Metallics JSPM28SS 10-32 x 1-1/4 in. Pan Head Slotted Machine Screws - 18-8 Stainless - Each

The JSPM28SS is 18-8 stainless, so it holds up in wet, damp, and corrosive environments far better than a zinc-plated steel screw. That makes it the choice for exterior boxes, parking decks, food plants, pools, and coastal work where plated screws rust and seize in a season or two.

It's a slotted drive, so you need a flat blade. The slot measures 0.05 to 0.06 in. wide and 0.053 to 0.068 in. deep, so a thin cabinet-tip blade seats best. A slot has no self-centering like Phillips or square drive, so hand driving or a low-speed driver with steady pressure keeps the blade from skating off the head and marring the device plate.

Head height runs 0.099 to 0.11 in. and head width 0.357 to 0.373 in. A pan head sits low and round with a flat bearing surface, so it seats against a cover plate or bracket without needing a countersink. If you need the head flush with the surface, a pan head is the wrong profile, use a flat head in a countersunk hole instead.

They come in a jar of 100, and 100 count is the order minimum. That is a bench or truck-stock quantity rather than a bulk box, which suits a service van or a shop drawer where you grab a handful at a time.

They are made to ASME B18.6.3-2010, the dimensional standard for slotted and recessed head machine screws, with material to SAE. Because the thread and head geometry follow that standard, a 10-32 pan head from the SPM series drops into the same holes and tapped threads as any other conforming 10-32 pan head machine screw.

The JSPM28SS is flagged compliant for both Buy American and ARRA, which is what a public agency, school district, or federal project submittal asks for on fasteners.

Tensile strength is listed at 80,000 psi minimum with hardness in the Rockwell B range. Stainless galls easily when run dry into a stainless or aluminum tapped thread, so snug them rather than leaning on them, and back out and restart if a screw starts to drag. Note that tensile values for stainless screws are approximations, since there is no single performance standard for stainless machine screws.

Yes. The Metallics SPM machine screw line runs other diameters, lengths, and pack quantities on request, so you can standardize a facility on 18-8 stainless pan head slotted screws and still pick the length that suits each box depth.