Metallics JSRM31 1/4-20 x 3/4 in. Round Head Slotted Machine Screws - 18-8 Stainless - Each

The JSRM31 ships as a jar of 100 screws, and 100 is the order minimum. The jar itself weighs 1.29 lbs. If you need a different size or a different count, Metallics offers other sizes and quantities by request.

1/4-20 is a coarse UNC machine thread at 20 threads per inch, so it mates with any 1/4-20 tapped hole or 1/4-20 nut. It will not go into the 8-32, 10-32 or 10-24 holes used for most device mounting and box ground screws, so check the tapped size before you buy. The JSRM31 is a straight machine screw, not a self-tapping screw, so the hole must already be threaded or you need a matching nut.

No. The JSRM31 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. On a federally funded project with domestic sourcing requirements, you need a domestically produced fastener instead.

Tensile strength is listed at 80,000 psi minimum with a hardness of Rockwell B85-B95. Metallics notes that tensile values for stainless screws are approximations only, since there is no single performance standard for stainless machine screws. Stainless also galls when overtightened against a stainless nut, so run them snug rather than leaning on them.

No. The jar holds 100 screws only. Machine screws have no point and do not cut their own thread, so unless you are driving into an already tapped hole you will need matching 1/4-20 nuts, and flat or lock washers if the joint calls for them.

The drive is a single slot, 0.064 to 0.075 in. wide and 0.082 to 0.109 in. deep, so it takes a flat blade that matches that width. Slotted heads cam out easily under power, so hand driving or a low speed clutch setting is the practical way to run them.