Metallics JSRM25P 10-32 x 1/2 in. Round Head Phillips Machine Screws - 18-8 Stainless - Each

No. The JSRM25P is listed as not Buy American compliant and not ARRA compliant, with multiple countries of origin. On federally funded or domestic-preference jobs you will need a domestically sourced fastener instead.

A #2 Phillips. The recess is a Phillips drive with a 0.182 to 0.195 inch recess diameter and 0.093 to 0.119 inch depth, so a #2 bit seats fully. A #1 will cam out and chew the recess, and a #3 will not sit down in it.

18-8 stainless is the austenitic 300-series alloy used for general corrosion resistance, so these screws hold up in wet, humid, and exterior locations far better than plain zinc-plated steel. For chloride-heavy environments like coastal or pool rooms, a 316 fastener is the better call; 18-8 is the general-purpose stainless grade.

Tensile strength is 80,000 psi minimum with a hardness of Rockwell B85-B95. That is fine for device mounting, panel covers, brackets, and general assembly, but it is well below a hardened Grade 5 or Grade 8 steel fastener, so do not substitute it where a graded structural bolt is specified. Metallics also notes that tensile figures for stainless screws are approximations, since there is no single performance standard for stainless machine screws.

These come in a jar of 100 as the order minimum, counted by the piece. That is the shop-stock format, so you are buying a jar for the truck or the parts bin rather than a handful. Metallics lists other sizes and quantities by request.

18-8 stainless is prone to thread galling against other stainless, especially if driven fast with a cordless driver. Run them slowly, or use an anti-seize on the threads. Against aluminum you also get a dissimilar metal couple, so in wet locations expect some galvanic attack on the aluminum side.