Product Description
The 133mm four-wing PDC concave drill bit is the largest diameter in the concave-crown PDC range for underground coal mining. At 133mm, this bit drills coal measure formations — interbedded mudstone, siltstone, fine sandstone, and coal — for ventilation holes, drainage holes, and exploration drilling in underground workings where rotary drilling equipment must fit through access roadways with restricted headroom.
The concave crown profile is the defining characteristic that distinguishes this bit from flat-top PDC geometry. The inward-curving crown surface contacts the formation at the outer edge first when drilling begins, creating a smaller initial contact area that concentrates cutting force on a reduced surface. This reduces startup torque by 25-30% compared to flat-face PDC geometry at the same WOB — a critical advantage in underground coal drilling where electric motors or compressed-air motors have limited torque output and stall protection circuits shut down the drill if torque exceeds threshold.
Four-wing construction provides higher cutter density than three-wing alternatives at 133mm diameter — 20-25% more cutter-to-formation contact points at any given rotation position. This translates to more uniform penetration through interbedded sequences where single hard layers would cause a three-wing bit to bounce as each blade contacts the hard layer in sequence rather than simultaneously.
For more on cutter specifications and selection, see PDC cutters for mining and hard rock applications
Primary applications
ventilation and drainage hole drilling in underground coal mines, coal seam exploration holes where 133mm borehole diameter accepts standard coal core tubes, in-seam directional drilling programs where the 133mm diameter fits between support pillars, and rock bolt pre-drilling in competent mudstone above coal seams. This bit suits formations up to 100 MPa — harder rock requires a tricone or DTH percussion approach.
Project View
Diamond composite disc (PDC) is a special superhard material synthesized by synthetic diamond and hard alloy under high temperature conditions. It not only has the advantages of high hardness and wear resistance of diamond, but also has the characteristics of strong impact resistance and large cutting edge of hard alloy. Using it as the blade of the drill bit can greatly improve the work efficiency of the drill bit, making it an ideal drill bit for drilling in hard rock layers and hard rock layers.
Factory Price High Resistant Rapid Chip Removal 133mm 4-wing PDC Bit PDC Blade Bit
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