Metallics TTS33B 12 x 3/4 in. Pan Head Tri-Drive Tapping Screws - Steel Zinc - Each

The TTS33B has a tri-drive pan head, meaning the recess takes a slotted bit, a Phillips bit, or a square (Robertson) bit. Handy on a service call when you only have one driver in the pouch, and it lets a crew standardize on one screw instead of stocking three recess types.

It is a #12 diameter screw, 3/4 inch long. That length suits fastening into sheet metal, device boxes, duct, and light-gauge framing where the screw only has to pass through thin material and tap its own thread. For thicker stacked assemblies or where you need more thread engagement past the far side, step up to a longer #12 tapping screw.

No tapping is needed. The TTS33B is a self-tapping screw, so it cuts its own thread as it drives into a pilot hole in sheet metal or light-gauge material. You still want a correctly sized pilot hole in harder or thicker stock so the head does not strip before the thread seats.

These are zinc plated steel. Zinc plating handles indoor and generally dry conditions well, but it is a sacrificial coating and will corrode in sustained wet, coastal, or chemical exposure. For exterior or wash-down work, specify a stainless fastener instead.

Yes, the TTS33B tri-drive tapping screw is made in the USA. That is the kind of detail institutional and government procurement needs on record when domestic-content language is in the contract.

A pan head sits low with a broad, rounded bearing surface, so it clamps sheet metal without the raised profile of a hex washer head. That matters inside enclosures and boxes where a taller head could foul a cover, a device yoke, or conductors. If you want to drive with a nut setter and need maximum bearing area on thin sheet, a hex washer head is the better pick.

Order Metallics part number TTS33B. That is the single designation covering the #12 x 3/4 inch zinc plated steel pan head tri-drive tapping screw, so there is no finish or drive option to pick alongside it.