What is the shank length of a bolt?

Shank Length Fastener length is measured from where the material surface is assumed to be, to the end of the fastener. For fasteners where the head usually sits above the surface, the measurement is from directly under the head to the end of the fastener.

DIN931-1-1987,Hexagon head bolts-strength Shank-half thread Bolts supply

DIN960-1990,Hexagon head bolts-reduced shank-fine pitch thread supply

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