Extension rods

Extension rods

For extension of drill rods and drilling depths of more than 10 mtr.
When the length of a single drill rods is not long enough, an extension rod can be used. An extension rod is attached to a drill rod usually through a coupling. In this way, drilling is possible to great depths.


Features extension rods

The extension rods are made of high quality steel. Properties are a superior tolerance of any rod bending and the best protection against steel exhaustion. The parts of the rod which are under great pressure, namely the surface of the shank- and the thread ends are hardened. The flushing channel has a special anti-corrosion layer to prevent corrosion from within. These are features which minimize risk of breaking the extension rod and to guarantee the optimal lifetime.
Extension rods are round or hexagonal. Round rods consist of less steel and are therefore lighter and slightly cheaper. However, the most commonly used rods are hexagonal. These rods are more fixed and therefore the drilling results are often straight and the drilled material is better disposed.

Increasing the drilling, a longer life and lower costs per drilled meter. These are the advantages of the extension rods of Monark en Rockmore.


On this page you will find all our Extension rods and couplings. You can order them from Rocbo with different connections and lengths.
Excellent product quality, a large stock and reliable advice and service help you increase your productivity and provide cost-efficient solutions for your drilling projects. For more information you can always contact us on +31 (0)23 5256904 or email us: info@rocbo.nl.


  • Connection - R25xR25
  • Connection - R32xR32
  • Connection - R25xR28
  • Couplings

Connection - R25xR25

Koppelstangen

Product Name1Art. nr.WeightDelivery TimePrice
Extension rod - thread R25xR25 / 610 Extension rod - thread R25xR25 / 610

L. 610mm

914942 2.50On request €124.32
Extension rod - thread R25xR25 / 915 Extension rod - thread R25xR25 / 915

L. 915mm

914943 3.55 1 Work day €129.84
Extension rod - thread R25xR25 / 1220 Extension rod - thread R25xR25 / 1220

L. 1220mm

914944 4.50 1 Work day €134.39
Extension rod - thread R25xR25 / 2435 Extension rod - thread R25xR25 / 2435

L. 2435mm

914947 9.20On request €254.04
Extension rod - thread R25xR25 / 3050 Extension rod - thread R25xR25 / 3050

L. 3050mm

914950 11.60On request €214.62
Extension rod - thread R25xR25 / 5000 Extension rod - thread R25xR25 / 5000

L. 5000mm

917156 19.20On request €339.49
Extension rod - thread R25xR25 / 4500 Extension rod - thread R25xR25 / 4500

L. 4500mm

917155 19.20On request €321.48
Extension rod - thread R25xR25 / 1830 Extension rod - thread R25xR25 / 1830

L. 1830mm

914948 4.50 1 Work day €190.95

Connection - R32xR32

Koppelstangen

Product Name1Art. nr.WeightDelivery TimePrice
Extension rod - thread R32xR32 / 610 Extension rod - thread R32xR32 / 610

L. 610mm

917153 3.15On request €141.98
Extension rod - thread R32xR32 / 915 Extension rod - thread R32xR32 / 915

L. 915mm

917160 4.50On request €169.60
Extension rod - thread R32xR32 / 2475 Extension rod - thread R32xR32 / 2475

L. 2475mm

917162 15.30On request €364.63
Extension rod - thread R32xR32 / 3050 Extension rod - thread R32xR32 / 3050

L. 3050mm

917165 16.30On request €369.21
Extension rod - thread R32xR32 / 3660 Extension rod - thread R32xR32 / 3660

L. 3660mm

917166 20.10On request €406.37
Extension rod - thread R32xR32 / 1830 Extension rod - thread R32xR32 / 1830

L. 1830mm

917161 13.00 1 Work day €260.61
Extension rod - thread R32xR32 / 1220 Extension rod - thread R32xR32 / 1220

L. 1220mm, male-female

917164 5.50On request €265.02
Extension rod - thread R32xR32 / 1525 Extension rod - thread R32xR32 / 1525

L. 1525mm, male-female

917167 8.00On request €290.26
Extension rod - thread R32xR32 / 1830 Extension rod - thread R32xR32 / 1830

L. 1830mm, male-female

917169 13.00 1 Work day €394.01
Extension rod - thread R32xR32 / 1000 Extension rod - thread R32xR32 / 1000

L. 1000mm

917159 5.00On request €167.93

Connection - R25xR28

Koppelstangen

Product Name1Art. nr.WeightDelivery TimePrice
Extension rod with thread - R25xR28 / 2115 Extension rod with thread - R25xR28 / 2115

L. 2115mm

914941 9.00On request €190.52

Couplings

Koppelstangen

Product Name1Art. nr.WeightDelivery TimePrice
Coupling R25-R25 (1 Coupling R25-R25 (1")
Diam. 35 x L.150
913332 0.60 1 Work day €71.55
Coupling R32-R32 (1,25 Coupling R32-R32 (1,25")

with full bridge

913311 1.50 1 Work day €115.44
Coupling R32-R32 (1,25 Coupling R32-R32 (1,25")
Diam. 44 x L.150
913308 0.95 1 Work day €64.68