S series Mining bit

9 7/8 K7 Mining bit

The strength and wear resistance of inserts are improve by using carbide inserts with high strength and high wear resistance.

Surface of the high precision bearing heat treated by using advanced heat treatment process to improve the load capacity and service life of the bearing.

The service life of the bearing is further extended by adopting harder and mort wear resistant material for thrust bearing.

Preventing reflux structure has dual function, it can avoid air counterflow and dust entering into bearing when the air-compressor stop working accidentally, and separate air and water in order to avoid water entering into bearing when it works normally to prolong the life of bearing.

Uses and applicable ranges of the bit

Uses: The bit is used for air drilling, e.g., for drilling operations in open coal mine, iron mine and non-ferrous mine. Applicable ranges: The bit is applicable for drilling hard and very hard formations with high compressive strength and high abrasiveness , such as magnetite quartzite, granite, hard sandstone, dolomite, chert and ironstone, etc.

Recommended drilling parameters

Weight on bit(WOB):35000-65000 Ibs

Rotary speed: 90-65RPM

Basic specifications of the bit

IADC code: 8-3-2

Type of the bearing: roller-ball-roller-thrust button

Cutting structure:

  Top row and inner rows: ovoid compacts

  Heel row: ovoid compacts