12 1/4″ DHA527GK


Size: 12 1/4″ (311.15 mm)
IADC: 527
Bearing and Seal: Journal Bearing / O-Ring rubber seal
No. of Rows: 4-4-4
Inner Row: Chisel / 189 pcs
Gauge Row: Wedge / 69 pcs
Bevel Row: Flat / 69 pcs
Pin Connection: 6 5/8 REG
Bit Weight (KG): 98.0
Weight on Bit (KN/mm): 0.35 ~ 1.05
ROP (rpm): 50 ~ 120



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– 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 andhigh-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.
– K feature, the inner row adopts wide-topped spoon insert, which increases the cutting width of the insert and improves the drilling efficiency.