7 7/8″ CHV637YT



Size: 7 7/8″ (200 mm)
IADC: 637
Bearing & Seal: Journal Bearing / Composite seal
Number of Rows: 5-5-4
Inner Row: Ovoid / 110 pcs
Gauge Row: Ovoid / 44 pcs
Trimming Row: Wedge / 24 pcs
Bevel Row: Flat / 44 pcs
Bit Weight: 9.5
Weight on Bit: 0.2~0.37
ROP: 60~130



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This product is used for cutting parts of roller cone reamers, which can be used for trenchless horizontal drilling and shaft drilling.

Suitable for high compressive strength, moderately hard and highly abrasive formations, such as limestone, dolomite, sandstone, chert, etc.

– With new journal bearing structure which greatly prolongs the service life of the bearing, and has the ability to withstand high drilling pressure and adapt to high rotational speed.
– The performance of the new fluorinated composite sealing ring is improved, and it is more suitable for the working environment and use parameters of the roller cone bit.
– The new sealing structure matches the bearing, thus greatly improving the service life of the drill bit.
– Y feature, the main cutting teeth of the cone are conical teeth, which have strong fracture resistance and formation penetration ability, and are suitable for drilling in hard and brittle formations and gravel interlayers.
– T feature, there is a trimming row between the gauge row and bevel row to protect the cones and trim the well wall.