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Home > Tapered drill rod > 76mm 89mm 102mm 114mm 127mm 140mm Hex Extension Drill Stem Rod DTH Drill Pipe Rod For Mining Drill Rig Forged Drilling Tool
76mm 89mm 102mm 114mm 127mm 140mm Hex Extension Drill Stem Rod DTH Drill Pipe Rod For Mining Drill Rig Forged Drilling Tool
76mm 89mm 102mm 114mm 127mm 140mm Hex Extension Drill Stem Rod DTH Drill Pipe Rod For Mining Drill Rig Forged Drilling Tool
76mm 89mm 102mm 114mm 127mm 140mm Hex Extension Drill Stem Rod DTH Drill Pipe Rod For Mining Drill Rig Forged Drilling Tool
76mm 89mm 102mm 114mm 127mm 140mm Hex Extension Drill Stem Rod DTH Drill Pipe Rod For Mining Drill Rig Forged Drilling Tool
76mm 89mm 102mm 114mm 127mm 140mm Hex Extension Drill Stem Rod DTH Drill Pipe Rod For Mining Drill Rig Forged Drilling Tool
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76mm 89mm 102mm 114mm 127mm 140mm Hex Extension Drill Stem Rod DTH Drill Pipe Rod For Mining Drill Rig Forged Drilling Tool
76mm 89mm 102mm 114mm 127mm 140mm Hex Extension Drill Stem Rod DTH Drill Pipe Rod For Mining Drill Rig Forged Drilling Tool
76mm 89mm 102mm 114mm 127mm 140mm Hex Extension Drill Stem Rod DTH Drill Pipe Rod For Mining Drill Rig Forged Drilling Tool
76mm 89mm 102mm 114mm 127mm 140mm Hex Extension Drill Stem Rod DTH Drill Pipe Rod For Mining Drill Rig Forged Drilling Tool
76mm 89mm 102mm 114mm 127mm 140mm Hex Extension Drill Stem Rod DTH Drill Pipe Rod For Mining Drill Rig Forged Drilling Tool

76mm 89mm 102mm 114mm 127mm 140mm Hex Extension Drill Stem Rod DTH Drill Pipe Rod For Mining Drill Rig Forged Drilling Tool

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Product Description

Mine Drill Pipe Overview

Core Structural Features

The structural design of mine drill pipes focuses on the core requirements of "impact resistance, easy assembly and disassembly, and leakage prevention". The key structures include the pipe body, joint, connecting thread, and auxiliary protective components.

  • 1. Pipe Body Structure (Overall Shape) Most are seamless steel pipes with a circular cross-section. For some special working conditions (such as deep-hole drilling), "variable-diameter pipe bodies" (slightly thicker at both ends and uniform in the middle) are adopted to balance weight and strength. The length of the pipe body is designed according to mine operation scenarios, with common single lengths of 1.5m, 3m, and 6m. It can be connected through joints to form a "drill string" to meet the needs of different drilling depths (shallow holes ≤ 50m, deep holes ≥ 100m).
  • 2. Wall Thickness Design Determined by the drilling diameter and stress strength, the conventional wall thickness ranges from 5mm to 12mm. For example, the wall thickness of a Φ76mm mine drill pipe is 5-6.5mm, and that of a Φ114mm mine drill pipe is 8-9.5mm. The wall thickness must be uniform (deviation ≤ 0.5mm) to avoid stress concentration caused by uneven local thickness and prevent fracture.
  • 3. Surface Treatment The humid and dusty underground environment easily causes corrosion and wear of the pipe body. Generally, the surface of the pipe body is treated with hot-dip galvanizing (zinc layer thickness ≥ 80μm), phosphating (film thickness 5-10μm), or wear-resistant coating spraying (such as ceramic coating, alloy powder coating) to improve rust and wear resistance and extend the service life.
Drill Pipe Detailed Design

Technical Specifications

Drill Pipe Type (Extended Joint, No Bayonet Joint) Drill Pipe Diameter (mm) Drill Pipe Length (mm) Actual Wall Thickness (mm) Thread Type Joint Length Pipe Body Material
76*5 76 3000 5 API 2 3/8 REG G350*M280 DZ50
76*5 76 4000 5 API 2 3/8 REG G350*M280 DZ50
76*5 76 5000 5 API 2 3/8 REG G350*M280 DZ50
76*6.5 76 3000 6.5 API 2 3/8 REG G350*M280 DZ50
76*6.5 76 4000 6.5 API 2 3/8 REG G350*M280 DZ50
76*6.5 76 5000 6.5 API 2 3/8 REG G350*M280 DZ50
89*6.5 89 3000 6.5 2 3/8 REG, 2-7/8 REG, NC26 G350*M280 R780
89*6.5 89 4000 6.5 2 3/8 REG, 2-7/8 REG, NC26 G350*M280 R780
89*6.5 89 5000 6.5 2 3/8 REG, 2-7/8 REG, NC26 G350*M280 R780
89*6.5 89 6000 6.5 2 3/8 REG, 2-7/8 REG, NC26 G350*M280 R780
102*8.5 102 4000 8.5 2-7/8 REG, 3-1/2 REG, NC31 G400*M300 R780
102*8.5 102 5000 8.5 2-7/8 REG, 3-1/2 REG, NC31 G400*M300 R780
102*8.5 102 6000 8.5 2-7/8 REG, 3-1/2 REG, NC31 G400*M300 R780
114*8.5 114 4000 8.5 3-1/2 REG, NC35 G400*M300 G105
114*8.5 114 5000 8.5 3-1/2 REG, NC35 G400*M300 G105
114*8.5 114 6000 8.5 3-1/2 REG, NC35 G400*M300 G105
127*9 127 4000 9 3-1/2 REG, NC38 G400*M300 G105
127*9 127 5000 9 3-1/2 REG, NC38 G400*M300 G105
127*9 127 6000 9 3-1/2 REG, NC38 G400*M300 G105
140*9.5 140 4000 9.5 NC46 G400*M300 G105
140*9.5 140 5000 9.5 NC46 G400*M300 G105
140*9.5 140 6000 9.5 NC46 G400*M300 G105

Product Display

Drill Pipe Detail 1 Drill Pipe Detail 2 Drill Pipe Detail 3

Manufacturing Facility

Workshop Process 1 Workshop Process 2 Workshop Process 3 Workshop Process 4

Package

Drill Pipe Package

Frequently Asked Questions

Are you an exact manufacturer or a trading company?
We are both; we have our own manufacturing factory and also maintain long-term relationships with partner factories.
What is your minimum order quantity?
Our MOQ is 1 piece or 1 complete set. The price may depend on the total order quantity. Sample orders are highly welcome for testing our product quality.
Can you accept OEM & ODM service?
Yes, both OEM and ODM services are fully acceptable. Please share your requirements or design drawings with us. Our specialized R&D team is led by a material research and drawing design expert with 25 years of experience in drilling tools design, including designing industry-leading top hammer bits and DTH hammer bits.
How about your delivery time?
It depends on the order requirements. Generally, it takes about 15-25 days. If the products are in stock, delivery usually takes only 5-10 days.
Can I visit your factory before placing an order?
Absolutely. We welcome visits to our manufacturing facility. Please contact us to schedule your visit and coordinate details.
What materials and surface treatments are used for the drill pipes?
We use high-grade seamless steel materials such as DZ50, R780, and G105. For surface protection, hot-dip galvanizing (zinc layer ≥ 80μm), phosphating (5-10μm), or specialized wear-resistant coatings (ceramic/alloy powder) are applied to optimize rust and wear resistance.

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