Metallics JRM96SB Screw 10-24 x 2 RH SL MS SBR (Jar 100)

Yes. Standard steel outlet, switch, and device boxes are tapped 10-24 at the ears, so a 10-24 machine screw like the JRM96SB threads straight in. The 2 inch length is for deep builds, for example where a device or fixture is being set out from the box through plaster rings, spacers, or thick trim; for a flush device a shorter screw is usually what you want.

It's a machine screw, not a sheet metal or wood screw. Machine screws have a uniform straight thread and need a tapped hole or a nut; they don't cut their own thread. If you need something that bites into unthreaded sheet metal, a self-tapping sheet metal screw is the correct choice instead.

Each jar holds 100 screws. The jar pack is what service vans and MRO stockrooms buy it in, since it keeps a common 10-24 x 2 size loose and countable rather than carded.

No. A round head sits proud of the surface by design, so it will not come flush the way an oval or flat head countersinks. For flush seating in a beveled or countersunk cover plate hole, pick an oval head or flat head 10-24 instead. Where the head riding on top of the material is acceptable, the round head gives a larger bearing surface against the part.

SBR in the part description is slotted brass round head, so the screw carries a brass finish. Electricians commonly spec brass screws where the fastener will be visible on a cover plate or fixture canopy, or where a non-corroding, non-magnetic fastener is preferred.

That's a common use for them. 10-24 is the single thread size used on virtually all steel device boxes in North America, so stocking one jar of 10-24 x 2 round head slotted screws covers every box in a portfolio for the long mounting situations. Keeping a shorter 10-24 on the shelf alongside them covers the flush work.