Hex Cap Screws and Tap Bolts

Zinc Plated Grade 5 Steel Hex Head Bolts

A hex cap screw is a cap screw with a hexagonal head, designed to be driven by a wrench (spanner). An ASME B18.2.1 compliant cap screw has somewhat tighter tolerances than a hex bolt for the head height and the shank length. The nature of the tolerance difference allows an ASME B18.2.1 hex cap screw to always fit where a hex bolt is installed but a hex bolt could be slightly too large to be used where a hex cap screw is designed in.

Hex Cap Screws, commonly referred to as Hex Bolts, or Hex Head Bolts are bolts with a shoulder in longer lengths. Hex Cap Screws are fully threaded in shorter lengths (usually around up to 1-1/2 inch, depending upon the bolt diameter), and partially threaded with a shoulder beneath the fastener hex head in longer lengths.

All Hex Cap Screws and Tap Bolts in this selection are zinc plated Grade 5 steel. Grade 5 Zinc Hex Bolts are distinguished by the three hash marks on the top of each bolt's head.