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ASTM A194

astm-a194-grade-nutsThis specification 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. 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.

 

Grades Covered Under Astm A194

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

 

Mechanical Properties
Nut -Grade Identification Markings

All markings shown for all grades of A194 are for cold formed and for hot forged nuts. When nuts are machined from bar stock, the nut must additionally be marked with the letter "B"

Grade Identification Marking5 Specification Material Nominal Size, In. Tempering Temp. °F Proof Load Stress, ksi Hardness Rockwell See Note
Min Max
A194 Grade 2 Bolts ASTM A194 Grade 2 Medium Carbon Steel 1/4 - 4 1000 150 159 352 1,2,3
ASTM A194 - Grade 2H ASTM A194 Grade 2H Medium Carbon Steel, Quenched and Tempered 1/4 - 4 1000 175 C24 C38 1,2
ASTM A194 - Grade 2HM ASTM A194 Grade 2HM Medium Carbon Steel, Quenched and Tempered 1/4 - 4 1000 150 159 237 1,2,3
ASTM A194 Grade 4 Medium Carbon Alloy Steel, Quenched and Tempered 1/4 - 4 1100 175 C24 C38 1,2
ASTM A194 - Grade 7 ASTM A194 Grade 7 Medium Carbon Alloy Steel, Quenched and Tempered 1/4 - 4 1100 175 C24 C38 1,2
ASTM A194 - Grade 7M ASTM A194 Grade 7M Medium Carbon Alloy Steel, Quenched and Tempered 1/4 - 4 1100 150 159 237 1,2,3
ASTM A194 - Grade 8 ASTM A194 Grade 8 Stainless AISI 304 1/4 - 4 - 80 126 300 4
ASTM A194 - Grade 8M ASTM A194 Grade 8M Stainless AISI 316 1/4 - 4 - 80 126 300 4

 

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