Thread R28
Top Hammer Drilling Tools for Drifting and Tunneling
Bit Diameter: 38mm-45mm
Length of drill rod: 2800mm-4310mm
Button bit design: Flat face, drop center, normal and retrac body.
Tungsten carbide (Buttons): Spherical, ballistic and conical.
Applications: Drifting, tunneling, bench
We have different designs for various rock formations, and a longer service life to decrease use costs for users.
| Button bit | Dimensions D | Flushing hole (mm) | Buttons (mm) | Angle | Class | Part no. | |||
| mm | in | Front No size | Gauge No size | Front.,No size | Gauge.,No size | ||||
| 38 41 43 45 | 1 1/2 1 5/8 1 11/16 1 3/4 | 1×5 1×5 1×5 1×5 | 2×5 2×5 2×5 2×5 | 2×7 2×8 2×8 2×9 | 5×9 5×9 5×10 5×11 | 30° 30° 30° 30° | H H H H | 3038R2807 3041R2807 3043R2807 3045R2807 | |
| 41 | 1 5/8 | 2×5.5 | 2×5 | 2×8 | 6×9 | 30° | S | 3041R2808 | |
| 43 45 | 1 11/16 1 3/4 | 3×5 3×5 | - 1×5 | 3×8 3×8 | 6×9 6×10 | 30° 30° | M M | 3043R2809 3045R2809 | |
| Reaming tools | |||||||||
| Pilot bit 6° taper | 40 | 1 37/64 3 | 2×5 | 2×5.5 | 2×8 | 4×9 | 30° | - | 3040R2806KP |
| Reaming bit 6° taper | 76 | 3 | - | - | - | 8×11 | 35° | - | 3076R2808KR |
| Dome bit | 76 | 3 | 2×9 | 2×7 | 1×11 | 14×11 | 35° | - | 3076R2815KD |
| Drill rod | Dimensions L | Dimensions D | Part no | |||
| mm | ft | in | mm | in | ||
| Hex rod 28 with thread R28/ R32 | 2800 3100 3700 | 9 10 12 | 2 2 2 | 28 28 28 | 1 1/8 1 1/8 1 1/8 | 2128R32R2828 2128R32R2831 2128R32R2837 |
| Hex rod 32 with threads R28/ R32 | 4310 | 14 | 2 | 32 | 1 1/4 | 2132R32R2843 |
| Coupling | L (mm) | Dimensions D | Part no | |
| mm | in | |||
| R32-R28 | 160 | 37 | 1 29/64 | MX-R283716 |
| Crossover coupling R28-R32 | 171 | 45 | 1 3/4 | MX-R28R324517 |
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