Metallics JSPMP80SS 6-32 x 1/2 in. Pan Head Phillips Machine Screws - 18-8 Stainless - Each

They are made to ASME B18.6.3-2010, the dimensional standard for slotted and recessed head machine screws, with 32 threads per inch. Anything else cut to that same standard in 6-32 will thread into the same tapped hole, so you can mix them with existing 6-32 hardware on a job.

18-8 stainless is the usual choice for wet, damp, and exterior work because it resists corrosion far better than plated steel, and that is the material here. It is an austenitic grade, so it is also non-magnetic in the annealed condition. For direct saltwater exposure, 316 stainless is the step up.

No. The JSPMP80SS is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If your contract carries a domestic sourcing clause, this is not the screw for that submittal.

A #2 Phillips driver is the correct fit. The recess diameter is 0.159 in. with a gaging depth of 0.055 to 0.080 in., so a #1 bit will cam out and a #3 will not seat. Keep a #2 in the pouch for these.

The pan head measures 0.256 to 0.270 in. across and 0.087 to 0.097 in. high, so it sits just under a tenth of an inch proud of the surface. That low profile clears most flat cover plates and device yokes, but it is not a flush head, so if the drawing calls for a countersunk finish you want a flat head screw instead.

Tensile strength is 80,000 psi minimum, with hardness in the Rockwell BBS-B9S range. Treat that as an approximation: there is no single performance standard for stainless machine screws, so stainless values are published as guides rather than guarantees. Stainless also galls if you run it in dry and fast, so drive it slow or use an anti-seize on tapped holes.

A machine screw like this one has a uniform straight thread and needs a pre-tapped hole or a mating nut. That is exactly what you have in an electrical box ear, a device yoke, or a panel bracket. If you are fastening into bare sheet metal with no tapped hole, use a self-drilling or thread-cutting screw instead, not a 6-32 machine screw.

They ship in a jar of 100, which is also the order minimum, at about 0.3 lbs per jar. That is a sensible shelf quantity for a service van or an MRO crib rather than a loose count, and the jar keeps them sorted from the rest of your 6-32 stock.