Metallics JFM142SS 6-32 x 3 in. Flat Head Slotted Machine Screws - 18-8 Stainless - Each

The Metallics JFM142SS is a 6-32 UNC screw with 32 threads per inch, cut to ANSI/ASME B1.1. That is the same 6-32 thread used on device yokes, box ears and cover plates, so it mates with standard 6-32 tapped holes. The 3 inch length is the long version, meant for reaching a device back through deep mud rings or thick wall build-ups rather than flush box mounting.

That is the reason to buy them. The JFM142SS is 18-8 stainless, specified for general atmospheric corrosion resistance and used on food processing machinery and refrigeration equipment. Stainless also holds its strength better than plain steel when the application runs warm. For dry interior work, a plated steel screw does the same mechanical job.

550 lb minimum tensile, with a hardness of Rockwell B85 to B95. Worth knowing: there is no national performance standard for stainless machine screws, so those figures are published as a guide rather than a certified grade. If your drawing calls out a graded fastener, a stainless machine screw will not satisfy it.

No. The JFM142SS is not Buy American compliant and is not ARRA compliant; country of origin is listed as multiple. On a federally funded project with domestic sourcing language, these will not pass submittal.

Slotted drive, so a flat blade screwdriver. The slot runs 0.039 to 0.048 inch wide and 0.024 to 0.038 inch deep, which suits a #6-size cabinet tip. Slotted heads in stainless do not take a lot of torque from a power driver without chewing the slot, so hand driving or a low-clutch setting is the sensible approach.

They come in a jar, with a minimum of 100 count. That is a shop or truck-stock quantity rather than a handful, which is how most electrical contractors buy 6-32 screws. Other sizes and quantities in the Metallics FM and FMP machine screw series can be had by request.