Metallics HSSC9E Drill Bit HD Cobalt St 135d SplPt 3/16" 3-1/2" YLW (1pc)

The HSSC9E is a 3/16 inch diameter bit with a 3-1/2 inch overall length. That diameter is the common pilot size for 1/4 inch lag or tapcon style anchors and for threading 1/4-20 after tapping, and the 3-1/2 inch length gives enough reach for structural steel, strut, and junction box work without needing an extension.

Yes. Cobalt high speed steel holds its edge at the higher temperatures stainless generates, which is why it is the usual choice over plain HSS for stainless, hardened steel, and cast iron. Run it slower with steady pressure and cutting fluid, and let the bit cut rather than letting it rub, which is what work-hardens stainless and kills a bit.

A 135 degree split point starts on its own without a center punch and resists walking on hard, smooth metal. The flatter angle spreads the cutting load across a wider lip, and the split relieves the center so the bit bites instead of skating. For an electrician drilling strut, enclosure sides, or a steel beam overhead, that means fewer punch marks and fewer wandering holes compared with a conventional 118 degree point.

Metallics part number HSSC9E, the heavy duty cobalt straight shank bit, 135 degree split point, 3/16 inch by 3-1/2 inch, yellow finish. Quote that number to match it exactly, since Metallics uses separate part numbers for each diameter in the cobalt line.

Use it for metal. Cobalt HSS is ground for steel and other metals, and the HSSC9E is a twist bit with no carbide tip, so it is the wrong tool for concrete, block, or brick, that calls for a carbide-tipped hammer bit. For wood or plastic it will cut, but a brad point or spade bit leaves a cleaner hole and saves the cobalt edge for metal.

One bit per order, supplied in a pouch rather than loose or in an index case. If you are stocking a van or a facility crib and want multiples of 3/16 inch, order the quantity you need, this part number is a single-piece item.