Scope
The ASTM A194 specification covers carbon, alloy and stainless steel nuts intended for use in high-pressure and/or high-temperature service. 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 Class 2B 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 and are often substituted for ASTM A563 grade DH nuts due to the limited availability of DH nuts in certain diameters and finishes.
Grades
2
Carbon steel heavy hex nuts
2H
Quenched & tempered carbon steel heavy hex nuts
2HM
Quenched & tempered carbon steel heavy hex nuts
4
Quenched & tempered carbon-molybdenum heavy hex nuts
7
Quenched & tempered alloy steel heavy hex nuts
7M
Quenched & tempered alloy steel heavy hex nuts
8
Stainless AISI 304 heavy hex nuts
8M
Stainless AISI 316 heavy hex nuts
Chemical Properties
Element2, 2H, and 2HM47 and 7M (AISI 4140)8 (AISI 304)8M (AISI 316)