P/F PIN DRIVE ROLLER KELLY BUSHING INTERCHANGEABLE WITH TYPE 27HDP HEAVY DUTY FOR 3 1/2", 5", 5 1/4", 6" HEXAGONAL KELLY REF : ALL MANUFACTURERS AS 27 HDP TYPE WITH API 7K MONOGRAM ROLLER ASSY. COMPLETE FOR 5-1/4" HEX
Roller Kelly bushing can be classified as two types based on different ways of drive, square drive and pin drive.
Also the can be classified as three types based on different styles, heavy, medium and light-duty. They are used for 17 1/2” to 49 1/2” rotary tables. They are designed and manufactured according to API spec 7k specification for drilling and well servicing equipment.