Metallics JRBWS13 Screw 8 x 7/8 RH SL WS BR (Jar 100)

This one is a wood screw, so the thread is coarse and tapered to cut its own path in wood, plywood, or a wood stud. If you are threading into a metal device box, a metal strap, or an existing tapped hole, you want a machine screw instead, not this. Use the JRBWS13 where the screw bites into wood.

Round head means it sits on top of the surface, it does not countersink. The underside bears flat on the material and the domed head stays proud, which is what you want for holding a strap, a clamp, or a thin plate down. If you need the head buried flush with the surface, a round head is the wrong choice and you need a flat head screw in a countersunk hole.

At 7/8 inch, you get roughly half to three quarters of an inch of thread into the wood once the thickness of whatever you are fastening is accounted for, which is plenty for straps, clamps, boxes and plates on framing. If you are mounting something heavy or fastening through thick trim, step up to a longer #8 wood screw so you keep adequate bite in the stud.

Brass is specified for two reasons on electrical and trim work: it will not rust the way plain steel does in damp locations, and it matches brass or bronze finish plates and hardware so the fastener head is not an eyesore. The trade-off is that brass is softer than steel, so drill a pilot hole in hardwood and drive it with hand tools or a low-torque setting to avoid twisting the head off.

A flat blade. The JRBWS13 has a slotted head, not Phillips or square drive, so a straight-tip screwdriver sized to the slot is what you want. On a soft brass slotted head, a hand driver that fully fills the slot keeps you from chewing the head out.

Order Metallics JRBWS13. That single model covers the brass #8 x 7/8 round head slotted wood screw in the 100 count jar, so there is no finish or size option to specify on the order.