AASHTO M 292M/M 292-20

This specification covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range M6 through M100 [1/4 through 4 in.] nominal. It also covers austenitic stainless steel nuts in the size range M6 [1/4 in.] 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.

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 Section 8.2.2, Supplementary Requirement S1, and Appendix X1 are thoroughly understood.

Supplementary requirements (Sections S1 through S8) of an optional nature are provided. These shall apply only when specified in the inquiry, contract, and order.

This specification is applicable to orders in either SI units (as M 292M) or inch-pound units (as M 292). SI units and inch-pound units are not necessarily equivalent. Inch-pound units are shown in brackets in the text. Material shall be furnished to SI units when the order specifies the applicable “M” designation.