Metallics TGW91515M 9-15 x 1-1/2 in. 1/4 Hex Head Metal to Wood Screws with Washer - All-Weather - Each

No. The TGW91515M uses a gimlet point, which is a sharp tapered point that starts and cuts its own hole in wood. It is a wood-threading screw, 15 threads per inch, intended to pull a metal part down onto a wood substrate, not to drill through steel. If you are fastening into structural steel or heavy gauge metal, you want a self-drilling point screw instead.

Yes. The TGW91515M carries a zinc all-weather coating, which is what the "All-Weather" in the name refers to. That is a corrosion coating suited to exterior and damp exposure such as rooftop equipment supports, exterior conduit straps, and unconditioned spaces.

A 1/4 inch hex driver. The TGW91515M has a 1/4 inch hex head with a hex drive, so a nut setter in an impact driver or drill runs them without cam-out and without a separate bit for the washer.

The TGW91515M is 1-1/2 inches long overall, so subtract whatever thickness of metal, strap, or hanger you are fastening through and the remainder is your embedment into the wood. Through a thin gauge bracket you get close to the full 1-1/2 inch of thread in the framing; through a thick assembly, step up in length.

It spreads the clamp load across the metal you are fastening. On a hanger, strap, bracket, or sheet metal flange the bonded washer under the hex head keeps the head from pulling through thin material and seats the part flat against the wood. That is why this is specified as a metal to wood screw with washer rather than a plain hex head wood screw.

They ship in a box of 1,000, and 1,000 is the order minimum. So this is a bulk buy for a crew or a stockroom, not a handful for one repair. Box weight is listed at 9.55 lbs.

Both are flagged as compliant on the TGW91515M, which matters on federally funded work where fastener sourcing gets reviewed. Country of origin is listed as multiple, so if your specification requires a single named country of manufacture, confirm the origin on the lot you receive.

It is a fastener for the electrical, plumbing, heating, and air conditioning trades. Typical use is anchoring metal to wood framing: conduit and pipe straps, duct hangers, junction box brackets, unistrut backing, and equipment mounts screwed into studs, joists, or blocking.

The TGW91515M is the 9-15 diameter at 1-1/2 inches. Metallics builds the same all-weather hex washer head screw in other lengths and pack quantities, and those can be brought in by request, so if your assembly needs a shorter or longer screw in the same thread, ask for it rather than substituting a different head style.