Metallics JSPM30SS 4-40 x 7/16 in. Pan Head Slotted Machine Screws - 18-8 Stainless - Each

No. Metallics JSPM30SS is a 4-40 thread with 40 threads per inch, which is a smaller thread than the 6-32 used for wiring device mounting and the 8-32 used for cover plates and box mounting in North American electrical work. Use it where the tapped hole is actually 4-40, such as small instrument covers, fixture trim, and control components. Ordering 6-32 or 8-32 instead is the fix if the hole is a device screw hole.

18-8 stainless is the austenitic 300-series grade used where corrosion resistance matters more than raw strength, so it holds up in damp interiors, exterior enclosures, and washdown areas far better than plain or zinc-plated steel. Tensile strength on these is listed at 80,000 psi minimum, and Metallics notes that stainless tensile values are approximations since there is no single performance standard for stainless machine screws. If you need a hardened, high-torque fastener instead of corrosion resistance, a plated alloy steel screw is the better pick.

Metallics lists the JSPM30SS as both ARRA compliant and Buy American compliant, with country of origin China. Procurement officers on federally funded work should take both of those designations as they are printed, since the two programs apply different tests. Dimensionally the screw is built to ASME B18.6.3-2010 with SAE material standard, which is what a submittal usually asks for on a machine screw.

The JSPM30SS is 7/16 in. long under the head, which covers a thin panel plus a tapped hole or a nut. Machine screws have a fully formed 4-40 thread with a blunt end, so they do not cut their own threads: the hole has to be tapped 4-40 already, or you pair the screw with a 4-40 nut. Nuts and washers are not included.

They ship 100 to a jar, and 100 count is the order minimum. The packed jar weighs 0.19 lbs. If you need a different size or a different count, Metallics offers other sizes and quantities by request.

For a facility standardizing hardware, the JSPM30SS gives you one line item: 4-40 x 7/16 in., pan head, slotted, 18-8 stainless, 100 per jar, built to ASME B18.6.3-2010 so head and thread geometry repeat jar to jar. Where openings or panels need other diameters or lengths, Metallics offers other sizes and quantities in the same SPM series by request, so the finish and material stay consistent across the set.

Order Metallics part JSPM30SS. That number covers the 4-40 x 7/16 in. pan head slotted machine screw in 18-8 stainless, packed 100 to a jar, in the Metallics SPM fastener series.