Metallics JTTS38 6 x 1-1/2 in. Pan Head Tri-Drive Tapping Screws - Steel Zinc - Each

The JTTS38 has a pan head with a combination recess: slotted, Phillips and square drive all engage the same head. On a service call that means a flat blade, a #2 Phillips or a #1 square bit will all drive it, so you aren't held up waiting for one specific bit. The square recess is the one to use if you want to stick the screw on the bit and run it one-handed overhead.

It's a #6 diameter screw, 1-1/2 inches long, which is a long shank for a #6. That length is for reaching through a box, bracket or strap into wood or a stud behind it rather than for thin sheet metal, where the extra shank would just stick out the back.

These are steel with a zinc plating, which is the standard finish for interior electrical and MRO work: dry indoor boxes, panels, straps, device mounting. Zinc plating is a sacrificial coating, not a marine finish, so for direct exterior exposure or wet locations step up to a stainless fastener instead.

It's a tapping screw, so it cuts its own thread as it drives and no tapping is needed. In wood and soft substrates it will go straight in. In sheet metal or harder material, drill a clearance pilot for the #6 shank so the head seats flat and the threads don't strip. The pan head bears on the surface rather than countersinking, so it does not need a tapered hole.

Order Metallics MPN JTTS38. That number covers the #6 x 1-1/2 inch pan head tri-drive tapping screw in steel zinc, jar of 100. Quote the MPN rather than the description, since Metallics uses closely related numbers across the diameter and length range.

They ship in a jar of 100. The jar is the reason these work well as truck or shop stock, it reseals and keeps a single size separated instead of mixing loose in a bucket. Order one jar per size you want to carry.

Pan head is what you want when the fastener sits on top of the work: mounting straps, brackets, plates, device yokes. The broad flat underside spreads bearing load and holds thin material without pulling through. If the head has to finish flush with the surface, that's a job for a flat or oval head in a countersunk hole, not this screw.

Yes, the JTTS38 is US-made. That matters on government, institutional and some utility work where domestic sourcing is a condition of the contract, and it is worth noting on the submittal for those jobs.