Product Details

Basical Parameter
Bit Size	8 3/4"(222MM)
IADC Code	127
Tooth Type	Steel /Milled Tooth
Bearing Type	Elastomer Sealed Bearing
Connection	4 1/2"API reg pin
Rotary Speed(rpm)	180~80
Weight on Bit(KN/MM)	0.35~1.00
Formation	low compressive strength,high drill-ability and soft formation,like shale,clay,salt rock and soft limestone,etc.

8 3/4inches is a regular size in water well drilling, it is working well with small capacity drilling rigs and widely used in the world.

Steel tooth tricone rock bit is also named milled tooth tricone rock bit could drill soft mudstone, even soft limestone, the cones are hard faced by tungsten carbide, the bearing is journal and locked by ball, high grade elastomer(rubber)-HNBR O-ring sealed bearing, grease compensating system lubricate the bearing , the working life is very long.

Application

Well Drilling Water Well Drilling

IADC	Rock formation	WOB (KN/mm)	WOB (KN/mm)
116/117	Low compressive strength, high drill-ability and extremely soft formation, like soft shale, clay, conglomerate etc.	0.35~0.90	180~80
126/127	Low compressive strength, high drill-ability and soft formation, like shale, clay, soft limestone, salt rock, etc.	0.35~1.00	180~80
136/137	Soft to medium soft with low compressive strength or soft with hard interlayer, like anhydrite, soft limestone,sandstone, etc.	0.37~1.05	130~60
216/217	Medium hard formation with relatively high compressive strength and hard interlayer, like hard shale, sandstone, limestone, etc.	0.5~1.20	100~50