ROTARY KELLY

Straightness of the kelly is very crucial in the manufacturing process, thus straightness inspections are carried out before, during and after each machining operation. The flats are precision-milled to API specifications. All milling processes are performed on specially designed rigid Kelly mills to ensure tight tolerances and high quality drive sections. Each TIANHE Kelly is furnished with a pressed steel  thread protectors.

Features and Benefits

● Manufactured from AISI 4145H-modified, fully heat-treated alloy steel with a Brinell hardness range of 285-341BHN and a minimum average Charpy impact value of 40 ft-lbs;  

●Ends and drive sections, IDs and connections machined and inspected to API  specifications;  

● Ultrasonic inspection is performed on all sections;  

● Shipped in a protective steel-cased scabbard;  

When ordering please specify

● Kelly type (square or hexagonal); 

● Nominal size and overall length; 

● Upper and lower connections.