Metallics NHSD35 High-Speed Twist Drill 35 2-5/8" (10pcs)

The Metallics NHSD35 is a wire-gauge size 35 bit, which cuts a 0.110 inch hole. Wire-gauge numbering runs opposite to fractional sizing, so the higher the number the smaller the bit. A 0.110 inch hole is the common tap-drill size for a 6-32 machine screw, which is why electricians keep this one in the pouch for drilling device boxes, straps and enclosures that get screwed back together.

Yes. Size 35 at 0.110 inch is the standard tap drill for a 6-32 thread, so it is the bit you pair with a 6-32 tap when you are adding a ground screw hole or a mounting screw to a steel box or cover. If you want a clearance hole instead, where the 6-32 screw passes straight through without threading, you need a larger bit rather than this one.

Ten bits per pack, supplied in a pouch rather than an index or case. That is a consumable quantity, so if you are standardizing a truck or a shop crib on a 6-32 tap drill size, you are buying a resupply pack, not a single bit.

High-speed steel handles mild steel boxes, enclosures, strut, hangers and aluminum, which covers most electrical rough-in drilling. Where HSS gives up is stainless and hardened or heat-treated steel; for those, step up to a cobalt bit. The NHSD35 is HSS.

Order it as Metallics NHSD35. The N prefix marks the wire-gauge (number) series and the 35 is the gauge size, so the adjacent sizes follow the same pattern. Specifying the gauge number matters here, since a fractional bit near 0.110 inch is not interchangeable with a tap drill size.