Crown bits for T45 drill strings. A crown face penetrates fast in softer rock. Diameters from 3 in (76 mm) to 4-1/2 in (115 mm). Hemispherical or ballistic carbide.
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Thread
T45
Diameter
3 in (76 mm)
Face
Crown
Carbide
Hemispherical
Button layout
gauge 6 × 1/2 in, mid 3 × 1/2 in, centre 2 × 1/2 in
Flushing holes
1 × 7/16 in front, 2 × 3/8 in side
Weight
5.1 lb (5.07 lb)
Shipping estimate
Used with
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