Drill Stem SubBack to Products

Drill Stem SubBack to Products

A sub is a special short length of threaded pipe used to connect drill pipes to drill collars, with a drill pipe connection on one end and a drill collar connection on the other.

When a bit sub is used to convert connectors of different types or sizes, it is called a crossover sub. The sub that connects the drill bit to the last drill collar is the bit sub.

Products are manufactured in accordance with API Spec 7 RP7G as applicable.

There is a wide range of subs available, including:

Straight Crossover Sub (Box/Pin, Box/Box, Pin/Pin)
Bottleneck (reduced section) Sub (Box/Pin, Box/Box, Pin/Box, Pin/Pin)
Crossover Sub with Float Bore (Box/Pin, Box/Box, Pin/Box)
Bit Sub with Float Bore (Box/Box)
Bit Sub without Float Bore (Box/Box)
Top Drive Saver Sub (Pin/Pin)
Kelly Saver Sub without rubber protector (Box/Pin)
Kelly Saver Sub with a stretched on rubber protector (Box/Pin)
Lift Sub (18 deg taper or square shoulder) (None/Pin, Box/Pin)
Lift Plug (None/Pin)

Straight subs: Used to connect drill stem members that have a similar OD.

Reduced-section sub: Used to connect drill stem members that have different diameters that warrant the cross-sectional change necessary to accommodate different connections.

Saver sub: Used to extend the life of the rotary kelly by taking the connection wear each time it is made up to a drill stem component.

Bit sub: Size availability ranges from 3 1/8” to 11” OD and 36” to 48” length.

Lift sub: A lift sub enables the safe, efficient handling of straight OD tubular—such as drill collars, shock tools, jars, directional equipment, and other tools—by using the drill pipe elevators.

Top drive sub: Top drive subs serve as the sacrificial element between the drill string and the top drive, reducing repair and maintenance costs.