Metallics JSTSP25 10 x 2 in. Pan Head Phillips Tapping Screws - 18-8 Stainless - Each

The JSTSP25 is a Type A tapping screw with a gimlet point, meaning it has a sharp pointed tip that starts its own thread in sheet metal, with 12 threads per inch cut to ASME B18.6.4. It is a #10 diameter screw, 2 inches long, intended for electrical, plumbing, heating and air conditioning work. Use it where you are driving into a pilot hole or thin sheet stock, not as a machine screw into a tapped hole.

No on both counts. The JSTSP25 is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. If your federal, state, or institutional contract carries a domestic-content clause, this screw will not satisfy it.

Mechanically yes, but be aware of the galvanic issue: fastening 18-8 stainless parts to aluminum or steel can set up a galvanic couple in some environments, which corrodes the lesser metal at the joint. Outdoors, in wet locations, or in coastal air, isolate the joint or accept that the aluminum will take the hit. Indoors and dry, the 18-8 stainless is the reason to choose this screw in the first place.

Minimum torsional strength on this #10 screw is 48 lb-in. Stainless tapping screws twist off more readily than hardened carbon steel, so set the clutch on your driver rather than running it out on impact, especially at 2 inches of length where you are cutting a lot of thread.

Pan head, so it sits on top of the surface, not flush. Head height runs 0.122 to 0.133 in. and head diameter 0.357 to 0.373 in., dimensioned to ASME B18.6.3-2013. That bearing surface is useful for clamping sheet metal and strap, but if you need the head buried you want a flat head countersunk screw instead.

They ship in a jar, with a minimum of 100 per jar. Jar weight comes to 1.46 lbs. That is the buying unit, so plan quantities in jars rather than in individual screws.

At 2 inches of overall length under a pan head, you get a usable grip through 3/4 in. backboard plus the sheet behind it, with thread engagement to spare. Because it is a Type A gimlet point, the screw forms its own thread as it goes, so the full length is threaded rather than having a plain shank.