Metallics JSRM24 10-24 x 1-1/4 in. Round Head Slotted Machine Screws - 18-8 Stainless - Each

18-8 stainless is an austenitic chrome-nickel alloy that resists rust in wet and outdoor exposure, which is why these are specified for exterior boxes, damp-location fixtures, and mechanical rooms rather than plated steel screws that bloom rust. The screw body runs Rockwell B85-B95 hardness with a minimum tensile strength of 80,000 psi. Note that tensile figures for stainless machine screws are approximations; there is no single performance standard for them.

These ship as a jar of 100. The order minimum is 100 pieces in jar packaging, so the smallest quantity you can buy is one full jar.

No. The Metallics JSRM24 stainless machine screws are not Buy American compliant and are not ARRA compliant, with origin listed as multiple countries. If your federal, state, or institutional contract carries a domestic sourcing clause, these will not satisfy it.

It stands proud. A round head is a domed bearing head, not a countersunk one, so it seats on top of the material rather than sinking into it. Head height is 0.123 to 0.137 inch and head width is 0.334 to 0.359 inch, which is the clearance you need to allow above the hole. If you need the fastener to finish flush in a chamfered hole, you want a flat head screw instead.

They are catalogued for the electrical, plumbing, heating and air conditioning trades, so the same jar covers device and box hardware, strap and hanger work, and sheet metal duct accessory fastening where a machined thread is being used rather than a self-tapper. A 10-24 machine screw needs a tapped hole or a nut on the back side; it will not cut its own thread in sheet metal.

The material is specified to SAE, and the screw is dimensioned as a round head slotted machine screw in the Metallics SRM series. Head, slot, and gaging dimensions are given as ranges (head width 0.334 to 0.359 inch, recess penetration gaging depth 0.082 to 0.108 inch), which is how machine screw tolerances are published.