Metallics JSTSP251 Screw 10 x 2 PN PH TS 316 SS (Jar 100)

The JSTSP251 is a #10 by 2 inch pan head Phillips sheet metal screw in 316 stainless steel, sold in a jar of 100. The #10 diameter with a 2 inch length is the common choice for strap, clamp, and enclosure fastening where the screw cuts its own thread into sheet metal or a pilot-drilled hole.

Yes, and that is the whole reason to pick the JSTSP251. 316 stainless carries molybdenum, which is what gives it its chloride resistance, so it holds up in salt air, wash-down areas, pool rooms and waste-water plants where 18-8 (304) stainless pits. For dry indoor panel work 18-8 is normally enough; outdoors near the coast, 316 is the grade to specify.

It will not sit flush. A pan head sits proud of the surface with a broad flat bearing face underneath, which is what you want for clamping straps, brackets, and ground clips. If the head has to finish flush in a countersunk hole, you need a flat (countersunk) head screw instead, not this one.

Tapping sheet metal screws like this one form their own thread but they are not self-drilling, so there is no drill point on the tip. You drill or punch a pilot hole sized for the #10 shank first, then drive the screw to cut its thread. If you want to skip the pilot step, you want a self-drilling (TEK-style) screw instead.

That is the intended use. Metallics lists the JSTSP251 as an electrical fastener, and a #10 x 2 inch 316 stainless pan head Phillips is used for mounting straps, clips, covers, and boxes, including outdoor and wet-location enclosures where a plated steel screw would rust out.

100 screws per jar. Metallics packs this one in a jar rather than a box, which is how it is bought for truck stock and shop bins where a technician is pulling a handful at a time.

A #2 Phillips is the correct bit for a #10 Phillips pan head. Drive it slow in stainless, since 316 work-hardens and galls if you spin it, and back off the clutch so you do not snap the head on the last turn.