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A hex cap screw in smaller sizes may not have a shoulder. When a hex cap screw is fully threaded it can also be referred to as a tap bolt.
Hex cap screws 1"-8 in zinc plated grade 5 steel. A hex cap screw is a cap screw with a hexagonal head, designed to be driven by a wrench. An ASME B18.2.1 compliant cap screw has somewhat tighter tolerances than a hex bolt for the head.
A Hex Bolt is measured as: Diameter x Thread Pitch x Length from Under Head
FT: Fully Threaded
PT: Partially Threaded
** 1"-8 Hex Cap Screws listed as PT, usually have a threaded portion of about 2-1/4".
However, this can vary slightly from manufacturer to manufacturer.
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