American Cap Company Seamless Coupling Products

American Cap Company, a division of PTR Group, manufactures two types of seamless coupling products including API – 5L and API – 5CT for the natural gas and oil industries. A seamless coupling is a very short length of pipe or tube with pipe threads at one or both ends that allows two pipes of equal or different sizes to be joined. These seamless couplings help to extend or cease pipe runs, change the pipe size, and repair a broken or leaking pipe. Seamless couplings are a quick method of connecting different pipe sections while maintaining the reliability of the pipes.

We offer semi-premium and premium seamless couplings. We can make any custom connections.

At American Cap Company, we offer the following customization options to indicate special material grades for couplings as well as applications.

  • Coupling Color
  • Stripes
  • Stenciling
  • Pin Marking
API – 5L Seamless Couplings
  • Used in the natural gas and oil industries
  • Covers seamless and welded steel-lined pipes
  • Carbon steel grades
  • Resistance to cracking forces
  • Inexpensive with long service life

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API – 5CT Seamless Couplings
  • Provides standards for casing and tubing for the natural gas and oil industries
  • Steel grades
  • Seamless fittings
  • Ranges in coupling sizes and dimensions

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API Coupling Inventory

API Grades

API GRADES
GRADE
TYPE
PSL1
PSL2
H40
—-
X
J55
—-
X
K55
—-
X
N80
1
X
N80
Q
X
R95
—-
X
C110
—-
X
C90
—-
X
L80
1
X
L80
13Cr
X
L80
9Cr
X
T95
—-
X
P110
—-
X
Q125
—-
X

Coupling Size Table

API CASING COUPLINGS
Casing Size OD
STC
LTC
BTC
EUE
1.9
X
2 3/8
X
2 7/8
X
3 1/2
X
4
X
4 1/2
X
X
X
X
5
X
X
X
5 1/2
X
X
X
6 5/8
X
X
X
7
X
X
X
7 5/8
X
X
X
8 5/8
X
X
X
9 5/8
X
X
X
10 3/4
X
X
X
11 3/4
X
X
X
13 3/8
X
X
X