ASTM A194/A194M-22 - 1.5.2022
1. Scope

1.1This specification2 covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range1/4through 4 in. and metric M12 through M100 nominal. It also covers austenitic stainless steel nuts in the size range1/4in. and M12 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.

1.2Bars 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.

1.3Supplementary requirements of an optional nature are provided. These shall apply only when specified in the inquiry, contract, and order.

1.4This 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.

1.5The values stated in either inch-pound units or SI units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Within the text, the SI units are shown in brackets.

1.6This 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


Specification for Zinc Coating, Hot-Dip, Requirements for Application to Carbon and Alloy Steel Bolts, Screws, Washers, Nuts, and Special Threaded Fasteners


Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric


Test Method for Process Control Verification to Prevent Hydrogen Embrittlement in Plated or Coated Fasteners


Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets


Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service


Specification for Stainless Steel Bars and Shapes


Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware


Specification for Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the Creep Range


Practice for Electromagnetic (Eddy Current) Sorting of Ferrous Metals


Test Methods for Determining Average Grain Size


Specification for Electrodeposited Coatings of Cadmium


Specification for Coatings of Cadmium Mechanically Deposited


Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel


Specification for Electrodeposited Coatings of Zinc on Iron and Steel


Test Methods and Definitions for Mechanical Testing of Steel Products