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Dth drill bitsmanufacturer, factory, supplier from china (total 24 products for dth drill bits)

Factory address:ming zhao industry park, hetang district, zhuzhou city, hunan province, china: sales office:world trade plaze, hetang district, zhuzhou city, hunan province, china +86-731-22031856: [email protected]

Down-the-hole bits we offer a comprehensive range of dth drill bits to match all conceivable applications. each bit is made from quality alloy steel, and has been precision machined to produce a perfect body, heat treated to the required hardness, given surface compression for fatigue resistance, and fitted with precision buttons manufactured ...

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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