7/12 Degree Tapered Rock Drill Button Bits 32-42mm for Coal Mining and Tunneling
Professional 7/12 degree tapered rock drill button bits designed for coal mining applications. These top hammer drilling tools are engineered for optimal performance in demanding rock drilling operations.
- Constructed from high-quality carbide and special steel materials
- Compatible with light rock drills for drilling rock holes up to 50mm diameter
- Wide application range including metallurgical mines, geological exploration, water conservancy construction, power projects, transportation, tunnels, quarries, and national defense stone engineering
| Bit Dia. (mm) | Bit Dia. (inch) | Front No.×Button Dia. | Gauge No.×Button Dia. | Angle | Front Flushing Hole | Side Flushing Hole | Skirt Type |
|---|---|---|---|---|---|---|---|
| 32 | 1 1/4 | 1×8 | 3×8 | 35° | 1 | 1 | Short Skirt |
| 33 | 1 19/64 | 2×7 | 5×7 | 35° | 2 | 1 | Short Skirt |
| 34 | 1 11/32 | 2×7 | 4×7 | 40° | 1 | 1 | Short Skirt |
| 35 | 1 3/8 | 2×7 | 5×8 | 35° | 1 | 1 | Short Skirt |
| 36 | 1 27/64 | 1×8 | 3×9 | 40° | 1 | 1 | Short Skirt |
| 36 | 1 27/64 | 2×7 | 5×8 | 35° | 1 | 1 | Short Skirt |
| 38 | 1 1/2 | 1×8 | 3×9 | 35° | 1 | 1 | Short Skirt |
| 38 | 1 1/2 | 2×7 | 5×8 | 35° | 1 | 1 | Short Skirt |
| 38 | 1 1/2 | 2×7 | 5×9 | 40° | 2 | 1 | Short Skirt |
| 40 | 1 37/64 | 1×8 | 3×9 | 30° | 1 | 1 | Short Skirt |
| 40 | 1 37/64 | 1×9 | 3×10 | 30° | 1 | 1 | Short Skirt |
| 40 | 1 37/64 | 1×9 | 3×9 | 35° | 1 | 1 | Short Skirt |
| 40 | 1 37/64 | 2×7 | 5×9 | 35° | 1 | 1 | Short Skirt |
| 42 | 1 21/32 | 1×8 | 3×9 | 30° | 1 | 1 | Short Skirt |
| 42 | 1 21/32 | 1×9 | 3×10 | 30° | 1 | 1 | Short Skirt |
| 42 | 1 21/32 | 1×9 | 3×9 | 35° | 1 | 1 | Short Skirt |
| 42 | 1 21/32 | 2×8 | 5×9 | 35° | 1 | 1 | Short Skirt |
| 32 | 1 1/4 | 2×7 | 5×7 | 35° | 1 | 1 | Long Skirt |
| 33 | 1 16/64 | 2×7 | 5×7 | 35° | 1 | 1 | Long Skirt |
| 35 | 1 3/8 | 2×7 | 5×8 | 35° | 1 | 1 | Long Skirt |
| 38 | 1 1/2 | 2×7 | 5×9 | 35° | 1 | 1 | Long Skirt |
| 41 | 1 5/8 | 2×7 | 5×9 | 35° | 1 | 1 | Long Skirt |
Kelleg is a market-oriented enterprise integrating R&D, design, procurement, sales, and customer service. We specialize in geotechnical anchoring and are committed to building a professional service platform that integrates system solutions, product supply, and technical support. Our professional teams provide comprehensive services including pre-sale technical consultation, product selection guidance, order management, and on-site technical support.
We generally have no minimum order quantity requirements.
100% strict inspection and testing for every order before packing.
1-3 days for products in stock; regular order delivery in 2-3 weeks.
Our sales team responds within 24 hours (holidays excluded), technical support available at any time, and free replacement provided for confirmed quality-related failures.
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