Crossover Sub

Best Crossover Sub in China

The crossover sub is mainly used to connect upper and lower drill tools in different connectors in drilling operations. Also, it can be used to protect another tooling in drill stem (called saver sub) or be used to deliver outgoing air to the bit face just above the bit (called bit sub).


API Drilling Crossover Sub

DescriptionUpper Connection patLower Connection PartType
Kelly cross-over subKellyDrill pipeA or B
Drill pipe cross-over subDrill pipeDrill pipeA or B
Interim cross-over subDrill pipeDrill collarA or B
Drill collar cross-over subDrill collarDrill collarA or B
Drill bit cross-over subDrill collarDrill bitA or B
Swivel cross-over subSwivel lower subKellyC
Fishing cross-over subKellyDrill pipeC
Fishing cross-over subDrill pipeFishing toolsC

The crossover sub can be customized as per the customer’s design. A type is straight OD sub, B type is reduced section sub, C type is left hand.

Mechanical Properties

O.D. Range Min. Yield
 Min. Tensile
 Elongation Min. Min. Brinell
3.1/2 THRU
7 THRU 10 690Mpa930Mpa13%277

  1. The length of crossover subs is generally measured from shoulder to shoulder.
  2. Typical lengths range from 6″ – 28″ long going up in increments of 2 inches with AISI 4145H, AISI 4145H Mod, AISI 4340, AISI 4140-4142 and Non-magnetic material.
  3. All connections are phosphate-coated or copper plated to improve resistance to corrosion.
  4. Crossover subs come in three basic types: A Pin (male) * Box (female); B Pin (male) * Pin (male); C Box (female) * Box (female)

A crossover sub is used to crossover from one connection size to another or as the disposable component used to extend the connection life of a more expensive drill stem member.

What is the type of crossover sub?

According to requirements, it can be divided into drill pipe thread circulation joint, casing thread circulation joint and threaded circulation joint.
The upper part of the casing circulation joint is a drill pipe joint thread for connecting the drill pipe or connecting the pipe by a union joint.
The lower part is machined with an API sleeve with a trapezoidal thread (or API sleeve long round buckle/short round buckle) for coupling the sleeve coupling.

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