Metallics JSHC516112 5/16-18 x 1-1/2 in. Socket Head Hex Cap Screws - Alloy Steel Black - Each

Yes. The Metallics JSHC516112 alloy steel socket head cap screw is rated 180,000 psi minimum tensile and 162,000 psi minimum yield, which is above what a Grade 5 or Grade 8 hex head cap screw of the same diameter delivers. Because it's internally wrenched with a hex socket, it also does that in less bearing surface or counterbore area than a hex head needs. Hardness is Rockwell C39.

18 threads per inch in a UN thread form, which is the standard 5/16 coarse (UNC) pitch. It will thread into any 5/16-18 tapped hole or nut. If the hole in your strut, panel, or bracket is 5/16-24 fine, this screw will not start in it.

No. These are not Buy American compliant and not ARRA compliant; country of origin is listed as multiple. On a federally funded or domestic-preference job you'll need a domestically sourced fastener instead.

It takes a hex (Allen) key, not a wrench on the outside of the head. Socket depth is 0.151 in. Head width measures 0.457 to 0.469 in. and head height 0.306 to 0.312 in., so a counterbore has to clear roughly half an inch of head diameter if you're sinking it flush.

It ships as a jar of 100 pieces, with 100 as the order minimum. Plan the count per opening or per rack accordingly if you only need a handful.

The finish is a black alloy steel finish, not zinc, stainless, or hot dip galvanized. Plain black alloy is a dry-location fastener; for exposed exterior or wet locations on a job, specify a zinc plated or stainless socket head cap screw instead.

Dimensions conform to ASME B18.3-2012, the inch socket cap screw standard, so head and socket geometry will match any other B18.3 screw your spec or drawing calls out.

They're stocked for electrical, plumbing, and heating and air conditioning work, so think equipment mounting, strut and channel assemblies, machine frames, and bracket connections where a high strength screw has to sit in a counterbore. A 1-1/2 in. length at 5/16 diameter is well past 3D, so it's subject to tensile, yield, elongation, and reduction of area testing.

Elongation is 10 percent minimum and reduction of area 33 percent minimum on machined specimens. That's hardened alloy at Rockwell C39, so treat it as a high strength, low ductility fastener: good in tension in a properly torqued joint, not something to bend or re-use after yielding.