Thread extension steel bars for rock drilling tools must own high fatigue strength, elasticity, rigidity and toughness, but strength and toughness is contradictory. The thread at both ends of the thread rods is a whole set of drilling tools, it's the key part of rod. It is well known that the performance of the material could be played well only after going through heat treatment to release its maximum potential, therefore, the choice of material and heat treatment process are important on an equal basis.
T38 10ft (3050mm) thread size single thread extension rod:
(1) Threaded Connection: R22, R25, R32, R38, T38, T45, T51, and so on.
(2) Diameter: OD32, OD38, HEX32, HEX35, And so on.
(3) Length: 600-6400mm.
(4) Package: Wooden cases or wrapped with plastic knitting and then packed into bundles or as per your requests.
Extension rod T38 - Hex. 32 mm - T38
Extension rod T38 - Round 39 mm - T38 (Speed rod)
Extension rod R38 - Round 39 mm - R38
Extension rod T38 - Round 39 mm - T38
Extenstion rod T38 - Round 39 mm - T38 (with double thread)