Metallics JSRM50 6-32 x 3/8 in. Round Head Slotted Machine Screws - 18-8 Stainless - Each

6-32 is the standard thread for device yokes, switch and receptacle mounting, and cover plates in outlet boxes, and the Metallics JSRM50 is a 6-32 x 3/8 in. round head slotted screw in 18-8 stainless. At 3/8 in. of length it suits shallow tapped holes and plaster ears rather than deep stack-ups; if you are shimming a device out from a recessed box you will need a longer 6-32. The round head stands proud rather than sitting flush, so it is not a substitute for a flat head in a countersunk hole.

6-32 is a machine screw thread at 32 threads per inch, so the JSRM50 threads into any tapped 6-32 hole, a 6-32 nut, or a 6-32 insert. These are not self-tapping and will not cut their own thread in sheet metal or plastic, so the hole has to already be tapped or you need a mating nut.

18-8 stainless is the austenitic 300-series grade used where plated steel would rust, so it holds up in damp, outdoor, and washdown locations far better than zinc-plated hardware. Metallics lists the JSRM50 for the electrical, plumbing, heating and air conditioning trades. For chloride-heavy coastal or pool chemical exposure, 316 is the step up from 18-8.

Metallics rates the JSRM50 at 80,000 psi minimum tensile with a hardness of Rockwell B85 to B95. Metallics notes that tensile values for stainless screws are approximations only, since there is no single performance standard for stainless machine screws. That puts them in the range of ordinary low-carbon steel fasteners, not a hardened grade, so treat them as a corrosion choice rather than a strength upgrade. Do not substitute them where a drawing calls out a graded steel screw.

The head measures 0.24 to 0.26 in. across and 0.091 to 0.103 in. high. That is roughly a quarter inch of bearing surface on a 6-32 screw, so it will bridge a slightly enlarged or slotted hole, but for a badly oversized hole you want a washer or a fender washer under the head. The domed round profile also means it will not sit flush in a countersink.

No. Metallics lists the JSRM50 as not Buy American compliant and not ARRA compliant, with multiple countries of origin. For a project with domestic sourcing requirements you need a fastener with a stated domestic origin.

The JSRM50 comes in a jar of 100 pieces, and 100 is the order minimum, so you buy by the jar rather than by the piece. The jar weighs 0.24 lbs. Metallics offers other sizes and quantities by request.