Metallics JMFM350 Screw M3 (0.5) x 50mm Flat Head Slot (Jar 100)

It's an M3 metric machine screw with a 0.5 mm thread pitch and a 50 mm length, with a flat head driven by a straight slot. M3 x 0.5 is the standard coarse pitch for M3, so it mates with standard M3 nuts and M3 tapped holes.

It's a straight machine screw. M3 (0.5) is a machine thread, so it goes into an M3 tapped hole or takes an M3 nut. It will not cut its own thread in untapped metal, so you need either a pre-tapped hole, a nut on the back side, or a drilled hole tapped to M3 x 0.5.

100 screws per jar. The jar pack keeps loose metric hardware contained on a service truck or in a parts bin, which is why Metallics sells these fasteners this way rather than loose by weight.

A flat head screw has a tapered underside and only sits flush if the hole is countersunk or the part has a chamfered seat for it. On sheet metal or a flat plate with a plain drilled hole, the JMFM350 head will stand proud. If you need a flush result in unprepared material, pick a pan or round head instead and accept the raised head, or countersink the hole first.

Metallics catalogues these M3 screws as electrical fasteners, and the long 50 mm shank is what you reach for when the screw has to pass through a deep stack: a device or fixture bracket plus spacers, a luminaire canopy, or imported gear built to metric hardware. On metric-threaded equipment where the original screw is too short after adding a gasket or spacer, the 50 mm length gives you the extra reach without changing the thread.

A flat blade (slotted) screwdriver. The head is slotted, not Phillips, Torx or square drive, so a bit driver loaded with cross-point bits won't engage it. On an M3 head the slot is narrow, so use a small cabinet-tip flat blade to avoid camming out of it.

JMFM350 is the Metallics part number, covering the M3 (0.5) x 50 mm slotted flat head screw supplied 100 to a jar. That's the number to quote when ordering or cross-referencing.