API Couplings

The casing pipe coupling is a kind of oilfield drilling tool, which is mainly used for the connection of the oil pipe, and mainly solves the problem that the existing coupling easily generates fatigue fracture due to stress concentration.

The tubing coupling structure is: the tubing end is connected to the inner wall of the coupling by a taper thread, and the end of the coupling body and the oil pipe are connected by the same thread with the pitch flat thread. The utility model has the characteristics of alleviating the stress concentration of the root of the external thread of the single taper thread connection tubing, is not easy to produce fatigue fracture, and has good connection effect.

Main buckle type: NU, EU, TBG, UP-TBG special buckle, etc. We can process various specifications, various lengths and various material couplings according to customer’s request order drawings.

Category:

Description

API Coupling size and dimensions

 

EUE

 Coupling Size Coupling OD Std. Coupling Length
2-3/8” 3.063” 4.875”
2-7/8” 3.668” 5.500”
3-1/2” 4.500” 5.750”
4-1/2” 5.563” 6.500”

 NUE

 Coupling Size Coupling OD Std. Coupling Length
2-3/8” 2.875” 4.500”
2-7/8” 3.500” 5.500”
3-1/2” 4.250” 5.625”
4-1/2” 5.200” 6.500”

 BTC

 Coupling Size Coupling OD Std. Coupling Length
2-3/8” 2.875” 8.500”
2-7/8” 3.500” 8.500”
3-1/2” 4.250” 8.500”
4-1/2” 5.200” 9.500”