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Dth hammer, down the hole hammer, rock drilling hammer manufacturer / supplier in china, offering hjg water well drilling 6 inch dth hammer, cemented carbide for mining, crawler hydraulic well-geothermal drilling rig hjg-w828a and so on.

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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