Metallics JRM41 8-32 x 1/4 in. Round Head Combo Machine Screws - Steel Zinc - Each

The JRM41 is an 8-32 round head combo machine screw at 1/4 inch long, which is the standard thread for electrical device and box hardware. At 1/4 inch it is short, so it suits shallow tapped holes such as strap, bracket and plate attachment where a longer screw would bottom out or run past the tapped depth. If you need to pull a device through plaster ears or spacers, you need a longer 8-32 screw instead.

Combo means both drives are cut into the same head, so you can run it with a flat blade or a Phillips. The recess takes a #2 Phillips driver. On a screw gun the Phillips gives you better stick; the slot is there for a cabinet tip screwdriver in tight panel work.

These 8-32 round head combo screws come in a jar, with a minimum order of 100 count. Jar packaging suits a van stock or a shop bench bin rather than a single-screw pick.

The JRM41 is steel with a zinc finish, made from AISI 1006 to 1022 low carbon steel. Zinc plating is a mild corrosion coating meant for dry indoor use. For wet locations, exterior enclosures or coastal air, use a stainless machine screw instead.

The record flags the JRM41 as ARRA compliant and Buy American compliant, with country of origin China. If your specification requires domestic melt and manufacture, confirm the compliance basis with your contracting officer before submitting.

Minimum tensile strength is 60,000 psi with a hardness of Rockwell B70 to B100. That is standard low carbon steel machine screw territory, fine for device mounting, bracket and enclosure hardware. It is not a structural or high tensile grade fastener.

The Phillips recess on the JRM41 measures 0.165 to 0.178 in. diameter with a depth of 0.075 to 0.101 in. and gaging penetration of 0.064 to 0.090 in. That is a proper #2 recess, so a fresh #2 tip seats fully. The slot alternative measures 0.045 to 0.054 in. wide and 0.058 to 0.077 in. deep if you would rather drive it with a flat blade.