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Aug 14, 2020 · since its beginning in 1985, numa has become a major manufacturer of dth hammers and bits for the domestic and international drilling industry. the company designs and builds downhole hammers and bits for drilling vertical and horizontal holes 3½ to 50½ inches (89 to 1,283 millimeters) in diameter. to learn more, visit www.numahammers.

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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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