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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.
Grade 8 Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or both. ASTM A194 specification covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range 1/4 through 4 in. and metric M6 through M100 nominal.
Rated Grade 7 or Grade 8, these nuts are about 25% stronger than medium-strength steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
Grade 8 nuts can be produced by means of hot forging, cold forging or machining from heat treated bar stock and used with ASTM A193 B8 bolts, screws and studs. ASTM A194 specification covers requirements for chemical composition, heat treatment, hardness, proof load, etc., for Grade 8 nuts.
3.1.3.2 For Grade 8 Nuts—The quantity of all the nuts of a single nominal diameter and grade made from the same heat of steel and made by the same manufacturing process.
The ASTM A194 Grade 8 Heavy Hex Nuts are strong and they are used with high torque force for tightening them. The material has carbon, manganese, silicon, phosphorus, sulfur, and 18% chromium with 8% nickel. The sa 194 gr b8 fasteners is made from 304 grade austenitic stainless steel.
Grade 8M stainless steel heavy hex nuts are intended for use in high-pressure and/or high-temperature service with ASTM A193 and A320 bolting of similar material, such as B8M and B8M Class 2. Heavy hex nuts provide increased bearing surface area over finished nuts.
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