Drop centre bits for T51 drill strings. A drop centre drills straighter holes in medium to hard rock. Diameters from 3 in (76 mm) to 5-1/2 in (140 mm). Hemispherical or semi-ballistic carbide.
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Thread
T51
Diameter
3 in (76 mm)
Face
Drop centre
Carbide
Hemispherical
Button layout
gauge 6 × 1/2 in, front 3 × 7/16 in
Flushing holes
5 front
OEM catalogue number
A44307
Shipping estimate
Used with
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