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Dimension of cast grooved end

To raise efficiency, many factories take the method of cast groove for small size grooved pipe fittings and couplings, normally below 8″ (DN200). It follows standard ISO 6182-12, and no related AWWA standard.
grooved pipe fittings
grooved pipe fittings

Cast groove as ISO 6182-12

Dimension of cast grooved end
Nominal size Outside diameter Gasket seat (A)
±0.76		 Groove width (B)
±1.17		 Groove diameter (C)
OD Tolerance (mm) Average Tolerance +0.00
Inch DN mm - + mm mm mm mm
1" 25 33.4 0.37 0.37 15.88 7.54 30.2 -0.89
1-1/4" 32 42.2 0.37 0.37 15.88 7.54 39.0 -0.89
1-1/2" 40 48.3 0.34 0.34 15.88 7.54 45.1 -0.89
2" 50 60.3 0.40 0.40 15.88 8.36 57.2 -0.89
2-1/2" 65 73.0 0.49 0.49 15.88 8.36 69.1 -0.97
2-1/2" 65 76.1 0.50 0.50 15.88 8.36 72.3 -0.97
3" 80 88.9 0.54 0.54 15.88 8.36 84.9 -0.97
4" 100 114.3 0.61 0.61 15.88 9.14 110.1 -1.07
5" 125 139.7 0.68 0.68 15.88 9.14 135.5 -1.07
5" 125 141.3 0.69 0.69 15.88 9.14 137.0 -1.07
6" 150 165.1 0.74 0.74 15.88 9.14 160.8 -1.07
6" 150 168.3 0.74 0.74 15.88 9.14 164.4 -1.07
8" 200 219.1 0.76 0.76 19.05 11.53 214.4 -1.52
10" 250 273.0 0.77 0.77 19.05 12.32 268.3 -1.57
12" 300 323.9 0.79 0.79 19.05 12.32 318.3 -1.65
Note:
1. OD: The outside diameter of cast grooved component.
2. Gasket seat (A): It is measured from the component end to groove, for gasket seating.
3. Groove width (B): It shall be free of scale, dirt, chips, and rust that may interfere with proper coupling assembly.
4. Groove diameter (C): It shall be uniform groove diameter for the entire component circumference.
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