Wholesale DIN 916 Allen Drive Set Screws with Cup Point for Electronic and Machinery Use

Hardness runs HRC 40-53 depending on the grade and, and 45H is the standdard we work from for most orders—it gives a good balance for both stainless A2/A4 and alloy steel. These are cup point set screws, DIN 916, so that hex socket drive and the sharp edge on the point is what digs in to resist loosening under vibration in machinery mounts or electronic chassis.

The cup point works better than a flat or cone point if you’re trying to secure something against axial movement without marring a shaft surfce too badly, but it will still leave a mark. We see these most often in automotive sub-assemblies where a flush fit is needed and there’s no room for a head, but they’re also common in electronics for trim pots or adjustment mechanisms where you’re torquing into a soft metal.

Sizes run from M3 up to M20, though the M12 and M16 sizes are what move fastest—everyone wants those for jig and fixture work. M3 is tiny, and you’ll need a small hex key, probably 1.5mm or 2mm, so don’t lose it; we usually have stock, but confirm lead time on the M20 or off-spec lengths like 40mm or 50mm.

Surface treatment is zinc plated, and you can choose black, white, or yellow—most buyers go with yellow for corrosion resistance in outdoor gear or white for cleaner appearance in electronics enclosures. The coating isn’t thick, maybe 5-8 microns, so it won’t mess with thread fit on the M3 sizes (check your tolerance, though). Alloy steel gets the HRC 45+, stainless A2 is usually softer at HRC 40-45, fine for most applications but not if you’re torquing into hardened steel.

The HS code is 731815, which covers set screws, and that matters for customs if you’re shippng internationally—we export a lot to machinery rebuild shops and automotive tier-2 supliers, typically in bulk packs of 1000 or more with the MOQ around 500 pieces per size. Packaging is usually poly bags in boxes, but our company can do small blister packs for retail if you’re a distributor.

And we’ve handled batches where the cup point was too blunt—basically, the forming die wore out—so check your COA on hardness and point profile if you need them for a critical jig. We test every run with an optical comparator, but we don’t always retorque to spec unless you ask.