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Brunner & Lay R28 button bit, crown, 6 gauge + 3 mid + 3 centre buttons, 4 front flushing holes (render)
  • Brunner & Lay R28 button bit, crown, 6 gauge + 3 mid + 3 centre buttons, 4 front flushing holes (render)
  • Brunner & Lay R28 button bit, crown, 6 gauge + 3 mid + 3 centre buttons, 4 front flushing holes (render)

3D render from OEM drawings, not a photograph.
Brunner & Lay R28 Crown Bits

Brunner & Lay · Top hammer bits

Brunner & Lay R28 Crown Bits

Part no.
S3011CA

Crown bits for R28 drill strings. A crown face penetrates fast in softer rock. Diameter 3 in (76 mm). Hemispherical carbide.
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Dimension drawing: Brunner & Lay R28 Crown Bits Thread R28 (female). Diameter 3 in (76 mm). Ø 3 in (76 mm) R28
ThreadR28
Diameter3 in (76 mm)
FaceCrown
CarbideHemispherical
Button layoutgauge 6 × 1/2 in, mid 3 × 7/16 in, centre 3 × 3/8 in
Flushing holes3 × 5/16 in front, 1 × 1/4 in side
Weight2.6 lb (2.65 lb)

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