hexagonal kelly:3" 3-1/2" 4-1/4" 5-1/4"

Kellys are the drive section of the whole drill stem.

The manufacturing of the products refers to the standard of SY/T6509-2000. AISI4145H alloy steel is used in producing the kellys. Kellys’end, drive cross-section and joint are all processed and tested in terms of API...

 

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