Metallics JTRM102 1/4-20 x 1-1/4 in. Round Head Tri-Drive Machine Screws - Steel Zinc - Each

The JTRM102 is cut 1/4-20, meaning a 1/4 inch diameter with 20 threads per inch, which is the coarse UNC pitch used on most tapped enclosure, strut and panel hardware in the US. Grip length is 1-1/4 inches, so it suits stack-ups where you need thread engagement past a cover plus a spacer. For thinner stack-ups, step down to a shorter length so you are not bottoming out in a blind tapped hole.

Tri-drive means the round head takes three different drivers: a flat slot, a Phillips bit, or a square (Robertson) bit. One screw works with whatever is already on the belt or in the pouch, which is why it gets specified for panel and box work where crews carry mixed bits.

It is zinc plated steel, which handles indoor and protected damp conditions but is not a marine or sustained-outdoor fastener. For wet or corrosive exposure, specify stainless rather than zinc plated steel.

No. It is the machine screw only, 1/4-20 x 1-1/4 inch, so order 1/4-20 nuts, lock washers or flat washers separately if the assembly is not going into a tapped hole.

A round head sits proud on the surface and bears on the face of the material, so it does not need a countersunk hole. Flat head is the choice when the fastener has to finish flush. The JTRM102 is the round head version, and it mates with a plain drilled or tapped hole.

They ship in a jar of 100, which is the format most electricians keep in a van bin or on a shop shelf rather than a bulk carton. The screws are made in the USA.