Product Description
RockHound H22x108mm 7 Degree Drill Taper Rod is engineered for high-intensity rock drilling applications. Designed with a standard H22 hexagonal shank (7/8″) and a precise 7° taper angle, this rod ensures a secure connection and optimal energy transfer to the drill bit.
The core advantage lies in its material: ZK22CrNi3Mo High-Alloy Steel. This premium material provides the perfect balance of hardness and toughness, significantly reducing the risk of breakage and extending the service life even in the hardest rock formations. Whether you are using hand-held jackhammers or pneumatic rock drills, our taper drill rods deliver the reliability you need.
Key Features
Premium ZK22CrNi3Mo Material: Advanced alloy steel ensures high impact toughness and excellent fatigue resistance.
Precision 7° Taper: Specifically designed for a tight fit with 7-degree tapered button or chisel bits, preventing detachment during operation.
Optimized Shank Design: Standard H22mm x 108mm shank compatible with most pneumatic and hydraulic rock drills.
Full Range of Lengths: Available from 500mm (1’5/8″) up to 8000mm (26’3″) to suit various drilling depths.
Anti-Corrosion Finish: Treated to withstand harsh underground and outdoor environments.
Technical Specifications
| 22mm (7/8″) Taper Rod – H22×108mm Shank, 7° Taper | ||||||
|---|---|---|---|---|---|---|
| Length (mm) | Length (ft/in) | Shank | Taper Angle | Product Code | Weight (kg) | |
| 500 | 1′ 5/8″ | H22×108mm | 7° | 236-2205-8197 | 1.5 | |
| 800 | 2′ 7 1/2″ | H22×108mm | 7° | 236-2208-8197 | 2.4 | |
| 1000 | 3′ 3 3/8″ | H22×108mm | 7° | 236-2210-8197 | 3.0 | |
| 1200 | 3′ 11 1/4″ | H22×108mm | 7° | 236-2212-8197 | 3.6 | |
| 1500 | 4′ 11 1/8″ | H22×108mm | 7° | 236-2215-8197 | 4.5 | |
| 1800 | 5′ 10 7/8″ | H22×108mm | 7° | 236-2218-8197 | 5.5 | |
| 2000 | 6′ 6 3/4″ | H22×108mm | 7° | 236-2220-8197 | 6.1 | |
| 2200 | 7′ 2 5/8″ | H22×108mm | 7° | 236-2222-8197 | 6.7 | |
| 2500 | 8′ 2 3/8″ | H22×108mm | 7° | 236-2225-8197 | 7.6 | |
| 3000 | 9′ 10 1/8″ | H22×108mm | 7° | 236-2230-8197 | 9.1 | |
| 3500 | 11′ 5 3/4″ | H22×108mm | 7° | 236-2235-8197 | 10.6 | |
| 4000 | 13′ 1 1/2″ | H22×108mm | 7° | 236-2240-8197 | 12.1 | |
| 4500 | 14′ 9 1/8″ | H22×108mm | 7° | 236-2245-8197 | 13.6 | |
| 5000 | 16′ 4 5/8″ | H22×108mm | 7° | 236-2250-8197 | 15.1 | |
| 6000 | 19′ 8 1/4″ | H22×108mm | 7° | 236-2260-8197 | 18.2 | |
| 7000 | 22′ 11 5/8″ | H22×108mm | 7° | 236-2270-8197 | 21.2 | |
| 8000 | 26′ 3″ | H22×108mm | 7° | 236-2280-8197 | 24.2 | |
Applications
This 7-degree tapered drill steel is the preferred choice for:
Mining: Underground mining and surface blast hole drilling.
Quarrying: Granite, marble, and limestone extraction.
Construction: Road building, foundation work, and trenching.
Tunneling: Efficient rock breaking and bolt hole drilling in tunneling projects.
Maintenance Tips
Check Taper Surface: Before use, ensure the taper end is clean and free of burrs to maintain a perfect fit with the drill bit.
Lubrication: Regularly lubricate the shank end (H22x108mm) to reduce friction and wear inside the drill chuck.
Proper Storage: Store rods in a dry environment and avoid stacking them directly on the ground to prevent rusting.
Monitor Straightness: Periodically check for rod bending; using a bent rod will increase vibration and shorten the life of both the rod and the drill.
How to Choose the Right Taper Rod?
1.Confirm Your Shank: Ensure your rock drill requires an H22 x 108mm shank. This is the industry standard for most medium-duty handheld drills.
2.Match the Taper Angle: This rod has a 7° taper. You must use it with a 7° tapered drill bit. (Using a 11° or 12° bit will cause immediate failure).
3.Select the Length (L): Start with a shorter rod (e.g., 800mm) for a starter hole, then progress to longer rods (e.g., 1800mm or 2500mm) as the hole deepens.
4.Rock Hardness: For extremely hard rock, the ZK22CrNi3Mo material is essential due to its high alloy content compared to standard carbon steel.
FAQ
ZK22CrNi3Mo is a high-grade alloy steel specifically designed for rock drilling. Unlike standard carbon steel, it contains Nickel (Ni) and Molybdenum (Mo), which provide superior impact toughness and fatigue strength. This means the rod is much less likely to snap under high-frequency impact, especially when drilling in hard or abrasive rock formations.
No. It is critical to match the taper angle of the rod with the taper angle of the bit. Using a 7° rod with an 11° or 12° bit will result in a poor fit, causing energy loss, reduced drilling speed, and likely leading to the bit getting stuck or the taper end breaking. Always ensure both are 7-degree.
You should start drilling with a shorter "starter rod" (e.g., 600mm or 800mm) to ensure better control and accuracy. As the hole deepens, you switch to progressively longer rods (e.g., 1600mm, then 2400mm). For deep-hole drilling in quarries, we offer lengths up to 8000mm (26'3").
Ensure the taper surfaces of both the rod and the bit are clean, dry, and free of grease. Before starting the drill, firmly tap the bit onto the rod. During operation, the impact force of the drill will naturally tighten the connection. If the bit keeps falling off, check for wear on the 7° taper end; it may need replacing.
Yes. While our 7-degree H22x108mm series is the most popular, we also manufacture rods with 11° and 12° tapers, as well as different shank sizes like H19 or H25. If you need a specific length not listed in our standard table (from 500mm to 8000mm), please contact our support team for a custom quote.