Description
RockHound H19x108mm Integral Drill Rod with Plug Drill bit is the industry standard for high-efficiency stone quarrying and secondary rock splitting. Unlike tapered or threaded tools, the integral design fuses the drill shank and the carbide head into a single, robust unit, ensuring maximum impact energy transfer from the rock drill to the rock face.
Forged from premium ZK22CrNi3Mo chromium-nickel-molybdenum alloy steel, these rods offer exceptional fatigue strength and impact toughness. This specialized material ensures that the rod can withstand high-frequency percussion without shank failure or premature wear, even in hard rock formations like granite and basalt.
Key Features
Premium ZK22CrNi3Mo Steel: Provides superior resistance to bending and breakage under extreme stress.
Integrated Plug Drill Bit: The chisel-type head is permanently fixed, eliminating energy loss at joints and increasing drilling speed.
Industry Standard Shank: Precision-machined H19 x 108mm hex shank fits perfectly into pneumatic hand-held drills (e.g., Y19A), reducing chuck wear.
High-Grade Tungsten Carbide: Features wear-resistant carbide inserts that maintain sharpness and ensure consistent hole diameters.
Optimized Energy Transfer: The streamlined body design allows for better flushing and faster penetration rates.
Technical Specifications
| Product Code | Shank Size | Total Length (L) | Effective Length (TL) | Bit Diameter (D) | Weight |
|---|---|---|---|---|---|
| 221-2026-9820 | H19 x 108mm | 260mm (10 1/4″) | 200mm (7 7/8″) | 20mm (25/32″) | 0.8 kg |
| 221-2026-9822 | H19 x 108mm | 260mm (10 1/4″) | 200mm (7 7/8″) | 22mm (7/8″) | 0.8 kg |
| 221-2531-9822 | H19 x 108mm | 310mm (12 1/4″) | 250mm (9 7/8″) | 22mm (7/8″) | 0.8 kg |
| 221-2834-9822 | H19 x 108mm | 340mm (13 3/8″) | 280mm (11″) | 22mm (7/8″) | 0.9 kg |
Applications
The H19 Integral Rod is a versatile tool for precision drilling:
Stone Quarrying: Ideal for “Plug and Feather” hole drilling in marble and granite.
Block Splitting: Used in the dimensional stone industry for secondary breaking.
Construction: Perfect for drilling anchor holes and foundation bolting in masonry.
Mining: Suitable for small-hole drilling and site preparation in underground mining.
Maintenance Guide
Regrinding: Monitor the carbide bit; regrind the chisel edge when the wear flat exceeds 2mm to prevent excessive stress on the rod.
Proper Collaring: Start drilling at a lower frequency to ensure the bit is seated correctly before applying full throttle.
Lubrication: Ensure your pneumatic air line oiler is filled to prevent friction damage to the shank.
Cooling Protocol: If the rod becomes excessively hot, allow it to air-cool. Do not quench in water, as this can cause micro-cracking in the ZK22CrNi3Mo steel.
How to Choose
Check Your Shank: Verify your rock drill requires a Hex 19mm (3/4″) shank; using the wrong size will damage both the tool and the machine.
Select Diameter (D): Choose the bit diameter (20mm or 22mm) based on the size of the wedges or chemical splitting agents you intend to use.
Determine Depth: Match the Effective Length (TL) to your required drilling depth—ranging from 200mm for shallow holes up to 280mm for deeper splitting.
- Material Quality: For heavy-duty professional use, always specify ZK22CrNi3Mo over standard carbon steel to maximize ROI through tool longevity.
Why Upgrade to ZK22CrNi3Mo?
Reduced Downtime: The addition of Nickel (Ni) and Chromium (Cr) significantly improves the alloy’s ability to absorb high-frequency vibrations from the pneumatic drill without developing micro-cracks.
Cost Efficiency: Although the initial cost is higher, the lower “cost-per-meter” drilled makes ZK22CrNi3Mo the more profitable choice for long-term projects.
Safety: Higher structural integrity means fewer incidents of the rod snapping inside the hole, which can be dangerous and difficult to extract.
Material Comparison: ZK22CrNi3Mo vs. 55SiMnMo
To help you make the best choice for your drilling operations, it is important to understand the metallurgy behind the tools. While 55SiMnMo is a common industry standard, ZK22CrNi3Mo is a high-tier alloy specifically engineered for extreme durability.
| Feature | Standard 55SiMnMo | Premium ZK22CrNi3Mo |
|---|---|---|
| Alloy Composition | Silicon-Manganese-Molybdenum | Chromium-Nickel-Molybdenum |
| Fatigue Life | Standard | Up to 30-50% Higher |
| Toughness | Moderate; prone to brittle fracture | High Impact Toughness (Prevents snapping / sudden failure) |
| Heat Treatment | Induction Hardening | Full Carburizing (Hard surface + flexible / tough core) |
| Best For | Soft to medium rock; budget-conscious / small-scale projects | Hard, abrasive rock; professional quarrying & high-duty drilling |
FAQ
RockHound integral rods feature a standard H19 x 108mm (3/4" x 4 1/4") hex shank. This is the industry-standard fitment for light-duty, hand-held pneumatic drills such as the Y19A, Y20, and Y24 series. Please verify your drill's chuck size before ordering.
Total Length (L): Refers to the entire length of the rod from the top of the shank to the tip of the bit. For example, our 260mm model has a total length of approximately 10 1/4 inches.
Effective Length (TL): This is the actual drilling depth capacity, measured from the collar to the tip. A 260mm rod typically provides an effective drilling depth (TL) of 200mm.
The 20mm (25/32") diameter is ideal for smaller splitting wedges and specialized plug work.
The 22mm (7/8") diameter is the most common choice for standard "Plug and Feather" sets used in granite and marble quarrying.
Using a 22mm bit ensures easier insertion of splitting tools and better clearance for debris flushing.
While actual performance depends on rock hardness (Protodyakonov scale), ZK22CrNi3Mo alloy steel typically offers a 30% to 50% increase in service life compared to standard carbon steel rods due to its superior fatigue resistance and chromium-nickel-molybdenum composition.