Specifications

API 7K HDP Roller Kelly Bushings
* ApI 7K
* used for 17.1/2 to 49.1/2inch rotary tables

API 7K HDP Roller Kelly Bushings

 

Roller Kelly Bushings can be classed as two types based on different ways of drive, square drive and pin drive. Also they can be classed as three types based on different style, heavy, medium and light-duty. They are used for 17.1/2 to 49.1/2inch rotary tables. They are designed and manufactured according to API Spec 7K.

 

Model	Type	Drive way	applicable size of kelly(in)
			Square	Hex
HDS	Heavy duty	Square drive	21/2-6	3-6
27-HDP		Pin drive	21/2-6	3-6
20-HDP			21/2-6	3-6
RTM4	Medium duty	Square drive	21/2-51/4	3-41/4
RTS4	Light duty		21/2-41/4	3-41/4