Direct Overview: Kaishan DHD High Air Pressure DTH Bits are heavy-duty percussive rock drilling consumables engineered for large-scale open-pit mining, quarry blast holes, water well drilling, and civil foundation anchoring. Designed to operate at high working air pressures of 10 to 25 bar (1.0–2.5 MPa), they feature standard DHD shank connections (DHD3.5, DHD340, DHD350, DHD360, DHD380, and DHD112) across diameters from 3" to 12" (85 mm to 305 mm). Forged from high-grade structural alloy steel with premium virgin Tungsten Carbide inserts (spherical, ballistic, and parabolic), they deliver high penetration rates, exceptional wear resistance, and long service life in hard to abrasive formations (f=6–20).
In hard-rock open-pit mining, quarrying, and deep groundwater drilling, downtime caused by premature button loss, gauge wear, or body fatigue drastically inflates project costs. To maximize penetration rates and hole straightness under high-pressure pneumatic impact, drilling consumables must provide balanced impact toughness and abrasive wear resistance.
Manufactured by Kaishan Heavy Industry, the DHD Series High Air Pressure DTH Bits are precision-machined on multi-axis CNC centers and subjected to specialized vacuum heat treatment. Paired with DHD series high-pressure DTH hammers, the splined shank delivers smooth torque transfer with zero energy loss. Optimized air flushing channels discharge rock cuttings rapidly at the borehole collar, preventing secondary regrinding and maximizing bit life.
Bit bodies are hot-forged from specialized nickel-chromium-molybdenum alloy steel. Advanced carburizing and deep cryogenic heat treatment provide high surface hardness (HRC 58–62) backed by a shock-absorbing ductile core.
Fitted with top-tier micro-grain tungsten carbide buttons. Offers superior fracture toughness and wear resistance under continuous 25-bar percussive hammering in quartz-heavy granite and basalt.
Available in Spherical/Dome buttons (maximum wear resistance in abrasive hard rock), Ballistic buttons (high penetration in medium-hard rock), and Parabolic buttons for balanced performance.
Engineered with large radial flushing grooves and multi-port internal air passages. Directs high-velocity exhaust air across the cutting face, instantly evacuating rock flour and preventing bit overheating.
Standard 12-spline and 8-spline drive shanks conform to international DHD standards, fitting Kaishan, Atlas Copco, Sandvik, and Ingersoll-Rand high-pressure downhole hammers without modification.
Supplied in Concave (superb hole alignment and versatile all-round performance), Flat Face (hard abrasive ground), and Convex/Drop Center faces for accelerated drilling in fissured strata.
Heavy-Duty DHD Series Rock Drill Bits for Open-Pit Mining & Water WellsIn large-scale quarrying, civil blasting, and water well operations, drilling consumables must withstand continuous high-frequency percussion without premature button loss or body fatigue. Kaishan DHD drill bits are precision-machined on multi-axis CNC centers and treated with specialized vacuum carburization to achieve high surface hardness and superior shock absorption. Engineered to match international DHD shank standards, these bits pair with Kaishan and other global-brand downhole hammers. Their optimized face designs and high-velocity radial flushing channels discharge heavy rock cuttings quickly, preventing secondary bit regrinding and maximizing penetration efficiency. Engineering Highlights & MetallurgyAlloy Steel ForgingHot-forged from structural nickel-chromium-molybdenum alloy steel with vacuum heat treatment, ensuring high fatigue strength and eliminating bit body breakage. Virgin Cemented CarbidesEquipped with micro-grain tungsten carbide inserts in spherical (abrasive hard rock), ballistic (fast penetration), or parabolic shapes for balanced durability. High-Flow Flushing PortsPrecision internal air channels and radial grooves clear stone flour instantly from the borehole bottom, keeping working faces cool and reducing wear. Universal DHD Splined ShankPrecision splines ensure tight engagement with all standard DHD series hammers, delivering smooth torque transmission and effortless bit changes. Kaishan DHD Bit Specifications & Shank Selection
Industrial Applications & Factory Supply Terms
Supply Terms: Minimum Order Quantity: 1 set/pc | Packaging: Standard seaworthy export wooden cases/boxes | Delivery Time: 7–10 working days | Payment Terms: L/C, T/T, Western Union.
Frequently Asked Questions (FAQ)Q: How do I select between Concave and Flat Face designs?A: The Concave face is the all-around industry standard, offering superb hole deviation control in medium to hard formations. Flat Face designs are recommended for hard, abrasive, and fractured rock where gauge wear resistance is critical. Q: Are Kaishan DHD bits compatible with non-Kaishan hammers?A: Yes. Kaishan DHD bits are engineered strictly to standard DHD shank specifications and operate seamlessly with high-pressure hammers from major international manufacturers. 1. inch high air pressure DTH bits
2. inch high air pressure DTH bits
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5. inch high air pressure DTH bits
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