TYPICALLY FOR DRILL PIPE DIAMETERS 5-1/2” (152 MM) TO 7” (178 MM)

The most recent entry to the specialised cushion sub offerings, these sealed tools are designed for rotary drilling equipment engaged in construction, quarrying, open-pit mining and oil and gas drilling applications.  By incorporating a certain amount of axial movement below the rotary drive, the sliding spindle of the cushion sub will allow the threads of the mating drill string components to float together or apart during rotation without any axial movement of the rotary head.  Urethane cushions utilized at the upper and lower ends of the floating spindle absorb the shock transmitted by the bit and also reduce the impact on the rotary drive bearings, hydraulic motors and the gear box assembly.

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FUNCTION AND APPLICATION

The 400127ES assembly is applicable to a majority of mining operations that utilize conventional mid-range rotary drills such where production encounters very difficult drilling conditions. This heavy duty cushion sub exceeds the limitations of the smaller 306130 assembly.