Metallics JSRM60 8-32 x 3/8 in. Round Head Slotted Machine Screws - 18-8 Stainless - Each

8-32 is the standard thread for receptacle and switch mounting in outlet boxes, and the Metallics JSRM60 is an 8-32 x 3/8 in. round head slotted screw in 18-8 stainless, listed for electrical, plumbing, and HVAC work. At 3/8 in. of length it suits shallow tapped holes and strap mounting rather than deep pulls. The round head stands proud of the surface, so if you need the head to sit flush in a countersunk plate, use a flat head instead.

18-8 stainless is the corrosion-resistant choice for wet and damp locations, which is where it earns its place over plain zinc-plated steel. The tradeoff is strength: stainless machine screws are rated at 80,000 psi minimum tensile with a hardness of Rockwell B85-B95, softer than a hardened carbon steel screw, and Metallics states the tensile figure as an approximation because there is no single performance standard for stainless machine screws.

No. The JSRM60 is 8-32, which is 32 threads per inch on a #8 diameter. A 10-32 tapped hole shares the same 32 TPI but is a larger diameter, so an 8-32 screw will spin loose in it. Grounding lugs in boxes are typically 10-32, while device mounting holes are 8-32, so check which hole you are filling before you order.

No. The JSRM60 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. For a federal or ARRA-funded project that enforces domestic sourcing on fasteners, you will need a domestically produced 8-32 stainless screw instead.

It is a single slotted drive, not Phillips. Slot width runs 0.045 to 0.054 in. and slot depth 0.058 to 0.077 in., so a standard flat blade tip in the 0.045 in. range seats properly. An oversized blade will ride on the shoulders of the slot and cam out.

The head measures 0.287 to 0.309 in. across and 0.107 to 0.12 in. high on the Metallics 8-32 round head screw. That matters when the screw lands next to a raised ring, a device yoke, or a crowded wiring gutter, since a round head domes above the surface instead of sinking into it.

A machine screw has a uniform straight thread, 32 TPI here, and needs a pre-tapped hole or a nut to work. It does not form its own thread. Use the Metallics SRM series 8-32 where the hole is already tapped, such as a device strap or a tapped bracket. If you are driving into unthreaded sheet metal with no nut behind it, a self-tapping or sheet metal screw is the correct part.

They come in a jar of 100 pieces, and 100 is the order minimum. Shipping weight on the jar is 0.35 lbs. Metallics notes that other sizes and quantities are available by request.