Metallics JFM107 10-24 x 1-3/4 in. Flat Head Slotted Machine Screws - Steel Zinc - Each

The Metallics JFM107 is a 10-24 screw with 24 threads per inch in a UNC coarse thread made to ANSI/ASME B1.1, which is the same 10-24 thread used on outlet box and device mounting holes. The 1-3/4 inch length is the long option, so it is the one to reach through thick plaster rings, mud rings, or stacked spacers rather than a flush box.

Flat head means a countersunk head that seats flush in a chamfered or countersunk hole, not on a flat surface. Head width runs 0.333 to 0.362 inch and head height 0.098 to 0.116 inch, dimensioned to ASME B18.6.3-1998. If the hole you are driving into is not countersunk, you want a pan or round head instead, since a flat head will only bear on the hole edge.

The JFM107 is carbon steel with a zinc finish, made from AISI 1006-1022 steel. Zinc plating is a dry-location and indoor-grade coating; it will corrode in standing moisture, salt air, or washdown areas. For wet or corrosive locations, specify a stainless steel machine screw in the same 10-24 x 1-3/4 size instead.

They ship 100 to a jar, and 100 count is the order minimum. The jar weighs 1.28 lbs. Other sizes and quantities are available by request.

Slotted drive, so a flat blade. The slot is 0.05 to 0.06 inch wide and 0.034 to 0.053 inch deep, so a thin cabinet-tip flat screwdriver seats properly; a wide fat-blade tip will ride out and chew the slot. There is no Phillips or combo recess on this screw.

The record shows the JFM107 flagged as both ARRA compliant and Buy American compliant, with country of origin China. If your contract documents require domestic melt and manufacture rather than ARRA-style compliance, treat those two flags as separate questions and match them against the exact clause in your spec.

A machine screw like the JFM107 has a uniform straight UNC thread with no point, so it needs an existing tapped hole or a nut to thread into. That is why it works for box and device mounting, panel assembly, and fixture hardware. If you are driving into unthreaded sheet metal or a pilot hole with no threads, you need a sheet metal or self-tapping screw instead, because this one will not form its own thread.