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Brunner & Lay R25 button bit, modified chisel, 5 gauge + 2 centre buttons, 1 front flushing hole (render)

3D render from OEM drawings, not a photograph.

Brunner & Lay · Top hammer bits

Brunner & Lay R25 Modified Chisel Bits

Part no.

S03310M

Modified chisel bits for R25 drill strings. Diameters from 1-3/10 in (33 mm) to 1-7/8 in (48 mm).

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Dimension drawing: Brunner & Lay R25 Modified Chisel Bits Thread R25 (female). Diameter 1-3/10 in (33 mm). Ø 1-3/10 in (33 mm) R25
ThreadR25
Diameter1-3/10 in (33 mm)
FaceModified chisel
Button layoutgauge 5 × 9/32 in, centre 2 × 1/4 in
Flushing holes1 × 5/32 in front, 2 × 3/16 in side
Weight1.0 lb (0.99 lb)

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