Tapered Drill Bits
Tapered drill bits connect to a rock drill through a matching tapered drill rod, forming a compact top hammer drilling system for rock breaking and borehole formation. SPM supplies tapered button bits in 7°, 11° and 12° taper angles, with different bit diameters, button arrangements and flushing configurations for varied drilling conditions.
The available catalog range covers bit diameters from 28 mm to 45 mm. A 35° gauge angle is used across the listed tapered bit series, with different gauge and front button layouts selected according to the required diameter and drilling configuration.
Tapered drill bits are used with matching tapered rods for rock drilling in mining, quarrying, tunneling and construction. They are suited to compact top hammer drilling systems where bit diameter, taper angle and button configuration need to be matched to the rock drill and formation conditions.
SPM's catalog includes three taper-angle series. The summary below provides a quick view of the available diameter, weight and length ranges.
- ✓
7°Tapered Button Bits
View specificationsSpecifications shown belowBit Diameter28-45 mm
Length Range50-71 mm
- ✓
11°Tapered Button Bits
View specificationsSpecifications shown belowBit Diameter28-45 mm
Length Range50-65 mm
- ✓
12°Tapered Button Bits
View specificationsSpecifications shown belowBit Diameter28-45 mm
Length Range50-71 mm
| Part No. | Diameter (mm) | Bit Diameter (in.) | Gauge Buttons (mm) | Front Buttons (mm) | Flushing Holes Gauge | Flushing Holes Front | Gauge Angle | Weight (kg) | Length (mm) |
|---|---|---|---|---|---|---|---|---|---|
| 28 | 1 1/10" | 4×7 | 2×7 | 1 | 2 | 35° | 0.28 | 60 | |
| 30 | 1 3/16" | 5×7 | 2×7 | 1 | 1 | 35° | 0.3 | 60 | |
| 32 | 1 1/4" | 5×7 | 2×7 | 1 | 2 | 35° | 0.33 | 60 | |
| 32 | 1 1/4" | 6×7 | 2×7 | 1 | 2 | 35° | 0.34 | 60 | |
| 33 | 1 19/64" | 5×7 | 2×7 | 1 | 2 | 35° | 0.35 | 60 | |
| 34 | 1 11/32" | 5×7 | 2×7 | 1 | 2 | 35° | 0.36 | 60 | |
| 34 | 1 11/32" | 4×7 | 2×7 | 1 | 2 | 35° | 0.37 | 60 | |
| 36 | 1 27/64" | 5×8 | 2×7 | 1 | 2 | 35° | 0.34 | 50 | |
| 38 | 1 1/2" | 5×9 | 2×7 | 1 | 1 | 35° | 0.36 | 50 | |
| 38 | 1 1/2" | 3×9 | 1×9 | 2 | 1 | 35° | 0.36 | 50 | |
| 40 | 1 37/64" | 3×9 | 1×9 | 2 | 1 | 35° | 0.38 | 65 | |
| 40 | 1 37/64" | 3×9 | 2×9 | 2 | 1 | 35° | 0.39 | 65 | |
| 40 | 1 37/64" | 4×8 | 2×8 | 2 | 2 | 35° | 0.38 | 65 | |
| 40 | 1 37/64" | 5×9 | 2×8 | 1 | 1 | 35° | 0.4 | 65 | |
| 40 | 1 37/64" | 3×9 | 1×9 | 2 | 1 | 35° | 0.38 | 65 | |
| 41 | 1 5/8" | 5×9 | 2×8 | 1 | 1 | 35° | 0.42 | 65 | |
| 42 | 1 21/32" | 3×9 | 1×9 | 2 | 1 | 35° | 0.42 | 65 | |
| 42 | 1 21/32" | 3×9 | 1×9 | 2 | 1 | 35° | 0.43 | 65 | |
| 42 | 1 21/32" | 4×8 | 2×8 | 2 | 2 | 35° | 0.42 | 65 | |
| 43 | 1 11/16" | 5×9 | 2×9 | 1 | 1 | 35° | 0.45 | 60 | |
| 45 | 1 3/4" | 5×9 | 2×9 | 1 | 1 | 35° | 0.49 | 60 | |
| 41 | 1 5/8" | 5×9 | 2×8 | 1 | 1 | 35° | 0.48 | 71 | |
| 41 | 1 5/8" | 6×8 | 3×8 | 1 | 1 | 35° | 0.48 | 71 |
| Part No. | Diameter (mm) | Bit Diameter (in.) | Gauge Buttons (mm) | Front Buttons (mm) | Flushing Holes Gauge | Flushing Holes Front | Gauge Angle | Weight (kg) | Length (mm) |
|---|---|---|---|---|---|---|---|---|---|
| 28 | 1 1/10" | 4×7 | 2×7 | 1 | 2 | 35° | 0.28 | 60 | |
| 30 | 1 3/16" | 5×7 | 2×7 | 1 | 1 | 35° | 0.3 | 60 | |
| 32 | 1 1/4" | 5×7 | 2×7 | 1 | 2 | 35° | 0.33 | 60 | |
| 32 | 1 1/4" | 6×7 | 2×7 | 1 | 2 | 35° | 0.34 | 60 | |
| 33 | 1 19/64" | 5×7 | 2×7 | 1 | 2 | 35° | 0.35 | 60 | |
| 34 | 1 11/32" | 5×7 | 2×7 | 1 | 2 | 35° | 0.36 | 60 | |
| 34 | 1 11/32" | 4×7 | 2×7 | 1 | 2 | 35° | 0.37 | 60 | |
| 36 | 1 27/64" | 5×8 | 2×7 | 1 | 2 | 35° | 0.34 | 50 | |
| 38 | 1 1/2" | 5×9 | 2×7 | 1 | 1 | 35° | 0.36 | 50 | |
| 40 | 1 37/64" | 5×9 | 2×8 | 1 | 1 | 35° | 0.4 | 65 | |
| 41 | 1 5/8" | 5×9 | 2×8 | 1 | 1 | 35° | 0.42 | 65 | |
| 45 | 1 3/4" | 5×9 | 2×9 | 1 | 1 | 35° | 0.49 | 60 |
| Part No. | Diameter (mm) | Bit Diameter (in.) | Gauge Buttons (mm) | Front Buttons (mm) | Flushing Holes Gauge | Flushing Holes Front | Gauge Angle | Weight (kg) | Length (mm) |
|---|---|---|---|---|---|---|---|---|---|
| 28 | 1 1/10" | 4×7 | 2×7 | 1 | 2 | 35° | 0.28 | 60 | |
| 30 | 1 3/16" | 5×7 | 2×7 | 1 | 1 | 35° | 0.3 | 60 | |
| 32 | 1 1/4" | 5×7 | 2×7 | 1 | 2 | 35° | 0.33 | 60 | |
| 32 | 1 1/4" | 6×7 | 2×7 | 1 | 2 | 35° | 0.34 | 60 | |
| 33 | 1 19/64" | 5×7 | 2×7 | 1 | 2 | 35° | 0.35 | 60 | |
| 34 | 1 11/32" | 5×7 | 2×7 | 1 | 2 | 35° | 0.36 | 60 | |
| 34 | 1 11/32" | 4×7 | 2×7 | 1 | 2 | 35° | 0.37 | 60 | |
| 36 | 1 27/64" | 5×8 | 2×7 | 1 | 2 | 35° | 0.34 | 50 | |
| 38 | 1 1/2" | 5×9 | 2×7 | 1 | 1 | 35° | 0.36 | 50 | |
| 40 | 1 37/64" | 5×9 | 2×8 | 1 | 1 | 35° | 0.4 | 65 | |
| 41 | 1 5/8" | 5×9 | 2×8 | 1 | 1 | 35° | 0.42 | 65 | |
| 43 | 1 11/16" | 5×9 | 2×9 | 1 | 1 | 35° | 0.45 | 60 | |
| 45 | 1 3/4" | 5×9 | 2×9 | 1 | 1 | 35° | 0.49 | 60 | |
| 41 | 1 5/8" | 5×9 | 2×8 | 1 | 1 | 35° | 0.48 | 71 | |
| 41 | 1 5/8" | 6×8 | 3×8 | 1 | 1 | 35° | 0.48 | 71 |
The catalog compares ballistic, conical and spherical button shapes according to rock hardness, rock abrasiveness and penetration rate. It also lists different button layouts and face configurations. Selection should therefore consider the formation, required hole diameter, matching taper angle and the operating characteristics of the rock drill rather than diameter alone.
For additional product information and selection guidance, download the full Top Hammer Drilling Tools catalog.