounds:
1 1
⁄4 to ⁄2 (6.4 to 12.7), incl 95 000 (655) 45 000 (310) 20
Over ⁄2 to 3 (12.7 to 76.2), incl 90 000 (620) 40 000 (275) 25
Over 3 (76.2) 85 000 (585) 35 000 (240) 30
Squares, hexagons, and rectangles:
All sizes 85 000 (585) 35 000 (240) 20
B
Rings and disks — — —
Cold-worked (annealed) or hot-worked (annealed):
A
Rods and bars, all sizes 85 000 (586) 35 000 (240) 30
C
Rings and disks — — —
Forging Quality:
D D D
All sizes
UNS N06693:
Cold-worked (annealed) or hot-worked (annealed):
Rods and bars, all sizes 100 000 (690) 50 000 (345) 30
D D D
Forging Quality:
All sizes
UNS N06603:
Cold-worked (annealed) or hot-worked (annealed):
All products, all sizes 94 000 (650) 43 000 (300) 25
Forging Quality:
D D D
All sizes
UNS N06025:
Cold-worked (annealed) or hot-worked (annealed):
All products, all sizes 98 000 (680) 39 000 (270) 30
D D D
Forging Quality:
All sizes
UNS N06045:
Cold-worked (annealed) or hot-worked (annealed):
B166 − 24
TABLE 2 Continued
Condition and Diameter or Distance Tensile Strength, Yield Strength (0.2 % Elongation in 2 in. or
Between Parallel Surfaces, in. (mm) min, psi (MPa) offset), min, psi (MPa) 50 mm or 4D, min,%
All products, all sizes 90 000 (620) 35 000 (240) 35
F
Hot-worked (Annealed):
Rods and bars, all sizes 75 000 (517) 30 000 (207) 30
D D D
Forging Quality:
All sizes
UNS N06696
Cold-worked (annealed and water quenched) or 85 000 (586) 35 000 (240) 30
hot-worked (annealed and water quenched)
All products, all sizes
UNS N06699:
Cold-worked (annealed) or hot-worked (annealed): 89 000 (610) 35 000 (240) 40
All products, all sizes
D D D
Forging Quality:
All sizes
UNS N06235
Cold-worked (annealed) or hot-worked (annealed): 90 000 (620) 35 000 (240) 35
All products, all sizes
D D D
Forging Quality:
All sizes
A 3
Not applicable to diameters or cross sections under ⁄32 in. (2.4 mm).
B
Hardness B75 to B100, or equivalent.
C
Hardness B75 to B95, or equivalent.
D
Forging quality is furnished to chemical requirements and surface inspection only. No mechanical properties are required.
E
Solution annealed at a minimum temperature of 2150°F (1175°C)2150 °F (1175 °C) followed by a water quench or rapidly cooled by other means.
F
High-temperature annealed condition.
A
TABLE 3 Mechanical Properties of Cold-Worked Wire in Coil (Alloys N06600 and N06690 Only)
Tensile Strength, psi (MPa)
Condition and Size, in, (mm) Wrapping Test
Min Max
Annealed
Under 0.032 (0.81) 80 000 (552) 115 000 (793) The wire shall be wrapped eight consecutive
turns in a closed helix (pitch approximately
equal to the diameter of the wire) around a
mandrel as follows:
0.032 (0.81) and over 80 000 (552) 105 000 (724) (1) For all annealed and regular temper wire
and for spring temper wire 0.229 in. (5.82
mm) and less: Same as diameter of wire.
Cold-worked, regular temper, all sizes 120 000 (827) 165 000 (1138) (2) For spring temper wire over 0.229 in.
(5.82 mm): Twice the diameter of wire.
Cold-worked, spring temper 165 000 (1138) The wire shall withstand the wrapping test
without fracture or development of a pebbled
or orange-peel surface.
Cold-worked, spring temper . The wire shall withstand the wrapping test
without fracture or development of a pebbled
or orange-peel surface.
Up to 0.057 (1.45), incl 185 000 (1276) .
Over 0.057 (1.45) to 0.114 (2.90), incl 175 000 (1207) .
Over 0.114 (2.90) to 0.229 (5.82), incl 170 000 (1172) .
Over 0.229 (5.82) to 0.329 (8.36), incl 165 000 (1138) .
Over 0.329 (8.36) to 0.375 (9.53), incl 160 000 (1103) .
Over 0.375 (9.53) to 0.500 (12.7), incl 155 000 (1069) .
Over 0.500 (12.7) to 0.563 (14.3), incl 140 000 (965) .
A
Properties are not applicable to wire after straightening and cutting.
4.1.9 Purchaser Inspection—If purchaser wishes to witness tests or inspection of material at place of manufacture, the purchase
order must so state indicating which test or inspections are to be witnessed.
5. Chemical Composition
5.1 The material shall conform to the composition limits specified in Table 1.
5.2 If a product (check) analysis is performed by the purchaser, the material shall conform to the product (check) analysis
variations in Specification B880.
B166 − 24
TABLE 4 Permissible Variations in Diameter or Distance Between
Parallel Surfaces of Cold-Worked Rod and Bar
Permissible Variations From Specified
A
Dimension, in. (mm)
Specified Dimension, in. (mm)
+ −
Rounds:
1 3
⁄16 (1.6) to ⁄16 (4.8), excl 0 0.002 (0.05)
3 1
⁄16 (4.8) to ⁄2 (12.7), excl 0 0.003 (0.08)
1 15
⁄2 (12.7) to ⁄16 (23.8), incl 0.001 (0.03) 0.002 (0.05)
15 15
over ⁄16 (23.8) to 1 ⁄16 (49.2), 0.0015 (0.04) 0.003 (0.08)
incl
15 15
over ⁄16 (23.8) to 1 ⁄16 (49.2), 0.0015 (0.04) 0.003 (0.08)
incl
15 1
over 1 ⁄16 (49.2) to 2 ⁄2 (63.5), 0.002 (0.05) 0.004 (0.10)
incl
15 1
over 1 ⁄16 (49.2) to 2 ⁄2 (63.5), 0.002 (0.05) 0.004 (0.10)
incl
Hexagons, squares, rectangles:
⁄2 (12.7) and less 0 0.004 (0.10)
1 7
over ⁄2 (12.7) to ⁄8 (22.2), incl 0 0.005 (0.13)
7 1
over ⁄8 (22.2) to 1 ⁄4 (31.8), incl 0 0.007 (0.18)
over 1 ⁄4 (31.8) to 2 (50.8), incl 0 0.009 (0.23)
A
Dimensions apply to diameter of rounds, to distance between parallel surfaces of
hexagons and squares, and separately to width and thickness of rectangles.
TABLE 5 Permissible Variations in Diameter or Distance Between
Parallel Surfaces of Hot-Worked Rod and Bar
Permissible Variations from Specified
A
Dimensions, in. (mm)
Specified Dimension, in. (mm)
+ −
Rod and bar, hot-worked:
1 (25.4) and under 0.016 (0.41) 0.016 (0.41)
over 1 (25.4) to 2 (50.8), incl 0.031 (0.79) 0.016 (0.41)
over 2 (50.8) to 4 (101.6), incl 0.047 (1.19) 0.031 (0.79)
over 4 (101.6) 0.125 (3.18) 0.063 (1.60)
Rod, rough-turned or ground:
under 1 (25.4) 0.005 (0.13) 0.005 (0.13)
1 (25.4) and over 0.031 (0.79) 0
B
Forging quality rod:
Under 1 (25.4) 0.005 (0.13) 0.005 (0.13)
1 (25.4) and over 0.031 (0.79) 0
A
Dimensions apply to diameter of rods, to distance between parallel surfaces of
hexagons and squares, and separately to width and thickness of rectangles.
B
Spot grinding is permitted to remove minor surface imperfections. The depth of
these spot ground areas shall not exceed 3 % of the diameter of the rod.
TABLE 6 Permissible Variations in Diameter of Cold-Worked Wire
Permissible Variations, in.
Diameter, in. (mm) (mm)
+ or −
Up to 0.0044 (0.112), incl 0.0002 (0.005)
Over 0.0044 (0.112) to 0.0079 (0.201), 0.00025 (0.006)
incl
Over 0.0079 (0.201) to 0.0149 (0.378), 0.0003 (0.008)
incl
Over 0.0149 (0.378) to 0.0199 (0.505), 0.0004 (0.010)
incl
Over 0.0199 (0.505) to 0.031 (0.79), 0.0005 (0.013)
incl
Over 0.031 (0.79) to 0.045 (1.14), incl 0.0006 (0.015)
Over 0.045 (1.14) to 0.079 (2.01), incl 0.0007 (0.018)
Over 0.079 (2.01) to 0.1875 (4.76), incl 0.001 (0.025)
Over 0.1875 (4.76) to 0.3125 (7.93), 0.002 (0.051)
incl
Over 0.3125 (7.93) to 0.563 (14.3), incl 0.003 (0.076)
B166
...