EN
NA Wireline Core Drill Rod with Upset Ends
NA series integral upset drill rod is universal high-strength drilling pipe for medium-shallow rock core drilling, engineering investigation and mine exploration. Adopting one-piece hot forging inner upset forming process and universal industrial technical description, it avoids patent naming and structural copy infringement risks of similar products. It is suitable for drilling operation within 1400m depth, widely used in geotechnical engineering survey, shallow metal ore sampling, hydrogeological drilling and underground tunnel coring.
Certificates: ISO, RoHS, MSDS
Material: ZT950
Available Lengths: 1m, 1.5m, 3m
Recommended Drilling Depth: 1400m
Description
NA series integral upset drill rod is universal high-strength drilling pipe for medium-shallow rock core drilling, engineering investigation and mine exploration. Adopting one-piece hot forging inner upset forming process and universal industrial technical description, it avoids patent naming and structural copy infringement risks of similar products. It is suitable for drilling operation within 1400m depth, widely used in geotechnical engineering survey, shallow metal ore sampling, hydrogeological drilling and underground tunnel coring.
| Basic rod specification: | Outer diameter 70mm, wall thickness 4.5mm |
| Upset section dimension: | Upset inner diameter 59.8mm, upset outer diameter 71.5mm |
| Recommended drilling depth: | Maximum recommended drilling depth 1400m |
| Main material: | ZT950 high-yield seamless steel pipe for drilling, with balanced mechanical properties, suitable for conventional load and alternating load working conditions of medium-shallow strata |
| Standard single rod length: | 1.5m / 2m / 3m, customized special lengths available on request |
Specifications
| Model | HA |
| Drill Rod Specification (mm) | 89*5mm |
| Thickened O.D/I.D (mm) | 77.5/ 90.5mm |
| PCS/ Bundle | 19pcs |
| Weight kg/ m | 10.5kg/m |
| Core diameter / Hole diameter | 63.6/ 95.5mm |
| Recommendation depth | 1500m |
Product features
1. Integrated Monolithic Upset Structure
The rod body and connecting end are integrally hot forged and upset without secondary welding. The upset end is locally thickened and reinforced with smooth wall thickness transition, eliminating common defects including stress concentration, weld cracking and desoldering of traditional welded drill rods. Smooth inner bore ensures unobstructed drilling fluid flow and lower assembly resistance of matched core barrels and drilling tools.
2. ZT950 High-grade Special Base Material
Made of quenched and tempered ZT950 alloy seamless steel with yield strength ≥950MPa. It has better torsion, compression, impact and fatigue resistance than conventional DZ series geological drill rods. It resists bending, distortion and fracture under 1400m medium-shallow drilling conditions, adapting to long-term stable operation in weathered rock, sandstone and ordinary hard rock strata.
3. Precise Tolerance & High Drilling Stability
CNC precise machining tolerance of upset section perfectly matches supporting locking threads, featuring tight joint fitting and superior sealing performance without high-pressure flushing fluid leakage and pressure relief. Optimized gradient wall thickness structure disperses alternating stress of rod body, guarantees stable torque transmission at rated 1400m depth, and reduces thread galling, wear and slipping faults effectively.
4. Flexible Selection of Multiple Lengths
1.5m short rods adapt to mine tunnels and confined construction sites; 2m and 3m standard long rods match surface medium and small-sized drilling rigs, reduce drill rod joint quantity, shorten assembly time, improve overall drilling efficiency and cut joint consumption and equipment maintenance cost.
