ANSI B16.5 Welding Neck Flange Ring Type Joint Dimensions

Weld neck flange dimensions are covered in ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard, ASME B16.36 – Orifice Flanges, ASME B16.47 – Large Diameter Steel Flanges: NPS 26 Through NPS 60 Metric/Inch Standard.

Weld Neck Flange Dimensions & Approximate Masses

20190130074257 44777 - ANSI B16.5 Welding Neck Flange Ring Type Joint Dimensions

Ring Type Joint

ansi b16 5 welding neck flange ring type joint dimensions - ANSI B16.5 Welding Neck Flange Ring Type Joint Dimensions

ANSI CLASS 150, B16.5 (IN), Welding Neck Flange Ring Type Joint

Pipe Size

(NPS)

Outside Diameter of Flange

A

Thickness of Flange

C

Diameter of Bore

D

Diameter of Hub at Weld

H

Diameter of Hub at Base

J

Length of Hub

K

Diameter of Raised Face

T

Diameter of Groove

U

Groove Width

W

Groove Depth

X

Number of Bolt Holes

 

Diameter of Bolt Holes

 

Bolt Circle Diameter

P

1/2
3/4
1 4 1/4 1/2 1.049 1.315 1 15/16 2 3/16 2 1/2 1 7/8 11/32 1/4 4 5/8 3 1/8
1 1/4 4 5/8 9/16 1.380 1.660 2 5/16 2 1/4 2 7/8 2 1/4 11/32 1/4 4 5/8 3 1/2
1 1/2 5 5/8 1.610 1.900 2 9/16 2 7/16 3 1/4 2 9/16 11/32 1/4 4 5/8 3 7/8
2 6 11/16 2.067 2.375 3 1/16 2 1/2 4 3 1/4 11/32 1/4 4 3/4 4 3/4
2 1/2 7 13/16 2.469 2.875 3 9/16 2 3/4 4 3/4 4 11/32 1/4 4 3/4 5 1/2
3 7 1/2 7/8 3.068 3.500 4 1/4 2 3/4 5 1/4 4 1/2 11/32 1/4 4 3/4 6
3 1/2 8 1/2 7/8 3.548 4.00 4 13/16 2 13/16 6 1/16 5 3/16 11/32 1/4 8 3/4 7
4 9 7/8 4.026 4.500 5 5/16 3 6 3/4 5 7/8 11/32 1/4 8 3/4 7 1/2
5 10 7/8 5.047 5.563 6 7/16 3 1/2 7 5/8 6 3/4 11/32 1/4 8 7/8 8 1/2
6 11 15/16 6.065 6.625 7 9/16 3 1/2 8 5/8 7 5/8 11/32 1/4 8 7/8 9 1/2
8 13 1/2 1 1/16 7.981 8.625 9 11/16 4 10 3/4 9 3/4 11/32 1/4 8 7/8 11 3/4
10 16 1 1/8 10.020 10.750 12 4 13 12 11/32 1/4 12 1 14 1/4
12 19 1 3/16 12.00 12.750 14 3/8 4 1/2 16 15 11/32 1/4 12 1 17
14 21 1 5/16 13.25 14.00 15 3/4 5 16 3/4 15 5/8 11/32 1/4 12 1 1/8 18 3/4
16 23 1/2 1 3/8 15.25 16.00 18 5 19 17 7/8 11/32 1/4 16 1 1/8 21 1/4
18 25 1 1/2 17.25 18.00 19 7/8 5 1/2 21 1/2 20 3/8 11/32 1/4 16 1 1/4 22 3/4
20 27 1/2 1 5/8 19.25 20.00 22 5 11/16 23 1/2 22 11/32 1/4 20 1 1/4 25
22 29 1/2 1 3/4 21.25 22.00 24 5 7/8 25 1/2 24 1/4 11/32 1/4 20 1 3/8 27 1/4
24 32 1 13/16 23.25 24.00 26 1/8 6 28 26 1/2 11/32 1/4 20 1 3/8 29 1/2

ANSI CLASS 300, B16.5 (IN), Welding Neck Flange Ring Type Joint

Pipe Size

(NPS)

Outside Diameter of Flange

A

Thickness of Flange

C

Diameter of Bore

D

Diameter of Hub at Weld

H

Diameter of Hub at Base

J

Length of Hub

K

Diameter of Raised Face

T

Diameter of Groove

U

Groove Width

W

Groove Depth

X

Number of Bolt Holes

 

Diameter of Bolt Holes

 

Bolt Circle Diameter

P

1/2 3 3/4 1/2 0.622 0.840 1 1/2 2 1/16 2 1 11/32 9/32 7/32 4 5/8 2 5/8
3/4 4 5/8 9/16 0.824 1.050 1 7/8 2 1/4 2 1/2 1 11/16 11/32 1/4 4 3/4 3 1/4
1 4 7/8 5/8 1.049 1.315 2 1/8 2 7/16 2 3/4 2 11/32 1/4 4 3/4 3 1/2
1 1/4 5 1/4 11/16 1.380 1.660 2 1/2 2 9/16 3 1/8 2 3/8 11/32 1/4 4 3/4 3 7/8
1 1/2 6 1/8 3/4 1.610 1.900 2 3/4 2 11/16 3 9/16 2 11/16 11/32 1/4 4 7/8 4 1/2
2 6 1/2 13/16 2.067 2.375 3 5/16 2 3/4 4 1/4 3 1/4 15/32 5/16 8 3/4 5
2 1/2 7 1/2 15/16 2.469 2.875 3 15/16 3 5 4 15/32 5/16 8 7/8 5 7/8
3 8 1/4 1 1/16 3.068 3.500 4 5/8 3 1/8 5 3/4 4 7/8 15/32 5/16 8 7/8 6 5/8
3 1/2 9 1 1/8 3.548 4.00 5 1/4 3 3/16 6 1/4 5 3/16 15/32 5/16 8 7/8 7 1/4
4 10 1 3/16 4.026 4.500 5 3/4 3 3/8 6 7/8 5 7/8 15/32 5/16 8 7/8 7 7/8
5 11 1 5/16 5.047 5.563 7 3 7/8 8 1/4 7 1/8 15/32 5/16 8 7/8 9 1/4
6 12 1/2 1 3/8 6.065 6.625 8 1/8 3 7/8 9 1/2 8 5/16 15/32 5/16 12 7/8 10 5/8
8 15 1 9/16 7.981 8.625 10 1/4 4 3/8 11 7/8 10 5/8 15/32 5/16 12 1 13
10 17 1/2 1 13/16 10.020 10.750 12 5/8 4 5/8 14 12 3/4 15/32 5/16 16 1 1/8 15 1/4
12 20 1/2 1 15/16 12.00 12.750 14 3/4 5 1/8 16 1/4 15 15/32 5/16 16 1 1/4 17 3/4
14 23 2 1/16 13.25 14.00 16 3/4 5 5/8 18 16 1/2 15/32 5/16 20 1 1/4 20 1/4
16 25 1/2 2 3/16 15.25 16.00 19 5 3/4 20 18 1/2 15/32 5/16 20 1 3/8 22 1/2
18 28 2 5/16 17.25 18.00 21 6 1/4 22 5/8 21 15/32 5/16 24 1 3/8 24 3/4
20 30 1/2 2 7/16 19.25 20.00 23 1/8 6 3/8 25 23 17/32 3/8 24 1 3/8 27
22 33 2 9/16 21.25 22.00 25 1/4 6 1/2 27 25 19/32 7/16 24 1 5/8 29 1/4
24 36 2 11/16 23.25 24.00 27 5/8 6 5/8 29 1/2 27 1/4 21/32 7/16 24 1 5/8 32

ANSI CLASS 400, B16.5 (IN), Welding Neck Flange Ring Type Joint

Pipe Size

(NPS)

Outside

Diameterof

Flange

A

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of Hub

at Weld


H

Diameter

of Hub

at Base


J

Length

of

Hub


K

Diameter

of Raised

Face


T

Diameter

of

Grove


U

Grove

Width

 


W

Grove

Depth

 


X

Number

of

Bolt

Holes

Diameter

of

Bolt

Holes

Bolt

CircleDiameter


P

1/2 3 3/4 9/16 * 0.840 1 1/2 2 1/16 2 1 11/32 9/32 7/32 4 5/8 2 5/8
3/4 4 5/8 5/8 * 1.050 1 7/8 2 1/4 2 1/2 1 11/16 11/32 1/4 4 3/4 3 1/4
1 4 7/8 11/16 * 1.315 2 1/8 2 7/16 2 3/4 2 11/32 1/4 4 3/4 3 1/2
1 1/4 5 1/4 13/16 * 1.660 2 1/2 2 5/8 3 1/8 2 3/8 11/32 1/4 4 3/4 3 7/8
1 1/2 6 1/8 7/8 * 1.900 2 3/4 2 3/4 3 9/16 2 11/16 11/32 1/4 4 7/8 4 1/2
2 6 1/2 1 * 2.375 3 5/16 2 7/8 4 1/4 3 1/4 15/32 5/16 8 3/4 5
2 1/2 7 1/2 1 1/8 * 2.875 3 15/16 3 1/8 5 4 15/32 5/16 8 7/8 5 7/8
3 8 1/4 1 1/4 * 3.500 4 5/8 3 1/4 5 3/4 4 7/8 15/32 5/16 8 7/8 6 5/8
3 1/2 9 1 3/8 * 4.00 5 1/4 3 3/8 6 1/4 5 3/16 15/32 5/16 8 1 7 1/4
4 10 1 3/8 * 4.500 5 3/4 3 1/2 6 7/8 5 7/8 15/32 5/16 8 1 7 7/8
5 11 1 1/2 * 5.563 7 4 8 1/4 7 1/8 15/32 5/16 8 1 9 1/4
6 12 1/2 1 5/8 * 6.625 8 1/8 4 1/16 9 1/2 8 5/16 15/32 5/16 12 1 10 5/8
8 15 1 7/8 * 8.625 10 1/4 4 5/8 11 7/8 10 5/8 15/32 5/16 12 1 1/8 13
10 17 1/2 2 1/8 * 10.750 12 5/8 4 7/8 14 12 3/4 15/32 5/16 16 1 1/4 15 1/4
12 20 1/2 2 1/4 * 12.750 14 3/4 5 3/8 16 1/4 15 15/32 5/16 16 1 3/8 17 3/4
14 23 2 3/8 * 14.00 16 3/4 5 7/8 18 16 1/2 15/32 5/16 20 1 3/8 20 1/4
16 25 1/2 2 1/2 * 16.00 19 6 20 18 1/2 15/32 5/16 20 1 1/2 22 1/2
18 28 2 5/8 * 18.00 21 6 1/2 22 5/8 21 15/32 5/16 24 1 1/2 24 3/4
20 30 1/2 2 3/4 * 20.00 23 1/8 6 5/8 25 23 17/32 3/8 24 1 5/8 27
22 33 2 7/8 * 22.00 25 1/4 6 3/4 27 25 19/32 7/16 24 1 3/4 29 1/4
24 36 3 * 24.00 27 5/8 6 7/8 29 1/2 27 1/4 21/32 7/16 24 1 7/8 32

ANSI CLASS 600, B16.5 (IN), Welding Neck Flange Ring Type Joint

Pipe Size

(NPS)

Outside Diameter of Flange

A

Thickness of Flange

C

Diameter of Bore

D

Diameter of Hub at Weld

H

Diameter of Hub at Base

J

Length of Hub

K

Diameter of Raised Face

T

Diameter of Groove

U

Groove Width

W

Groove Depth

X

Number of Bolt Holes

 

Diameter of Bolt Holes

 

Bolt Circle Diameter

P

1/2 3 3/4 9/16 * 0.840 1 1/2 2 1/16 2 1 11/32 9/32 7/32 4 5/8 2 5/8
3/4 4 5/8 5/8 * 1.050 1 7/8 2 1/4 2 1/2 1 11/16 11/32 1/4 4 3/4 3 1/4
1 4 7/8 11/16 * 1.315 2 1/8 2 7/16 2 3/4 2 11/32 1/4 4 3/4 3 1/2
1 1/4 5 1/4 13/16 * 1.660 2 1/2 2 5/8 3 1/8 2 3/8 11/32 1/4 4 3/4 3 7/8
1 1/2 6 1/8 7/8 * 1.900 2 3/4 2 3/4 3 9/16 2 11/16 11/32 1/4 4 7/8 4 1/2
2 6 1/2 1 * 2.375 3 5/16 2 7/8 4 1/4 3 1/4 15/32 5/16 8 3/4 5
2 1/2 7 1/2 1 1/8 * 2.875 3 15/16 3 1/8 5 4 15/32 5/16 8 7/8 5 7/8
3 8 1/4 1 1/4 * 3.500 4 5/8 3 1/4 5 3/4 4 7/8 15/32 5/16 8 7/8 6 5/8
3 1/2 9 1 3/8 * 4.00 5 1/4 3 3/8 6 1/4 5 3/16 15/32 5/16 8 1 7 1/4
4 10 3/4 1 1/2 * 4.500 6 4 6 7/8 5 7/8 15/32 5/16 8 1 8 1/2
5 13 1 3/4 * 5.563 7 7/16 4 1/2 8 1/4 7 1/8 15/32 5/16 8 1 1/8 10 1/2
6 14 1 7/8 * 6.625 8 3/4 4 5/8 9 1/2 8 5/16 15/32 5/16 12 1 1/8 11 1/2
8 16 1/2 2 3/16 * 8.625 10 3/4 5 1/4 11 7/8 10 5/8 15/32 5/16 12 1 1/4 13 3/4
10 20 2 1/2 * 10.750 13 1/2 6 14 12 3/4 15/32 5/16 16 1 3/8 17
12 22 2 5/8 * 12.750 15 3/4 6 1/8 16 1/4 15 15/32 5/16 20 1 3/8 19 1/4
14 23 3/4 2 3/4 * 14.00 17 6 1/2 18 16 1/2 15/32 5/16 20 1 1/2 20 3/4
16 27 3 * 16.00 19 1/2 7 20 18 1/2 15/32 5/16 20 1 5/8 23 3/4
18 29 1/4 3 1/4 * 18.00 21 1/2 7 1/4 22 5/8 21 15/32 5/16 20 1 3/4 25 3/4
20 32 3 1/2 * 20.00 24 7 1/2 25 23 17/32 3/8 24 1 3/4 28 1/2
22 34 1/4 3 3/4 * 22.00 26 1/2 7 3/4 27 25 19/32 7/16 24 1 7/8 30 5/8
24 37 4 * 24.00 28 1/4 8 29 1/2 27 1/4 21/32 7/16 24 2 33

ANSI CLASS 900, B16.5 (IN), Welding Neck Flange Ring Type Joint

Pipe Size

(NPS)

Outside Diameter of Flange

A

Thickness of Flange

C

Diameter of Bore

D

Diameter of Hub at Weld

H

Diameter of Hub at Base

J

Length of Hub

K

Diameter of Raised Face

T

Diameter of Groove

U

Groove Width

W

Groove Depth

X

Number of Bolt Holes

 

Diameter of Bolt Holes

 

Bolt Circle Diameter

P

1/2 4 3/4 7/8 * 0.840 1 1/2 2 3/8 2 3/8 1 9/16 11/32 1/4 4 7/8 3 1/4
3/4 5 1/8 1 * 1.050 1 3/4 2 3/4 2 5/8 1 3/4 11/32 1/4 4 7/8 3 1/2
1 5 7/8 1 1/8 * 1.315 2 1/16 2 7/8 2 13/16 2 11/32 1/4 4 1 4
1 1/4 6 1/4 1 1/8 * 1.660 2 1/2 2 7/8 3 3/16 2 3/8 11/32 1/4 4 1 4 3/8
1 1/2 7 1 1/4 * 1.900 2 3/4 3 1/4 3 5/8 2 11/16 11/32 1/4 4 1 1/8 4 7/8
2 8 1/2 1 1/2 * 2.375 4 1/8 4 4 7/8 3 3/4 15/32 5/16 8 1 6 1/2
2 1/2 9 5/8 1 5/8 * 2.875 4 7/8 4 1/8 5 3/8 4 1/4 15/32 5/16 8 1 1/8 7 1/2
3 9 1/2 1 1/2 * 3.500 5 4 6 1/8 4 7/8 15/32 5/16 8 1 7 1/2
3 1/2
4 11 1/2 1 3/4 * 4.500 6 1/4 4 1/2 7 1/8 5 7/8 15/32 5/16 8 1 1/4 9 1/4
5 13 3/4 2 * 5.563 7 1/2 5 8 1/2 7 1/8 15/32 5/16 8 1 3/8 11
6 15 2 3/16 * 6.625 9 1/4 5 1/2 9 1/2 8 5/16 15/32 5/16 12 1 1/4 12 1/2
8 18 1/2 2 1/2 * 8.625 11 3/4 6 3/8 12 1/8 10 5/8 15/32 5/16 12 1 1/2 15 1/2
10 21 1/2 2 3/4 * 10.750 14 1/2 7 1/4 14 1/4 12 3/4 15/32 5/16 16 1 1/2 18 1/2
12 24 3 1/8 * 12.750 16 1/2 7 7/8 16 1/2 15 15/32 5/16 20 1 1/2 21
14 25 1/4 3 3/8 * 14.00 17 3/4 8 3/8 18 3/8 16 1/2 21/32 7/16 20 1 5/8 22
16 27 3/4 3 1/2 * 16.00 20 8 1/2 20 5/8 18 1/2 21/32 7/16 20 1 3/4 24 1/4
18 31 4 * 18.00 22 1/4 9 23 3/8 21 25/32 1/2 20 2 27
20 33 3/4 4 1/4 * 20.00 24 1/2 9 3/4 25 1/2 23 25/32 1/2 20 2 1/8 29 1/2
22
24 41 5 1/2 * 24.00 29 1/2 11 1/2 30 3/8 27 1/4 1 1/16 5/8 20 2 5/8 35 1/2

ANSI CLASS 1500, B16.5 (IN), Welding Neck Flange Ring Type Joint

Pipe Size

(NPS)

Outside Diameter of Flange

A

Thickness of Flange

C

Diameter of Bore

D

Diameter of Hub at Weld

H

Diameter of Hub at Base

J

Length of Hub

K

Diameter of Raised Face

T

Diameter of Groove

U

Groove Width

W

Groove Depth

X

Number of Bolt Holes

 

Diameter of Bolt Holes

 

Bolt Circle Diameter

P

1/2 4 3/4 7/8 * 0.840 1 1/2 2 3/8 2 3/8 1 9/16 11/32 1/4 4 7/8 3 1/4
3/4 5 1/8 1 * 1.050 1 3/4 2 3/4 2 5/8 1 3/4 11/32 1/4 4 7/8 3 1/2
1 5 7/8 1 1/8 * 1.315 2 1/16 2 7/8 2 13/16 2 11/32 1/4 4 1 4
1 1/4 6 1/4 1 1/8 * 1.660 2 1/2 2 7/8 3 3/16 2 3/8 11/32 1/4 4 1 4 3/8
1 1/2 7 1 1/4 * 1.900 2 3/4 3 1/4 3 5/8 2 11/16 11/32 1/4 4 1 1/8 4 7/8
2 8 1/2 1 1/2 * 2.375 4 1/8 4 4 7/8 3 3/4 15/32 5/16 8 1 6 1/2
2 1/2 9 5/8 1 5/8 * 2.875 4 7/8 4 1/8 5 3/8 4 1/4 15/32 5/16 8 1 1/8 7 1/2
3 10 1/2 1 7/8 * 3.500 5 1/4 4 5/8 6 5/8 5 3/8 15/32 5/16 8 1 1/4 8
3 1/2
4 12 1/4 2 1/8 * 4.500 6 3/8 4 7/8 7 5/8 6 3/8 15/32 5/16 8 1 3/8 9 1/2
5 14 3/4 2 7/8 * 5.563 7 3/4 6 1/8 9 7 5/8 15/32 5/16 8 1 5/8 11 1/2
6 15 1/2 3 1/4 * 6.625 9 6 3/4 9 3/4 8 5/16 17/32 3/8 12 1 1/2 12 1/2
8 19 3 5/8 * 8.625 11 1/2 8 3/8 12 1/2 10 5/8 21/32 7/16 12 1 3/4 15 1/2
10 23 4 1/4 * 10.750 14 1/2 10 14 5/8 12 3/4 21/32 7/16 12 2 19
12 26 1/2 4 7/8 * 12.750 17 3/4 11 1/8 17 1/4 15 29/32 9/16 16 2 1/8 22 1/2
14 29 1/2 5 1/4 * 14.00 19 1/2 11 3/4 19 1/4 16 1/2 1 1/16 5/8 16 2 3/8 25
16 32 1/2 5 3/4 * 16.00 21 3/4 12 1/4 21 1/2 18 1/2 1 3/16 11/16 16 2 5/8 27 3/4
18 36 6 3/8 * 18.00 23 1/2 12 7/8 24 1/8 21 1 3/16 11/16 16 2 7/8 30 1/2
20 38 3/4 7 * 20.00 25 1/4 14 26 1/2 23 1 5/16 11/16 16 3 1/8 32 3/4
22
24 46 8 * 24.00 30 16 31 1/4 27 1/4 1 7/16 13/16 16 3 5/8 39

ANSI CLASS 2500, B16.5 (IN), Welding Neck Flange Ring Type Joint

Pipe Size

(NPS)

Outside Diameter of Flange

A

Thickness of Flange

C

Diameter of Bore

D

Diameter of Hub at Weld

H

Diameter of Hub at Base

J

Length of Hub

K

Diameter of Raised Face

T

Diameter of Groove

U

Groove Width

W

Groove Depth

X

Number of Bolt Holes

 

Diameter of Bolt Holes

 

Bolt Circle Diameter

P

1/2 5 1/4 1 3/16 * 0.840 1 11/16 2 7/8 2 9/16 1 11/16 11/32 1/4 4 7/8 3 1/2
3/4 5 1/2 1 1/4 * 1.050 2 3 1/8 2 7/8 2 11/32 1/4 4 7/8 3 3/4
1 6 1/4 1 3/8 * 1.315 2 1/4 3 1/2 3 1/4 2 3/8 11/32 1/4 4 1 4 1/4
1 1/4 7 1/4 1 1/2 * 1.660 2 7/8 3 3/4 4 2 27/32 15/32 5/16 4 1 1/8 5 1/8
1 1/2 8 1 3/4 * 1.900 3 1/8 4 3/8 4 1/2 3 1/4 15/32 5/16 4 1 1/4 5 3/4
2 9 1/4 2 * 2.375 3 3/4 5 5 1/4 4 15/32 5/16 8 1 1/8 6 3/4
2 1/2 10 1/2 2 1/4 * 2.875 4 1/2 5 5/8 5 7/8 4 3/8 17/32 3/8 8 1 1/4 7 3/4
3 12 2 5/8 * 3.500 5 1/4 6 5/8 6 5/8 5 17/32 3/8 8 1 3/8 9
3 1/2
4 14 3 * 4.500 6 1/2 7 1/2 8 6 3/16 22/51 7/16 8 1 5/8 10 3/4
5 16 1/2 3 5/8 * 5.563 8 9 9 1/2 7 1/2 21/32 1/2 8 1 7/8 12 3/4
6 19 4 1/4 * 6.625 9 1/4 10 3/4 11 9 25/32 1/2 8 2 1/8 14 1/2
8 21 3/4 5 * 8.625 12 12 1/2 13 3/8 11 29/32 9/16 12 2 1/8 17 1/4
10 26 1/2 6 1/2 * 10.75 14 3/4 16 1/2 16 3/4 13 1/2 1 3/16 11/16 12 2 5/8 21 1/4
12 30 7 1/4 * 12.75 17 3/8 18 1/4 19 1/2 16 1 5/16 11/16 12 2 7/8 24 3/8

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