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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 Threaded Flanges
Unit of Measure
1 

Item #

Nominal Pipe Size

Outside Diameter (O)

Thickness (T)

Raised Face Diameter (R)

Length Thru Hub (Y)

Hub Diameter (X)

Approximate Weight

Bolt Circle (C)

Number of Holes

Diameter of Holes

0H400THAN N/A 1/2 N/A 3.75 in N/A 0.56 in N/A 1.38 in N/A 0.88 in N/A 1.50 in N/A 2 lb N/A 2.63 in N/A 4 N/A 0.63 in
3Q400THAN N/A 3/4 N/A 4.63 in N/A 0.63 in N/A 1.69 in N/A 1.00 in N/A 1.88 in N/A 3 lb N/A 3.25 in N/A 4 N/A 0.75 in
01400THAN N/A 1 N/A 4.88 in N/A 0.69 in N/A 2.00 in N/A 1.06 in N/A 2.13 in N/A 4 lb N/A 3.50 in N/A 4 N/A 0.75 in
1Q400THAN N/A 1 1/4 N/A 5.25 in N/A 0.81 in N/A 2.50 in N/A 1.13 in N/A 2.50 in N/A 5 lb N/A 3.88 in N/A 4 N/A 0.75 in
1H400THAN N/A 1 1/2 N/A 6.13 in N/A 0.88 in N/A 2.88 in N/A 1.25 in N/A 2.75 in N/A 7 lb N/A 4.50 in N/A 4 N/A 0.88 in
02400THAN N/A 2 N/A 6.50 in N/A 1.00 in N/A 3.63 in N/A 1.44 in N/A 3.31 in N/A 9 lb N/A 5.00 in N/A 8 N/A 0.75 in
2H400THAN N/A 2 1/2 N/A 7.50 in N/A 1.13 in N/A 4.13 in N/A 1.63 in N/A 3.94 in N/A 13 lb N/A 5.88 in N/A 8 N/A 0.88 in
03400THAN N/A 3 N/A 8.25 in N/A 1.25 in N/A 5.00 in N/A 1.81 in N/A 4.63 in N/A 16 lb N/A 6.63 in N/A 8 N/A 0.88 in
3H400THAN N/A 3 1/2 N/A 9.00 in N/A 1.38 in N/A 5.50 in N/A 1.94 in N/A 5.25 in N/A 21 lb N/A 7.25 in N/A 8 N/A 1.00 in
04400THAN N/A 4 N/A 10.00 in N/A 1.38 in N/A 6.19 in N/A 2.00 in N/A 5.75 in N/A 26 lb N/A 7.88 in N/A 8 N/A 1.00 in
05400THAN N/A 5 N/A 11.00 in N/A 1.50 in N/A 7.31 in N/A 2.13 in N/A 7.00 in N/A 31 lb N/A 9.25 in N/A 8 N/A 1.00 in
06400THAN N/A 6 N/A 12.50 in N/A 1.63 in N/A 8.50 in N/A 2.25 in N/A 8.13 in N/A 44 lb N/A 10.63 in N/A 12 N/A 1.00 in
08400THAN N/A 8 N/A 15.00 in N/A 1.88 in N/A 10.63 in N/A 2.69 in N/A 10.25 in N/A 67 lb N/A 13.00 in N/A 12 N/A 1.13 in
10400THAN N/A 10 N/A 17.50 in N/A 2.13 in N/A 12.75 in N/A 2.88 in N/A 12.63 in N/A 91 lb N/A 15.25 in N/A 16 N/A 1.25 in
12400THAN N/A 12 N/A 20.50 in N/A 2.25 in N/A 15.00 in N/A 3.13 in N/A 14.75 in N/A 130 lb N/A 17.75 in N/A 16 N/A 1.38 in
14400THAN N/A 14 N/A 23.00 in N/A 2.38 in N/A 16.25 in N/A 3.31 in N/A 16.75 in N/A 180 lb N/A 20.25 in N/A 20 N/A 1.38 in
16400THAN N/A 16 N/A 25.50 in N/A 2.50 in N/A 18.50 in N/A 3.69 in N/A 19.00 in N/A 235 lb N/A 22.50 in N/A 20 N/A 1.50 in
18400THAN N/A 18 N/A 28.00 in N/A 2.63 in N/A 21.00 in N/A 3.88 in N/A 21.00 in N/A 285 lb N/A 24.75 in N/A 24 N/A 1.50 in
20400THAN N/A 20 N/A 30.50 in N/A 2.75 in N/A 23.00 in N/A 4.00 in N/A 23.13 in N/A 345 lb N/A 27.00 in N/A 24 N/A 1.63 in
22400THAN N/A 22 N/A 33.00 in N/A 2.88 in N/A 25.25 in N/A 4.25 in N/A 25.25 in N/A 405 lb N/A 29.25 in N/A 24 N/A 1.75 in
24400THAN N/A 24 N/A 36.00 in N/A 3.00 in N/A 27.25 in N/A 4.50 in N/A 27.63 in N/A 510 lb N/A 32.00 in N/A 24 N/A 1.88 in
Unit of Measure
1