Casing & Tubing Coupling

  • API 5CT Certificate.
  • 100 % customer satisfaction for Quality and Reliability.
  • Superior Plating, Painting and Packaging Processes.
  • After machining all couplings undergo 100% thread inspection.
  • Colour Coding and Marking as per API Standard.
  • MTRs available for all coupling.


Casing & Tubing Coupling


Couplings are short lengths of pipe used to connect 2 joints of tubing or casing.

They come with painted colour codes on their external surface to indicate their grades.

Couplings are manufactured according to API 5CT and 5B specifications.

Techanical Specification

ubing Coupling
Pipe O.D. 1.900, 2-3/8, 2-7/8, 3-1/2, 4, 4-1/2 in
Grade J-55, C-75, L-80, N-80, C-95, P-110
Thread Connection EUE, NUE
Option Electro-zinc platedPhosphorization
Standard API 5CT, API 5B


Casing Coupling
Pipe O.D. 4-1/2, 5, 5-1/2, 6-5/8, 7, 7-5/8, 8-5/8, 9-5/8, 10-3/4, 11-3/4, 13-3/8, 16, 18-5/8, 20 in
Grade H-40, J-55, K-55, C-75, L-80, N-80, C-95, P-110, L80-13CR
Thread Connection BTC, STC, LTC
Option Electro-zinc platedPhosphorization
Standard API 5CT, API 5B


Coupling pipe grade identification by paint color
Grade Color Coding (Painted Outside)
H-40 Black
J-55 or K-55 Green
N-80 Red
M-65 or L-80 Red with one Brown Band
L-80 Type 9CR Red with two Yellow Bands
L-80 Type 13CR Red with one Yellow Band
C-90 Type 1 Purple
C-90 Type 2 Purple with one Yellow Band
T-95 Type 1 Silver
T-95 Type 2 Silver with one Yellow Band
C-95 Brown
P-110 White
Q-125 Type 1 Orange
Q-125 Type 2 Orange with one Yellow Band
Q-125 Type 3 Orange with one Green Band
Q-125 Type 4 Orange with one Brown Band


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