Metallics DWSR6B 6 x 21/4 in. Bugle Head Square Drywall Screws - Steel Black Phosphate - Coarse Threads - Each

A #1 square drive bit. The DWSR6B has a square (Robertson style) recess, driver size #1, with a recess width of 0.090 to 0.106 in. and a recess depth of 0.055 to 0.071 in. A #2 square bit will not seat properly in that recess, so stock #1 bits for the crew before the first board goes up.

Coarse thread is the right pick for wood framing, and that is what the DWSR6B is: coarse UNC thread at 8 to 10 threads per inch with a sharp point, listed for drywall-to-wood applications. For light gauge steel studs you want a fine thread (S-type) screw instead, because the coarse thread strips out of thin metal rather than pulling the board tight.

No. Black phosphate on steel is a dry interior finish, mild corrosion resistance only. The DWSR6B is steel with a black phosphate finish, intended for interior drywall-to-wood work. For exterior, pressure treated lumber, or persistently damp areas, go to a coated exterior or deck screw instead.

No. The DWSR6B is flagged non-compliant for both Buy American and ARRA, with country of origin listed as multiple. On a job carrying domestic sourcing language you will need a documented domestic fastener instead.

Yes. The bugle head is shallow by design, 0.020 to 0.031 in. head height across a 0.315 to 0.347 in. head width, so it pulls itself into the paper face without tearing it and sits below the surface for compound. Set your gun depth so the head dimples the board rather than breaking the paper.

The DWSR6B ships as a 3000 piece box, which is also the order minimum (3000 each). Metallics builds the DWSR series in other sizes and pack quantities on request, so if 3000 of this length is more than the job needs, ask for the size and count you want.

They are case hardened to Rockwell C45-64 and made from AISI 1018 steel, which is the normal recipe for a drywall screw: hard enough to hold the square recess and drive a sharp point through board into wood without stripping. That same hardness makes the shank brittle, so in dense or old dry hardwood framing predrilling or stepping down gun speed keeps heads from popping off.

About 24 lbs per box, in a carton measuring 9 x 9 x 6.13 in. That is a one-hand carry but heavy for a shelf of them, so plan the stockroom shelving if you are ordering multiple boxes for a multi-family or large commercial drywall package.

There is no single industry standard for bugle head or drywall screw dimensions, so Metallics publishes the DWSR6B head height and width as ranges (0.020 to 0.031 in. height, 0.315 to 0.347 in. width) and treats them as a guide. Slight lot-to-lot deviation is normal and expected; it does not affect how the screw sets in board.