Metallics JRM104SLT 1/4-20 x 2 in. Round Head Slotted Machine Screws - Steel Zinc - Each

The JRM104SLT ships as a 100-count jar, and 100 is the order minimum, so it is sold by the jar rather than the piece. The packed jar weighs 2.5 lbs.

Yes. The JRM104SLT is a 1/4-20 machine screw, 20 threads per inch on a 1/4 inch diameter, which is the standard UNC coarse 1/4 inch thread used in device boxes, nuts and tapped straps. Overall length under the head is 2 inches.

The round head on this Metallics screw measures 0.443 to 0.472 in. across and stands 0.16 to 0.175 in. above the surface. That is a domed, raised head, so it will not sit flush in a countersunk hole. If you need the head buried in a plate or flush with the face, go with a flat head screw instead.

Metallics lists the JRM104SLT as both ARRA compliant and Buy American compliant. Country of origin is China. On a federally funded project, confirm which clause your contract is written under, since those two designations are applied differently depending on the spec.

It takes a flat blade. The slot is 0.064 to 0.075 in. wide and 0.082 to 0.109 in. deep, so a standard cabinet tip flat screwdriver or a slotted power bit seats fully. No Phillips or combo recess on this one.

These are carbon steel with a zinc plating, which handles indoor and protected locations fine but is not a marine or sustained wet environment finish. For exterior, wash down, or coastal work, specify a stainless machine screw instead.

Rated at 60,000 psi minimum tensile strength, with a hardness of Rockwell B70 to B100. The steel is AISI 1006 to 1022 low carbon. That is general purpose fastener strength, comparable to a commercial grade machine screw, not an alloy cap screw. For structural or high load connections, move up to a graded hex cap screw.

No. A 1/4-20 machine screw has uniform straight machine threads and needs a nut or a pre tapped hole to work. It will not cut its own thread in sheet metal or hold in wood. Use a self tapping or sheet metal screw for untapped metal, and a wood screw or lag for timber. Where this 2 inch length earns its keep is through a thick assembly into a tapped strap, channel nut, or a nut on the back side.

For typical device and fixture mounting, yes, 2 inches is on the long side. The JRM104SLT is the length you reach for when stacking through extension rings, plaster rings, or thick fixture canopies where a short screw bottoms out. If you only need to catch a tapped yoke behind a plate, a shorter 1/4-20 round head slotted screw from the same JRM series is the better pick. Metallics lists other lengths and pack counts in this line.