Description
H25-R25(R32) Tapered Drilling Rods are engineered specifically for light-duty rock drilling applications in mining, quarrying, and tunneling. Manufactured from high-grade ZK22CrNi3Mo alloy steel, these rods offer an exceptional balance of fatigue strength and toughness.
Designed with a standard 7° taper and featuring either R25 or R32 thread connections, these hexagonal rods (25mm/1″) ensure efficient energy transmission from the rock drill to the bit, significantly reducing energy loss and extending the service life of your equipment.
Key Features
Premium Material: Crafted from ZK22CrNi3Mo, a specialized chromium-nickel-molybdenum alloy steel known for its high impact toughness and superior fatigue resistance.
Precision Taper: Features a standard 7° taper angle for a secure and stable connection with tapered drill bits.
Versatile Threading: Available in both R25 and R32 thread options to match various light-duty drilling requirements.
Optimized Energy Transfer: The 25mm (1″) hexagonal shank (H25) provides maximum rigidity and ensures the percussive energy is delivered directly to the rock face.
Anti-Corrosion Coating: Finished with a protective layer (as seen in the signature orange/yellow finish) to prevent rust during storage and transport.
Specifications
| Product Code | Length (L) mm | Length (L) ft/in | Hex Size (H) | Thread | Taper | Weight (kg) |
|---|---|---|---|---|---|---|
| 246-2510-5207 | 1000 | 3′ 3 3/8″ | 25mm (1″) | R25 | 7° | 3.7 |
| 246-2522-5407 | 2200 | 7′ 2 5/8″ | 25mm (1″) | R32 | 7° | 8.7 |
| 246-2526-5407 | 2600 | 8′ 6 3/8″ | 25mm (1″) | R25 | 7° | 10.1 |
| 246-2528-5407 | 2800 | 9′ 2 1/4″ | 25mm (1″) | R25 | 7° | 10.9 |
Applications
The H25-R25(R32) drilling rod is the ideal choice for:
Small Hole Drilling: Perfect for handheld rock drills in granite and marble quarries.
Mining: Used in underground mining for drifting and bolting.
Construction: Ideal for road construction, foundation reinforcement, and demolition projects.
Trenching: Efficient for light-duty rock excavation in utility installations.
Maintenance & Care
To maximize the lifespan of your ZK22CrNi3Mo drilling rods, follow these maintenance tips:
- Lubrication: Always apply high-quality thread grease to the R25/R32 threads before assembly.
- Avoid Overheating: Ensure proper flushing (water or air) to keep the rod cool and clear debris.
- Straightness Check: Regularly inspect the rod for bending; a bent rod will lead to premature failure and bit damage.
- Proper Storage: Store rods in a dry environment to prevent surface pitting and stress corrosion.
How to Choose the Right Taper Rod?
Selecting the correct rod depends on three factors:
Drilling Depth: Match the rod length ($L$) to your required hole depth. For deeper holes, ensure the rod weight is manageable for your handheld drill.
Bit Compatibility: Verify if your drill bits require an R25 or R32 thread connection.
Rock Hardness: The ZK22CrNi3Mo material is excellent for medium-to-hard rock. If you are drilling in extremely abrasive conditions, ensure your flushing pressure is optimized.
FAQ
"H25" refers to the hexagonal shank size of 25mm (1 inch), which defines the cross-sectional shape and dimension of the rod body. "R25" and "R32" indicate the two available thread connection standards at the rod end. R25 is suited for lighter drilling setups, while R32 handles slightly more demanding applications. When ordering, confirm which thread type matches your drill bits and equipment.
The 7-degree taper refers to the angle of the tapered end that connects to your drill bit. This is an industry-standard angle that ensures a secure, self-centering fit between the rod and the tapered button or chisel bit. A precise 7° taper minimizes wobble during percussion drilling, reduces energy loss at the connection point, and extends the working life of both the rod and the bit.
The decision comes down to your existing drill bits and drilling equipment. R25 threads are typically used in lighter handheld rock drills and pair with R25 tapered bits. R32 threads are slightly larger and used where higher percussive energy or heavier equipment is involved. Always match the rod thread to your bit thread — mismatching will cause connection damage and safety risks. If you are unsure, check the thread specification printed on your existing bits or contact us with your drill model for confirmation.
Four practices make the biggest difference in rod longevity. First, always apply high-quality thread grease to the R25 or R32 threads before connecting the bit — dry threading accelerates wear and galling. Second, use proper water or air flushing during drilling to keep the rod cool and prevent heat buildup that can alter the steel's mechanical properties. Third, periodically check the rod for straightness — even slight bending puts uneven stress on the rod and bit, leading to early failure. Fourth, store unused rods in a dry location away from moisture to avoid stress corrosion.
These rods are made from ZK22CrNi3Mo alloy steel — a chromium-nickel-molybdenum grade specifically selected for percussive drilling tools. This material delivers high impact toughness to withstand thousands of percussive blows per minute, superior fatigue resistance to prevent cracking under cyclic stress, and good overall durability in medium-to-hard rock conditions. It is one of the most commonly specified steels for professional-grade taper rods.