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We can produce DHD series Down the hole hammer, high pressure type DHD3.5 down the hole hammer is a kind of 3.5 inch hammer, high pressure Product Thread connection Outer Diameter Recommend Hole diameter Working pressure Length without bit Weight mm mm Mpa Mm KGS DHD3.5 API 2 3/8” REG PIN 80 90~125 0.6~2.1 990 27 DHD340 API 2 …

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Down the Hole Hammers (DTH) Complete Solution . 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").