Except for the very lowest grades, metric nuts and bolts all carry identification markings which indicate their strength. on the head of each bolt are two numbers separated by a decimal point, the full list includes ten grades from 3.6 to 14.9 but in plant and machinery only grades 8.8, 9.8, 10.9 and 12.9 are normally found.
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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