ANSI B16.5 Class 900 Forged Flanges
WeldNeck Forged Flange Threaded Forged Flange
Weld Neck Forged Flange Threaded Forged Flange

Lap Joint Forged Flange

Socket Weld Forged Flange
Lap Joint Forged Flange Socket Weld Forged Flange
Blind Forged Flange Slip On Forged Flange
Blind Forged Flange
Slip On Forged Flange

 

Nom. Pipe Size O T R X #/Dia of Holesa Bolt Circle Dia B B2b B3 H L L2 L3c r C Thr
Sizes 1/2" through 2 1/2" are identical to class 1500.
3 9.50 1.50 5.00 5.00 8-1.00 7.50 3.57 Texas Flange Flanges 3.60 3.50 2.12 4.00 2.12 0.38 3.63 1.62
4 11.50 1.75 6.19 6.25 8-1.25 9.25 4.57 4.60 4.50 2.75 4.50 2.75 0.44 4.63 1.88
5 13.75 2.00 7.31 7.50 8-1.38 11.00 5.66 5.69 5.56 3.12 5.00 3.12 0.44 5.69 2.12
6 15.00 2.19 8.50 9.25 12-1.25 12.50 6.72 6.75 6.63 3.38 5.50 3.38 0.50 6.75 2.25
8 18.50 2.50 10.63 11.75 12-1.50 15.50 8.72 8.75 8.63 4.00 6.38 4.50 0.50 8.75 2.50
10 21.50 2.75 12.75 14.50 16-1.50 18.50 10.88 10.92 10.75 4.25 7.25 5.00 0.50 10.88 2.81
12 24.00 3.12 15.00 16.50 20-1.50 21.00 12.88 12.92 12.75 4.63 7.88 5.62 0.50 12.94 3.00
14 25.25 3.38 16.25 17.75 20-1.63 22.00 14.14 14.18 14.00 5.12 8.38 6.12 0.50 14.19 3.25
16 27.75 3.50 18.50 20.00 20-1.75 24.25 16.16 16.19 16.00 5.25 8.50 6.50 0.50 16.19 3.38
18 31.00 4.00 21.00 22.25 20-2.00 27.00 18.18 18.20 18.00 6.00 9.00 7.50 0.50 18.19 3.50
20 33.75 4.25 23.00 24.50 20-2.13 29.50 20.20 20.25 20.00 6.25 9.75 8.25 0.50 20.19 3.62
24 41.00 5.50 27.25 29.50 20-2.63 35.50 24.25 24.25 24.00 8.00 11.50 10.50 0.50 24.19 4.00
Dimensions are in inches.  
(a)-  Bolt hole diameter 1/8 in. larger than bolt diameter.
(b)-  See bore chart for wall thicknesses.
(c)-  This dimension is commonly associated with "true" lap joints.  Industry standard is to make to the slip on length through the hub.

ANSI B16.5 Class 900 Forged Flange PDF (for printing).