hexagonal kelly

Specification 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...