
Drill Pipe
Using quality drill pipe in your drill string is best for your drill rig and drilling performance.

Secoroc Tubes -- Part of a Productive Package
Though their importance is often underestimated, tubes play an important role in DTH drilling -- regardless of application, rock type, hole depth, or drill rig. The key features of a high quality DTH tube are durability, accuracy, and manageability.
Though their importance is often underestimated, tubes play an important role in DTH drilling -- regardless of application, rock type, hole depth, or drill rig. The key features of a high quality DTH tube are durability, accuracy, and manageability.
High Quality Tubing
Secoroc tubes are made from cold drawn tubing, providing a superior surface finish and tolerance compared to their hot-rolled counterparts. Our solution drastically reduces the risk of scaling -- the cause of so many premature hammer failures.
Secoroc tubes are made from cold drawn tubing, providing a superior surface finish and tolerance compared to their hot-rolled counterparts. Our solution drastically reduces the risk of scaling -- the cause of so many premature hammer failures.
No Weak Links
Traditionally the threads and the joint between the tube and the end-pieces are vulnerable. To combat the problem we've friction-welded the joints for maximum strength and heat-treated the end-pieces for optimum durability.
Traditionally the threads and the joint between the tube and the end-pieces are vulnerable. To combat the problem we've friction-welded the joints for maximum strength and heat-treated the end-pieces for optimum durability.
Never Losing the Thread
Heat-treating the threads ensures not only a long service life, but also simplifies joining and breaking -- thereby cutting cycle time. To meet varying demands, we provide a selection of API threads. For applications where foam injection are used, we recommend the IF thread. Naturally, we also offer a wide range of subs and crossovers -- all made of high quality steel and heat-treated in the same way as tube end-pieces.
Heat-treating the threads ensures not only a long service life, but also simplifies joining and breaking -- thereby cutting cycle time. To meet varying demands, we provide a selection of API threads. For applications where foam injection are used, we recommend the IF thread. Naturally, we also offer a wide range of subs and crossovers -- all made of high quality steel and heat-treated in the same way as tube end-pieces.

Pipes From 4-1/2" and Wall Thickness >0.346"
Hot Rolled Grade API J-55
Technical Spec:
Hot Rolled Grade API J-55
Technical Spec:
Tubing J-55 | Tool Joints, Adapters | ||
Tensile Strength (RM) min. | 75,000 PSI | Surface Hardness | 58-62 HRC |
Yield Strength (ReH) min. | 55,000 PSI | Depth | 0.080" |
Elongation (A5) min. | 15% | Core Hardness | 32-36 HRC (approx. 300 HB) |
Hot rolled tubing fits inside the API N-80 standard, but it has the following shortcomings:
- The hot rolled surface is rough and can release scaling from the inside, which can enter into the hammer and cause severe damage to internal components.
- A rough surface gives higher friction losses, resulting in a higher pressure drop in the drill string.
- Wide tolerance of the wall thickness +/- 10-12%.
- Straightness tolerance not assigned. Must be straightened after welding.
- Production problems due to wide tolerances.
Pipes From 2-3/4" to 4-1/2" and Wall Thickness >0.346"
Hot Rolled Grade API J-55
Technical Spec:
Hot Rolled Grade API J-55
Technical Spec:
Tubing N-80 | Tool Joints, Adapters | ||
Tensile Strength (RM) min. | 100,000 PSI | Surface Hardness | 58-62 HRC |
Yield Strength (ReH) min. | 80,000 PSI | Depth | 0.080" |
Elongation (A5) min. | 18% | Core Hardness | 32-36 HRC (approx. 300 HB) |
In order to improve the quality of DTH tubes we are now changing over to cold drawn tubing, and the features and benefits are as follows:
Feature | Hot Rolled Tubing | Cold Drawn Tubing |
Ovality | Included in the tolerance for the wall | Included in the tolerance for the wall |
Wall Thickness | +/- 10-12% | +/- 3-4% |
Straightness | N/A | 0.012"/ft |
Benefits in Short of Cold Drawn Tubing:
- Reliable wall thickness
- Less ovality, less risk of eccentric wear
- Better quality of the friction weld, less risk of concentricity of welding
- Better wear resistance due to increased hardness
- Reliable weights max 2-3% variance
- Less risk of damage to the tube from the straightening operation
- An overall weight reduction of our DTH tube assortment
- Still API N-80 standard for tubing
Friction Welding 2-3/4" to 5-1/2" ---- Over 5-1/2" Shrink Fit and Stick Welded

Friction Welding:
- Friction welding is a safe and efficient way to weld the end-pieces on to the tube material. The welding becomes stronger than the tube.
- Friction welding is a combination between friction and pressure.
- The end-pieces rotate with a speed of 480 RPM, and the pressure is between 1,015 PSI and 2,175 PSI depending on the tube diameter and wall thickness.

Friction Welded:
- Friction welding gives much stronger joints, compared with electrode welding, due to less risk of impure joints.


Rotary Head | The power unit that rotates the drill string. |
Spindle Adapter | Also called a "saver sub," threads into the rotary head and drill pipe, protects the threads of the rotary head, considered to be part of rotary head. |
Drill Pipe | Available in a variety of lengths, diameters, wall thicknesses, and thread configurations. |
Starter Pipe | Similar to the drill pipe, always the first pipe in the hole, usually shorter to compensate for the length of the DTH hammer, and with a greater wall thickness to withstand more abrasion as the hole is drilled. |
Sub Adapter | Usually a short adapter, threaded on both ends in a male/female, female/female, male/male configuration. May be used to increase or decrease the thread diameter or change the thread style as needed for a particular application. |
DHT Hammer/ DTH Bit | The percussive mechanism that drills the hole. Available in a wide range of diameters and styles depending on the application. |
Rotary (Tricone) Bit | May take the place of the DTH Hammer and Bit in applications where percussive drilling is not required. |
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