Metallics JSTSP40 6 x 1-1/4 in. Pan Head Phillips Tapping Screws - 18-8 Stainless - Each

The Metallics JSTSP40 is a Type A tapping screw with a gimlet point, which is the classic sharp-point sheet metal screw. It cuts its own thread as it drives into a pilot hole in thin sheet metal, enclosures, and panels, so no nut or tapped hole is needed. At #6 diameter and 1-1/4 in. long with 18 threads per inch, it is a light-duty fastener for mounting devices, plates, straps, and brackets to sheet steel or aluminum.

They can. The JSTSP40 is 18-8 stainless, and fastening stainless parts to aluminum or steel sets up a galvanic couple in some environments, which corrodes the lighter metal around the fastener. Outdoors, in damp mechanical rooms, or near coastal air, that is worth thinking about on aluminum enclosures. Where the base metal is plain or galvanized steel in a dry interior, the 18-8 screw is normally what you want for its own corrosion resistance.

These #6 x 1-1/4 in. stainless tapping screws ship in a jar of 100, and 100 count is the order minimum. If you are standardizing a maintenance cart or a panel shop on one fastener, order in multiples of that jar.

A #2 Phillips bit. The JSTSP40 takes a Phillips drive with a recess diameter of 0.153 to 0.166 in. and 0.091 in. recess depth, so a #2 tip seats fully; a #1 will cam out and chew the recess under torque.

The JSTSP40 is rated to a 24 lb-in minimum torsional strength. That is modest, which is normal for #6 stainless: stainless work-hardens and will twist off before it strips, so drive these with a clutch set low or by hand on the final seat rather than running a full-power impact driver into them.

The pan head on the JSTSP40 measures 0.256 to 0.270 in. across and 0.087 to 0.097 in. high, so it sits just under a tenth of an inch proud of the surface with a broad bearing face. That is low enough to clear most device cover plates and trims, but it is not a flush fastener, so if the spec calls for a screw that finishes flat in a countersink you need a flat head instead.

Yes. The head geometry on the JSTSP40 follows ASME B18.6.3-2013 and the thread follows ASME B18.6.4, which is the tapping screw thread standard. One caveat for anyone speccing across the series: dimensions for the #9 diameter are independent of ASME B18.6.4.

The JSTSP40 carries both a Buy American compliance flag and an ARRA compliance flag in the manufacturer's data, which is what a government, school, or transit procurement package typically asks for on fasteners. Attach the manufacturer's compliance letter to your submittal if the owner requires signed documentation.

The gimlet point and coarse 18 threads per inch on the JSTSP40 are cut for thin sheet metal, which is its intended use, and it will also bite in wood, particle board, and some plastics the way any sharp point sheet metal screw does. What it is not meant for is thick structural steel or masonry: there is no drill point and no anchor, so heavy plate needs a self-drilling screw and concrete or block needs a screw anchor.