Tungsten Carbide Step Drill bitsⅠ

A tungsten carbide step drill bit, also called unibit, is a roughly conical bit with a stairstep profile. It is a drill bit that has the tip ground down to a different diameter. Each step on the bit is larger in diameter than the step before. The transition between this ground diameter and the original diameter is either straight, to form a counterbore, or angled, to form a countersink. Due to its design, a single bit can be used for drilling a wide range of hole sizes.

Smaller tungsten step drill bits are self-starting and no pilot bit is required to start the hole. On larger step drill bits, you need to have a hole pre-drilled that is equal in diameter to the smallest step on the bit. The larger-size bits have blunt tips and are used for hole enlarging. Most of these bits are custom-made for each application, which makes them more expensive.

(To be continued. This article is divided into 5 parts. Here is part 1. For part 2, please refer to http://news.chinatungsten.com/en/tungsten-information/80508-ti-10401)

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