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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.

Drill collars 2-7/8" to 14" connection threads: nc26, nc31, nc38, nc40, nc46, nc50, 5 1/2fh.6 5/8fh. internal upset: iu, eu, ieu heavy weight drill pipe is a medium-weight drilling pipe, (referred standards in api spec 7-1). it has bigger wall thickness than common drilling pipe and smaller than drill collar.

73mm drill pipe. 89mm drill tube. dn150 pipe. dn200 pipe. dn250 pipe. dn300 pipe. dn350 pipe. dn400 pipe. dn450 pipe. dn500 pipe. dn600 pipe. dn750 pipe. dn850 pipe. dn900 pipe. dn1050 pipe. dn1100 pipe. dn1200 pipe. dn1500 pipe. corrugated steel pipe. cement lined steel pipe. steel pipe 38x2.6 (surface rust) material quantity length m od mm x ...

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