Metallics JRM108SLT 8-32 x 3-1/2 in. Round Head Slotted Machine Screws - Steel Zinc - Each

The JRM108SLT is carbon steel with a zinc plated finish, made from AISI 1006 to 1022 steel. Zinc plating is a mild indoor corrosion coating, so it suits dry interior work, panel and device mounting, and boxes in conditioned space. For wet locations, exterior enclosures, or coastal exposure, specify a stainless 8-32 machine screw instead.

The record lists the JRM108SLT as compliant for both ARRA and Buy American, with country of origin China. On federally funded work where domestic sourcing is enforced by contract clause rather than the ARRA designation, confirm the requirement against your project specification before you commit to the submittal.

For a flush mounted switch or receptacle in a standard box, 3-1/2 inches is far longer than needed, and the excess thread will bottom out or stick out past the yoke. This length is for the cases where the device sits well forward of the box: stacked extension rings, deep mud rings, thick tile or stone finishes, or spacing a bracket off a panel. For ordinary device mounting, order a shorter 8-32 screw from the same Metallics JRM round head slotted line.

No. It has a round head, which seats on top of the surface rather than pulling flush, so no countersink is needed. Head width runs 0.287 to 0.309 in. and head height 0.107 to 0.12 in., so it covers an oversized or slightly elongated mounting hole. If you need the head flush with the plate or bracket, use a flat head screw instead.

They are sold by the jar, with a 100-count minimum order quantity. Jar weight is listed at 1.74 lbs. Metallics notes other sizes and quantities are available by request.

Minimum tensile strength is 60,000 psi, with a hardness of Rockwell B70 to B100. That is standard low carbon steel machine screw strength, fine for mounting devices, plates, brackets, and enclosure hardware. It is not a structural or high strength fastener, so do not substitute it where a graded bolt is called out on the drawing.