Cold Formed Bolts, Screws, and Nuts

Parts formed through the mechanical cold (at a temperature below the recrystallization temperature) up-setting of wire, rod, or bar in order to generate the bolt or screw head (cold heading) or the configuration of the nut.

Source: API Specification 20E, Alloy and Carbon Steel Bolting for Use in the Petroleum and Natural Gas Industries, Second Edition, February 2017. Global Standards

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