Metallics JFWP15 8 x 4 in. Flat Head Phillips Wood Screws - Steel Zinc - Each

Keep them dry. The JFWP15 is zinc plated steel, which handles indoor framing, blocking, and general electrical rough-in fine, but zinc plating is not a marine or sustained wet-exposure coating and it will corrode in treated lumber or outdoors. For exterior decks, pressure treated wood, or wet mechanical rooms, specify stainless or a coated exterior-rated screw instead.

No. The JFWP15 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. For a project with domestic-sourcing requirements you will need a fastener line certified as domestically produced.

A #2 Phillips bit. The recess is a Phillips with a 0.191 to 0.204 inch diameter and 0.113 to 0.136 inch depth, which is standard for a #8 screw, so a worn #2 bit will cam out and chew the recess. Keep fresh #2 bits on hand if you are driving a full jar of 100.

In hardwood, yes. These are tapered point wood screws, not self-drilling, so at 4 inches of length in oak, maple, or dense engineered lumber you want a pilot hole for the threaded portion and a slightly larger clearance hole through the top piece. In pine and other softwoods a pilot is usually only needed near an edge or end to avoid splitting.

Head, recess, and thread geometry conform to ASME B18.6.1, with threads to ASME B18.6.1-1997 at 15 threads per inch. Because the dimensions follow that standard, a #8 JFWP15 will seat in the same countersinks and drive with the same #2 Phillips bit as any other standard-conforming #8 flat head Phillips wood screw already on the job.

They ship in a jar of 100 pieces, and 100 count is the order minimum. If you need a different length or a different count in the same JFWP wood screw series, other sizes and quantities are made available by request.

The length is the point. At 4 inches with a #8 shank, these are for reaching through furring, drywall, or thick blocking into solid framing, mounting panel backboards and plywood backer to studs, or fastening heavy strut and equipment backing. For surface-mounting a device box or a thin plate you want a much shorter screw, since 4 inches of tapered point will run clear through a single stud face.