Kelly is a square or hexagonally shaped steel pipe connecting the swivel to the drill pipe that moves through the rotary table and transmits torque to the drill stem.

Customer Options:
1. Standard: API 7-1; SY/T 6509; or Non-Standards.
2. Type: Square Kelly; Hexagonal Kelly.
3. Steel Grade: AISI 4145 H.
4. Size: OD (3 1/2''---6'') * ID (1 3/4''---3 1/2'') * Length (40').
5. Cold Rolling of Thread Roots
6. Stress Relief Groove
7. Thread Surface Process: Phoscoating or Copperize Process  Treatment.
8. Cast Steel Thread Protector.
9. Delivery Condition: Forged Bar; Semi-Finished; Finished Kelly.