Metallics JSRM101P 12-24 x 1 in. Round Head Phillips Machine Screws - 18-8 Stainless - Each

Yes. 12-24 at 24 threads per inch is the thread used for grounding screws and device/box mounting holes in standard steel electrical boxes and mounting rings, which is why the Metallics JSRM101P is listed for electrical, plumbing, and HVAC work. The 1 inch length gives you reach through a plaster ring or a stack of mounting hardware; if you only need to pick up a tapped hole in a box ear, a shorter length will seat flush sooner.

They are 18-8 stainless, the austenitic grade normally specified for wet, humid, and exterior use, so they hold up far better than zinc plated steel in rooftop HVAC, wet-location boxes, and washdown areas. Hardness is Rockwell B85-B95. Note that 18-8 is non-magnetic and softer than hardened carbon steel, so do not over-torque into a tapped hole.

No. The JSRM101P is not Buy American compliant and not ARRA compliant, with country of origin listed as multiple. If your contract carries a domestic sourcing clause, this fastener will not satisfy it.

A #3 Phillips. The recess runs 0.236 to 0.249 inch in diameter with a 0.099 to 0.125 inch depth, so a #2 bit will ride high in the recess and cam out under torque. Keep a #3 in the pouch if you are driving a jar of these.

Round head, so yes, it stands above the surface. Head height is 0.139 to 0.153 inch and head width 0.382 to 0.408 inch. That bearing surface covers an oversized or slotted mounting hole well, but if you need the fastener flush in a countersunk hole, a round head is the wrong head type, go with a flat head instead.

Rated 80,000 psi minimum, to SAE material standard. One caution the manufacturer states outright: tensile values for stainless machine screws are approximations, because there is no single performance standard for them. If your spec calls out a hard proof load class, a graded carbon steel fastener is the better match.

Screws only, no nuts or washers included. A machine screw has a uniform 12-24 thread with a blunt end, so it needs either a tapped hole (like the ground screw hole in a steel box) or a matching 12-24 nut sourced separately. It will not cut its own thread in sheet metal the way a self-tapping screw does.

They ship in a jar of 100, and 100 is the minimum order quantity. Each jar weighs 1.13 lbs. If you are standardizing a fleet of panels or boxes on one fastener, order in jar multiples.