Metallics JSHC14225 Screw 1/4-20 x 2-1/4 SHCS St-Blk (Jar 100)

It's a 1/4-20 x 2-1/4 inch socket head cap screw. That's a 1/4 inch diameter body with 20 threads per inch (standard UNC coarse for that diameter) and 2-1/4 inches of length under the head. The internal hex socket drive takes a 3/16 inch hex key on standard inch SHCS.

These are plain steel with a black finish, not zinc or stainless. Black oxide and similar black finishes on SHCS give very little corrosion protection on their own, so keep them to dry interior work: panel and enclosure assembly, strut and bracket mounting, machine work. For wet locations or exterior runs, specify a hot dip galvanized or stainless fastener instead.

Yes. 1/4-20 is 1/4-20 regardless of head style, so this screw mates with any 1/4-20 strut nut, spring nut, tapped boss, or standard hex nut. The thing to check is length: at 2-1/4 inches under the head you need enough clearance behind the joint for the excess thread, or you'll bottom out on a blind tapped hole. Measure your total grip and pick a shorter length if the stack is thin.

100 screws per jar. Metallics packs these in a screw-top jar rather than a bag or box, which is the handier format for a van or shop bench since you can pour out a handful and reseal it.

The socket head drives from inside the head with a hex key, so you can run it in tight spots where a wrench or socket won't swing, and the cylindrical head sits in a counterbore or close to an adjacent surface where a hex head would foul. Trade-off: you need the right size hex key, and a worn or dirty socket is easier to strip than hex flats. If the fastener is out in the open and you want to torque it with a ratchet, a hex head is the easier choice.

Order it as Metallics JSHC14225. The J prefix is the jar pack, SHC is socket head cap, and 14225 reads as 1/4-20 by 2-1/4 inch. That one number covers the whole 100 piece jar, so distributors quoting it don't need a separate pack code.