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Brunner & Lay B60 button bit, drop centre, retrac, 8 gauge + 4 mid + 3 centre buttons, 4 front flushing holes (render)
  • Brunner & Lay B60 button bit, drop centre, retrac, 8 gauge + 4 mid + 3 centre buttons, 4 front flushing holes (render)
  • Brunner & Lay B60 button bit, drop centre, retrac, 8 gauge + 4 mid + 3 centre buttons, 4 front flushing holes (render)

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Brunner & Lay B60 Drop Centre Retrac Bits

Brunner & Lay · Top hammer bits

Brunner & Lay B60 Drop Centre Retrac Bits

Part no.
S4060DWS

Drop centre retrac bits for B60 drill strings. A drop centre drills straighter holes in medium to hard rock. Retrac skirts help in broken ground, keep holes straighter and make the bit easier to retrieve. Diameters from 4 in (102 mm) to 6 in (152 mm). Hemispherical carbide.
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Dimension drawing: Brunner & Lay B60 Drop Centre Retrac Bits Thread B60 (female). Diameter 4 in (102 mm). Ø 4 in (102 mm) B60
ThreadB60
Diameter4 in (102 mm)
FaceDrop centre, retrac
CarbideHemispherical
Button layoutgauge 8 × 9/16 in, mid 4 × 9/16 in, centre 3 × 1/2 in
Flushing holes4 × 7/16 in front
Weight14.6 lb (14.55 lb)

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