Metallics JPMP41 10-24 x 1-1/2 in. Pan Head Phillips Machine Screws - Steel Zinc - Each

Yes. The Metallics JPMP41 is a 10-24 UNC machine screw, which is the thread used for outlet box, device, and plaster ring mounting holes in US electrical work. Thread count is 24 per inch and the thread form is UNC, so it runs into tapped 10-24 box ears and mounting straps without a nut.

For a straight device-to-box mount, 1-1/2 inches of length is more than you need and the extra thread will bottom out or stick past the ear. The JPMP41 length is meant for stacked situations: mounting through a thick plaster ring, spacers, extension rings, or a fixture canopy where you have to reach a long way back to the tapped hole. For flush device work, a shorter 10-24 is the better call.

No. A machine screw has a uniform straight UNC thread with no point, so it needs a tapped hole or a nut, which is exactly how electrical boxes, straps and fixture canopies are built. Driving the JPMP41 into drywall, a stud, or an untapped sheet metal hole will not hold. For those, use a tapping or sheet metal screw instead.

A #2 Phillips bit. The recess diameter is 0.192 inch with a gaging depth of 0.089 to 0.113 inch, which is standard #2 geometry, so a worn or undersized bit is the usual cause of cam-out on these.

Head width runs 0.357 to 0.373 inch and head height 0.122 to 0.133 inch. That is a low, rounded profile that seats flat without countersinking, so it clears cover plates and trim rings but will not sit flush in a countersunk hole. If you need flush, specify a flat head instead of pan.

The JPMP41 is zinc plated carbon steel, which is a dry-location, indoor plating. It handles normal interior humidity but will rust in weather-exposed, wet, or washdown areas. For those, use a stainless machine screw in the same 10-24 x 1-1/2 size.

Dimensions conform to ASME B18.6.3-2010, the standard for inch series machine screws and tapping screws. Material is to AISI 1006-1022. Those two citations plus the 10-24 UNC thread call-out are what a spec reviewer is looking for on a fastener submittal.

Metallics lists the JPMP41 as both Buy American compliant and ARRA compliant. Country of origin is recorded as multiple, so if a federal or publicly funded job requires origin documentation on the specific lot, request it with the order.

Minimum tensile strength is 60,000 psi, with hardness in the Rockwell B70 to B100 range, made from AISI 1006-1022 low carbon steel. That is standard commercial machine screw strength, fine for mounting devices, straps, boxes and fixtures. It is not a structural or high strength grade fastener.

They ship in a jar of 100, and 100 count is the order minimum, so the smallest purchase is one full jar. Jar packaging suits a van stock or shop bin rather than a single repair. Jar weight is 1.14 lbs.