Metallics JFW123 4 x 1-1/4 in. Flat Head Slotted Wood Screws - Steel Zinc - Each

The JFW123 ships 100 screws to a jar, and 100 count is the order minimum. So the smallest buy is one jar of 100 of the #4 x 1-1/4 in. flat head slotted wood screws.

Yes, that's what the flat head is for. The JFW123 head measures 0.195 to 0.225 in. across with a head height of 0.067 in., so in a properly countersunk pilot hole the top of the head finishes level with the surface. If your plate or strap is punched with a straight (non-countersunk) hole, a flat head will stand proud and you want an oval or round head instead.

Keep them inside. The JFW123 is steel with a zinc plating, which handles indoor humidity but is not a weatherproof coating, so it will rust in direct exposure, pressure-treated lumber, or coastal air. For exterior trim, decking, or treated wood, use a hot-dip galvanized or stainless screw instead.

The slot is 0.031 to 0.039 in. wide and 0.02 to 0.03 in. deep, so you want a thin, narrow flat-tip driver, the kind sold as a #1 or 3/32 in. cabinet tip. A wide standard blade will ride up out of a slot that shallow and chew the head. These are slotted drive only, no Phillips or square recess.

In hardwood or near an edge, yes. The JFW123 has a tapered point and 22 threads per inch, so it pulls itself in as it cuts rather than drilling its own clearance hole like a self-drilling screw. In soft pine with a 1-1/4 in. length you can usually drive it dry; in oak, maple, or MDF a pilot hole keeps the slotted head from stripping and the stock from splitting.

Yes. The JFW123 is built to ASME B18.6.1, with the thread conforming to ASME B18.6.1-1997. That covers head diameter, head height, slot geometry, and thread form, so the head and slot dimensions listed are the standard values an inspector or spec writer would expect for a #4 slotted flat head wood screw.

Metallics lists the JFW123 as both ARRA compliant and Buy American compliant, with country of origin China. If your contract runs under a strict domestic-melt or domestic-manufacture clause rather than the ARRA/Buy American designation, confirm which rule your spec is written to before you submit.

Roughly two thirds of the length is threaded on the JFW123, per the Metallics thread note, leaving a short unthreaded shank below the head. That unthreaded portion is what lets the screw clamp a thin part down tight against the substrate rather than just spinning in it. On very short lengths Metallics runs the thread as close to the head as practical.

This is the small fastener size electricians and maintenance crews reach for to mount light-duty items to wood: securing a strap, a small device plate, a low-voltage bracket, or a fixture canopy screw block into a stud or wood blocking. At 1-1/4 in. long it gives roughly an inch of bite into the wood behind a thin part, and the flat head countersinks out of the way. Metallics catalogues the JFW123 under its electrical supplies line for exactly that kind of work.

Yes. The JFW123 is the #4 x 1-1/4 in. zinc flat head slotted screw, and Metallics offers other sizes and quantities in the JFW series by request. If you are standardizing a maintenance stock across several screw sizes, ask for the other JFW lengths rather than buying mixed brands.