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CIR DTH bits (Down-the-Hole drill bits) are specially designed for low-pressure drilling applications. They are widely used in mining, quarrying, water well drilling, and construction projects. Manufactured from premium alloy steel and fitted with high-quality tungsten carbide buttons, CIR DTH bits deliver fast penetration rates, low air consumption, and long service life.
YKdrill offers a full range of CIR DTH bits from CIR65 to CIR170, suitable for drilling hard, medium-hard, and soft rock formations.
High Efficiency – Optimized internal structure ensures maximum energy transfer and faster drilling speed.
Low Air Consumption – Designed for low-pressure compressors, reducing operation cost.
Durable Materials – Made from superior alloy steel with advanced heat treatment for strength and wear resistance.
Long Service Life – High-grade tungsten carbide buttons resist wear and impact for extended bit life.
Easy Maintenance – Simple structure, easy to disassemble and replace, low failure rate.
Versatile Applications – Suitable for drilling blast holes, anchor holes, foundation projects, and water wells.
| Head Shape | Diameter of button face（mm) | Shank Length | Spline | NO.Air Holes | Button Type | Gauge Buttons | Front buttons | Weight（Kg） | |
| CIR65 | Flat Face | 65 | 105 | 4 | 2 | Spherical | 4XΦ12 | 2XΦ12 | 1.5 |
| Flat Face | 68 | 105 | 4 | 2 | Spherical | 4XΦ12 | 2XΦ12 | 1.6 | |
| CIR70 | Flat Face | 76 | 111 | 4 | 2 | Spherical | 6XΦ12 | 4XΦ11 | 2 |
| Convex Face | 85 | 111 | 4 | 2 | Spherical | 6XΦ13 | 2XΦ12+2XΦ11 | 2.3 | |
| CIR90 | Convex Face | 90 | 130 | 6 | 2 | Spherical | 6XΦ14 | 2XΦ13+2XΦ12 | 3.75 |
| Concave Face | 110 | 130 | 6 | 2 | Ballistic | 6XΦ14 | 6XΦ13 | 4.8 | |
| CIR110 | Concave Face | 110 | 140 | 6 | 2 | Ballistic | 6XΦ14 | 6XΦ13 | 6.2 |
| Concave Face | 130 | 140 | 6 | 2 | Ballistic | 8XΦ14 | 4XΦ14+3XΦ13 | 8.05 | |
| Flat Face | 140 | 140 | 6 | 2 | Ballistic | 8XΦ14 | 8XΦ14 | 9 | |
| CIR150 | Convex Face | 155 | 170 | 6 | 3 | Ballistic | 9XΦ16 | 10XΦ14 | 16.7 |
| Convex Face | 165 | 170 | 6 | 3 | Ballistic | 9XΦ16 | 10XΦ14 | 17.55 | |
| Convex Face | 178 | 170 | 6 | 3 | Ballistic | 9XΦ16 | 6XΦ16+6XΦ14 | 18.85 | |
| CIR170 | Convex Face | 195 | 170 | 6 | 3 | Ballistic | 9XΦ16 | 6XΦ16+8XΦ14 | 24.2 |
| Convex Face | 203 | 170 | 6 | 3 | Ballistic | 9XΦ16 | 6XΦ16+10XΦ14 | 26.35 |
(Custom diameters and button configurations are available upon request.)
Mining & Quarrying – Blast holes, production drilling.
Construction Projects – Anchor holes, foundation piles, slope stabilization.
Water Well Drilling – Shallow to medium depth boreholes.
Geothermal & Infrastructure – Tunnels, roads, and other engineering projects.
Over 15 years of drilling tools manufacturing experience.
Strict quality control and ISO-certified production process.
Competitive price with reliable performance.
Customization available according to customer needs.
Professional after-sales service and technical support.
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