12 1/4″ WHA417GT


Size: 12 1/4″ (311.15 mm)
IADC: 417
Bearing and Seal: Journal Bearing / O-Ring rubber seal
No. of Rows: 3-3-3
Inner Row: Chisel / 39 pcs
Gauge Row: Wedge / 38 pcs
Trimming Row: Wedge / 28 pcs
Bevel Row: Flat / 38 pcs
Pin Connection: 6 5/8 REG
Bit Weight (KG): 98.0
Weight on Bit (KN/mm): 0.35 ~ 0.90
ROP (rpm): 70 ~ 140



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– With high-strength and high-wear-resistance carbide inserts which are advanced in strength and wear-resistance.
– With new journal bearing structure which greatly prolongs the service life of the bearing, and has the ability to withstand medium drilling pressure and adapt to high rotational speed.
– With the new type of rubber sealing ring, it is more suitable for the working environment and operating parameters of tricone bits.
– T feature, a protection carbide inserts row is added between the outer rows and cone back rows for the purpose of cone protection and well wall dressing.