Metallics JSPMP1SS 8-32 x 1-1/2 in. Pan Head Phillips Machine Screws - 18-8 Stainless - Each

8-32 is the standard thread used for device and cover screws in outlet boxes, mounting rings and plaster rings, so the Metallics JSPMP1SS threads straight into that tapped hole. It runs 32 threads per inch and the vendor lists it for the electrical, plumbing, heating and air conditioning trades. At 1-1/2 in. of length it is far longer than a stock device screw, so it is the one you reach for when you are spanning a deep ring, a thick wallplate buildup, or pulling a device up through added drywall.

Yes. The JSPMP1SS is 18-8 stainless, the austenitic grade used for general corrosion resistance, so it holds up in wet locations, exterior boxes and coastal-adjacent work far better than a zinc-plated steel screw. One caution on mixed metals: pairing stainless fasteners with aluminum enclosures in a wet environment invites galvanic corrosion at the joint.

The screws are built to ASME B18.6.3-2010, the dimensional standard for inch-series machine screws, with material per SAE. That covers head and recess geometry, which is why the head width and #2 recess dimensions are called out. Note for publicly funded work: Metallics lists the JSPMP1SS as not Buy American compliant and not ARRA compliant, with country of origin reported as multiple.

A #2 Phillips bit. The recess diameter is 0.175 in. with a gaging depth of 0.071 to 0.097 in., which is standard #2 geometry, so a worn #1 will cam out and a #3 will not seat. Keep a fresh #2 in the driver if you are running a jar of these with an impact.

They come in a jar, with an order minimum of 100 per jar. So this is a bulk-pack item for a truck stock or a shop drawer, not a one-off pickup. The jar runs 0.86 lbs.

80,000 psi minimum. Worth knowing how to read that: Metallics states tensile values for stainless screws as approximations only, because there is no single performance standard for stainless machine screws the way there is for graded steel bolts. Hardness is given on the Rockwell BBS-B9S scale. If your drawing calls out a specific graded fastener class, a stainless machine screw is not a drop-in substitute for it.

A machine screw like the JSPMP1SS has a uniform 8-32 machine thread and a blunt end, so it needs an existing tapped hole or a nut. It will not cut its own thread. For an untapped hole in sheet metal or a stud, use a self-tapping or sheet metal screw instead. For a through-hole with a nut on the back, or a factory-tapped boss such as a box ear or strut fitting, the machine screw is correct.

Yes. Metallics offers other sizes and quantities in the SPMP pan head Phillips line by request. The JSPMP1SS itself is fixed at 8-32 x 1-1/2 in. in 18-8 stainless, one jar configuration, so if you need a shorter 8-32 for a flush device screw or a bigger pack, it is a different part number in the same series.