ANSI B16.5 Welding Neck Flange Raised Face & Flat Face 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

20190130074243 94078 - ANSI B16.5 Welding Neck Flange Raised Face & Flat Face Dimensions Raised Face & Flat Face

20190130074424 50769 - ANSI B16.5 Welding Neck Flange Raised Face & Flat Face Dimensions

ANSI CLASS 150, B16.5 (IN), Welding Neck Flange Raised Face & Flat Face

Pipe Size

(NPS)

Outside Diameter of Flange

A

Diameter of Raised Face

B

Thickness of Flange

C

Diameter of Bore

D

Diameter of Hub at Weld

H

Diameter of Hub at Base

J

Length of Hub

K

Number of Bolt Holes

NBH

Diameter of Bolt Holes

 DBH

Bolt Circle Diameter

P

Approx. Weight

(lb)

AW

1/2 3 1/2 1 3/8 7/16 0.622 0.840 1 3/16 1 7/8 4 5/8 2 3/8 2
3/4 3 7/8 1 11/16 1/2 0.824 1.050 1 1/2 2 1/16 4 5/8 2 3/4 2
1 4 1/4 2 9/16 1.049 1.315 1 15/16 2 3/16 4 5/8 3 1/8 2.5
1 1/4 4 5/8 2 1/2 5/8 1.380 1.660 2 5/16 2 1/4 4 5/8 3 1/2 2.5
1 1/2 5 2 7/8 11/16 1.610 1.900 2 9/16 2 7/16 4 5/8 3 7/8 4
2 6 3 5/8 3/4 2.067 2.375 3 1/16 2 1/2 4 3/4 4 3/4 6
2 1/2 7 4 1/8 7/8 2.469 2.875 3 9/16 2 3/4 4 3/4 5 1/2 10
3 7 1/2 5 15/16 3.068 3.500 4 1/4 2 3/4 4 3/4 6 11
3 1/2 8 1/2 5 1/2 15/16 3.548 4.00 4 13/16 2 13/16 8 3/4 7 12
4 9 6 3/16 15/16 4.026 4.500 5 5/16 3 8 3/4 7 1/2 15
5 10 7 5/16 15/16 5.047 5.563 6 7/16 3 1/2 8 7/8 8 1/2 19
6 11 8 1/2 1 6.065 6.625 7 9/16 3 1/2 8 7/8 9 1/2 24
8 13 1/2 10 5/8 1 1/8 7.981 8.625 9 11/16 4 8 7/8 11 3/4 39
10 16 12 3/4 1 3/16 10.020 10.750 12 4 12 1 14 1/4 52
12 19 15 1 1/4 12.00 12.750 14 3/8 4 1/2 12 1 17 80
14 21 16 1/4 1 3/8 13.25 14.00 15 3/4 5 12 1 1/8 18 3/4 120
16 23 1/2 18 1/2 1 7/16 15.25 16.00 18 5 16 1 1/8 21 1/4 127
18 25 21 1 9/16 17.25 18.00 19 7/8 5 1/2 16 1 1/4 22 3/4 140
20 27 1/2 23 1 11/16 19.25 20.00 22 5 11/16 20 1 1/4 25 170
22 29 1/2 25 1/4 1 13/16 21.25 22.00 24 5 7/8 20 1 3/8 27 1/4 224
24 32 27 1/4 1 7/8 23.25 24.00 26 1/8 6 20 1 3/8 29 1/2 260

ANSI CLASS 300, B16.5 (IN), Welding Neck Flange Raised Face & Flat Face

Pipe Size

(NPS)

Outside Diameter of Flange

A

Diameter of Raised Face

B

Thickness of Flange

C

Diameter of Bore

D

Diameter of Hub at Weld

H

Diameter of Hub at Base

J

Length of Hub

K

Number of Bolt Holes

NBH

Diameter of Bolt Holes

DBH

Bolt Circle Diameter

P

Approx. Weight

(lb)

AW

1/2 3 3/4 1 3/8 9/16 0.622 0.840 1 1/2 2 1/16 4 5/8 2 5/8 2
3/4 4 5/8 1 11/16 5/8 0.824 1.050 1 7/8 2 1/4 4 3/4 3 1/4 3
1 4 7/8 2 11/16 1.049 1.315 2 1/8 2 7/16 4 3/4 3 1/2 4
1 1/4 5 1/4 2 1/2 3/4 1.380 1.660 2 1/2 2 9/16 4 3/4 3 7/8 6
1 1/2 6 1/8 2 7/8 13/16 1.610 1.900 2 3/4 2 11/16 4 7/8 4 1/2 8
2 6 1/2 3 5/8 7/8 2.067 2.375 3 5/16 2 3/4 8 3/4 5 9
2 1/2 7 1/2 4 1/8 1 2.469 2.875 3 15/16 3 8 7/8 5 7/8 12
3 8 1/4 5 1 1/8 3.068 3.500 4 5/8 3 1/8 8 7/8 6 5/8 15
3 1/2 9 5 1/2 1 3/16 3.548 4.00 5 1/4 3 3/16 8 7/8 7 1/4 18
4 10 6 3/16 1 1/4 4.026 4.500 5 3/4 3 3/8 8 7/8 7 7/8 25
5 11 7 5/16 1 3/8 5.047 5.563 7 3 7/8 8 7/8 9 1/4 32
6 12 1/2 8 1/2 1 7/16 6.065 6.625 8 1/8 3 7/8 12 7/8 10 5/8 42
8 15 10 5/8 1 5/8 7.981 8.625 10 1/4 4 3/8 12 1 13 67
10 17 1/2 12 3/4 1 7/8 10.020 10.750 12 5/8 4 5/8 16 1 1/8 15 1/4 91
12 20 1/2 15 2 12.00 12.750 14 3/4 5 1/8 16 1 1/4 17 3/4 138
14 23 16 1/4 2 1/8 13.25 14.00 16 3/4 5 5/8 20 1 1/4 20 1/4 186
16 25 1/2 18 1/2 2 1/4 15.25 16.00 19 5 3/4 20 1 3/8 22 1/2 246
18 28 21 2 3/8 17.25 18.00 21 6 1/4 24 1 3/8 24 3/4 305
20 30 1/2 23 2 1/2 19.25 20.00 23 1/8 6 3/8 24 1 3/8 27 378
22 33 25 1/4 2 5/8 21.25 22.00 25 1/4 6 1/2 24 1 5/8 29 1/4 425
24 36 27 1/4 2 3/4 23.25 24.00 27 5/8 6 5/8 24 1 5/8 32 545

ANSI CLASS 400, B16.5 (IN), Welding Neck Flange Raised Face & Flat Face

Pipe Size

(NPS)

Outside Diameter of Flange

A

Diameter of Raised Face

B

Thickness of Flange

C

Diameter of Bore

D

Diameter of Hub at Weld

H

Diameter of Hub at Base

J

Length of Hub

K

Number of Bolt Holes

NBH

Diameter of Bolt Holes

DBH

Bolt Circle Diameter

P

Approx. Weight

(lb)

AW

1/2 3 3/4 1 3/8 9/16 * 0.840 1 1/2 2 1/16 4 5/8 2 5/8 3
3/4 4 5/8 1 11/16 5/8 * 1.050 1 7/8 2 1/4 4 3/4 3 1/4 4
1 4 7/8 2 11/16 * 1.315 2 1/8 2 7/16 4 3/4 3 1/2 5
1 1/4 5 1/4 2 1/2 13/16 * 1.660 2 1/2 2 5/8 4 3/4 3 7/8 7
1 1/2 6 1/8 2 7/8 7/8 * 1.900 2 3/4 2 3/4 4 7/8 4 1/2 10
2 6 1/2 3 5/8 1 * 2.375 3 5/16 2 7/8 8 3/4 5 12
2 1/2 7 1/2 4 1/8 1 1/8 * 2.875 3 15/16 3 1/8 8 7/8 5 7/8 18
3 8 1/4 5 1 1/4 * 3.500 4 5/8 3 1/4 8 7/8 6 5/8 23
3 1/2 9 5 1/2 1 3/8 * 4.00 5 1/4 3 3/8 8 1 7 1/4 26
4 10 6 3/16 1 3/8 * 4.500 5 3/4 3 1/2 8 1 7 7/8 35
5 11 7 5/16 1 1/2 * 5.563 7 4 8 1 9 1/4 43
6 12 1/2 8 1/2 1 5/8 * 6.625 8 1/8 4 1/16 12 1 10 5/8 57
8 15 10 5/8 1 7/8 * 8.625 10 1/4 4 5/8 12 1 1/8 13 89
10 17 1/2 12 3/4 2 1/8 * 10.750 12 5/8 4 7/8 16 1 1/4 15 1/4 126
12 20 1/2 15 2 1/4 * 12.750 14 3/4 5 3/8 16 1 3/8 17 3/4 177
14 23 16 1/4 2 3/8 * 14.00 16 3/4 5 7/8 20 1 3/8 20 1/4 233
16 25 1/2 18 1/2 2 1/2 * 16.00 19 6 20 1 1/2 22 1/2 294
18 28 21 2 5/8 * 18.00 21 6 1/2 24 1 1/2 24 3/4 360
20 30 1/2 23 2 3/4 * 20.00 23 1/8 6 5/8 24 1 5/8 27 445
22 33 25 1/4 2 7/8 * 22.00 25 1/4 6 3/4 24 1 3/4 29 1/4 465
24 36 27 1/4 3 * 24.00 27 5/8 6 7/8 24 1 7/8 32 640

ANSI CLASS 600, B16.5 (IN), Welding Neck Flange Raised Face & Flat Face

Pipe Size

(NPS)

Outside Diameter of Flange

A

Diameter of Raised Face

B

Thickness of Flange

C

Diameter of Bore

D

Diameter of Hub at Weld

H

Diameter of Hub at Base

J

Length of Hub

K

Number of Bolt Holes

NBH

Diameter of Bolt Holes

DBH

Bolt Circle Diameter

P

Approx. Weight

(lb)

AW

1/2 3 3/4 1 3/8 9/16 * 0.840 1 1/2 2 1/16 4 5/8 2 5/8 3
3/4 4 5/8 1 11/16 5/8 * 1.050 1 7/8 2 1/4 4 3/4 3 1/4 4
1 4 7/8 2 11/16 * 1.315 2 1/8 2 7/16 4 3/4 3 1/2 5
1 1/4 5 1/4 2 1/2 13/16 * 1.660 2 1/2 2 5/8 4 3/4 3 7/8 7
1 1/2 6 1/8 2 7/8 7/8 * 1.900 2 3/4 2 3/4 4 7/8 4 1/2 10
2 6 1/2 3 5/8 1 * 2.375 3 5/16 2 7/8 8 3/4 5 12
2 1/2 7 1/2 4 1/8 1 1/8 * 2.875 3 15/16 3 1/8 8 7/8 5 7/8 18
3 8 1/4 5 1 1/4 * 3.500 4 5/8 3 1/4 8 7/8 6 5/8 23
3 1/2 9 5 1/2 1 3/8 * 4.00 5 1/4 3 3/8 8 1 7 1/4 26
4 10 3/4 6 3/16 1 1/2 * 4.500 6 4 8 1 8 1/2 42
5 13 7 5/16 1 3/4 * 5.563 7 7/16 4 1/2 8 1 1/8 10 1/2 68
6 14 8 1/2 1 7/8 * 6.625 8 3/4 4 5/8 12 1 1/8 11 1/2 81
8 16 1/2 10 5/8 2 3/16 * 8.625 10 3/4 5 1/4 12 1 1/4 13 3/4 117
10 20 12 3/4 2 1/2 * 10.75 13 1/2 6 16 1 3/8 17 189
12 22 15 2 5/8 * 12.75 15 3/4 6 1/8 20 1 3/8 19 1/4 226
14 23 3/4 16 1/4 2 3/4 * 14.00 17 6 1/2 20 1 1/2 20 3/4 347
16 27 18 1/2 3 * 16.00 19 1/2 7 20 1 5/8 23 3/4 481
18 29 1/4 21 3 1/4 * 18.00 21 1/2 7 1/4 20 1 3/4 25 3/4 555
20 32 23 3 1/2 * 20.00 24 7 1/2 24 1 3/4 28 1/2 690
22 34 1/4 25 1/4 3 3/4 * 22.00 26 1/2 7 3/4 24 1 7/8 30 5/8 620
24 37 27 1/4 4 * 24.00 28 1/4 8 24 2 33 977

ANSI CLASS 900, B16.5 (IN), Welding Neck Flange Raised Face & Flat Face

Pipe Size

(NPS)

Outside Diameter of Flange

A

Diameter of Raised Face

B

Thickness of Flange

C

Diameter of Bore

D

Diameter of Hub at Weld

H

Diameter of Hub at Base

J

Length of Hub

K

Number of Bolt Holes

NBH

Diameter of Bolt Holes

 DBH

Bolt Circle Diameter

P

Approx. Weight

(lb)

AW

1/2 4 3/4 1 3/8 7/8 * 0.840 1 1/2 2 3/8 4 7/8 3 1/4 7
3/4 5 1/8 1 11/16 1 * 1.050 1 3/4 2 3/4 4 7/8 3 1/2 7
1 5 7/8 2 1 1/8 * 1.315 2 1/16 2 7/8 4 1 4 9
1 1/4 6 1/4 2 1/2 1 1/8 * 1.660 2 1/2 2 7/8 4 1 4 3/8 10
1 1/2 7 2 7/8 1 1/4 * 1.900 2 3/4 3 1/4 4 1 1/8 4 7/8 14
2 8 1/2 3 5/8 1 1/2 * 2.375 4 1/8 4 8 1 6 1/2 25
2 1/2 9 5/8 4 1/8 1 5/8 * 2.875 4 7/8 4 1/8 8 1 1/8 7 1/2 36
3 9 1/2 5 1 1/2 * 3.500 5 4 8 1 7 1/2 32
3 1/2
4 11 1/2 6 3/16 1 3/4 * 4.500 6 1/4 4 1/2 8 1 1/4 9 1/4 51
5 13 3/4 7 5/16 2 * 5.563 7 1/2 5 8 1 3/8 11 86
6 15 8 1/2 2 3/16 * 6.625 9 1/4 5 1/2 12 1 1/4 12 1/2 110
8 18 1/2 10 5/8 2 1/2 * 8.625 11 3/4 6 3/8 12 1 1/2 15 1/2 187
10 21 1/2 12 3/4 2 3/4 * 10.750 14 1/2 7 1/4 16 1 1/2 18 1/2 268
12 24 15 3 1/8 * 12.750 16 1/2 7 7/8 20 1 1/2 21 372
14 25 1/4 16 1/4 3 3/8 * 14.00 17 3/4 8 3/8 20 1 5/8 22 562
16 27 3/4 18 1/2 3 1/2 * 16.00 20 8 1/2 20 1 3/4 24 1/4 685
18 31 21 4 * 18.00 22 1/4 9 20 2 27 924
20 33 3/4 23 4 1/4 * 20.00 24 1/2 9 3/4 20 2 1/8 29 1/2 1164
22
24 41 27 1/4 5 1/2 * 24.00 29 1/2 11 1/2 20 2 5/8 35 1/2 2107

ANSI CLASS 1500, B16.5 (IN), Welding Neck Flange Raised Face & Flat Face

Pipe Size

(NPS)

Outside Diameter of Flange

A

Diameter of Raised Face

B

Thickness of Flange

C

Diameter of Bore

D

Diameter of Hub at Weld

H

Diameter of Hub at Base

J

Length of Hub

K

Number of Bolt Holes

NBH

Diameter of Bolt Holes

DBH

Bolt Circle Diameter

P

Approx. Weight

(lb)

AW

1/2 4 3/4 1 3/8 7/8 * 0.840 1 1/2 2 3/8 4 7/8 3 1/4 9
3/4 5 1/8 1 11/16 1 * 1.050 1 3/4 2 3/4 4 7/8 3 1/2 9
1 5 7/8 2 1 1/8 * 1.315 2 1/16 2 7/8 4 1 4 9
1 1/4 6 1/4 2 1/2 1 1/8 * 1.660 2 1/2 2 7/8 4 1 4 3/8 10
1 1/2 7 2 7/8 1 1/4 * 1.900 2 3/4 3 1/4 4 1 1/8 4 7/8 14
2 8 1/2 3 5/8 1 1/2 * 2.375 4 1/8 4 8 1 6 1/2 25
2 1/2 9 5/8 4 1/8 1 5/8 * 2.875 4 7/8 4 1/8 8 1 1/8 7 1/2 36
3 10 1/2 5 1 7/8 * 3.500 5 1/4 4 5/8 8 1 1/4 8 48
3 1/2
4 12 1/4 6 3/16 2 1/8 * 4.500 6 3/8 4 7/8 8 1 3/8 9 1/2 73
5 14 3/4 7 5/16 2 7/8 * 5.563 7 3/4 6 1/8 8 1 5/8 11 1/2 132
6 15 1/2 8 1/2 3 1/4 * 6.625 9 6 3/4 12 1 1/2 12 1/2 164
8 19 10 5/8 3 5/8 * 8.625 11 1/2 8 3/8 12 1 3/4 15 1/2 273
10 23 12 3/4 4 1/4 * 10.750 14 1/2 10 12 2 19 454
12 26 1/2 15 4 7/8 * 12.750 17 3/4 11 1/8 16 2 1/8 22 1/2 690
14 29 1/2 16 1/4 5 1/4 * 14.00 19 1/2 11 3/4 16 2 3/8 25 940
16 32 1/2 18 1/2 5 3/4 * 16.00 21 3/4 12 1/4 16 2 5/8 27 3/4 1250
18 36 21 6 3/8 * 18.00 23 1/2 12 7/8 16 2 7/8 30 1/2 1625
20 38 3/4 23 7 * 20.00 25 1/4 14 16 3 1/8 32 3/4 2050
22
24 46 27 1/4 8 * 24.00 30 16 16 3 5/8 39 3325

ANSI CLASS 2500, B16.5 (IN), Welding Neck Flange Raised Face & Flat Face

Pipe Size

(NPS)

Outside Diameter of Flange

A

Diameter of Raised Face

B

Thickness of Flange

C

Diameter of Bore

D

Diameter of Hub at Weld

H

Diameter of Hub at Base

J

Length of Hub

K

Number of Bolt Holes

NBH

Diameter of Bolt Holes

DBH

Bolt Circle Diameter

P

Approx. Weight

(lb)

AW

1/2 5 1/4 1 3/8 1 3/16 * 0.840 1 11/16 2 7/8 4 7/8 3 1/2 8
3/4 5 1/2 1 11/16 1 1/4 * 1.050 2 3 1/8 4 7/8 3 3/4 9
1 6 1/4 2 1 3/8 * 1.315 2 1/4 3 1/2 4 1 4 1/4 13
1 1/4 7 1/4 2 1/2 1 1/2 * 1.660 2 7/8 3 3/4 4 1 1/8 5 1/8 20
1 1/2 8 2 7/8 1 3/4 * 1.900 3 1/8 4 3/8 4 1 1/4 5 3/4 28
2 9 1/4 3 5/8 2 * 2.375 3 3/4 5 8 1 1/8 6 3/4 42
2 1/2 10 1/2 4 1/8 2 1/4 * 2.900 4 1/2 5 5/8 8 1 1/4 7 3/4 52
3 12 5 2 5/8 * 3.500 5 1/4 6 5/8 8 1 3/8 9 94
3 1/2
4 14 6 3/16 3 * 4.500 6 1/2 7 1/2 8 1 5/8 10 3/4 146
5 16 1/2 7 5/16 3 5/8 * 5.563 8 9 8 1 7/8 12 3/4 244
6 19 8 1/2 4 1/4 * 6.625 9 1/4 10 3/4 8 2 1/8 14 1/2 378
8 21 3/4 10 5/8 5 * 8.625 12 12 1/2 12 2 1/8 17 1/4 576
10 26 1/2 12 3/4 6 1/2 * 10.750 14 3/4 16 1/2 12 2 5/8 21 1/4 1068
12 30 15 7 1/4 * 12.750 17 3/8 18 1/4 12 2 7/8 24 3/8 1608

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