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8 1/2"
12 1/4"
IADC
537
637
837
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Welded type. 120 degree surface. Full coverage of engineered roller cone bits
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In the welding installation mode, the Angle of the palm back relative to the cylinder is 3~5°, and the installation sequence of the cone may follow the positive and negative alternation at most. Pay attention to the concentricity and height difference of the inner and outer rings of the drill bit. In the welding mode, it is suggested that the cone should be immersed in water or the temperature should be controlled by discontinuous welding to avoid high temperature damage to the sealing system.
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30~180MPa, strong, medium, breeze granite, sandstone, limestone, shale, dolomite, conglomerate, etc.
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Detachable type. Engineering drill bits with seat bolts
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Cylinder drill with mounting base flange, base with positioning pin hole and bolt connection fixing hole, installation using high strength bolt fixation and positioning pin fixation, when the roller is damaged, only need to disassemble the coupling bolt, take off the drill, and then replace a new drill.
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Detachable. Insert positioning pin type engineering roller cone bit
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First, the base is welded to the cylinder body to ensure the consistency of verticality and height difference between the base and the cylinder body, and the internal and external installation and welding are interrupted according to the installation direction (that is, follow the positive and negative alternating); Then insert the tooth sole into the base and drive into the positioning pin for easy disassembly.
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