Metallics JSHC58234 5/8-11 x 23/4 in. Socket Head Hex Cap Screws - Alloy Steel Black - Each

The alloy steel socket head design carries 170,000 psi minimum tensile and 153,000 psi minimum yield, with a hardness of Rockwell C37. That is above what equivalent sizes of Grade 5 or Grade 8 hex head cap screws deliver, and because it is internally wrenched it does that with less bearing surface or counterbore diameter. Elongation is 10 percent minimum and reduction of area 33 percent minimum on machined specimens.

No. The JSHC58234 is not Buy American compliant and is not ARRA compliant, with origin listed as multiple countries. If your job carries a domestic-content clause, this screw will not satisfy it.

It is built to ASME B18.3-2012, the inch socket cap screw standard, so head diameter, head height and socket geometry match any other B18.3 5/8-11 x 2-3/4 socket head cap screw. Swapping it into an existing counterbore of the right size is straightforward, and the socket depth is 0.307 in.

A hex key, not a wrench. The head is a socket type with an internal hex drive, so it is wrenched from inside the head rather than across flats. That is also why it fits in a counterbore where a hex head bolt would not clear.

The material is alloy steel with a black finish, which is a thermal/oxide type black rather than a plated corrosion barrier. Treat it as an indoor or protected-location fastener; for wet or exterior work, use a plated or stainless cap screw instead.

These ship in jar packaging with a minimum of 25 each, so the smallest purchase is a 25-piece jar rather than a loose screw. Other sizes and quantities are available by request.

Yes, it is intended for the electrical, plumbing, heating and air conditioning trades: equipment mounting, strut and bracket assemblies, machine and panel fastening where a high strength screw has to sit in a counterbore. At 5/8-11 x 2-3/4 with 170,000 psi minimum tensile, it is a structural-duty fastener, not a sheet metal screw.