Metallics JSRM30P 1/4-20 x 1/2 in. Round Head Phillips Machine Screws - 18-8 Stainless - Each

The JSRM30P ships as a jar of 100 screws, and 100 is the order minimum. Packed weight is 1.02 lbs for the jar.

The JSRM30P is cut 1/4-20, meaning 20 threads per inch on a 1/4 inch diameter, so it mates with any 1/4-20 tapped hole or nut. At 1/2 inch of length under the head, it is sized for thin sheet metal enclosures and bracket work; if you are going through a thicker stack or a channel nut with spacers, you will need a longer screw.

No. The JSRM30P is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. On federally funded work with domestic sourcing clauses, you will need a domestically produced fastener instead.

Use a #3 Phillips bit. The recess on these 1/4-20 screws runs 0.255 to 0.268 inch in diameter and 0.121 to 0.147 inch deep, which is larger than a #2 bit seats in properly. Driving them with a #2 is the usual reason the recess cams out.

They are 18-8 stainless, the common austenitic grade used for general corrosion resistance in wet and outdoor work. That makes them a reasonable choice for exterior enclosures, damp mechanical rooms, and washdown areas where plated steel would rust out.

Minimum tensile strength is 80,000 psi, with hardness at Rockwell B85 to B95. Worth knowing: there is no single performance standard for stainless machine screws, so stainless tensile figures are approximations. For structural or high-torque clamping you want a graded carbon steel fastener; stainless like this is chosen for corrosion resistance and non-magnetic behavior, not maximum strength.

Metallics lists them for electrical, plumbing, heating and air conditioning work. Typical use is mounting devices, straps, brackets and covers to tapped holes or nuts in panels and enclosures where you need a stainless fastener and the head can sit proud.