Metallics JFM92 10-32 x 1-1/2 in. Flat Head Slotted Machine Screws - Steel Zinc - Each

Head, slot and thread dimensions conform to ASME B18.6.3-1998 with threads to ANSI/ASME B1.1. For federally funded work, note the JFM92 is not Buy American compliant and is not ARRA compliant; country of origin is listed as multiple. If your project carries domestic sourcing requirements, you will need a domestically produced fastener instead.

It ships as a jar of 100 screws, with 100 as the order minimum. The jar weighs 1.04 lbs. If you need a count other than 100, Metallics lists other sizes and quantities in the FM and FMP series by request.

The drive is a single slot, 0.05 to 0.06 in. wide and 0.034 to 0.053 in. deep. A slot that shallow has no self-centering, so a cordless driver tends to cam out and chew the head. Use a properly sized flat-blade screwdriver by hand, or a slow-speed driver with light pressure. If you want to run them with a drill all day, a Phillips or combo head screw is the better pick.

Zinc plating over carbon steel is a mild corrosion coating meant for dry indoor service. In wet, exterior, or washdown locations the plating sacrifices and the steel underneath will rust, so specify stainless instead. Note that Metallics states hardness and tensile figures for stainless machine screws are guides only, since there is no national standard for those performance requirements on stainless.

A machine screw has a uniform straight thread, here 10-32 UNF, and needs a pre-threaded hole or a nut to pull against. It will not cut its own thread. If you are fastening into bare sheet steel with no tapped hole, you want a self-drilling or sheet metal screw, or you tap the hole first. The JFM92's 1-1/2 in. length gives you room for a nut and washer on the back side.