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  • All dimensions are in inches.
  • These flanges will be furnished with a 1/4" raised face unless otherwise specified.
  • Flat face option available.

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ANSI B16.5 Class 400 Weld Neck Flange
Unit of Measure
1 

Item #

Nominal Pipe Size

Outside Diameter (O)

Thickness (T)

Raised Face Diameter (R)

Length Thru Hub (Y)

Hub Diameter (X)

Bore (B)

Approximate Weight

Bolt Circle (C)

Number of Holes

Diameter of Holes

04400WNAN N/A 1/2 N/A 3.75 in N/A 0.56 in N/A 1.38 in N/A 2.06 in N/A 1.50 in N/A Specified by purchaser N/A 2 lb N/A 2.63 in N/A 4 N/A 0.63 in
05400WNAN N/A 3/4 N/A 4.63 in N/A 0.63 in N/A 1.69 in N/A 2.25 in N/A 1.88 in N/A Specified by purchaser N/A 4 lb N/A 3.25 in N/A 4 N/A 0.75 in
06400WNAN N/A 1 N/A 4.88 in N/A 0.69 in N/A 2.00 in N/A 2.44 in N/A 2.13 in N/A Specified by purchaser N/A 4 lb N/A 3.50 in N/A 4 N/A 0.75 in
08400WNAN N/A 1 1/4 N/A 5.25 in N/A 0.81 in N/A 2.50 in N/A 2.63 in N/A 2.50 in N/A Specified by purchaser N/A 6 lb N/A 3.88 in N/A 4 N/A 0.75 in
10400WNAN N/A 1 1/2 N/A 6.13 in N/A 0.88 in N/A 2.88 in N/A 2.75 in N/A 2.75 in N/A Specified by purchaser N/A 8 lb N/A 4.50 in N/A 4 N/A 0.88 in
12400WNAN N/A 2 N/A 6.50 in N/A 1.00 in N/A 3.63 in N/A 2.88 in N/A 3.31 in N/A Specified by purchaser N/A 12 lb N/A 5.00 in N/A 8 N/A 0.75 in
14400WNAN N/A 2 1/2 N/A 7.50 in N/A 1.13 in N/A 4.13 in N/A 3.13 in N/A 3.94 in N/A Specified by purchaser N/A 18 lb N/A 5.88 in N/A 8 N/A 0.88 in
16400WNAN N/A 3 N/A 8.25 in N/A 1.25 in N/A 5.00 in N/A 3.25 in N/A 4.63 in N/A Specified by purchaser N/A 23 lb N/A 6.63 in N/A 8 N/A 0.88 in
18400WNAN N/A 3 1/2 N/A 9.00 in N/A 1.38 in N/A 5.50 in N/A 3.38 in N/A 5.25 in N/A Specified by purchaser N/A 26 lb N/A 7.25 in N/A 8 N/A 1.00 in
20400WNAN N/A 4 N/A 10.00 in N/A 1.38 in N/A 6.19 in N/A 3.50 in N/A 5.75 in N/A Specified by purchaser N/A 35 lb N/A 7.88 in N/A 8 N/A 1.00 in
22400WNAN N/A 5 N/A 11.00 in N/A 1.50 in N/A 7.31 in N/A 4.00 in N/A 7.00 in N/A Specified by purchaser N/A 43 lb N/A 9.25 in N/A 8 N/A 1.00 in
24400WNAN N/A 6 N/A 12.50 in N/A 1.63 in N/A 8.50 in N/A 4.06 in N/A 8.13 in N/A Specified by purchaser N/A 57 lb N/A 10.63 in N/A 12 N/A 1.00 in
0H400WNAN N/A 8 N/A 15.00 in N/A 1.88 in N/A 10.63 in N/A 4.63 in N/A 10.25 in N/A Specified by purchaser N/A 89 lb N/A 13.00 in N/A 12 N/A 1.13 in
3Q400WNAN N/A 10 N/A 17.50 in N/A 2.13 in N/A 12.75 in N/A 4.88 in N/A 12.63 in N/A Specified by purchaser N/A 125 lb N/A 15.25 in N/A 16 N/A 1.25 in
01400WNAN N/A 12 N/A 20.50 in N/A 2.25 in N/A 15.00 in N/A 5.38 in N/A 14.75 in N/A Specified by purchaser N/A 175 lb N/A 17.75 in N/A 16 N/A 1.38 in
1Q400WNAN N/A 14 N/A 23.00 in N/A 2.38 in N/A 16.25 in N/A 5.88 in N/A 16.75 in N/A Specified by purchaser N/A 230 lb N/A 20.25 in N/A 20 N/A 1.38 in
1H400WNAN N/A 16 N/A 25.50 in N/A 2.50 in N/A 18.50 in N/A 6.00 in N/A 19.00 in N/A Specified by purchaser N/A 295 lb N/A 22.50 in N/A 20 N/A 1.50 in
02400WNAN N/A 18 N/A 28.00 in N/A 2.63 in N/A 21.00 in N/A 6.50 in N/A 21.00 in N/A Specified by purchaser N/A 350 lb N/A 24.75 in N/A 24 N/A 1.50 in
2H400WNAN N/A 20 N/A 30.50 in N/A 2.75 in N/A 23.00 in N/A 6.63 in N/A 23.13 in N/A Specified by purchaser N/A 425 lb N/A 27.00 in N/A 24 N/A 1.63 in
03400WNAN N/A 22 N/A 33.00 in N/A 2.88 in N/A 25.25 in N/A 6.75 in N/A 25.25 in N/A Specified by purchaser N/A 505 lb N/A 29.25 in N/A 24 N/A 1.75 in
3H400WNAN N/A 24 N/A 36.00 in N/A 3.00 in N/A 27.25 in N/A 6.88 in N/A 27.63 in N/A Specified by purchaser N/A 620 lb N/A 32.00 in N/A 24 N/A 1.88 in
Unit of Measure
1