5 1/2″ DHA537GT


Size: 5 1/2″ (139.7 mm)
IADC: 537
Bearing and Seal: Journal Bearing / O-Ring Rubber seal
No. of Rows: 4-4-3
Inner Row: Chisel / 60 pcs
Gauge Row: Wedge / 37 pcs
Trimming Row: Wedge / 9 pcs
Bevel Row: Ovoid / 56 pcs
Pin Connection: 2 7/8 REG
Bit Weight (KG): 14.5
Weight on Bit (KN/mm): 0.40~1.05
ROP (rpm): 40~110



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Suitable for low compressive strength, medium soft, and hard abrasive interbed formations, such as hard shale, anhydrite, soft limestone, sandstone, dolomite with interlayers, etc.


– Adopt high strength and high wear resistance carbide inserts
– Adopting the Journal bearing structure, it has the ability to withstand medium WOB and adapt to higher ROP
– The O-ring seal is made of wear-resistant and high-temperature-resistant fluorinated high-saturated nitrile rubber, which effectively improves the reliability of the bearing seal and thus increases the service life of the drill bit
– The oil storage system can balance the pressure difference inside and outside the bearing, and provide good lubrication guarantee for the bearing system
– T feature, there is a trimming row between the gauge row and bevel row to protect the cones and trim the well wall.