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STANDARD SPECIFICATION FOR THREADED COUPLINGS STEEL BLACK OR ZINC COATED(GALVANIZED) WELDED OR SEAMLESS FOR USE IN STEEL PIPE JOINTS

1.Scope 



1.1 Thsi specification covers black or galvanized welded or seamless threaded steel couplings for use with steel pipe in NPS 1/8 to NPS 20 inclusive (Note 1). Coulings ordered under this specification are internded for the user outlined in the pipe specifications referencing this specification.

Note 1- The dimensionless designator NPS(nominal pipe size)has been substituted in this standard for such tradtional terms as nominal diameter, size, and nominal size. 

1.2 The values stated in inch-pound units are to be regarded as standard. The metric values may be approximate.  




TABLE 1 Chemical Requirements

  Composition, max %
  Phosphous Sulfur
All processes 0.14 0.35




TABLE 2 Coupling Thread Dimension-Straight-Tapped (NPSC) for Standard Weight Pipe 

NPS Threads/in. Outside
diameter, in.
W		 Coupling min 
length, in. NL		 Pitch diameter, in.
min max
1/8 27 0.563 3/4 0.370 0.377
1/4 18 0.719 1 1/8 0.486 0.497
3/8 18 0.875 1 1/8 0.622 0.632
1/2 14 1.063 1 1/2 0.772 0.785
3/4 14 1.313 1 9/16 0.982 0.996
1 11 1/2 1.576 1 15/16 1.231 1.247
1 1/4 11 1/2 1.900 2 1.575 1.592
1 1/2 11 1/2 2.200 2 1.814 1.831
2 11 1/2 2.750 2 1/16 2.288 2.304
Outside diameter tolerances: For sizes 1 1/2 in. and under +0.015 -0.031 in.
2 in. andover ±1%




TABLE 3 Coupling Thread Dimensions - Taper-Tapped (NPT) 
Non-Recessed for Standard-Weight Pipe 

NPS Threads/in. Outside
diameter, in.
W		 Coupling min 
length, in. NL		 Pitch diameter, in.(E1)
Handtight engagement
1/8 27 0.563 3/4 0.3736
1/4 18 0.719 1 1/8 0.4916
3/8 18 0.875 1 1/8 0.6270
1/2 14 1.063 1 1/2 0.7784
3/4 14 1.313 1 9/16 0.9889
1 11 1/2 1.576 1 15/16 1.2386
1 1/4 11 1/2 1.900 2 1.5834
1 1/2 11 1/2 2.200 2 1.8223
2 11 1/2 2.750 2 1/16 2.2963
2 1/2 8 3.250 3 1/16 2.7622
3 8 4.000 3 3/16 3.3885
3 1/2 8 4.625 3 5/16 3.8888
4 8 5.000 3 7/16 4.3871
5 8 6.296 3 11/16 5.4493
6 8 7.390 3 15/16 6.5060
Outside diameter tolerances: For 1 1/2 in. and under +0.015 -0.031 in.
2 in. andover ±1%




TABLE 4 Coupling Thread Dimensions - Taper-tapped(NPT) 
Recessed for Extra-Strong and Double-Extra-Strong Pipe
(Dimensions conform to Line Pipe Couplings in accordance with API 5L)A 

NPS Threads/in. Outside
diameter, in.
W		 Coupling min 
length, in. NL		 Pitch diameter, in.(E1)
Handtight engagement
1/8 27 0.563 1 1/6 0.3736
1/4 18 0.719 1 5/8 0.4916
3/8 18 0.875 1 5/8 0.6270
1/2 14 1.063 2 1/8 0.7784
3/4 14 1.313 2 1/8 0.9889
1 11 1/2 1.576 2 5/8 1.2386
1 1/4 11 1/2 1.900 2 3/4 1.5834
1 1/2 11 1/2 2.200 2 3/4 1.8223
2 11 1/2 2.750 2 7/8 2.2963
2 1/2 8 3.250 4 1/8 2.7622
3 8 4.000 4 1/4 3.3885
3 1/2 8 4.625 4 3/8 3.8888
4 8 5.000 4 1/2 4.3871
5 8 6.296 4 5/8 5.4493
6 8 7.390 4 7/8 6.5060
8 8 9.625 5 1/4 8.5000
10 8 11.750 5 3/4 10.6209
12 8 14.000 6 1/8 12.6178
14 8 15.000 6 3/8 13.8726
16 8 17.000 6 3/4 15.8758
18 8 19.000 7 1/8 17.8750
20 8 21.000 7 5/8 19.8703
Outside diameter tolerances: For 1 1/2 in. and under +0.015 -0.031 in.
2 in. andover ±1%
Stand off tolerances:    

  

 

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