• ANSI B16.5 Class 400 Weld Neck Flange
  • 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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Item #

Nominal Pipe Size

Outside Diameter (O)

Thickness (T)

Raised Face Diameter (R)

Length Thru Hub (Y)

Point of Weld (A)

Hub Diameter (X)

Bore (B)

Approximate Weight (lbs)

Bolt Circle (C)

Number of Holes

Diameter of Holes

N/A 1/2 N/A 3.75 N/A 0.56 N/A 1.38 N/A 2.06 N/A 0.84 N/A 1.50 N/A Specified by purchaser N/A 2 N/A 2.63 N/A 4 N/A 0.63
N/A 3/4 N/A 4.63 N/A 0.63 N/A 1.69 N/A 2.25 N/A 1.05 N/A 1.88 N/A Specified by purchaser N/A 4 N/A 3.25 N/A 4 N/A 0.75
N/A 1 N/A 4.88 N/A 0.69 N/A 2.00 N/A 2.44 N/A 1.32 N/A 2.13 N/A Specified by purchaser N/A 4 N/A 3.50 N/A 4 N/A 0.75
N/A 1 1/4 N/A 5.25 N/A 0.81 N/A 2.50 N/A 2.63 N/A 1.66 N/A 2.50 N/A Specified by purchaser N/A 6 N/A 3.88 N/A 4 N/A 0.75
N/A 1 1/2 N/A 6.13 N/A 0.88 N/A 2.88 N/A 2.75 N/A 1.90 N/A 2.75 N/A Specified by purchaser N/A 8 N/A 4.50 N/A 4 N/A 0.88
N/A 2 N/A 6.50 N/A 1.00 N/A 3.63 N/A 2.88 N/A 2.38 N/A 3.31 N/A Specified by purchaser N/A 12 N/A 5.00 N/A 8 N/A 0.75
N/A 2 1/2 N/A 7.50 N/A 1.13 N/A 4.13 N/A 3.13 N/A 2.88 N/A 3.94 N/A Specified by purchaser N/A 18 N/A 5.88 N/A 8 N/A 0.88
N/A 3 N/A 8.25 N/A 1.25 N/A 5.00 N/A 3.25 N/A 3.50 N/A 4.63 N/A Specified by purchaser N/A 23 N/A 6.63 N/A 8 N/A 0.88
N/A 3 1/2 N/A 9.00 N/A 1.38 N/A 5.50 N/A 3.38 N/A 4.00 N/A 5.25 N/A Specified by purchaser N/A 26 N/A 7.25 N/A 8 N/A 1.00
N/A 4 N/A 10.75 N/A 1.50 N/A 6.19 N/A 4.00 N/A 4.50 N/A 6.00 N/A Specified by purchaser N/A 42 N/A 8.50 N/A 8 N/A 1.00
N/A 5 N/A 13.00 N/A 1.75 N/A 7.31 N/A 4.50 N/A 5.56 N/A 7.44 N/A Specified by purchaser N/A 68 N/A 10.50 N/A 8 N/A 1.13
N/A 6 N/A 14.00 N/A 1.88 N/A 8.50 N/A 4.63 N/A 6.63 N/A 8.75 N/A Specified by purchaser N/A 81 N/A 11.50 N/A 12 N/A 1.13
N/A 8 N/A 16.50 N/A 2.19 N/A 10.63 N/A 5.25 N/A 8.63 N/A 10.75 N/A Specified by purchaser N/A 120 N/A 13.75 N/A 12 N/A 1.25
N/A 10 N/A 20.00 N/A 2.50 N/A 12.75 N/A 6.00 N/A 10.75 N/A 13.50 N/A Specified by purchaser N/A 190 N/A 17.00 N/A 16 N/A 1.38
N/A 12 N/A 22.00 N/A 2.63 N/A 15.00 N/A 6.13 N/A 12.75 N/A 15.75 N/A Specified by purchaser N/A 225 N/A 19.25 N/A 20 N/A 1.38
N/A 14 N/A 23.75 N/A 2.75 N/A 16.25 N/A 6.50 N/A 14.00 N/A 17.00 N/A Specified by purchaser N/A 280 N/A 20.75 N/A 20 N/A 1.50
N/A 16 N/A 27.00 N/A 3.00 N/A 18.50 N/A 7.00 N/A 16.00 N/A 19.50 N/A Specified by purchaser N/A 390 N/A 23.75 N/A 20 N/A 1.63
N/A 18 N/A 29.25 N/A 3.25 N/A 21.00 N/A 7.25 N/A 18.00 N/A 21.50 N/A Specified by purchaser N/A 475 N/A 25.75 N/A 20 N/A 1.75
N/A 20 N/A 32.00 N/A 3.50 N/A 23.00 N/A 7.50 N/A 20.00 N/A 24.00 N/A Specified by purchaser N/A 590 N/A 28.50 N/A 24 N/A 1.75
N/A 22 N/A 34.25 N/A 3.75 N/A 25.25 N/A 7.75 N/A 22.00 N/A 26.25 N/A Specified by purchaser N/A 720 N/A 30.63 N/A 24 N/A 1.88
N/A 24 N/A 37.00 N/A 4.00 N/A 27.25 N/A 8.00 N/A 24.00 N/A 28.25 N/A Specified by purchaser N/A 830 N/A 33.00 N/A 24 N/A 2.00
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