AWWA STANDARDS

DIMENSIONAL TOLERANCES

AWWA STANDARD

ANSI / AWWA C207

 

O Outside Diameter ±1/8″ ±3.2 mm
B Inside Diameter +1/16″, -0.0″ +1.6 mm, -0.0 mm
C Thickness 18″ and smaller

20″ and larger

+1.8″, -0.0″

+3/16″, -0.0″

+3.2 mm, -0.0 mm

+4.8 mm, -0.0 mm

Y Length thru Hub 8″ and smaller

20″ and larger

+1/8″, -1/32″

+3/16″, -1/16″

+3.2 mm, -0.79 mm

+4.8 mm, -1.6 mm

Drilling Bolt Circle Diameter

Bolt Hole Spacing

±1/16″

±1/32″

±1.6 mm

±079 mm

Facing All classes shall be flat faced.

 

AWWA STANDARD

AWWA C207 – Slip-on and Blind Flanges

Classes B,D and E

Nominal
Size
NPS
Outside
Diameter
of
Flange
Inside
Diameter
of
Flange
Thickness
of
Flange
Length
thru
Hub
Diameter Of Hub At Base Diameter
of
Bolt
Circle
Number of
Bolt Holes
Diameter
of
Bolt
Holes
Slip-On Blind Class B(1) Blind Class D(2) Blind Class E(3)
O B C C C C Y X
26 in. 34.25 26.19 1 1.75 28.5 31.75 24 1.38
mm 870 665.22 25.4 44.5 723.9 806.5 35.1
28 in. 36.5 28.19 1 1 75 30.5 34 28 1.38
mm 927.1 716.02 25.4 44 5 774.7 863.6 35.1
30 in. 38.75 30.19 1 1.53 2.003 2.875 1.75 32.5 36 28 1.38
mm 984.3 766.82 25.4 38.86 50.88 50.88 44.5 825.5 914.4 35.1
32 in. 41.75 32.19 1.12 1.75 34 75 38.5 28 1.62
mm 1060.5 817.62 28.4 44.5 882.7 977.9 41.1
34 in. 43.75 34.19 1.12 1.75 36.75 40.5 32 1.62
mm 1111.3 868.42 28.4 44.5 933.5 1028.7 41.1
36 in. 46 36.19 1.12 1.834 2.369 3.344 1 75 38 75 42.75 32 1.62
mm 1168.4 919.22 28.4 46.58 60.17 84.93 44 5 984.3 1085.9 41.1
38 in. 48.75 38.19 1.12 1.75 40.75 45.25 32 1.62
mm 1238.3 970.02 28.4 44.5 1035.1 1149.4 41.1
40 in. 50.75 40.19 1.12 1.75 43 43 36 1.62
mm 1289.1 1020.82 28.4 44.5 1092 2 1200.2 41.1
42 in. 53 42.19 1.25 2.084 2.725 3.789 1.75 45 49.5 36 1.62
mm 1346.2 1071.62 31.8 52.93 69.21 96.24 44.5 1143 1257.3 41.1
44 in. 55.25 44.19 1.25 2.25 47 51.75 40 1.62
mm 1403.4 1122.42 31.8 57.2 1193.8 1314.5 41.1
46 in. 57.25 46.19 1.25 2.25 49 53.75 40 1.62
mm 1454.2 1173.22 31.8 57.2 1244.6 1365.3 41.1
48 in. 59.5 48.19 1.375 2.341 3.067 4.246 2.5 51 56 44 1.62
mm 1511.3 1224.02 34.92 59.46 77.9 107.85 63.5 1295 4 1422.4 41.1
50 in. 61.75 50.19 1.375 2.5 53 58.25 44 1.88
mm 1568.5 1274.82 34.92 63.5 1346.2 1479.6 47.8
52 in. 64 52.19 1.375 2.5 55 60.5 44 1.88
mm 1625.6 1325 62 34.92 63.5 1397 0 1536.7 47.8
54 in. 66.25 54.19 1.375 2.634 3.431 4.776 2.5 57 62.75 44 1.88
mm 1682.8 1376.42 34.92 66.9 87.15 121.31 63.5 1447.8 1593.9 47.8
60 in. 73 60.19 1.5 2.892 3.774 5.236 2.75 63 69.25 52 1.88
mm 1854.2 1528.82 38.1 73.46 95.86 132.99 69.9 1600.2 1759 47.8
66 in. 80 66.19 1.5 3.139 4.132 5.674 2.75 69 76 52 1.88
mm 2032 1681.22 38.1 79.73 104.95 144.12 69.9 1752.6 1930.4 47.8
72 in. 86.5 72.19 1.5 3.399 4.476 6.137 2.75 75 82.5 60 1.88
mm 2197.1 1833.62 38.1 86.33 113.69 155.88 69.9 1905 2095.5 47.8

(1) Class B: 86 PSI

(2) Class D: 150 PSI

(3) Class E: 275 PSI