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Dth bits are mainly used for quarrying, ore mining, coal mining, soft, medium hard, and hard rock, blast hole drilling and water well drilling project, marble quarry or …

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.

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China api spec 5dp oil drill pipe 89mm g105 or s135, find details about china 3-1/2", api 5dp from api spec 5dp oil drill pipe 89mm g105 or s135…

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