Hex Hd Cap Screw

Flat washer facing under the head that meet specific tolerances as described under ASME B18.2.1-1996.

They will usually be manufactured by a cold-heading process (large runs of standard sizes) or turned CNC operation.

A radius under the head at the shank.

Body diameter of plus nothing, minus .011″ for an 1-1/4″ diameter fastener.

Some common fastener specifications unless otherwise specified: ASTM A449 and SAE J429 Grade 2, 5, and 8