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What is the R32 T38 T45 T51 Male-female MF Extension Rod?
Oct 31, 2018

For extension rod, there are two shapes, one is round type, and another one is hexagonal type. All extension rods are threaded and made by hollow drill steels.

This hollow hole are usually named flushing hole, used for transmitting water or air during drilling. Two ends threads can be used for connecting couplings, shanks, couplings or bits. Typically two ends of extension rods are male, while sometime one end is male and another one is female, then we call it M/F rod. We need couplings to connect extension rods , while for M/F rods, because one end is female, so couplings are not necessary.

Extension rod size:


length 3 4 6 8 10 12 feet

T38 (R38)–Round39-T38 (R38)

length 4 6 10 12 feet


length 10 12 14 20 feet

T51 -Round52-T51

length 12 14 20 feet

MF rod/speed rod size:

MF-rod R32-Round32-R32

length 3 4 5 6 10 12 14 feet

MF Rod T38-Round39-T38

length 4 5 6 10 12 14 feet

MF Rod T45-Round46-T45

length 5 6 10 12 14 20 feet

MF Rod T51-Round52-T51

length 6 12 14 20 feet

MF Rod ST58-Round60-ST58

length 12 14 20 feet

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