"This specification covers a variety of carbon@ alloy@ and martensitic stainless steel nuts in the size range M6 through M100 [? through 4 in.] nominal. It also covers austenitic stainless steel nuts in the size range M6 [? in.] nominal and above. These nuts are intended for high-pressure or hightemperature 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."