Metallics JFW121 4 x 3/4 in. Flat Head Slotted Wood Screws - Steel Zinc - Each

The JFW121 is a #4 diameter by 3/4 inch long flat head wood screw in zinc plated steel, with 22 threads per inch. It ships in a jar, with a minimum order of 100 count.

Yes, if the countersink is cut for a #4 flat head. The head measures 0.195 to 0.225 inch across with a head height of 0.067 inch, so a standard 82 degree countersink at that diameter brings the top of the head level with the surface. On thin sheet metal escutcheons or strike plates without a countersink, the head will stand proud.

The JFW121 takes a flat blade driver, with a slot 0.031 to 0.039 inch wide and 0.02 to 0.03 inch deep. That is a shallow, narrow slot made for hand driving, and a slotted bit cams out easily in a drill. For restoration work, period door hardware, or anywhere the fastener head has to look correct, slotted is what you want. For volume production driving, pick a Phillips or square drive wood screw instead.

On the 3/4 inch JFW121 it effectively does. Metallics states that screws too short to accommodate the minimum thread length have threads extending as close to the underside of the head as practicable; the 2/3 thread rule applies from 1 inch of length upward. Full thread on a short screw means more holding power in thin stock, but it also means you cannot rely on an unthreaded shank to clamp two pieces together.

Yes. Both the dimensions and the threads are built to ASME B18.6.1, with the thread specifically to ASME B18.6.1-1997. That is the inch wood screw standard, so head diameter, head height, slot, and thread pitch are interchangeable with any other screw made to it.

Keep them inside. The JFW121 is zinc plated steel, which handles indoor humidity and incidental moisture but will rust in sustained wet or exterior exposure. For exterior trim, decks, or treated lumber, go to stainless or a coated exterior screw.

The JFW121 is flagged ARRA compliant and Buy American compliant, with country of origin listed as China. Procurement officers writing to a domestic end product clause should weigh those two facts together against the specific clause in their contract.

This is the small fastener for mounting to wood: securing device boxes, straps, clamps, and plates to studs, joists, or framing where a 3/4 inch bite is all the depth available. The #4 shank keeps the hole small enough for thin trim and light hardware, and the flat head seats flush in a countersunk mounting ear. Metallics catalogues it on the electrical side for exactly that work.