Metallics JRM94 10-24 x 1-1/4 in. Round Head Combo Machine Screws - Steel Zinc - Each

Either one. The JRM94 head is a combo drive, slotted and Phillips in the same head, so whatever is in your pouch works. Phillips side takes a #2 driver. The slot runs 0.050 to 0.060 inch wide and 0.065 to 0.087 inch deep, so a standard cabinet-tip flat blade seats properly.

No. The JRM94 is not Buy American compliant and is not ARRA compliant, with multiple countries of origin. On a federally funded project with domestic sourcing requirements you will need a domestic fastener line instead.

The round head measures 0.334 to 0.359 inch across and sits 0.123 to 0.137 inch high. That is a domed profile that sits on top of the material, not flush, so it will foul a flat cover plate that lands directly over the screw. For a flush condition you want a flat or oval head instead; for box and bracket mounting under a plate with relief, the round head is fine.

These ship 100 to a jar, and the jar is the order minimum, so 100 pieces is the smallest quantity. The packed jar weighs 0.95 lbs.

Zinc plating on carbon steel is a mild corrosion coating, suited to dry interior electrical, plumbing and HVAC work. In wet, exterior or washdown locations the plating will eventually rust through, so specify stainless for those openings. The JRM94 is steel with a zinc finish.

Minimum tensile strength is 60,000 psi, made from AISI 1006 to 1022 low carbon steel with a hardness of Rockwell B70 to B100. That is standard commercial machine screw strength, fine for mounting boxes, straps, brackets and device hardware, but not a substitute for a graded cap screw in a structural or high-load connection.

Machine screws are supplied as screws only, no nuts or washers. The JRM94 needs either a tapped 10-24 hole (as found in a steel box or device ring) or a separate 10-24 nut. If you are fastening into sheet metal with no threads, order nuts or use a self-tapping screw instead.

The Phillips recess is held to 0.182 to 0.195 inch diameter with a recess depth of 0.093 to 0.119 inch and a gaging penetration of 0.082 to 0.108 inch, so a #2 point seats to full depth. Combo heads do have a slot cut through the recess, which removes some bearing surface, so run a driver rather than an impact and keep the bit straight.