ASTM A194 Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both

ASTM A194 covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range 1/4 through 4in. 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.

Grades in ASTM A194

Grade symbol, Material, UNS number
1 carbon
2, 2HM and 2H carbon
4 carbon, molybdenum
3 Type501
6 Type410 S41000
6F Type416 S41600
6F Type416Se S41623
7,7M Type4140/4142/4145,4140H,4142H,4145H
8,8A Type304 S30400
8C,8CA Tpye347 S34700
8M,8MA Type316 S31600
8T,8TA Tpey321 S32100
8F,8FA Type303 S30300
8F,8FA Type303Se S30323
8P,8PA Type305 with restricted carbon S30500
8N,8NA Type304N S30451
8LN,8LNA Type304LN S30453
8MN,8MNA Type316N S31651
8MLN,8MLNA Type316LN S31653
8S,8SA S21800
8MLCuN,8MLCuNA S31254
9C,9CA N08367
16 Chromium Molybdenum Vanadium