Metallics JTSS31 10 x 2 in. Pan Head Square Drive Tapping Screws - Steel Zinc - Each

The JTSS31 is a Type A tapping screw with a gimlet point, so it needs a pilot hole or an existing punched hole. It cuts its own thread as it goes, but it will not drill through steel on its own. For thin sheet metal, knockout holes, or wood framing the gimlet point works fine. If you are going into unpunched heavier gauge steel with no pre-drilling, you want a self-drilling (Type TEK) screw instead.

The JTSS31 is a #10 diameter, 2 inch long screw with 12 threads per inch, cut to the ASME B18.6.4 thread standard for tapping screws. That is the coarse Type A pitch, meant to form its own thread in a punched or drilled hole rather than mate with a tapped one. Head dimensions run 0.357 to 0.373 inch across and 0.122 to 0.133 inch high, so it seats on a standard #10 knockout or clearance hole without needing a washer.

No. The JTSS31 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If your spec carries a domestic sourcing requirement, these will not pass submittal and you need a domestically produced fastener.

They ship 100 per jar, and 100 is the order minimum. The filled jar weighs 1.29 lbs. If you need a different count or a different size in the JTSS series, other sizes and quantities are available by request.

The JTSS31 is carbon steel (AISI 1016-1024) with a zinc plated finish. Zinc plating handles indoor humidity, mechanical rooms, and covered areas. For direct weather exposure, coastal air, or treated lumber contact, specify stainless or a hot dip galvanized fastener instead, since plated zinc will eventually rust through in those conditions.

The JTSS31 is case hardened to Rockwell C28-38 with a minimum torsional strength of 48 lb-in. That is the standard tapping screw spec and it is enough for normal driving, including a low torque setting on a cordless impact. A full power impact into dense material will still twist a #10 screw off, so back the clutch down and let the gimlet point do the work.

Head and recess geometry follow ASME B18.6.3-2013, threads follow ASME B18.6.4, and the material is AISI 1016-1024 steel. Note that in the JTSS series, dimensions for the #9 diameter fall outside ASME B18.6.4; the #10 x 2 inch JTSS31 is within standard.

Pan head. The JTSS31 has a rounded pan head about 0.357 to 0.373 inch across that sits on top of the surface with a broad bearing face, which is what you want for clamping strap, clips, box covers, and plate-mounted equipment. It will not sit flush. If the fastener has to finish level with the surface, you need a flat head countersunk screw and a countersunk hole.

Metallics lists the application as the electrical, plumbing, heating and air conditioning industries. At 2 inches, the #10 screw has enough reach to go through a bracket or clip and into a stud or blocking behind drywall, or to pick up through stacked sheet metal. Shorter lengths in the JTSS series handle thin sheet-to-sheet work where 2 inches would leave a point sticking out the back.