nut bolt screw bolt bolt size m20

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A head with no markings is grade 2, one with 3 lines spaced 120 degrees is grade 5, and 6 lines spaced at 60 degree intervals is grade 8. nuts are marked in several different ways—see identification marks for hex and heavy hex nuts below.

Submittal: c111 t rbolts and nuts for mechanical joint (current revisions for all noted standards apply) sizes: 5/8 x 3 through 1 r1/4 x 8.5 standards: ansi/awwa c111/a21.11 material: astm a242 high strength low alloy steel. also available in ansi 304 or 316 aisi …

These grade b7 steel screws are nearly twice as strong as our stainless steel screws for high-pressure applications. also known as pressure bolts, they meet the high- pressure, high-temperature regulations of astm a193 and are used to secure pressure tanks, valves, and flanges. 18-8 stainless steel heavy hex head

To produce hex bolts, manufacturers most commonly employ a method called cold-forming. a cold-forming machine usually has a series of three or four dies that progressively shape a metal blank into the final shape and dimensions that its manufacturer desires.

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