Metallics JFMP631SS Screw 6-32 x 1 FL PH MS 316-SS (Jar 100)

It's a 6-32 x 1 inch machine screw, so a #6 diameter with 32 threads per inch and a 1 inch length. Standard 6-32 is the thread you'll find on most electrical device boxes, cover plates and wiring device mounting holes, and the 1 inch length gives extra reach where a plaster ring or thick plate stacks up behind the device.

These are 316 stainless steel. Type 316 adds molybdenum over 304, which is why it's the grade specified for coastal, marine and chemical-exposure work where chlorides attack plated or 304 fasteners. For exterior boxes, wash-down areas, pool and dock equipment, or anything near salt air, 316 is the right choice over a zinc-plated machine screw.

Flat head with a Phillips recess. The flat head is meant to sit in a countersunk hole so it finishes flush, which matters on cover plates, device straps and panel work where a protruding head would interfere. Drive it with a Phillips bit, typically a #1 or #2 at this screw size.

100 screws, supplied in a jar. The jar pack is the usual MRO format for small fasteners, it keeps the count contained on a van shelf or in a job cart rather than loose in a bag, and 100 pieces covers a trim-out run without reordering.

Only where the hole is countersunk. A flat head needs a tapered seat to pull flush; drop it into a flat-bottom hole and it will sit proud and may not clamp evenly. Cover plates with chamfered screw holes and countersunk panel or strap work are where the JFMP631SS belongs. If your plate holes are flat, specify a round or pan head 6-32 of the same length instead.

This is a machine screw, not a self-tapping or sheet metal screw. It needs an existing 6-32 tapped hole or a nut. Device boxes, mounting straps and plaster rings normally come with 6-32 threads already, so it drops straight in; in bare sheet metal you'd tap the hole first or use a nut and washer on the back side.

Worth thinking about. Stainless against aluminum in a wet or salty environment sets up a galvanic couple and the aluminum is the part that corrodes. For a few small screws into a large aluminum enclosure the effect is usually minor, but in direct salt exposure an isolating washer or an anti-seize helps. Stainless and galvanized steel pair acceptably in most construction work.

JFMP631SS is the Metallics part number, and it is also the MPN to quote. Ask for it by that number if you're matching a prior order or standardizing a fastener bin, since the adjacent Metallics numbers cover other lengths and head styles in the same 6-32 family.