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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

03900WNAN N/A 1/2 N/A 4.75 in N/A 0.88 in N/A 1.38 in N/A 2.38 in N/A 1.50 in N/A Specified by purchaser N/A 5 lb N/A 3.25 in N/A 4 N/A 0.88 in
04900WNAN N/A 3/4 N/A 5.13 in N/A 1.00 in N/A 1.69 in N/A 2.75 in N/A 1.75 in N/A Specified by purchaser N/A 6 lb N/A 3.50 in N/A 4 N/A 0.88 in
05900WNAN N/A 1 N/A 5.88 in N/A 1.13 in N/A 2.00 in N/A 2.88 in N/A 2.06 in N/A Specified by purchaser N/A 9 lb N/A 4.00 in N/A 4 N/A 1.00 in
06900WNAN N/A 1 1/4 N/A 6.25 in N/A 1.13 in N/A 2.50 in N/A 2.88 in N/A 2.50 in N/A Specified by purchaser N/A 10 lb N/A 4.38 in N/A 4 N/A 1.00 in
08900WNAN N/A 1 1/2 N/A 7.00 in N/A 1.25 in N/A 2.88 in N/A 3.25 in N/A 2.75 in N/A Specified by purchaser N/A 13 lb N/A 4.88 in N/A 4 N/A 1.13 in
10900WNAN N/A 2 N/A 8.50 in N/A 1.50 in N/A 3.63 in N/A 4.00 in N/A 4.13 in N/A Specified by purchaser N/A 25 lb N/A 6.50 in N/A 8 N/A 1.00 in
12900WNAN N/A 2 1/2 N/A 9.63 in N/A 1.63 in N/A 4.13 in N/A 4.06 in N/A 4.88 in N/A Specified by purchaser N/A 36 lb N/A 7.50 in N/A 8 N/A 1.13 in
14900WNAN N/A 3 N/A 9.50 in N/A 1.50 in N/A 5.00 in N/A 4.00 in N/A 5.00 in N/A Specified by purchaser N/A 31 lb N/A 7.50 in N/A 8 N/A 1.00 in
16900WNAN N/A 4 N/A 11.50 in N/A 1.75 in N/A 6.19 in N/A 4.50 in N/A 6.25 in N/A Specified by purchaser N/A 53 lb N/A 9.25 in N/A 8 N/A 1.25 in
18900WNAN N/A 5 N/A 13.75 in N/A 2.00 in N/A 7.31 in N/A 5.00 in N/A 7.50 in N/A Specified by purchaser N/A 86 lb N/A 11.00 in N/A 8 N/A 1.38 in
20900WNAN N/A 6 N/A 15.00 in N/A 2.19 in N/A 8.50 in N/A 5.50 in N/A 9.25 in N/A Specified by purchaser N/A 110 lb N/A 12.50 in N/A 12 N/A 1.25 in
24900WNAN N/A 8 N/A 18.50 in N/A 2.50 in N/A 10.63 in N/A 6.38 in N/A 11.75 in N/A Specified by purchaser N/A 175 lb N/A 15.50 in N/A 12 N/A 1.50 in
0H900WNAN N/A 10 N/A 21.50 in N/A 2.75 in N/A 12.75 in N/A 7.25 in N/A 14.50 in N/A Specified by purchaser N/A 260 lb N/A 18.50 in N/A 16 N/A 1.50 in
3Q900WNAN N/A 12 N/A 24.00 in N/A 3.13 in N/A 15.00 in N/A 7.88 in N/A 16.50 in N/A Specified by purchaser N/A 325 lb N/A 21.00 in N/A 20 N/A 1.50 in
01900WNAN N/A 14 N/A 25.25 in N/A 3.38 in N/A 16.25 in N/A 8.38 in N/A 17.75 in N/A Specified by purchaser N/A 400 lb N/A 22.00 in N/A 20 N/A 1.63 in
1Q900WNAN N/A 16 N/A 27.75 in N/A 3.50 in N/A 18.50 in N/A 8.50 in N/A 20.00 in N/A Specified by purchaser N/A 495 lb N/A 24.25 in N/A 20 N/A 1.75 in
1H900WNAN N/A 18 N/A 31.00 in N/A 4.00 in N/A 21.00 in N/A 9.00 in N/A 22.25 in N/A Specified by purchaser N/A 680 lb N/A 27.00 in N/A 20 N/A 2.00 in
02900WNAN N/A 20 N/A 33.75 in N/A 4.25 in N/A 23.00 in N/A 9.75 in N/A 24.50 in N/A Specified by purchaser N/A 830 lb N/A 29.50 in N/A 20 N/A 2.13 in
2H900WNAN N/A 24 N/A 41.00 in N/A 5.50 in N/A 27.25 in N/A 11.50 in N/A 29.50 in N/A Specified by purchaser N/A 1500 lb N/A 35.50 in N/A 20 N/A 2.63 in
Unit of Measure
1