Metallics JDSP183 10 x 1-1/4 in. 5/16 Hex Head Phillips Sharp Point Tapping Screws - Steel Zinc - Each

The JDSP183 is a Type A tapping screw with a gimlet (sharp) point, which is the style meant for thin sheet metal, where the point starts its own hole and the 12 threads per inch coarse thread pulls in. In light gauge sheet it drives without a pilot; in heavier stock you still want a pilot hole. It is not a machine screw and not a drill point screw, so it will not cut through thick steel plate.

Two options on the same head. The hex washer head measures 0.305 to 0.312 in. across, so a 5/16 nut setter or socket drives it. It also has a Phillips recess, driver size #2, with a recess diameter of 0.178 in. Crews running a lot of them usually go with the 5/16 nut setter for less cam-out; the Phillips is there for tight spots and hand driving.

Yes. The head conforms to ASME B18.6.3-2013 and the thread to ASME B18.6.4, the two standards normally cited on submittals for tapping screws. One caveat worth knowing if you cross-order within the JDSP series: dimensions for the #9 diameter are independent of ASME B18.6.4. The #10 x 1-1/4 in. JDSP183 is within the standard.

Yes, it is a hex washer head. The washer outside diameter runs 0.384 to 0.414 in. with a washer thickness of 0.019 to 0.031 in., and head height is 0.105 to 0.12 in. That flange spreads the clamp load so the head does not pull through thin sheet or a slotted bracket, and it means you do not need to add a separate washer.

The JDSP183 is carbon steel with a zinc finish, which is a dry-location and light-exposure coating. It holds up indoors, in panels, and in protected areas, but zinc plated steel is not a marine or constant-wet fastener. For roof, exterior wall, or wet-location work, specify stainless.

The JDSP183 is case hardened to Rockwell C28-38 and carries a minimum torsional strength of 48 lb-in, made from AISI 1016-1024 steel. That is the standard spec band for a Type A tapping screw, and it is why the hex head takes a nut setter at impact-gun speeds without twisting off. Back the driver off once the washer seats; over-torquing past the rated figure is what strips threads in thin sheet.

Metallics lists the JDSP183 as both ARRA compliant and Buy American compliant, with country of origin China. If your contract runs under a strict domestic-melt-and-manufacture clause rather than the ARRA/Buy American designation, verify against the contract language before you submit it.

They ship in a jar of 100, which is the order minimum (100 count). Jar packaging is the practical part for a van or a gang box: it stays closed, and the count is easy to track against a job. Other sizes and quantities in the JDSP series are available by request.

A jar of 100 runs 0.89 lbs, and the jar itself is listed at 3 x 2.7 x 3 in. Useful if you are building out a stocking list and need to figure shelf space or carton weight for a multi-size fastener order.