ASTM A194 - Hot forging Hex screw, studbolt and hex nut ASTM A193 B7,B7M,B16,B8,B8M,A453 660,A182 F55,A182 F51,ASTM A182 F44,INCOLOY 925 (UNS N09925),INCONEL 625,INCONEL 718,INCONEL C-276,MONEL K-500,MONEL 400

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ASTM A194 pecification covers a variety of carbon, alloy, and martensitic and austenitic stainless steel nuts. These nuts are intended for high-pressure or high-temperature service, or both. Bars from which the nuts are made shall be hot-wrought.
According to ASTM A194 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. Each alloy shall conform to the chemical composition requirements prescribed. Hardness tests, proof of load tests, and cone proof load tests shall be made to all nuts to meet the requirements specified.
ASTM A194 stated in either inch-pound units or SI units are to be regarded separately as standard. 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. Within the text, the SI units are shown in brackets.
ASTM A194  covers 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.
Unless otherwise specified, the American National Standard Heavy Hex Series (ANSI B 18.2.2) shall be used. Nuts up to and including 1 inch nominal size shall be UNC Series Class2B fit. Nuts over 1 inch nominal size shall be either UNC Series Class 2B fit or 8 UN Series Class 2B fit. High strength ASTM A194 grade 2H nuts are common in the marketplace.

High /Low temperature service

ASTM A194 2H      Quenched & tempered carbon steel heavy hex nuts
ASTM A194 2HM   Quenched & tempered carbon steel heavy hex nuts
ASTM A194 4         
Quenched & tempered carbon-molybdenum heavy hex nuts
ASTM A194 3
ASTM A194 6
ASTM A194 7          
Quenched & tempered alloy steel heavy hex nuts
ASTM A194 7M      
Quenched & tempered alloy steel heavy hex nuts
ASTM A194 8          
Stainless AISI 304 heavy hex nuts
ASTM A194 8A
ASTM A194 8M       
Stainless AISI 316 heavy hex nuts
ASTM A194 8C
ASTM A194 8T

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