Metallics JSRM24P 10-24 x 1-1/4 in. Round Head Phillips Machine Screws - 18-8 Stainless - Each

These are 18-8 stainless, the austenitic grade commonly specified where plated steel would rust, so they hold up in wet locations, outdoor boxes, and washdown areas far better than zinc-plated screws. Note the tradeoff: stainless is softer than hardened steel, with a hardness of Rockwell B85 to B95 and a minimum tensile strength of 80,000 psi, so do not over-torque them in tapped steel.

No. The JSRM24P is not Buy American compliant and is not ARRA compliant, with multiple countries of origin. On a federally funded project with domestic sourcing language in the spec, these will not satisfy it and you need a domestically produced fastener.

A #2 Phillips bit is the correct driver. The recess measures 0.182 to 0.195 inch in diameter with a 0.093 to 0.119 inch depth, so a #1 bit will cam out and a #3 will not seat. Standard #2 bit in a cordless driver or hand screwdriver handles the whole jar.

The round head stands 0.123 to 0.137 inch proud and spans 0.334 to 0.359 inch across, so it is a domed profile that sits entirely on top of the material. If you need the head flush or countersunk into a plate or panel, a round head is the wrong choice and you want a flat head screw instead.

The JSRM24P is a 1-1/4 inch long 10-24 screw, which gives you room to pass through a device, a plaster ring, or stacked material and still pick up several threads. It is longer than the typical 1/2 to 3/4 inch screw shipped with a box or device, so for simple device mounting it will often be too long and leave excess thread behind the box. Other lengths in the SRM series are available on request.

Treat the 80,000 psi minimum as an approximation. Metallics states plainly that tensile values for stainless screws are approximations only, because there is no single standard governing performance requirements for stainless machine screws. Dimensionally the screw follows SAE material standards. For a structural or load-rated connection, specify a fastener with a published grade instead.

They come in a jar of 100 pieces, and 100 is the order minimum, so you are buying by the jar rather than the piece. Jar weight is 0.99 lbs. That quantity suits a stocked MRO shelf or a truck bin rather than a one-screw repair.