#10 .189mm Machine Screw Solid Counterbore - High Performance & Durable Cutting Tool | Drill America Hot Deals It is recommended over the

It is recommended over the straight-flute for more difficult materials

Drill Bit Size: 31/64"

not the actual size of the tap The thread tapers 3/4 of an inch per foot

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#10 .189mm Machine Screw Solid Counterbore - High Performance & Durable Cutting Tool | Drill America Hot Deals It is recommended over theCounterboring is the enlargement of a portion of a hole that has previously been formed. If the counterbored portion is shallow (1 8" or less), the operations is usually known as spot facing; for example, a flat seat for a bolt head or nut. If, on the other hand, the hole is enlarged to a considerable depth, it is designated as counterboring. These counterbores are made of two piece construction, having an integral shank and counterbore cutter, and a