Extension Drill Steel for Long Hole Drilling

Extension drill Steel is for top hammer production drilling in mining, tunneling, Bench Drilling, drifting, long-hole drilling, construction. High strength chromium-molybdenum steel with high fatigue strength and excellent wear resistance...

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Two ends threads can be used for connecting couplings, shanks, couplings or bits. Typically two ends of extension rods are male-male(MM Rod), while sometime one end is male and another one is female (we call it M/F rod).


Thread Type:

For extension rods, there are R22, R25, R28, R32, R38, T38, T45, T51, ST58, GT60 threads, and different lengths of rods are available from 600mm to 6400mm.

Extension Rod

Extension Drill Steel is Widely used in drifting, tunneling, benching, and long hole drilling.


Carbon Steel Bar

Body Type

Round shape and  hexagonal type

Thread type

R25, R28, R32, R38, T38,T45,T51, ST58, GT60


Hex25, Hex28, Rd32,Rd38, Rd 39, Rd45, Rd46, Rd51, Rd 81


Thread extension Drill Steel and MF rod





 MM Round Rod

P.S.: RD means Round Type Drill Rod.


Male Thread and Female Tread

Thread Type 


MF Extension Drill Steel (Speed Rod)

Extension ROD-MF-1 

Carburization and Heat Treatment

All Our extension drill rods are fully carburized with an advanced Bench Drilling heat treatment, combinated with phosphorization.




Packing Picture


Key Words

Extension Drill Steel

MF / MM Rod

Drifter Rod ,

extension rod ,

threaded drill rod

Drill steel

Round drill rod

Extension Drilling Rod for Bench Drilling

Extension Drilling Rod for Long Hole Drilling Underground

Speed Rod



The information you may like to know before order:

1. Q:Methods of Payment:

   A: T/T (Telegraphic Transfer) or Western Union or L/C at sight

2. Q: How long is your delivery time?

   A: Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are    not in stock, it is according to quantity. 

3. Q: Shipping way

   A: Sample order: we suggest Courier express like DHL/UPS/TNT/FEDEX or by air

     Bulk order: we suggest by air or by sea.

4. Q: Quality Control

   A: We have our own experienced QC.

  There will be strict inspection and testing for every order before shipping out.

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