H25 Hex tapered hollow drill rods , Tapered Rock Drill Steel Rod for rock drill YT24,YT27,YT28 etc
Tapered drill rod is a further development of the integral drill rods. It usually has a forged collar to maintain the proper shank striking face position in the rock drill. Tapered drill rods effective lengths are measured from the collar to the bit end,which are usually from 0.6 meters to 3.6 meters.
H25 Hex tapered hollow drill rods , Tapered Rock Drill Steel Rod for rock drill YT24,YT27,YT28,YT29A etc
Effective lengths: 400mm ~ 8000mm;
Taper degrees: 4°46’, 6°, 7°, 11°, 12°;
Shank sizes: Hex.19mm,Hex. 22mm, Hex.25mm;
Other lengths are available upon request.
1. The ordinary connection taper degree is 7º, 11º and 12º, other degrees like 4.8º, 6º and 9º are also available upon request;
2. The ordinary shank is Hex22 × 108mm, Hex25 × 159mm and other styles are also available if upon customers’ request;
3. The rod length must be specified in order;
4. In order to adapt to different rock conditions, the drill rod is selected by users.
A wide taper degree is normally used when drilling with high impact hydraulic rock drills in medium hard to hard and abrasive rock formations.
Generally, the lightduty rock drill uses 7 taper or smaller taper degree, the heavyduty rock drill mainly uses 12 taper degree.
The tapered drill rods have a tough life, transferring the percussion energy from rock drill to drilling bit and then into the rock. They’re also subjected to high bending stress, not to mention corrosive water in the flushing hole.
It is forbidden to keep working when the tapered drill rod is bended, otherwise the service life of the tapered drill rod would be decreased.
If the tapered drill rod was sheared, it can be restored by re-machining a new taper.
1. Excellent comprehensive mechanical properties
2. High connection strength and sealability
3. High fatigue strength and long fatigue life
4. Good flushing effect to ensure high drilling rate
5. Steel grade: 95CrMo equivalent to SANDBAR 61.
6. Shank size: hex.22mm×108mm, hex.22mm×159mm.
hex.22mm×80mm, hex.25mm×108mm. hex.25mm×159mm.
7. Taper: 6, 7, 11, 12 degree etc.
8. With highly and strength of resistance on the bending, welding fixed.
9. Highly efficiency on production and steady quality.
10 It’s able to keep the hole straight and with long use time.
| Types of drill rods | Specifications | Length(mm) | Shank | Weight (kg) |
| Tapered drill rods | Taper Angle: 4, 6, 7, 11, 12 degree | 400mm to 8000mm | Hex22mm*108mm Hex25mm*159mm Hex19mm*108mm | 1.7 - 24.9 |
| Integral drill steel | Bit diameter: 26mm, 28mm, 30mm, 32mm, 34mm, 36mm, 38mm, 40mm, 42mm | 400mm to 4800mm | 3 – 15.4 |
| Plug hole rods | Chisel bit diameter: 17mm, 20mm, 22mm | 150mm to 710mm | 0.6 - 2.9 |
Tapered Drill Rod-H22 & H25
In our after sales service system, We establish perfect control system strictly according to ISO-9000 series, in this system, technology date and problem solve solution and preventive measures will be provided in any maintain project, all the spare parts will be used in new OEM products with installation instructions, packing list, manufacturer's instruction, qualification and Warranty certificate.
We provide "one equipment & one case, endless service, namely the after sales service begin from the order confirmation, last for the working life of the equipment.
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Steel Tapered Rock Drill Rods , Durable H25 Hex Tapered Hollow Drill Rods Images
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