Metallics JRDS1M 8 x 1-1/4 in. Bugle Head Square Drive Deck Screws - All-Weather - Type 17 - Coarse Threads - Each

They take a #2 square (Robertson) driver. The square recess runs 0.110 to 0.113 inch wide and 0.064 to 0.075 inch deep, so a #2 square bit seats fully. Power bits ship with the screws, so you are not hunting for a driver on the jobsite.

Yes. The #8 x 1-1/4 in. Metallics bugle head deck screw carries a green ceramic all-weather coating over zinc, rated to withstand a 500 hour salt-spray test. That is the exterior-duty version of the line, so it holds up on exposed decking, fence rail, and outdoor equipment mounting rather than interior-only use.

That is the point of the Type 17 tip. It has a cut notch at the end that augers out wood as it enters, so the screw starts on its own and the coarse UNC thread pulls through without a pilot hole in most softwood and dimensional lumber. Near an end or edge, pre-drilling still reduces splitting.

The JRDS1M ships as a 1,000-piece jar, and 1,000 is the order minimum. The jar weighs 3.74 lbs. Metallics offers other sizes and quantities in the same bugle head deck screw line by request.

No countersinking needed. The bugle head is a tapered, self-countersinking profile, measuring 0.315 to 0.363 inch across with a head height of only 0.020 to 0.039 inch, so it draws itself down level with the wood surface as you drive it.

At 1-1/4 inch of overall length, this is a short-grip fastener: it suits attaching sheet goods, box brackets, straps, and light channel to a wood stud or joist where you only need to bite the framing member. For through-fastening two pieces of nominal lumber you need a longer screw from the same bugle head line. Metallics lists this family for the electrical, plumbing, and HVAC trades, which is why it shows up on mechanical and electrical rough-in as much as on deck boards.

Both the ARRA and Buy American compliance flags on the JRDS1M are marked compliant. Country of origin is listed as multiple, so if your specification requires documented domestic melt and manufacture on a per-lot basis, request the certification for the lot you are supplied.

The screws are AISI 1080 carbon steel with a coarse UNC thread at 8 to 10 threads per inch. Coarse pitch at that count is what gives the holding power in wood; the hardened carbon steel is also why these are not a stainless screw and should not be mixed with pressure-treated lumber applications that call for stainless.

No single industry standard governs bugle head deck screw dimensions, and Metallics publishes the head and recess figures as a guide with slight deviations accepted. If your drawing calls out an exact head diameter tolerance, treat the 0.315 to 0.363 inch head width as nominal rather than a controlled spec.