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Sep 26, 2019 · bosch’s cc4230 self-centering drill bit set includes three sizes: #6 (=3/32) #8 (=7/64) and #10 (=1/8). they are everything one may want from a drill bit: efficient, convenient, precise, and compatible with any tool. the ease of changing these best drill bits for steel is excellent for the workflow, too.

As a rule of thumb, the smallest hole diameter a dth hammer can drill is its nominal size. i.e. standard 102 mm (4”) hammer will drill a hole down to a minimum diameter of 102 mm (4”). the limiting factor is the outside diameter of the hammer, because as the hole diameter reduces due to diameter wear of the bit, airflow is restricted.

The optimum range of hole size for dth drilling is 90 mm (3.5”) to 254 mm (10”). smaller holes are generally drilled using tophammer drill rigs, and larger holes generally use rotary drill rigs. as a rule of thumb, the smallest hole diameter a dth hammer can drill is its nominal size. i.e. standard 102 mm (4”) hammer will drill a hole down to a minimum diameter of 102 mm (4”).

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