Metallics JFMP86SS 8-32 x 1 in. Flat Head Phillips Machine Screws - 18-8 Stainless - Each

8-32 is the standard thread used on outlet boxes, device straps and cover plates, and the Metallics JFMP86SS is an 8-32 UNC screw cut to the ANSI/ASME B1.1 thread standard at 32 threads per inch, so it mates with any 8-32 tapped hole. At 1 inch long it is longer than typical plate screws, which makes it useful where you are reaching through a mud ring, extension or thick finish material.

Flat head means it seats flush in a countersunk or chamfered hole rather than standing proud. The head measures 0.285 to 0.312 in. across with a head height of 0.084 to 0.1 in., both to ASME B18.6.3-1998, so an 82 degree countersink sized for a #8 flat head takes it level with the surface. Into a flat untapered hole the head will stand up about a tenth of an inch.

18-8 stainless is specified for general atmospheric corrosion resistance, and is commonly used in food processing machinery and refrigeration equipment, so damp interiors, washdown areas and sheltered exterior work are within its range. It also holds its strength better than plain steel as operating temperature rises. For continuous salt spray or marine immersion, 316 is the grade to look for instead.

Machine screws are not self-tapping. The JFMP86SS has a blunt, fully threaded 8-32 machine thread meant for a pre-tapped hole or a nut, so it will not cut its own thread in sheet metal, wood or board. For unthreaded sheet metal use a self-drilling or sheet metal screw; for a through hole without threads, pair this screw with an 8-32 nut.

A #2 Phillips. The recess is 0.182 in. in diameter and 0.11 in. deep, so a #2 bit fills it properly; a #1 will cam out and chew the recess, which matters more with stainless than with plated steel because the softer stainless head damages easily.

850 lb minimum tensile with a hardness of Rockwell B85-B95 to SAE material standard. Worth knowing before you spec it for anything structural: there is no national performance standard for stainless machine screws, so the hardness and tensile figures are guides rather than a graded rating. For a load-rated fastener, a graded steel screw with a published grade marking is the better call.

They come in a jar of 100, which is the order minimum. The jar weighs 0.56 lbs. That packaging suits a service van or shop bin rather than a bulk production run.

The JFMP86SS is flagged as both ARRA compliant and Buy American compliant in Metallics' own data, with country of origin listed as China. On a federally funded project where domestic-origin fastener content is being enforced, review that pairing against your contract language before you submit it.

The FM and FMP series covers additional sizes and quantities on request, so a facility that standardizes on 8-32 stainless flat head can carry several lengths off the same series. The JFMP86SS itself is fixed at 8-32 x 1 in.