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MSD supplies top hammer reaming bits from R32 to ST68, with dome and pilot designs for enlarging pilot holes in mining, tunneling and quarrying.
MSD manufactures top hammer reaming bits for enlarging an existing pilot hole to the required final diameter in rock drilling. The confirmed product range covers R32, R35, T38, T45, T51, ST58 and ST68 thread systems, with dome and pilot reaming bit configurations available for different drilling requirements. Available reaming button bits vary by reaming diameter, button layout, flushing-hole arrangement and weight. To select the correct configuration, provide the thread system, pilot-hole diameter, required final hole diameter, drill rig or rock drill model and rock formation.
Button layout is shown as Gauge and Front. Flushing holes are shown as Side and Front. "None" means there is no hole in that position.
| Image | Diameter (mm) | Diameter (inch) | Buttons (Gauge / Front) | Flushing Holes (Side / Front) | Weight (kg) |
|---|---|---|---|---|---|
Dome Reaming Bit Image | 76 | 3" | 9 x 13 + 1 x 12 | Side: None; Front: 2 | 2 |
| 89 | 3 1/2" | 8 x 12.7 + 7 x 12.7 | Side: 2; Front: 4 | 3 | |
| 102 | 4" | 8 x 13 + 7 x 13 | Side: None; Front: 5 | 3.7 | |
| 102 | 4" | 8 x 13 + 9 x 13 | Side: 2; Front: 4 | 3.8 | |
| 102 | 4" | 14 x 12 + 3 x 10 | Side: None; Front: 2 | 3.6 |
| Image | Diameter (mm) | Diameter (inch) | Buttons (Gauge / Front) | Flushing Holes (Side / Front) | Weight (kg) |
|---|---|---|---|---|---|
Pilot Reaming Bit Image | 76 | 3" | 12 x 12 + 4 x 10 | Side: None; Front: 2 | 2.5 |
| 89 | 3 1/2" | 12 x 12 + 4 x 10 | Side: None; Front: 2 | 3.4 | |
| 102 | 4" | 12 x 13 + 3 x 10 | Side: None; Front: 4 | 3.4 | |
| 102 | 4" | 14 x 12 + 3 x 10 | Side: None; Front: 2 | 3.8 | |
| 102 | 4" | 8 x 14 + 7 x 12 | Side: None; Front: None | 4.8 |
| Image | Dimensions D (mm) | Flushing Hole (Front) | Flushing Hole (Gauge) | Buttons (Front) | Buttons (Gauge) | Angle |
|---|---|---|---|---|---|---|
Pilot Bit 12° Taper Image | 41 | 2×5 | 2×5.5 | 2×8 | 4×9 | 30° |
| Image | Dimensions D (mm) | Flushing Hole (Front) | Flushing Hole (Gauge) | Buttons (Front) | Buttons (Gauge) | Angle |
|---|---|---|---|---|---|---|
Reaming Bit 12° Taper Image | 89 | - | - | 4×10 | 8×11 | 35° |
| 102 | - | - | 4×12 | 8×12 | 35° |
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Read MoreMSD top hammer reaming bits are used to enlarge an existing pilot hole to the required final diameter in rock drilling. The range includes reaming button bits for mining, quarrying, tunneling, and drilling-and-blasting applications.
A reaming bit for rock drilling must be matched according to the pilot-hole diameter, required final diameter, thread connection, and drilling system. Products with the same thread can have different reaming diameters, button layouts, flushing-hole arrangements, and weights.
MSD supplies confirmed dome and pilot reaming bit configurations. Available options vary by reaming diameter, gauge and front button layout, flushing-hole arrangement, and weight.
The product tables show the confirmed configuration under each thread system. Select the complete parameter row rather than matching a reaming bit only by appearance or thread designation.
The confirmed product range covers R32, SR35, T38, T45, T51, ST58, and ST68 thread systems. Available reaming diameters range from 76 to 254 mm, depending on the thread and configuration.
The R32 reaming bit range includes dome and pilot options from 76 to 102 mm. Larger selected configurations are available under T38, T45, T51, ST58, and ST68 for different finished-hole requirements.
To confirm the correct reaming bit, provide the pilot-hole diameter, required final reaming diameter, thread system, rock drill or drill-rig model, current drill rod and connection details, rock formation, drilling application, and required quantity.
Current product markings, dimensions, drawings, or clear photos can also help confirm the replacement configuration. MSD is a China-based top hammer reaming bit manufacturer and supplier providing technical selection and quotation support.
Technical content reviewed by MSD Engineering Team. | MSD - 23+ years of rock drilling tools manufacturing expertise | ISO 9001 Certified | Exporting to 40+ countries
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