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QL80A Series DTH Drill Bits from YKDrill are specially engineered for large-diameter, high-performance rock drilling. Designed for use with 8-inch high-pressure DTH hammers, these bits deliver high penetration rates, excellent flushing efficiency, and long tool life, even in the most demanding geological conditions.
The bits feature concave or convex-concave face designs, equipped with domed tungsten carbide buttons for optimal impact resistance and wear durability, making them ideal for deep water wells, blast hole drilling, and foundation piling.
| Head Shape | Head Diameter (mm) | Shank Length (mm) | Spline | Port Holes | Button Type | Gauge Buttons | Front Buttons | Weight (Kg) |
|---|---|---|---|---|---|---|---|---|
| Concave Face | 203 | 331 | 16 | 2 | Domed | 10 × Ø18mm | 4 × Ø18mm + 10 × Ø16mm | 48.2 |
| Concave Face | 216 | 331 | 16 | 2 | Domed | 10 × Ø18mm | 4 × Ø18mm + 10 × Ø16mm | 51.9 |
| Concave Face | 230 | 331 | 16 | 2 | Domed | 12 × Ø18mm | 12 × Ø18mm + 6 × Ø16mm | 54.7 |
| Concave Face | 235 | 331 | 16 | 2 | Domed | 12 × Ø18mm | 12 × Ø18mm + 6 × Ø16mm | 55.3 |
| Concave Face | 254 | 331 | 16 | 2 | Domed | 12 × Ø18mm | 12 × Ø18mm + 8 × Ø16mm | 62.2 |
| Convex-Concave Face | 275 | 331 | 16 | 2 | Domed | 12 × Ø18mm | 8 × Ø16mm + 19 × Ø16mm | 68.8 |
| Convex-Concave Face | 305 | 331 | 16 | 3 | Domed | 15 × Ø18mm | 12 × Ø16mm + 23 × Ø16mm | 77.3 |
✅ QL80A Shank – Compatible with standard 8'' high-air-pressure DTH hammers
✅ Wide Diameter Range – From 203mm to 305mm for heavy-duty applications
✅ Domed Button Design – Enhanced resistance against wear and deformation
✅ Concave & Convex-Concave Face Options – For optimal alignment and rock-breaking efficiency
✅ Heavy-Duty Construction – Precision-forged & heat-treated for durability
✅ Optimized Air Flushing – Dual or triple port holes for clean boreholes
⛏️ Mining and Quarrying – Bench blasting and pre-split drilling
💧 Water Well Drilling – Deep and large-diameter boreholes
🌡️ Geothermal Drilling – High-pressure and high-temperature environments
🏗️ Foundation Engineering – Piling, anchoring, and support structures
🚧 Infrastructure Projects – Highways, tunnels, bridges, dams
Packing: Wooden case or iron frame
Minimum Order: 1 pc
Delivery Time: 7–12 working days
Shipping Options: Air freight, sea shipment, international courier
🏅 15+ Years in DTH Tool Manufacturing
🔧 Customizable Button Layout & Face Design
📦 Fast Lead Times & Global Delivery
🛡️ Rigorous Quality Control Standards
🌐 Trusted by Clients in 40+ Countries
Need reliable, large-diameter DTH bits for your toughest drilling challenges?
Reach out to YKDrill for quotes, samples, and expert advice.
💼 Company: YKDrill
📧 Email: ykdrill@ykdrill.com
🌐 Website: www.ykdrill.com
