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Class 400

ANSI B16.5 Class 400 Forged Flange


Nom Pipe Size Flange O.D. Flange Thick Dia. of Raised Face Hub Dia. Length Thru Hub Min Thread Length Dia. Of Bore Dia. Hub at bevel Fillet Radius Depth of Socket Dia. Counter Bore Bolt Circle Dia. No Holes
WN SO TH SW LJ WN SW SO SW LJ   /  
O T R X Y1 Y2 Y3 H B1 B2 B3 A r D C Dia. Holes
1/2 3.75 0.56 1.38 1.50 2.06 0.88 0.88 0.62   0.88 0.90 0.84 0.12 0.38 0.93 2.62 4 - 0.62
3/4 4.62 0.62 1.69 1.88 2.25 1.00 1.00 0.62 1.09 1.11 1.05 0.12 0.44 1.14 3.25 4 - 0.75
1 4.88 0.69 2.00 2.12 2.44 1.06 1.06 0.69 1.36 1.38 1.32 0.12 0.50 1.41 3.50 4 - 0.75
1 1/4 5.25 0.81 2.50 2.50 2.62 1.12 1.12 0.81 1.70 1.72 1.66 0.19 0.56 1.75 3.88 4 - 0.75
1 1/2 6.12 0.88 2.88 2.75 2.75 1.25 1.25 0.88 1.95 1.97 1.90 0.25 0.62 2.00 4.50 4 - 0.88
2 6.50 1.00 3.62 3.31 2.88 1.44 1.44 1.12 2.44 2.46 2.38 0.31 0.69 2.50 5.00 8 - 0.75
2 1/2 7.50 1.12 4.12 3.94 3.12 1.62 1.62 1.25 2.94 2.97 2.88 0.31 0.75 3.00 5.88 8 - 0.88
3 8.25 1.25 5.00 4.62 3.25 1.81 1.81 1.38 3.57 3.60 3.50 0.38 0.81 3.63 6.62 8 - 0.88
3 1/2 9.00 1.38 5.50 5.25 3.38 1.94 1.94 1.56 4.07 4.10 4.00 0.38   4.13 7.25 8 - 1.00
4 10.00 1.38 6.19 5.75 3.50 2.00 2.00 1.44 4.57 4.60 4.50 0.44   4.63 7.88 8 - 1.00
5 11.00 1.50 7.31 7.00 4.00 2.12 2.12 1.69 5.66 5.69 5.56 0.44   5.69 9.25 8 - 1.00
6 12.50 1.62 8.50 8.12 4.06 2.25 2.25 1.81 6.72 6.75 6.63 0.50   6.75 10.62 12 - 1.00
8 15.00 1.88 10.62 10.25 4.62 2.69 2.69 2.00 8.72 8.75 8.63 0.50   8.75 13.00 12 - 1.13
10 17.50 2.12 12.75 12.62 4.88 2.88 4.00 2.19 10.88 10.92 10.75 0.50   10.88 15.25 16 - 1.25
12 20.50 2.25 15.00 14.75 5.38 3.12 4.25 2.38 12.88 12.92 12.75 0.50   12.94 17.75 16 - 1.38
14 23.00 2.38 16.25 16.75 5.88 3.31 4.62 2.50 14.14 14.18 14.00 0.50   14.19 20.25 20 - 1.38
16 25.50 2.50 18.50 19.00 6.00 3.69 5.00 2.69 16.16 16.19 16.00 0.50   16.19 22.50 20 - 1.50
18 28.00 2.62 21.00 21.00 6.50 3.88 5.38 2.75 18.18 18.20 18.00 0.50   18.19 24.75 24 - 1.50
20 30.50 2.75 23.00 23.12 6.62 4.00 5.75 2.88 20.20 20.25 20.00 0.50   20.19 27.00 24 - 1.62
22 33.00 2.88 25.25 25.25 6.75 4.25 6.00   22.22 22.25 22.00 0.50     29.25 24 - 1.75
24 36.00 3.00 27.25 27.62 6.88 4.50 6.25 3.25 24.25 24.25 24.00 0.50   24.19 32.00 24 - 1.88

1-
1/4 in. raised face is not included in dimensions T, Y1, and Y2.
2- This dimension is for"true" Lap Joint. Lap joint flanges can also be made to slip-on lengths
3- Flange dimensions and drilling are accordance with ANSI B16.5 steel flange standard.
4- Socket Weld type flanges conform to ANSI B16.5 for sizes 1/2" through 3". Larger sizes are not covered by B16,5, but can be manufactured upon request.
5- Flange dimensions and drilling for 22" size are interpolated dimensions given in MSS-SP-44
Dimensional Data
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