Metallics JTSP23 8 x 1-1/2 in. Pan Head Phillips Sharp Point Tapping Screws - Steel Zinc - Each

The pan head measures 0.306 to 0.322 inch across and 0.105 to 0.115 inch high. A pan head sits on top of the surface rather than countersinking, so it needs a clear bearing surface around the hole. If you need the fastener flush with a panel or plate face, specify a flat head instead.

No. The JTSP23 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. For federally funded work carrying domestic sourcing requirements, you need a fastener with documented domestic origin.

The JTSP23 is a Type A tapping screw, meaning it has a sharp gimlet point and coarse 15 threads per inch that cut their own thread as the screw drives. That combination is meant for thin sheet metal and soft materials where you drive into a pilot hole or thin stock without tapping first. If you are fastening into thicker steel, you want a blunt-point thread-cutting type instead, not a Type A.

Use a #2 Phillips bit. The recess runs 0.169 to 0.182 inch in diameter, 0.108 inch deep, with a 0.03 inch recess width, which is standard #2 Phillips geometry. Driving a #8 pan head with a #1 bit will cam out and strip the recess.

These are carbon steel screws with a zinc finish, made from AISI 1016 to 1024 steel. Zinc plating handles dry indoor service and incidental moisture, not sustained exterior exposure or washdown. For outdoor enclosures, coastal work, or damp locations, move to stainless steel fasteners.

At #8 diameter and 1-1/2 inch length, the JTSP23 gives you enough embedment to run through a box flange or conduit strap and bite into wood framing or sheet metal. The gimlet point starts without a pilot in soft material. Just check your stack-up: 1-1/2 inch is the total screw length, not the thread engagement left after the material you are fastening through.

Head and recess dimensions follow ASME B18.6.3-2013, and the thread conforms to ASME B18.6.4, the tapping screw standard. One caveat worth knowing if you are standardizing a parts list: dimensions for the #9 diameter in the JTSP series fall outside ASME B18.6.4.

They ship in a jar of 100, and 100 count is the order minimum. Handy for a service van or a shop bin rather than a bulk production run.

Yes. The JTSP series runs beyond the #8 x 1-1/2 inch JTSP23, and other diameters, lengths and pack quantities can be requested. Note that #9 diameter dimensions in the series are independent of ASME B18.6.4.