Metallics JFM48SS 10-32 x 3/4 in. Flat Head Slotted Machine Screws - 18-8 Stainless - Each

That is what the flat head is for. The JFM48SS has a flat head measuring 0.333 to 0.362 in. across with a head height of 0.098 to 0.116 in., so it seats down into an 82-degree countersink and finishes flush with the surface. If your plate or bracket has a plain, non-countersunk hole, a flat head will not sit flush and you want a pan or round head instead.

18-8 stainless is specified for general atmospheric corrosion resistance, so it holds up in damp, washdown, and exterior-exposed work where plated steel would rust at the head. It is also the material called for in food processing machinery and refrigeration equipment. For heavy chloride or coastal salt spray exposure, 316 stainless is the stronger choice; 18-8 is a general-purpose austenitic grade.

No. The JFM48SS is marked not Buy American compliant and not ARRA compliant, with country of origin listed as multiple. If your spec carries a domestic-sourcing requirement, these will not satisfy it and you need a documented US-made fastener.

They ship 100 to a jar, and 100 is the order minimum. So one unit is a jar of 100 of the 10-32 x 3/4 in. flat head stainless screws rather than a single loose fastener.

Dimensionally they are built to ASME B18.6.3-1998 for slotted flat head machine screws, with threads to ANSI/ASME B1.1 and SAE material designation. Note the hardness of Rockwell B85-B95 and the 1200 lb minimum tensile are published as guides only, since there is no national performance standard for stainless machine screws.

A flat blade. The drive is a single slot, 0.05 to 0.06 in. wide and 0.034 to 0.053 in. deep, so a cabinet-tip screwdriver or a slotted power bit sized to that width is what you want. A blade that is too thick rides out of the slot and a Phillips bit will not engage at all.

Stainless holds strength better than plated steel through a rise in operating temperature, which is part of why 18-8 gets used around refrigeration and process equipment. Rated hardness is Rockwell B85-B95 with a 1200 lb minimum tensile, but treat both as guide figures rather than a qualified performance rating.

They are stocked for electrical, plumbing, and HVAC work, which is where 10-32 threads and stainless corrosion resistance come up most: device and cover mounting, panel and enclosure hardware, equipment brackets, and refrigeration or food-processing machinery. For maintenance crews it is a jar to keep on the truck for anything with a countersunk 10-32 hole.