ASTM A194/A194M-05a

Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both

SCOPE
1.1 This specification covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range 1/4 through 4 in. and metric M6 through M100 nominal. It also covers austenitic stainless steel nuts in the size range 1/4 in. and M6 nominal and above. These nuts are intended for high-pressure or high-temperature service, or both. Grade substitutions without the purchaser's permission are not allowed.
1.2 Bars from which the nuts are made shall be hot-wrought. The material may be further processed by centerless grinding or by cold drawing. Austenitic stainless steel may be solution annealed or annealed and strain-hardened. When annealed and strain hardened austenitic stainless steel is ordered in accordance with Supplementary Requirement S1, the purchaser should take special care to ensure that 8.2.2, Supplementary Requirement S1, and Appendix X1 are thoroughly understood.
1.3 Supplementary requirements (S1 through S6) of an optional nature are provided. These shall apply only when specified in the inquiry, contract, and order.
1.4 This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable" M" specification designation (SI units), the material shall be furnished to inch-pound units.
1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

General Information

• Status: Historical
• Publication Date: 14-Sep-2005
• ICS: 21.060.20 - Nuts
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.22 - Steel Forgings and Wrought Fittings for Piping Applications and Bolting Materials for Piping and Special Purpose Applications

Relations

• Replaces: ASTM A194/A194M-05 - Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both
• Effective Date: 15-Sep-2005
• Replaced By: ASTM A194/A194M-05b - Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both
• Effective Date: 01-Dec-2005
• Referred By: ASTM F1155-10(2019) - Standard Practice for Selection and Application of Piping System Materials
• Effective Date: 15-Sep-2005
• Referred By: ASTM B994/B994M-22 - Standard Specification for Nickel-Cobalt Alloy Coating
• Effective Date: 15-Sep-2005
• Referred By: ASTM F1554-20 - Standard Specification for Anchor Bolts, Steel, 36, 55, and 105-ksi Yield Strength
• Effective Date: 15-Sep-2005
• Referred By: ASTM A193/A193M-23 - Standard Specification for Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications
• Effective Date: 15-Sep-2005
• Referred By: ASTM F2716-08(2020) - Standard Practice for Comparison of Nonmetallic Flat Gaskets in High Pressure Saturated Steam
• Effective Date: 15-Sep-2005
• Referred By: ASTM F1510-21 - Standard Specification for Rotary Positive Displacement Pumps, Ships Use
• Effective Date: 15-Sep-2005
• Referred By: ASTM F1565-00(2019) - Standard Specification for Pressure-Reducing Valves for Steam Service
• Effective Date: 15-Sep-2005
• Referred By: ASTM F998-12(2022) - Standard Specification for Centrifugal Pump, Shipboard Use
• Effective Date: 15-Sep-2005
• Referred By: ASTM F1476-07(2019) - Standard Specification for Performance of Gasketed Mechanical Couplings for Use in Piping Applications
• Effective Date: 15-Sep-2005
• Referred By: ASTM F1718-01(2019) - Standard Specification for Rotary Positive Displacement Distillate Fuel Pumps
• Effective Date: 15-Sep-2005
• Referred By: ASTM A320/A320M-22a - Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service
• Effective Date: 15-Sep-2005
• Referred By: ASTM F2798-09(2023) - Standard Specification for Sealless Lube Oil Pump with Oil Through Motor for Marine Applications
• Effective Date: 15-Sep-2005
• Referred By: ASTM F1508-96(2021) - Standard Specification for Angle Style, Pressure Relief Valves for Steam, Gas, and Liquid Services
• Effective Date: 15-Sep-2005

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
Endorsed by
Designation: A 194/A 194M – 05a Manufacturers Standardization Society
of the Valve and Fittings Industry
Used in USNRC-RDT Standards
Standard Specification for
Carbon and Alloy Steel Nuts for Bolts for High Pressure or
1
High Temperature Service, or Both
This standard is issued under the fixed designationA 194/A 194M; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* 2. Referenced Documents
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1.1 This specification covers a variety of carbon, alloy, and 2.1 ASTM Standards:
1
martensitic stainless steel nuts in the size range ⁄4 through 4 A 153/A 153M Specification for Zinc Coating (Hot-Dip) on
in. and metric M6 through M100 nominal. It also covers Iron and Steel Hardware
1
austenitic stainless steel nuts in the size range ⁄4 in. and M6 A 276 Specification for Stainless Steel Bars and Shapes
nominal and above. These nuts are intended for high-pressure A 320/A 320M Specification for Alloy-Steel Bolting Ma-
or high-temperature service, or both. Grade substitutions with- terials for Low-Temperature Service
out the purchaser’s permission are not allowed. A 370 Test Methods and Definitions for MechanicalTesting
1.2 Barsfromwhichthenutsaremadeshallbehot-wrought. of Steel Products
The material may be further processed by centerless grinding A 962/A 962M Specification for Common Requirements
or by cold drawing. Austenitic stainless steel may be solution forSteelFastenersorFastenerMaterials,orBoth,Intended
annealed or annealed and strain-hardened. When annealed and for Use at Any Temperature from Cryogenic to the Creep
strain hardened austenitic stainless steel is ordered in accor- Range
dance with Supplementary Requirement S1, the purchaser B 633 Specification for Electrodeposited Coatings of Zinc
should take special care to ensure that 8.2.2, Supplementary on Iron and Steel
Requirement S1, andAppendix X1 are thoroughly understood. B 695 Specification for Coatings of Zinc Mechanically
1.3 Supplementary requirements (S1 through S6) of an Deposited on Iron and Steel
optional nature are provided. These shall apply only when B 696 SpecificationforCoatingsofCadmiumMechanically
specified in the inquiry, contract, and order. Deposited
1.4 This specification is expressed in both inch-pound units B 766 Specification for Electrodeposited Coatings of Cad-
and in SI units. However, unless the order specifies the mium
applicable“ M” specification designation (SI units), the mate- E112 Test Methods for Determining Average Grain Size
4
rial shall be furnished to inch-pound units. 2.2 American National Standards:
1.5 The values stated in either inch-pound units or SI units B 1.1 Unified Screw Threads
are to be regarded separately as standard. Within the text, the B 1.2 Gages and Gaging for Unified Inch Screw Threads
SI units are shown in brackets. The values stated in each B 1.13M Metric Screw Threads
system are not exact equivalents; therefore, each system must B 18.2.2 Square and Hex Nuts
be used independently of the other. Combining values from the B 18.2.4.6M Metric Heavy Hex Nuts
two systems may result in nonconformance with the specifi-
3. Terminology
cation.
3.1 Definitions of Terms Specific to This Standard:
3.1.1 Austenitic Grades—All grades with a prefix of “8” or
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This specification is under the jurisdiction of ASTM Committee A01 on Steel, “9”.
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.22 on Steel Forgings andWrought Fittings for PipingApplications and Bolting
3
Materials for Piping and Special Purpose Applications. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved September 15, 2005. Published October 2005. Origi- contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
nally approved in 1936. Last previous edition approved in 2005 as A 194/ Standards volume information, refer to the standard’s Document Summary page on
A 194M–05. the ASTM website.
2 4
For ASME Boiler and Pressure Vessel Code applications see related Specifi- Available from American National Standards Institute, 25 W. 43rd St., 4th
cation SA-194 in Section II of that code. Floor, New York, NY 10036.
*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.
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A 194/A 194M – 05a
3.1.2 Ferritic Grades—Grades1,2,2H,2HM,3,4,6,6F,7, 5. Common Requirements
7M, and 16.
5.1 Materialan
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