The H25 Tapered Drill Rod (Hex 25mm) is a heavy-duty drill steel designed for high-impact drilling. Unlike standard rods, Topking H25 rods undergo a special Carburization (Heat Treatment) process, which hardens the surface for wear resistance while keeping the core flexible to absorb shock waves.
This rod features a standard Hex 22mm or 25mm shank, making it the perfect match for powerful pneumatic rock drills like YT28, YT29A, and ETS82. It is widely used in underground mining and tunneling where deep holes and high durability are required.
Step 1: Use H25 Rods + Q7 Bits to drill deep holes efficiently.
Step 2: Use Topking Expansive Mortar (HSCA) to split the rock block safely and reduce waste.
| Feature | H25 (Heavy Duty) | H22 (Standard) |
|---|---|---|
| Rigidity | Highest (Anti-bending) | Standard |
| Hole Straightness | Excellent for Deep Holes | Good for Short Holes |
| Energy Transfer | 95% Efficiency | 90% Efficiency |
Steel Grade: High Carbon Alloy Steel (Carburized 95CrMo)
Shank Size: Hex 25mm * 108mm / 159mm (Customizable)
Taper Degree: 7°, 11°, 12°
Available Lengths: 0.6m - 8.0m (Standard & Custom)
Process: Full-length Carburization for maximum fatigue life.
Application: Granite, Basalt, and Hard Ore Mining.
TAPERED DRILL ROD DIMENSIONS
Q: Why use H25 drill rods instead of H22 for deep holes?
A: H25 (Hex 25mm) has a larger cross-section, providing much higher stiffness. This effectively reduces bending vibration in holes deeper than 3 meters, resulting in straighter blastholes and protecting the drill bit from uneven wear.
Q: How does the Carburization process increase the rod life?
A: Our full-length carburizing heat treatment creates a carbon-rich hard shell on the steel. This layer resists external scratches and wear, while the inner core remains ductile to absorb the high-frequency impacts of 78J+ rock drills.
Q: Which rock drill models are best suited for H25 rods?
A: We highly recommend pairing H25 rods with high-power air-leg drills like YT28, YT29A, and ETS82. These machines generate enough energy to utilize the H25's superior transmission efficiency in hard granite mining.
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