Drill String

Rotary Kelly

● The Square Kelly 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 of the Square Kelly, IDs and connections machined and inspected to API specifications; ● The Square Kelly Ultrasonic inspection is performed on all sections; ● The Square Kelly Shipped in a protective steel-cased scabbard;