Metallics JFWP28 10 x 3/4 in. Flat Head Phillips Wood Screws - Steel Zinc - Each

Yes, if the countersink matches the head. The JFWP28 has a flat head measuring 0.34 to 0.385 in. across with a head height of 0.116 in., so a standard 82 degree countersink at that diameter brings it flush or slightly below. On softwood you can usually just drive it and let the flat head pull itself in.

These are steel with a zinc finish, which is a dry-location plating. Zinc gives handling and light humidity protection for indoor work, junction box mounting, strapping, and trim. For exterior, treated lumber, or wet locations, go to a stainless or hot dip galvanized wood screw instead; plain zinc will bleed rust.

No. The JFWP28 wood screws are not Buy American compliant and are not ARRA compliant, and the country of origin is listed as multiple. If your contract carries a domestic sourcing clause, specify a domestically produced fastener instead.

A #3 Phillips bit. The JFWP28 is a Phillips drive screw and the recess is sized for a #3 driver, with a recess diameter of 0.245 to 0.258 in. and a depth of 0.123 to 0.146 in. A #2 bit will sit shallow in that recess and cam out, so keep #3 tips on the gun if you're running a jar of these.

They have a tapered point, which is the traditional wood screw geometry, so it cuts a starting hole but does not self-drill. In pine and other softwoods you can drive them straight. In hardwood, near an edge, or into anything prone to splitting, pilot drill the shank. At 13 threads per inch and only 3/4 in. long, there is not much thread to recover from a split.

They ship in a jar, and the order minimum is 100 per jar. That is a practical count for a truck or a shop drawer rather than a bulk box, so if you need several thousand for a large rough in you're ordering multiple jars.

They're built to ASME B18.6.1, with the thread specifically to ASME B18.6.1-1997. That is the wood screw standard covering head dimensions, recess geometry, and thread form, which matters when a spec section calls out standard wood screws rather than a proprietary fastener.

Metallics lists them for the electrical, plumbing, heating and air conditioning trades. In practice that's mounting boxes, straps, clamps, and brackets to wood studs, joists, and blocking. The 3/4 in. length is short, so it's a surface-fastening screw into wood, not a structural or through-fastening screw.

On short wood screws the thread runs as close to the underside of the head as practical, because there isn't length enough for a full unthreaded shank. Metallics notes that screws too short to take the minimum thread length carry thread right up under the head. At 3/4 in. overall with 13 threads per inch, nearly the whole screw grips, which is what you want when fastening a strap or a box ear into wood.