ROLLER KELLY BUSHINGS
Roller Kelly Bushings are used for 171/2-491/2 inch rotary tables. They are designed and manufactured according to API Spec 7K.
Model
type
Way of drive
Square(in)
Hex(in)
HDS
Heavy
Square drive
3-6
3-6
27-HDP
Pin drive
3-6
3-6
20-HDP
Pin drive
3-6
3-6
RTM4
Medium
Square drive
2.1/2-5.1/4
3-4.1/4
20-MDP
Pin drive
2.1/2-4.1/4
3-4.1/4
17-MDP
Pin drive
2.1/2-4.1/4
3-4.1/4
RTS4
Light-duty
Square drive
2.1/2-4.1/4
3-4.1/4
MASTER BUSHING ACCESSORIES
MASTER BUSHING ACCESSORIES
Bit Breaker Adapter Plates are located in the Master Bushing drive pin holes and provide a 139/16 inch square to accommodate Bit Breakers. They are used for MPCH, MSPC,MDSP and MSP.P/N:1816 use for 23-491/2 inch master bushing; P/N 1815 use for 171/2-21 inch master bushing.Lifting Sling for removing and installing bushings and insert bowlsWith 2 hooks P/N1021 for removing and installing insert bolwsWith 4 hooks P/N6699 for removing and installing bushingsBit breakers are mostly used for screwing standard 3-cone bit.
MASTER BUSHINGS:
MASTER BUSHINGS
Our company produce the master bushings and insert bowls with the size from 171/2 to 371/2 inch. They are cast with high-quality alloy steel and the sizes conform to API Spec 7K. There are two kinds of type. pin drive and square drive. API standard rotary slip, drill collar slip, casing slip or roller Kerlly bushing can be contained in them.
MASTER BUSHINGS-KELLY
BUSHINGS-MASTER BUSHING ACCESSORIES
ROLLER KELLY BUSHINGS 
