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8 1/2" SGA635

8 1/2" SGA635 is part of mining tri-cone drill bit, which is mainly used in large open-pit mining operations, such as open-pit coal mine, copper mine, molybdenum mine, iron ore mine and other non-ferrous metal mine.

PRODUCT SPECIFICATION

CUTTING STRUCTURE
Conical on gage, double spherical on inner rows.
Designed for high compressive strength, medium hard and abrasive formations, such as limestone, sandstone, interbedded dolomite.
Compressive strength: 29,000-38,000 psi/200-262 MPa
SHIRTTAIL PROTECTION
Hard welding and wear resistant carbide protection on shirttail lip and lug
PRODUCT SPECIFICATION
IADC Code:  635
Bearing Type: Roller-Ball-Roller-Thrust Button/Sealed Bearing
Circulation Type: Jet Air
Cutting Structure:
Inner and Nose Rows: Double spherical
Gage Rows: Conical
Gage Bevel Protection: Ovoid
Pin Connection: 4 1/2″ API REG
Metric Bit Diameter: 216 mm
Product Weight: 84 lbs/38 kg
OPERATING SUGGESTIONS 
Weight on Bit: 25,500-51,000 lbs/11.6-23.1 T
Rotational Speed: 60-100 rpm
Air Back Pressure: 29-58 psi/0.2-0.4 MPa

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