Metallics JPMP39 10-24 x 1/2 in. Pan Head Phillips Machine Screws - Steel Zinc - Each

Yes. The Metallics JPMP39 is a 10-24 UNC thread with 24 threads per inch, which is the standard tapped size used for mounting devices and covers to steel outlet boxes and plaster rings. At 1/2 inch long it suits the shallow tapped bosses on box ears, where a longer screw would bottom out or run out the back.

The JPMP39 is flagged both ARRA compliant and Buy American compliant in Metallics' data, which is what a government, school, or municipal submittal usually asks for on fasteners. Country of origin is listed as multiple.

Machine screws need an existing thread. The JPMP39 has a blunt, uniform 10-24 UNC machine thread, so it goes into a tapped hole or a nut, not into bare sheet metal. If you are fastening into unthreaded sheet, use a self-tapping or sheet metal screw instead.

A #2 Phillips bit. The recess is a Phillips with a 0.192 inch recess diameter and a gaging depth of 0.089 to 0.113 inch, so a #2 tip seats fully. A #1 will cam out and chew the recess; a #3 will not sit down in it.

The pan head measures 0.122 to 0.133 inch high and 0.357 to 0.373 inch across. That is a low, broad crown with a flat bearing surface, so it sits proud of the material rather than flush. If you need the head buried, you want a flat head screw for a countersunk hole, not this pan head.

ASME B18.6.3-2010 governs the head and recess dimensions, and the steel is AISI 1006 to 1022. That is the spec line to put on a submittal when the drawing calls for a standard pan head machine screw rather than a proprietary fastener.

The JPMP39 is zinc plated carbon steel. Zinc plating handles dry interior work (device boxes, panel covers, equipment mounting) but it is a sacrificial coating, not corrosion-proof, so for wet, washdown, coastal, or exterior-exposed locations a stainless machine screw is the right call. Note that tensile values for stainless machine screws are approximations only, since there is no single performance standard for them.

They ship in a jar of 100, and 100 count is the order minimum. Shipping weight on the jar is 0.58 lbs. Other sizes and quantities are available by request.

Minimum tensile strength is 60,000 psi, with hardness in the Rockwell B70 to B100 range. That is standard low-carbon machine screw strength, fine for mounting devices, covers, brackets, and enclosures. For a structural or high-load connection you would move to a graded bolt instead.