Metallics JRSDS4 8 x 2 in. Bugle Head Star Drive Deck Screws - Steel Yellow Zinc - Type 17 - Threads - Each

A T20 star bit. The JRSDS4 uses a flat six-lobe (star) recess, so a T20 Torx-style driver seats fully and keeps the bit from camming out when you are running long screws into dense framing. Stock a couple of bits per 100-count jar if you are driving all day.

No. The JRSDS4 has a Type 17 point, which is the auger-style chip cavity at the tip that cuts its own hole and clears waste as it goes, so it drives without a pilot hole even in denser woods. Pre-drilling is still worth it close to a board end or edge where splitting is a risk.

Yes for nominal 5/4 boards, which run about 1 inch finished, leaving roughly an inch of the 2 inch screw in the joist. If you are fastening full 2x material (1-1/2 in. thick), 2 inches only buys you about a half inch of penetration into the framing and you should step up in length. Metallics offers other lengths in the RSDS deck screw series.

Yellow zinc dichromate over steel is a mild corrosion coating, suited to covered or dry-service work such as blocking, framing, subfloor, strapping and interior deck-screw duty. On an exposed deck, and especially in treated lumber or anywhere near salt air, go with a hot-dip galvanized or coated exterior-rated deck screw instead. Treated lumber chemistry eats plain zinc.

The bugle head is made to pull itself flush and self-countersink into wood without a pre-cut countersink. Head height is 0.108 in. and head width runs 0.285 to 0.331 in., so the bearing surface is small enough not to blow out the top of a deck board but wide enough to hold. Ease off the trigger at the end of the drive if you are working softwood, or you can sink it below the surface.

They ship in a jar of 100, and 100 count is the order minimum. The filled jar weighs 0.87 lbs. Other quantities are available by request.

The JRSDS4 is flagged ARRA compliant and Buy American compliant in the manufacturer's data, with country of origin listed as China. If your contract runs under a stricter domestic-sourcing clause than ARRA, verify against that specific clause before you submit.

Nine threads per inch, UNC form, in AISI 1018 to 1022 carbon steel. The coarse 9 TPI thread with the deeper profile is what gives the pull-out resistance in wood; it is not meant for metal framing or for threading into a nut.

That is exactly where the RSDS series sits in Metallics' line, which is catalogued on the electrical side. For an electrician mounting plywood backboards, blocking, strut backing or wood-mounted enclosures, the #8 x 2 in. with a Type 17 point drives without pre-drilling and the bugle head pulls tight to the board. Keep it to dry interior locations given the yellow zinc finish.

Treat them as a guide. There is no single industry standard for deck screw dimensions, so Metallics publishes these figures with slight deviations considered acceptable. The head width range of 0.285 to 0.331 in. reflects that tolerance. The T20 drive and #8 x 2 in. nominal size are the numbers to order by.