ASTM F836M-02(2015)

Standard Specification for Style 1 Stainless Steel Metric Nuts (Metric)

ABSTRACT
This specification covers the chemical and mechanical requirements for style 1 stainless steel metric nuts. Groups and property classes of austenitic, ferritic, martensitic, and precipitation hardening stainless steel alloys are covered. Materials shall be cold-formed, hot-formed, or machined form, and shall conform to chemical, mechanical, dimensional and surface finish properties. Stainless steel shall also conform to heat treatment requirements depending on material grade. The material shall be capable of passing chemical, mechanical, and corrosion resistance tests in accordance to the specification. Product marking and packaging shall conform to the requirements of the specification.
SCOPE
1.1 This specification covers the chemical and mechanical requirements for stainless steel metric nuts with nominal thread diameters M1.6 through M36 and intended for use in engineering applications requiring general corrosion resistance.  
1.2 Eight groups of stainless steel alloys are covered, including three austenitic (Grades A1, A2, and A4), one ferritic (Grade F1), three martensitic (Grades C1, C3, and C4), and one precipitation hardening (Grade P1).  
1.3 Seventeen property classes are covered, including nine austenitic, one ferritic, six martensitic, and one precipitation hardening. The property classes with the permissible alloys for each are listed in Table 1.  (A) When approved by the purchaser, Alloys 303, 303Se, or XM1 may be furnished.(B) When approved by the purchaser, Alloy 430F may be furnished.  
1.4 This specification is based in concept and content on ISO 3506. The chemical and mechanical requirements specified for all property classes, except as given in 1.4.1, are essentially identical with classes of the same designation in ISO 3506.  
1.4.1 This specification includes 13 of the 16 property classes covered in ISO 3506. Additionally, it includes property classes A1-70, A2–70, A4–70, A1–80, A2–80, and A4–80 for products with nominal thread diameters larger than M20; and four non-ISO property classes, C1-110, C4-110, C3-120, and P1-90.  
1.5 Supplementary requirements of an optional nature are provided, applicable only when agreed upon between the manufacturer and the purchaser at the time of the inquiry and order.  
1.6 Suitable bolts, hex cap screws, and studs for use with nuts included in this specification are covered by Specification F738M. Unless otherwise specified, all bolts, hex cap screws, and studs used with these nuts shall conform to the requirements of Specification F738M and shall be of the same alloy group.  
1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

General Information

• Status: Historical
• Publication Date: 31-Aug-2015
• ICS: 21.060.20 - Nuts
• Technical Committee: F16 - Fasteners
• Drafting Committee: F16.04 - Nonferrous Fasteners

Relations

• Replaces: ASTM F836M-02(2010) - Standard Specification for Style 1 Stainless Steel Metric Nuts
• Effective Date: 01-Sep-2015
• Replaced By: ASTM F836M-16 - Standard Specification for Style 1 Stainless Steel Metric Nuts (Metric)
• Effective Date: 01-May-2016
• Referred By: ASTM B745/B745M-15(2021) - Standard Specification for Corrugated Aluminum Pipe for Sewers and Drains
• Effective Date: 01-Sep-2015
• Referred By: ASTM B746/B746M-22 - Standard Specification for Corrugated Aluminum Alloy Structural Plate for Field-Bolted Pipe, Pipe-Arches, and Arches
• Effective Date: 01-Sep-2015

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F836M −02(Reapproved 2015)
Standard Specification for
Style 1 Stainless Steel Metric Nuts (Metric)
This standard is issued under the fixed designation F836M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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 1.7 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
1.1 This specification covers the chemical and mechanical
standard.
requirementsforstainlesssteelmetricnutswithnominalthread
diametersM1.6throughM36andintendedforuseinengineer-
2. Referenced Documents
ing applications requiring general corrosion resistance.
2.1 ASTM Standards:
1.2 Eight groups of stainless steel alloys are covered,
A262Practices for Detecting Susceptibility to Intergranular
includingthreeaustenitic(GradesA1,A2,andA4),oneferritic
Attack in Austenitic Stainless Steels
(GradeF1),threemartensitic(GradesC1,C3,andC4),andone
A342/A342MTest Methods for Permeability of Weakly
precipitation hardening (Grade P1).
Magnetic Materials
1.3 Seventeen property classes are covered, including nine
A380Practice for Cleaning, Descaling, and Passivation of
austenitic, one ferritic, six martensitic, and one precipitation
Stainless Steel Parts, Equipment, and Systems
hardening.Thepropertyclasseswiththepermissiblealloysfor
A493Specification for Stainless Steel Wire and Wire Rods
each are listed in Table 1. for Cold Heading and Cold Forging
A555/A555MSpecification for General Requirements for
1.4 This specification is based in concept and content on
Stainless Steel Wire and Wire Rods
ISO 3506. The chemical and mechanical requirements speci-
A564/A564M Specification for Hot-Rolled and Cold-
fied for all property classes, except as given in 1.4.1, are
Finished Age-Hardening Stainless Steel Bars and Shapes
essentially identical with classes of the same designation in
A582/A582MSpecification for Free-Machining Stainless
ISO 3506.
Steel Bars
1.4.1 This specification includes 13 of the 16 property
A751Test Methods, Practices, and Terminology for Chemi-
classes covered in ISO 3506.Additionally, it includes property
cal Analysis of Steel Products
classes A1-70, A2–70, A4–70, A1–80, A2–80, and A4–80 for
D3951Practice for Commercial Packaging
products with nominal thread diameters larger than M20; and
E29Practice for Using Significant Digits in Test Data to
four non-ISO property classes, C1-110, C4-110, C3-120, and
Determine Conformance with Specifications
P1-90.
F606MTest Methods for Determining the Mechanical Prop-
1.5 Supplementary requirements of an optional nature are
erties of Externally and Internally Threaded Fasteners,
provided, applicable only when agreed upon between the
Washers, and Rivets (Metric)
manufacturer and the purchaser at the time of the inquiry and
F738M Specification for Stainless Steel Metric Bolts,
order. 3
Screws, and Studs (Withdrawn 2014)
1.6 Suitable bolts, hex cap screws, and studs for use with
F1470Practice for Fastener Sampling for Specified Me-
nuts included in this specification are covered by Specification chanical Properties and Performance Inspection
F738M. Unless otherwise specified, all bolts, hex cap screws,
2.2 ISO Standard:
and studs used with these nuts shall conform to the require-
ISO3506 Corrosion-Resistant Stainless Steel Fasteners
ments of Specification F738M and shall be of the same alloy
group.
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
This specification is under the jurisdiction of ASTM Committee F16 on the ASTM website.
Fastenersand is the direct responsibility of Subcommittee F16.04 on Nonferrous The last approved version of this historical standard is referenced on
Fasteners. www.astm.org.
Current edition approved Sept. 1, 2015. Published November 2015. Originally Available from American Society of Mechanical Engineers (ASME), ASME
approvedin1983.Lastpreviouseditionapprovedin2010asF536–02(2010).DOI: International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
10.1520/F0836M-02R15. www.asme.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F836M−02 (2015)
TABLE 1 Property Classes of Stainless Steel Nuts
4.1.1 Quantity (number of pieces of each item);
Property Class Permissible Alloys
4.1.2 Name of item (specific type and style, and references
A
A1-50 304, 304L, 305
to dimensional standard when appropriate);
A1-70 384, 18–9LW, 302HQ
4.1.3 Size (nominal diameter, thread pitch);
A1-80
4.1.4 Property class;
A2-50
4.1.5 Supplementary requirements, if any (S1 through S3).
A2-70 321, 347
4.1.6 Orders for nuts under this specification may include
A2-80
the following optional requirements:
A4-50
4.1.6.1 Forming (5.1);
A4-70 316, 316L
A4-80
4.1.6.2 Alloy condition (5.2);
B 4.1.6.3 Alloy selection (7.2.1 and S2);
F1-45 430
4.1.6.4 Test report (15.2);
C1-70 410
4.1.6.5 Additional testing (11.3);
C1-110
4.1.6.6 Corrosion resistance testing (11.2);
C3-80 431
4.1.6.7 Inspection (13.1);
C3-120
4.1.6.8 Heat number (11.1.1);
C4-70 416, 416Se
4.1.6.9 Certification (15.1);
C4-110
4.1.6.10 Proof load testing (9.2).
P1-90 630
4.1.7 ASTM specification and date of issue. When date of
A
When approved by the purchaser, Alloys 303, 303Se, or XM1 may be furnished.
issueisnotspecified,nutsshallbefurnishedtothelatestissue.
B
When approved by the purchaser, Alloy 430F may be furnished.
NOTE 2—Example: 10000 pieces, hex nut, ASME B18.2.4.1M, M6 ×
1, Class A2-70, furnish test report, ASTM F836M–XX.
15000 pieces, Hex Flange Nuts, ASME B18.2.4.4M, M8 × 1.25,
2.3 ASME Standards:
class A4-50, Supplementary Requirement S3, ASTM F836–XX.
ASME B1.13MMetric Screw Threads—M Profile
ASME B18.2.4.1M Metric Hex Nuts, Style 1
5. Materials and Manufacture
NOTE 1—The following ASTM standards are noted for information
5.1 Forming—Unless otherwise specified, nuts shall be
only as suitable sources of material for the manufacture of nuts to this
cold-formed, hot-formed, or machined, at the option of the
specification: Specifications A493, A564/A564M, and A582/A582M.
manufacturer.
3. Classification
5.2 Condition—Nuts shall be furnished in the condition
3.1 The designation of each property class is comprised of
specified for the property class in Table 2. If other conditions
three parts, a letter followed by a single digit, followed by
are required, the condition and resultant mechanical properties
either two or three digits (see Table 1).
shall be as agreed upon between the manufacturer and the
3.1.1 The letter indicates the general composition type of
purchaser.
stainless steel:
5.3 Surface Finish—Unless otherwise specified, nuts shall
3.1.1.1 A for austenitic steels,
be cleaned and descaled in accordance with Practice A380.
3.1.1.2 F for ferritic steels,
3.1.1.3 C for martensitic steels, and
6. Heat Treatment
3.1.1.4 P for precipitation-hardening steel.
3.1.2 The first digit (1, 2, 3, or 4) indicates the alloy group. 6.1 Austenitic Alloys, Grades A1, A2, and A4:
The permissible alloys within each group are given in Table 1.
6.1.1 When Condition A is specified, the nuts shall be
3.1.3 The last two or three digits (50, 70, 110, etc.) indicate
machined from annealed or solution annealed stock, thus
10%ofthespecifiednutproofloadstressofthepropertyclass.
retaining the properties of the original material, or hot formed
3.1.4 For example, ClassA1-50 is an austenitic steel of any
and solution annealed.
one of six permitted alloys, and the manufactured nut has a
6.1.2 When Condition AF is specified, the nuts, following
proof load stress of 500 MPa.
manufacture, shall be annealed by heating to 1040 6 30°C, at
which time the chromium carbide will go into solution. The
nuts shall be held for a sufficient time and then cooled at a rate
sufficient to prevent precipitation of the carbide and to provide
the properties specified in Table 2.
6.1.3 When Condition CW is specified, the austenitic alloy
shallbeannealedasspecifiedin6.1.1,andthencold-workedto
develop the properties specified in Table 2.
6.1.4 When Condition SH is specified, nuts shall be ma-
4. Ordering Information
chined from strain hardened stock.
4.1 Orders for nuts under this specification shall include the
following : 6.2 Ferritic Alloys, Grade F1:
F836M−02 (2015)
TABLE 2 Mechanical Property Requirements
Hardness
Alloy/Mechanical Nominal Thread Proof Load
A
Property Class Condition Vickers Rockwell
Property Marking Diameter Stress, MPa
min max min max
A1-50 F836A
A2-50 A or AF F836B M1.6 to M36 500 155 220 B81 B95
A4-50 F836C
A1-70 F836D M1.6 to M20 700 220 330 B96 C33
A2-70 CW F836E over M20 to M36 550 160 310 B83 C31
A4-70 F836F
A1-80 F836G M1.6 to M20 800 240 350 C23 C36
A2-80 SH F836H over M20 to M24 700 220 330 B96 C33
A4-80 F836J over M24 to M30 650 200 310 B93 C30
over M30 to M36 600 180 285 B89 C28
F1-45 A or AF F836K M1.6 to M36 450 135 220 B74 B96
C1-70 F836L
H M1.6 to M36 700 220 330 B96 C34
C4-70 F836M
C1-110 F836N
HT 1100 350 440 C36 C45
C4-110 F836P M1.6 to M36
C3-80 H F836R M1.6 to M36 800 240 340 C23 C35
C3-120 HT F836S M1.6 to M36 1200 380 480 C39 C48
P1-90 AH F836T M1.6 to M36 900 285 370 C28 C38
A
Legend of Conditions:
AF—formed and annealed.
CW—formed from annealed stock, thus acquiring a degree of cold work.
SH—machined from strain hardened stock.
A—machined from annealed or solution annealed stock, thus retaining the properties of the original material, or hot formed and solution annealed.
H—hardened and tempered at 565°C medium.
HT—hardened and tempered at 275°C minimum.
AH—solution annealed and age hardened after forming.
6.2.1 When ConditionAis specified, the ferritic alloy shall 7. Chemical Composition
be heated to a temperature of 790 6 30°C, held for an
7.1 It is the intent of this specification that nuts shall be
appropriate time, and then air-cooled to provide the properties
ordered by property class.
specified in Table 2.
6.2.2 When ConditionAF is specified, nuts shall be treated 7.2 Unless otherwise specified in the inquiry and purchase
as specified in 6.1.2. order(seeSupplementaryRequirementS2),whentwoormore
alloys are permitted for nuts of a specified property class, the
6.3 Martensitic Alloys, Grades C1, C3, and C4:
choice of alloy to be used shall be that of the fastener
6.3.1 When Condition H is specified, the nuts shall be
manufacturerasdeterminedbyhisnutfabricationmethodsand
hardened and tempered by heating to 1010 6 30°C sufficient
material availability. The specific alloy used by the manufac-
for austenitization, holding for at least 1 h and then air-cooling
turer shall be identified clearly on any certification required in
to provide the properties specified in Table 2.
the purchase order and shall have a chemical composition
6.3.2 When Condition HT is specified, the nuts shall be
conforming to the limits specified in Table 3.
hardened and tempered by heating to 1010 6 30°C sufficient
7.2.1 When the purchaser specifies that a specific alloy be
for austenitization, holding for at least ⁄2 h, rapid air- or
used, the alloy shall have a chemical composition conforming
oil-quenching,reheatingto275°Cminimum,andholdingforat
to the limits specified in Table 3.
least1handthenair-coolingtoprovidethepropertiesspecified
in Table 2.
7.3 Product analysis may be made by the purchaser from
nuts representing each lot. The chemical composition thus
6.4 Precipitation-Hardening Alloy, Grade P1—When Con-
determined shall conform to the limits specified in Table 3 for
ditionAH is specified, the nuts shall be solution-annealed and
1 the specific alloy within the product analysis tolerances speci-
agedbyheatingto1040 615°C,holdingforatleast ⁄2h,rapid
fied in Specification A555/A555M.
air- or oil-quenching to 27°C maximum, reheating to 620 6
10°C minimum, holding for 4 h, and then air-cooling to 7.3.1 In the event of discrepancy, a referee analysis of
provide the properties specified in Table 2. samples for each lot shall be made in accordance with 12.1.
F836M−02 (2015)
TABLE 3 Chemical Requirements
Composition, % maximum except as shown
UNS
Alloy
Alloy Desig-
Car- Manga- Phospho- Molyb-
Group
Sulfur Silicon Chromium Nickel Copper Others
nation
bon nese rus denum
Austenitic Alloys
A
A1 303 S30300 0.15 2.00 0.20 0.15 min 1.00 17.0 to 19.0 8.0 to 10.0 0.60 max
A1 303Se S30323 0.15 2.00 0.20 0.060 1.00 17.0 to 19.0 8.0 to 10.0 Se 0.15 min
A1 304 S30400 0.08 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 10.5 1.00
A1 304L S30403 0.03 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 12.0 1.00
A1 305 S30500 0.12 2.00 0.045 0.030 1.00 17.0 to 19.0 10.5 to 13.0 1.00
A1 384 S38400 0.08 2.00 0.045 0.030 1.00 15.0 to 17.0 17.0 to 19.0
A
A1 XM1 S20300 0.08 5.0 to 6.5 0.040 0.18 to 1.00 16.0 to 18.0 5.0 to 6.5 1.75 to 0.50 max
0.35 2.25
A1 18–9LW S30430 0.10 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.0 to 4.0
A1 302HQ S30433 0.03 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.0 to 4.0
A4 316 S31600 0.08 2.00 0.045 0.030 1.00 16.0 to 18.0 10.0 to 14.0 2.00–3.00
A4 316L S31603 0.03 2.00 0.045 0.030 1.00 16.0 to 18.0 10.0 to 14.0 2.00–3.00
A4 321 S32100 0.08 2.00 0.045 0.030 1.00 17.0 to 19.0 9.0 to 12.0 Ti 5 × C
min
A2 347 S34700 0.08 2.00 0.045 0.030 1.00 17.0 to 19.0 9.0 to 13.0 Cb + Ta
10×Cmin
Ferritic Alloys
F1 430 S43000 0.12 1.00 0.040 0.030 1.00 16.0 to 18.0
A
F1 430F S43020 0.12 1.25 0.060 0.15 min 1.00 16.0 to 18.0 0.60 max
Martensitic Alloys
C1 410 S41000 0.15 1.00 0.040 0.030 1.00 11.5 to 13.5
A
C4 416 S41600 0.15 1.25 0.060 0.15 min 1.00 12.0 to 14.0 0.60 max Se 0.15 min
416Se
C4 S41623 0.15 1.25 0.060 0.060 1.00 12.0 to 14.0
C3 431 S43100 0.20 1.00 0.040 0.030 1.00 15.0 to 17.0 1.25 to 2.50
Precipitation Hardening Alloy
P1 630 S17400 0.07 1.00 0.040 0.030 1.00 15.0 to 17.5 3.0 to 5.0 3.0 to 5.0 Cb + Ta
0.15–0.45
A
At manufacturer’s option, determined only when intentionally added.
8. Corrosion Resistance 9.2 Unless proof load testing is specified in the inquiry and
purchase order, nuts of all classes in nominal thread diameters
8.1 Carbide Precipitation:
M4andsmaller,andnutsofallclasseswithproofloadsgreater
8.1.1 Rod, bar, and wire in the austeniticAlloy GroupsA1,
than 530 kN, as specified in Table 4, shall be furnished on the
A2, andA4, except the free-machining grades, 303 and 303Se,
basisofhavingahardnessnotlessthantheminimumhardness
use
...

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: F836M − 02 (Reapproved 2010) F836M − 02 (Reapproved 2015)
Standard Specification for
Style 1 Stainless Steel Metric Nuts (Metric)
This standard is issued under the fixed designation F836M; 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
1.1 This specification covers the chemical and mechanical requirements for stainless steel metric nuts with nominal thread
diameters M1.6 through M36 and intended for use in engineering applications requiring general corrosion resistance.
1.2 Eight groups of stainless steel alloys are covered, including three austenitic (Grades A1, A2, and A4), one ferritic (Grade
F1), three martensitic (Grades C1, C3, and C4), and one precipitation hardening (Grade P1).
1.3 Seventeen property classes are covered, including nine austenitic, one ferritic, six martensitic, and one precipitation
hardening. The property classes with the permissible alloys for each are listed in Table 1.
1.4 This specification is based in concept and content on ISO 3506. The chemical and mechanical requirements specified for
all property classes, except as given in 1.4.1, are essentially identical with classes of the same designation in ISO 3506.
1.4.1 This specification includes 13 of the 16 property classes covered in ISO 3506. Additionally, it includes property classes
A1-70, A2–70, A4–70, A1–80, A2–80, and A4–80 for products with nominal thread diameters larger than M20; and four non-ISO
property classes, C1-110, C4-110, C3-120, and P1-90.
1.5 Supplementary requirements of an optional nature are provided, applicable only when agreed upon between the
manufacturer and the purchaser at the time of the inquiry and order.
1.6 Suitable bolts, hex cap screws, and studs for use with nuts included in this specification are covered by Specification F738M.
Unless otherwise specified, all bolts, hex cap screws, and studs used with these nuts shall conform to the requirements of
Specification F738M and shall be of the same alloy group.
1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
2. Referenced Documents
2.1 ASTM Standards:
A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
A342/A342M Test Methods for Permeability of Weakly Magnetic Materials
A380 Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems
A493 Specification for Stainless Steel Wire and Wire Rods for Cold Heading and Cold Forging
A555/A555M Specification for General Requirements for Stainless Steel Wire and Wire Rods
A564/A564M Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes
A582/A582M Specification for Free-Machining Stainless Steel Bars
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
D3951 Practice for Commercial Packaging
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, and
Rivets (Metric)
F738M Specification for Stainless Steel Metric Bolts, Screws, and Studs (Withdrawn 2014)
F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection
This specification is under the jurisdiction of ASTM Committee F16 on Fastenersand is the direct responsibility of Subcommittee F16.04 on Nonferrous Fasteners.
Current edition approved Oct. 1, 2010Sept. 1, 2015. Published January 2011November 2015. Originally approved in 1983. Last previous edition approved in 20022010
as F536 – 02.F536 – 02(2010). DOI: 10.1520/F0836M-02R10.10.1520/F0836M-02R15.
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.
The last approved version of this historical standard is referenced on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F836M − 02 (2015)
TABLE 1 Property Classes of Stainless Steel Nuts
Property Class Permissible Alloys
A
A1-50 304, 304L, 305
A1-70 384, 18–9LW, 302HQ
A1-80
A2-50
A2-70 321, 347
A2-80
A4-50
A4-70 316, 316L
A4-80
B
F1-45 430
C1-70 410
C1-110
C3-80 431
C3-120
C4-70 416, 416Se
C4-110
P1-90 630
A
When approved by the purchaser, Alloys 303, 303Se, or XM1 may be furnished.
B
When approved by the purchaser, Alloy 430F may be furnished.
2.2 ISO Standard:
ISO 3506 Corrosion-Resistant Stainless Steel Fasteners
2.3 ASME Standards:
ASME B1.13M Metric Screw Threads—M Profile
ASME B18.2.4.1M Metric Hex Nuts, Style 1
NOTE 1—The following ASTM standards are noted for information only as suitable sources of material for the manufacture of nuts to this specification:
Specifications A493, A564/A564M, and A582/A582M.
3. Classification
3.1 The designation of each property class is comprised of three parts, a letter followed by a single digit, followed by either two
or three digits (see Table 1).
3.1.1 The letter indicates the general composition type of stainless steel:
3.1.1.1 A for austenitic steels,
3.1.1.2 F for ferritic steels,
3.1.1.3 C for martensitic steels, and
3.1.1.4 P for precipitation-hardening steel.
3.1.2 The first digit (1, 2, 3, or 4) indicates the alloy group. The permissible alloys within each group are given in Table 1.
3.1.3 The last two or three digits (50, 70, 110, etc.) indicate 10 % of the specified nut proof load stress of the property class.
3.1.4 For example, Class A1-50 is an austenitic steel of any one of six permitted alloys, and the manufactured nut has a proof
load stress of 500 MPa.
4. Ordering Information
4.1 Orders for nuts under this specification shall include the following :
4.1.1 Quantity (number of pieces of each item);
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
www.asme.org.
F836M − 02 (2015)
4.1.2 Name of item (specific type and style, and references to dimensional standard when appropriate);
4.1.3 Size (nominal diameter, thread pitch);
4.1.4 Property class;
4.1.5 Supplementary requirements, if any (S1 through S3).
4.1.6 Orders for nuts under this specification may include the following optional requirements:
4.1.6.1 Forming (5.1);
4.1.6.2 Alloy condition (5.2);
4.1.6.3 Alloy selection (7.2.1 and S2);
4.1.6.4 Test report (15.2);
4.1.6.5 Additional testing (11.3);
4.1.6.6 Corrosion resistance testing (11.2);
4.1.6.7 Inspection (13.1);
4.1.6.8 Heat number (11.1.1);
4.1.6.9 Certification (15.1);
4.1.6.10 Proof load testing (9.2).
4.1.7 ASTM specification and date of issue. When date of issue is not specified, nuts shall be furnished to the latest issue.
NOTE 2—Example: 10 000 pieces, hex nut, ASME B18.2.4.1M, M6 × 1, Class A2-70, furnish test report, ASTM F836M – XX.
15 000 pieces, Hex Flange Nuts, ASME B18.2.4.4M, M8 × 1.25, class A4-50, Supplementary Requirement S3, ASTM F836 – XX.
5. Materials and Manufacture
5.1 Forming—Unless otherwise specified, nuts shall be cold-formed, hot-formed, or machined, at the option of the
manufacturer.
5.2 Condition—Nuts shall be furnished in the condition specified for the property class in Table 2. If other conditions are
required, the condition and resultant mechanical properties shall be as agreed upon between the manufacturer and the purchaser.
5.3 Surface Finish—Unless otherwise specified, nuts shall be cleaned and descaled in accordance with Practice A380.
TABLE 2 Mechanical Property Requirements
Hardness
Alloy/Mechanical Nominal Thread Proof Load
A
Property Class Condition Vickers Rockwell
Property Marking Diameter Stress, MPa
min max min max
A1-50 F836A
A2-50 A or AF F836B M1.6 to M36 500 155 220 B81 B95
A4-50 F836C
A1-70 F836D M1.6 to M20 700 220 330 B96 C33
A2-70 CW F836E over M20 to M36 550 160 310 B83 C31
A4-70 F836F
A1-80 F836G M1.6 to M20 800 240 350 C23 C36
A2-80 SH F836H over M20 to M24 700 220 330 B96 C33
A4-80 F836J over M24 to M30 650 200 310 B93 C30
over M30 to M36 600 180 285 B89 C28
F1-45 A or AF F836K M1.6 to M36 450 135 220 B74 B96
C1-70 F836L
H M1.6 to M36 700 220 330 B96 C34
C4-70 F836M
C1-110 F836N
HT 1100 350 440 C36 C45
C4-110 F836P M1.6 to M36
C3-80 H F836R M1.6 to M36 800 240 340 C23 C35
C3-120 HT F836S M1.6 to M36 1200 380 480 C39 C48
P1-90 AH F836T M1.6 to M36 900 285 370 C28 C38
A
Legend of Conditions:
AF—formed and annealed.
CW—formed from annealed stock, thus acquiring a degree of cold work.
SH—machined from strain hardened stock.
A—machined from annealed or solution annealed stock, thus retaining the properties of the original material, or hot formed and solution annealed.
H—hardened and tempered at 565°C medium.
HT—hardened and tempered at 275°C minimum.
AH—solution annealed and age hardened after forming.
F836M − 02 (2015)
6. Heat Treatment
6.1 Austenitic Alloys, Grades A1, A2, and A4:
6.1.1 When Condition A is specified, the nuts shall be machined from annealed or solution annealed stock, thus retaining the
properties of the original material, or hot formed and solution annealed.
6.1.2 When Condition AF is specified, the nuts, following manufacture, shall be annealed by heating to 1040 6 30°C, at which
time the chromium carbide will go into solution. The nuts shall be held for a sufficient time and then cooled at a rate sufficient
to prevent precipitation of the carbide and to provide the properties specified in Table 2.
6.1.3 When Condition CW is specified, the austenitic alloy shall be annealed as specified in 6.1.1, and then cold-worked to
develop the properties specified in Table 2.
6.1.4 When Condition SH is specified, nuts shall be machined from strain hardened stock.
6.2 Ferritic Alloys, Grade F1:
6.2.1 When Condition A is specified, the ferritic alloy shall be heated to a temperature of 790 6 30°C, held for an appropriate
time, and then air-cooled to provide the properties specified in Table 2.
6.2.2 When Condition AF is specified, nuts shall be treated as specified in 6.1.2.
6.3 Martensitic Alloys, Grades C1, C3, and C4:
6.3.1 When Condition H is specified, the nuts shall be hardened and tempered by heating to 1010 6 30°C sufficient for
austenitization, holding for at least 1 h and then air-cooling to provide the properties specified in Table 2.
6.3.2 When Condition HT is specified, the nuts shall be hardened and tempered by heating to 1010 6 30°C sufficient for
austenitization, holding for at least ⁄2 h, rapid air- or oil-quenching, reheating to 275°C minimum, and holding for at least 1 h and
then air-cooling to provide the properties specified in Table 2.
6.4 Precipitation-Hardening Alloy, Grade P1—When Condition AH is specified, the nuts shall be solution-annealed and aged
by heating to 1040 6 15°C, holding for at least ⁄2 h, rapid air- or oil-quenching to 27°C maximum, reheating to 620 6 10°C
minimum, holding for 4 h, and then air-cooling to provide the properties specified in Table 2.
7. Chemical Composition
7.1 It is the intent of this specification that nuts shall be ordered by property class.
7.2 Unless otherwise specified in the inquiry and purchase order (see Supplementary Requirement S2), when two or more alloys
are permitted for nuts of a specified property class, the choice of alloy to be used shall be that of the fastener manufacturer as
determined by his nut fabrication methods and material availability. The specific alloy used by the manufacturer shall be identified
clearly on any certification required in the purchase order and shall have a chemical composition conforming to the limits specified
in Table 3.
7.2.1 When the purchaser specifies that a specific alloy be used, the alloy shall have a chemical composition conforming to the
limits specified in Table 3.
7.3 Product analysis may be made by the purchaser from nuts representing each lot. The chemical composition thus determined
shall conform to the limits specified in Table 3 for the specific alloy within the product analysis tolerances specified in Specification
A555/A555M.
7.3.1 In the event of discrepancy, a referee analysis of samples for each lot shall be made in accordance with 12.1.
8. Corrosion Resistance
8.1 Carbide Precipitation:
8.1.1 Rod, bar, and wire in the austenitic Alloy Groups A1, A2, and A4, except the free-machining grades, 303 and 303Se, used
to make nuts in accordance with this specification, shall be capable of passing the test for susceptibility to intergranular corrosion
as specified in Practice E of Practices A262.
8.1.2 As stated in Practices A262, samples may be subjected to the faster and more severe screening test in accordance with
Practice A. Failing Practice A, specimens may be tested in accordance with Practice E and be considered satisfactory if passing
Practice E.
9. Mechanical Properties
9.1 The hardness of nuts of each class shall not exceed the maximum hardness specified for the class in Table 2. This shall be
the only hardness requirement for nuts that are proof load tested.
9.2 Unless proof load testing is specified in the inquiry and purchase order, nuts of all classes in nominal thread diameters M4
and smaller, and nuts of all classes with proof loads greater than 530 kN, as specified in Table 4, shall be furnished on the basis
of having a hardness not less than the minimum hardness specified in Table 2.
9.3 All classes of nuts, except those covered in 9.2 shall withstand the proof load as specified in Table 4.
F836M − 02 (2015)
TABLE 3 Chemical Requirements
Composition, % maximum except as shown
UNS
Alloy
Alloy Desig-
Car- Manga- Phospho- Molyb-
Group
Sulfur Silicon Chromium Nickel Copper Others
nation
bon nese rus denum
Austenitic Alloys
A
A1 303 S30300 0.15 2.00 0.20 0.15 min 1.00 17.0 to 19.0 8.0 to 10.0 0.60 max
A1 303Se S30323 0.15 2.00 0.20 0.060 1.00 17.0 to 19.0 8.0 to 10.0 Se 0.15 min
A1 304 S30400 0.08 2.00 0.045 0.030 1.00 18.0 to 20.0 8.
...