Metallics JSRM23P 10-24 x 1 in. Round Head Phillips Machine Screws - 18-8 Stainless - Each

18-8 stainless is the standard corrosion-resistant austenitic grade, so it holds up in wet, damp and exterior locations where a plated steel screw rusts and seizes. Hardness runs Rockwell B85-B95 with a tensile strength of 80,000 psi minimum. Metallics notes that tensile values for stainless screws are approximations, since there is no single performance standard for stainless machine screws, so don't spec these where a graded structural fastener is called for.

Round head sits proud of the surface with a domed crown, not flush. Head width is 0.334 to 0.359 in. and head height 0.123 to 0.137 in., so figure roughly a third of an inch of bearing diameter and an eighth of an inch standing above the work. If you need the head buried level with the surface, order a flat head machine screw cut for a countersunk hole instead.

No on both counts. The JSRM23P is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If your project carries domestic sourcing requirements, this part will not satisfy them.

They ship 100 to a jar, and the jar is the minimum order quantity. Total packed weight is 0.84 lbs.

A #2 Phillips. The recess is 0.182 to 0.195 in. in diameter with a 0.093 to 0.119 in. depth, so a #1 bit will cam out and a #3 will not seat. Keep a #2 in the driver and set your clutch low on stainless, which galls if you overdrive it.

No. The JSRM23P is the screw only, 100 to a jar. A machine screw has no self-tapping point, so it needs either a tapped hole or a mating 10-24 nut. Add 10-24 machine screw nuts separately if the hole in your part is not already threaded.

10 is the screw gauge (the major thread diameter), 24 is the thread count at 24 threads per inch, and 1 in. is the shank length measured from under the round head, since round head screws are measured below the head rather than overall. The thread dimensions follow SAE as the material standard.