Metallics JDWSR9C 8 x 3 in. Bugle Head Square Drive Drywall Screws - Steel Black Phosphate - Coarse Threads - Each

Coarse thread, like the Metallics JDWSR9C, is the wood-framing screw. The field application is drywall to wood, with UNC coarse threads at 8 to 10 threads per inch and a sharp point that starts without pre-drilling. For light-gauge steel studs you want a fine thread (high-low/S-point) drywall screw instead, which bites thin metal without stripping.

Yes, for a single 1/2 inch sheet it is far longer than needed. At 3 inches of length in a #8 diameter, the JDWSR9C is sized for thick build-ups: double or triple layer board, drywall over existing finish, furring and strapping, or wood-to-wood work where you want deep penetration into the stud. For a single layer of 1/2 inch board on wood studs, a 1-1/4 inch coarse thread screw is the normal choice.

No. Black phosphate is a dry-interior finish, not a corrosion coating. The JDWSR9C is steel with a black phosphate finish, which gives mild rust resistance in storage and handling only. For exterior decks, soffits, wet rooms, or treated lumber, use a screw with a coated or stainless corrosion rating instead, or the heads will bleed rust through the finish.

No. The JDWSR9C is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If your contract carries a domestic-sourcing clause, this part will not satisfy it and you need a domestically manufactured fastener.

That is what the bugle head is for. The head on the JDWSR9C runs 0.315 to 0.363 inch across with a head height of 0.020 to 0.039 inch, so the flared underside compresses the board and seats just below the paper face instead of cutting through it. Set a depth-sensitive clutch or dimpler bit and the head sits ready for compound.

The JDWSR9C ships as a jar of 100 screws, which is the order minimum. Jar packaging suits service vans and MRO stockrooms better than bulk boxes, since the jar reseals and the count stays known.

The JDWSR9C is heat treated to Rockwell C45-64 from AISI 1018 steel, which is the hardness band a drywall screw needs to drive its own thread into wood without the point rolling over or the square recess stripping. Hardened screws are brittle in shear by nature, so they are fasteners for board and trim, not for structural or load-bearing connections.

About 1.19 lbs per jar, with the packed jar measuring 3.5 by 3.5 by 5.75 inches. Useful if you are planning a parts bin layout or batching a multi-jar order for a job site.

Close, but not identical. There is no single industry standard for drywall screw or bugle head dimensions, so Metallics publishes the JDWSR9C head at 0.315 to 0.363 inch wide as a guide and slight deviations between batches or brands are normal. It makes no practical difference on board, but if you are matching screws in a visible or jig-fed application, verify with one screw first.