Metallics JFW80 10 x 21/4 in. Flat Head Slotted Wood Screws - Steel Zinc - Each

The JFW80 ships in a jar of 100, and 100 count is the order minimum. If you need a different size or a different quantity of this steel zinc flat head wood screw, Metallics makes other sizes and quantities available by request.

Yes, that is what the flat head is for. The JFW80 head measures 0.34 to 0.385 inch across with a head height of 0.116 inch, so it seats fully into a standard countersink and finishes flush with the surface. Bore your countersink to accept a head up to about 0.385 inch.

It is a wood screw with a tapered point and 13 threads per inch, made for driving into wood, plywood, and similar soft substrates. It has no drill point and no machine thread, so it will not tap into steel or thread into a machine-tapped hole. For metal-to-metal work you want a self-drilling or machine screw instead.

These are steel with a zinc finish. Zinc plating gives you corrosion protection for dry interior work and protected areas, not for sustained exterior exposure, treated lumber, or wet locations. For a deck, treated framing, or anything weather exposed, specify a hot dip galvanized or stainless wood screw instead.

The JFW80 uses a slotted drive with a slot 0.05 to 0.06 inch wide and 0.034 to 0.053 inch deep. A slot that shallow and narrow does not hold a bit under power the way a Phillips or square recess does, so these are best hand driven or run slowly with a matched flat blade. Slotted screws are still specified on a lot of electrical and restoration work where the look matters.

Yes. The JFW80 is built to ASME B18.6.1, with threads to ASME B18.6.1-1997. That is the standard for wood screws, and it is what covers the head diameter, head height, slot, and thread dimensions, so the head and slot on a replacement screw from any compliant maker will match.

Metallics lists the JFW80 as ARRA compliant and Buy American compliant. Country of origin is China. For federally funded work, check which clause your contract actually invokes, since Buy American compliance flags and domestic-origin requirements are not always the same test.

A 100 count jar of the JFW80 weighs 1.48 lbs. The jar itself is 3 inches long by 3 inches wide by 3.6 inches high, which matters if you are laying these into a shop drawer or a van shelf alongside other fastener jars.