Metallics JSRM137P 3/8-16 x 3/4 in. Round Head Phillips Machine Screws - 18-8 Stainless - Each

The JSRM137P is a 3/8-16 screw, 3/4 inch long, so it threads into any 3/8-16 tapped hole or nut at 16 threads per inch. That is the coarse-thread series, so it will not engage a fine-thread 3/8-24 hole. Check the tap in your box or channel before ordering.

Use a #4 Phillips driver. The recess is a large one, 0.374 to 0.387 inch diameter with 0.202 to 0.228 inch depth, so a #2 or #3 bit will ride up and chew the recess under any real torque.

The round head measures 0.67 to 0.708 inch across and sits 0.237 to 0.256 inch proud of the surface. That domed quarter-inch of height is the number to watch if a cover, trim ring, or panel closes over the screw. Where you need a flush surface, a flat head countersunk screw is the right choice instead.

No. The JSRM137P is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. On a federally funded project with domestic sourcing language in the spec, you need a domestically produced fastener instead.

Machine screws are measured from under the head on a round head, so the full 3/4 inch of the JSRM137P is usable shank. Subtract the thickness of whatever you are fastening through to see what is left in the tapped hole. On thin sheet steel enclosure walls almost the entire 3/4 inch engages; through a thicker bracket or spacer you may need a longer screw.

Yes. The JSRM137P is 18-8 stainless, the austenitic grade used where plated steel screws would rust, so it holds up in wet locations, exterior enclosures, and washdown areas. It is also non-magnetic in the annealed condition, which matters in some instrument and panel work.

Tensile strength is 80,000 psi minimum with a hardness of Rockwell B85 to B95, measured to SAE material standards. Metallics notes that tensile figures for stainless machine screws are approximations, since there is no single performance standard for them. If your drawing calls out a specific grade such as a hardened alloy fastener, this is not a substitute.

They come 100 to a jar, and the jar is the minimum order unit. Total packed weight is 3.66 lbs. Metallics offers other sizes and quantities of the SRM round head series by request.

Metallics lists the SRM round head series for the electrical, plumbing, heating and air conditioning industries. In practice that means machine-threaded holes: strut and channel nuts, enclosure and panel tapping, equipment mounting feet, hanger and bracket assembly. A machine screw needs a tapped hole or a nut, so it is not a self-tapping or sheet metal screw.