Metallics JRM132SLT 1/4-20 x 4 in. Round Head Slotted Machine Screws - Steel Zinc - Each

The JRM132SLT is flagged as both ARRA compliant and Buy American compliant in the manufacturer data, with country of origin listed as China. On a federally funded project, confirm which standard your specification is written to, since the compliance flag and the origin are both part of the record.

Minimum tensile strength is 60,000 psi, with a hardness of Rockwell B70 to B100, made from low carbon steel in the AISI 1006 to 1022 range. That is standard low carbon machine screw strength, suitable for fixture mounting, device and box work, and general assembly, not for high strength structural bolting where a graded cap screw is called for.

The material is steel with a zinc finish, which is a plated coating for indoor and protected use. Zinc plating gives moderate corrosion resistance but will eventually rust in wet, coastal, or chemically exposed locations. For those, use a stainless machine screw instead.

They come in a jar of 100, which is the order minimum (100 count). The jar of 100 weighs 4.53 lbs. Smaller counts are not broken out for this item.

A 1/4-20 x 4 inch length is meant for stacked or deep assemblies, such as running through a fixture canopy, a layer of blocking, and into a strap or nut on the far side. The threads run the usable length and the round head bears on the surface rather than countersinking, so measure your total grip thickness and leave enough thread engagement past it for the nut or tapped hole.