IS 11180 : 1985 : square and hexagonal kellys for direct rotary drilling
| UDC 622.243.5.053.7 | MED 21 |
|
| Reaffirmed 2017 |
Scope
Lays down the requirements for square and hexagonal kellys manufactured as a single piece used for transmitting the rotational movement from the rotary table to the drill stem.