Air-lift Reverse Circulation Double-wall Drill Pipe with S135 Steel Grade and 42-140mm Specification for Coal Mine
High-quality double wall drill pipe specifically designed for coal mine applications.
- Steel grade: E75R780G105 S135
- Specification: 42-140mm
- Thread types: For Vermeer, Ditch witch, Drillto
- Custom manufacturing available to meet specific requirements
| Type | O.D. of Outer Tube (mm) | I.D. of Inner Tube (mm) | Outer Diameter of Joint (mm) | Type of Threads | Effective Length (m) |
|---|---|---|---|---|---|
| WB114/65 | 114 | 65 | 156 | 41F | 6 |
| WB127/76 | 127 | 76 | 162/168 | 41/21F | 6, 9.5 |
| DB127/76 | 127 | 76 | 184 | 51/2FH | 9.5 |
| WB140/88 | 139.7 | 88 | 184 | 51/2FH | 6, 9.5 |
| WB219/130 | 219 | 130 | 240 | Factory standard | 6, 9.5 |
| WK76/32 | 76 | 32 | 78 | 3" Remet | 3 |
| WK102/41 | 102 | 41 | 103 | 4" Remet | 3, 6 |
| WK114/52 | 114.3 | 52 | 116 | 4 1/2" Remet | 3, 6 |
| WK114/38 | 114.3 | 38 | 114.3 | 4 1/2" Metzke | 3, 6 |
| WK114/50 | 114.3 | 50 | 114.3 | 4 1/2" Remet | 3, 6 |
| WP50/20 | 50 | 20 | 50 | 1, 1.5 | |
| WP73/35 | 73 | 35 | 73 | 1, 1.5 | |
| WP89/40 | 89 | 40 | 89 | 1, 1.5 |
- Manufactured from high-quality alloy steel
- All drill rods undergo professional heat treatment
- Optimized structure for reliable performance and high efficiency
- Excellent concentricity and precision for extended service life
Our standard production time is approximately 20 days. For items in stock, we can ship within 3 days.
We perform rigorous quality inspections and performance tests on every drill rod prior to shipment to guarantee reliability and durability.
Yes, we welcome sample orders as an opportunity for you to evaluate our product quality before committing to larger quantities.
Yes, all our drill pipes and casings receive professional heat treatment to enhance their structural strength and operational performance.
Yes, each unit is coated with anti-rust paint or anti-corrosion oil prior to shipping. Galvanized options are available upon request.
Email: tina@baiweidrill.com.cn
Whatsapp/Wechat: +86 13507065529
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.