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Thread Standards from ½" to 12"
 

Class 150 Thread Length

Class 300 Thread Length
 
Pipe Size Thread Length (Inches)
150 300 600
1/2" .62 .62 .62
3/4" .62 .62 .62
1" .61 .69 .69
1 1/4" .81 .81 .81
1 1/2" .88 .88 .88
2" 1.00 1.12 1.12
2 1/2" 1.12 1.25 1.25
3" 1.19 1.25 1.38
3 1/2" 1.25 1.44 1.56
4" 1.31 1.44 1.62
5" 1.44 1.69 1.88
6" 1.56 1.81 2.00
8" 1.75 2.00 2.38
10" 1.94 2.19 2.56
12" 2.19 2.38 2.75
 
Weldbend Notes:
  1. Weldbend flanges are tapped with American National Standard taper pipe threads.  These threads have longer thread lengths in proportion to the flange thickness of elevated temperatures.
  2. The gauging notch of the plug gauge should come flush with a manufacturing tolerance + one turn.
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