Pilot hole size – in (mm) |
5.25 (133.35) |
6.25 (158.75) |
7.5–8.00 (191–203) |
Rear joint |
2-3/8 API REG PIN |
3-1/2 API IF PIN |
3-1/2 API IF PIN |
Length without bit – in (mm) |
39.15 (994.3) |
42 (1,066.8) |
44.6 (1,132.8) |
Weight without bit – lb (kg) |
107 (49) |
132 (60) |
200 (91) |
Body casing diameter – in (mm) |
3.94 (100) |
4.60 (116.80) |
5.44 (138) |
Piston weight – lb (kg) |
19.8 (9) |
31 (14.1) |
42.6 (19.3) |
Piston stroke – in (mm) |
3.94 (100) |
3.75 (95.3) |
3.75 (95.3) |
Max. make up torque – ft-lbs (N-m) |
4,000 (5,416) |
5,000 (6,770) |
6,000 (8,124) |
Lubrication |
80 weight rock drill oil |
80 weight rock drill oil |
80 weight rock drill oil |
Foot valve extension – in (mm) |
~2.25 (~57.2) |
~2.11 (~53.6) |
~2.31 (58.7) |
Max. air pressure – psi (bar) |
350 (24) |
350 (24) |
350 (24) |
Rotation speed* |
45–65 RPM |
40–60 RPM |
30–50 RPM |
Dry drilling water usage – gpm (lpm)** |
0.5–2.0 (1.9–7.6) |
0.5–2.0 (1.9–7.6) |
0.5–2.0 (1.9–7.6) |
Dry drilling lubrication usage |
1/3 pint/hour for every 100 SCFM (0.16 L/hour for every 2.8 m^3/min) |
1/2 pint/hour for every 100 SCFM (0.23 L/hour for every 2.8 m^3/min) |
1/2 pint/hour for every 100 SCFM (0.23 L/hour for every 2.8 m^3/min) |
Wet drilling water usage – gpm (lpm)*** |
2.0–5.0 (7.6–19.0) |
2.5–5.5 (9.46–20.82) |
3.5–7.0 (13.25–26.50) |
Wet drilling lubrication usage |
2/3 pint/hour for every 100 SCFM (0.32 L/hour for every 2.8 m^3/min) |
3/4 pint/hour for every 100 SCFM (0.35 L/hour for every 2.8 m^3/min) |
1.0 pint/hour for every 100 SCFM (0.47 L/hour for every 2.8 m^3/min) |
*The harder the rock, the slower the rotation. **Most effective. ***Clay, soft ground. |