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DTH DRILL RODS (API REG.)

Trimach’s DTH Drill Rods (API REG) are built for drillers who face demanding conditions — in foundation, mining, and geothermal projects where every meter counts. When the goal is to keep drilling, not repairing, precision-machined API REG threads, friction-welded joints, heat-treated high-grade steel, and optimized airflow keep the energy moving where it matters — straight to the bit. The result: steady penetration, fewer breakdowns, and tools that last.

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Key Advantages of Tri-Mach DTH Drill Rods API REG.

  • Top-tier materials – made from selected high-strength alloy steel.
  • High welding standards – friction-welded and CNC-machined for perfect alignment.
  • Available in all API REG joints – full range from 2-3/8″ to 8-5/8″.
  • Customizable wall thickness and joint types – tailored DTH drilling rods for specific torque, depth, and air pressure needs.

A DTH drill rod is the backbone of every down-the-hole drilling system. It connects your drill rig to the DTH hammer, transferring rotation, air pressure, and impact energy straight to the DTH bit — where the real work happens.

How a DTH Drill Rod Transfers Power — From Rig to Rock ?

DTH drill rods (also known as drill tubes or drill pipes) serve as the mechanism to transmit impact force and rotation torque to the DTH hammer and DTH bit, while providing passage for air flow. Tri-Mach supplies a full range of friction-welded DTH drill rods in standard sizes from 76mm to 273mm, and custom sizes up to 406mm, all available in various wall thicknesses.

In DTH drilling, the percussive DTH hammer is located behind the drill bit, inside the hammer, a piston powered by compressed air gives the drill bit its striking power, while the DTH hammer casing gives guidance to the drill bit; the drill string rotates while the drilling hammer continuously strikes down into the rock. The DTH drill rods transmit the necessary feed force and rotation to the DTH hammer and bit, as well as compressed air for the DTH hammer, more dth drill rods are added to the top of the drill string as the hole gets deeper. The fast hammer impact breaks hard rock into small particles, which are blown up by the air exhaust from the DTH hammer. A Trimach rod keeps the power line tight from the top drive to the rock.

In casing and DTH ring bit systems, these rods are what make it possible to drill clean, straight holes through overburden and into bedrock. Whether you’re advancing casing or working in hard formation, the rod’s job never changes — transfer every bit of energy efficiently, meter after meter.

Product range – Standard Technical Dimensions

Drill Pipes Specifications
Outer diameter (mm) Outer diameter (inch) Wall Thickness [mm] Connection Thread Length mm Wrench Flat
76 3″ 6,3 API REG. 2-3/8″ 500
76 3″ 6,3 API REG. 2-3/8″ 1 000
76 3″ 6,3 API REG. 2-3/8″ 3 000
76 3″ 6,3 API REG. 2-3/8″ 6 000
89 3.5″ 6,3 API REG. 2-3/8″ 500
89 3.5″ 6,3 API REG. 2-3/8″ 1 000
89 3.5″ 6,3 API REG. 2-3/8″ 3 000
89 3.5″ 6,3 API REG. 2-3/8″ 6 000
114 4.5″ 8 API REG. 3-1/2″ 500
114 4.5″ 8 API REG. 3-1/2″ 1 000
114 4.5″ 8 API REG. 3-1/2″ 3 000
114 4.5″ 8 API REG. 3-1/2″ 6 000
139 5.5″ 10 API REG. 4-1/2″ 500
139 5.5″ 10 API REG. 4-1/2″ 1 000
139 5.5″ 10 API REG. 4-1/2″ 3 000
139 5.5″ 10 API REG. 4-1/2″ 6 000
168 6.625″ 10 API REG. 4-1/2″ 500
168 6.625″ 10 API REG. 4-1/2″ 1 000
168 6.625″ 10 API REG. 4-1/2″ 3 000
168 6.625″ 10 API REG. 4-1/2″ 6 000
219 8.625″ 12,5 API REG. 6-5/8″ 500
219 8.625″ 12,5 API REG. 6-5/8″ 1 000
219 8.625″ 12,5 API REG. 6-5/8″ 3 000
219 8.625″ 12,5 API REG. 6-5/8″ 6 000
273 10.75″ 12,5 / 16 API REG. 8-5/8″ 500
273 10.75″ 12,5 / 16 API REG. 8-5/8″ 1 000
273 10.75″ 12,5 / 16 API REG. 8-5/8″ 3 000
273 10.75″ 12,5 / 16 API REG. 8-5/8″ 6 000

Customized DTH Drilling Rods — Tailored to Your Project

Every drilling site is different — ground formation, depth, and hammer setup all demand their own balance of strength, airflow, and torque. If you need a thicker wall for hard formations or lighter rods for faster handling Trimach offers DTH drilling rods customized for your exact needs. 

DTH Drilling Rods Customization
Specification Customization Option Purpose / Benefit
Wall Thickness 6 mm – 16 mm or project-specific Adjusts rigidity and lifetime based on torque load and depth.
Length 0.5 m – 6 m (custom up to 12 m) Matches rig height and transport needs.
Thread Type API REG, IF, BECO, or client-specific Ensures compatibility with any DTH hammer or adapter.
Material Grade High-strength alloy steel variants Optimized balance of weight, fatigue resistance, and cost.
Air Channel Design Customized internal bore diameter Improves airflow and hammer efficiency.
Heavy-Duty Versions Reinforced ends & welded sections Designed for high-torque foundation and mining work.

Applications of DTH Drill Rods – Site-Friendly Solutions

We understand that ease of use is crucial in the field. Our DTH-API REG. Drill Rods are designed with practical features that make them site-friendly and easy to handle. From simple connections to user-friendly designs, our API REG. drill rods are engineered to facilitate smooth and efficient operations on-site.

  • Geothermal and Water Well Drilling
  • Foundation & Piling Projects
  • Wind Turbine Foundations
  • Anchoring Applications
  • Mining & Quarrying Operations

Why Choose Tri-Mach DTH Drill Rods — The Number One Tool for Drillers

Superior Manufacturing, Materials and Quality Control

Trimach’s DTH drill rods (API REG) are the preferred choice for drillers who work in demanding, rocky, and northern conditions — where tools are pushed to their limits every day. Each rod is built from heat-treated, high-strength steel with precision welding and CNC-machined API REG threads to guarantee endurance, reliability, and toughness in the field. 

Optimized internal airflow and perfect thread alignment ensure smooth energy transfer from rig to rock — keeping penetration steady and minimizing downtime. Every rod is inspected, tested, and certified before delivery, so you can trust it to perform wherever the job takes you.

Our commitment to quality and performance makes Trimach’s DTH drill rods the number one tool for professional drillers.

Areas We Serve

We serve rig operators, site and project managers and drilling contractors across Finland, Sweden, Norway, Denmark, Switzerland, Germany, Austria, the United Kingdom, Italy, Iceland, Poland, Estonia, Latvia, and Lithuania, providing fast delivery, technical support, and customized DTH solutions for Northern and Central European ground conditions.

FAQ: DTH – DRILL RODS (API REG. THREAD JOINTS)

A great DTH drill rod must stay straight, strong, and reliable under extreme torque and impact. It needs to handle constant rotation, vibration, and pressure without losing thread integrity or energy transfer. Trimach rods are heat-treated, friction-welded, and precision-machined for exactly that.

Fast wear usually comes from low-quality steel, poor heat treatment, or inaccurate threads. In hard formations or high-torque conditions, these weaknesses show up fast. Trimach uses high-grade alloy steel and precision API REG machining to reduce wear and extend lifetime in real drilling conditions.

Yes — drill pipe is often used for large-diameter work because it’s built as a double-pipe system. Drill rod usually means a single-pipe design for smaller diameters. Still, in everyday language, many drillers use the terms interchangeably.

API REG thread rods are ideal for diameters up to 273 mm. Above that, HEX joints are easier to open and handle on site. API REG provides strong, sealed connections — but in larger diameters, torque and site conditions can make HEX a better fit.

We recommend API REG drill rods up to 273 mm and above, go with HEX joints to avoid joint seizing and ensure easier maintenance in field conditions.

Contact us — we’ll tell you exactly what measurements to take. With those, we can confirm the correct API REG joint and matching hammer setup.

For efficient transport and handling, we suggest rods under 12 meters. Most rigs operate best with 3–6 m rods, balancing stability, weight, and ease of use.

Trimach RodMate is your best solution for preventing thread seizing. This specially formulated thread lubricant is designed specifically for DTH drill rod connections. Always avoid over-torquing and ensure threads are clean before connection. Combined with Trimach’s precision-machined threads and superior surface finish, RodMate minimizes galling and ensures smooth make-up/break-out even after long drilling cycles.

Friction-welded joints with perfect alignment ensure full torque transfer without stress points. That’s what prevents cracks and weld failures in high-impact drilling.

Inside the rod, air channels are machined to reduce turbulence. Smooth airflow improves hammer impact efficiency and keeps power going directly to the bit — less energy wasted, faster penetration.

Yes. We can produce customized drilling rods for any project — wall thickness, thread type, length, or air channel design. Heavy-duty models are popular in mining and foundation drilling where extended lifetime is critical.

Yes, as long as they’re round and free from dents. Using existing casings can reduce cost and lead time. We can inspect and adapt them for new DTH drill pipes.

A strong, well-machined rod keeps energy flowing efficiently and prevents failures in the field. Less downtime means more meters drilled per shift — that’s the core value of every Trimach DTH drill rod.

Related Products

  • DTH Hammers 
  • DTH Button Bits 
  • DTH Ring Bit Systems
  • Casing Advancement System
  • DTH Adapters and Subs
  • Heavy-Duty Drill Rods (HEX Joint)
  • Large ID Ring Bit Systems
  • DTH Ring Bit Sets for Casing Advancement

Do you have any further questions? Please feel free to contact Matias!

Matias Niemeläinen

matias.niemelainen@trimach.fi
+358405892446

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Problems with DTH-DRILL PIPES? Not anymore. We got it covered.

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