ANSI/ ASME B16.5 Flange

View ASME B16 5 Class 600 Flange Dimensions, ASME B16 5 Class 300 Flanges Manufacturers

ANSI/ ASME B16.5 Flange is the specification and standard for stainless steel flanges that range between ½ inches and 24 inches in outer diameter. These are used in different types of applications such as water lines, food processing industries, power generation and sea water applications. The ANSI B16.5 flange is used to connect two parts of a piping structure together with a raised surface to allow for more attachment by welding or to have bolt holes. There are different types of flanges such as the ANSI B16.5 blind flange which is used to terminate a pipe line.

ANSI/ ASME B16.5 Flange

Check ANSI B16.5 Stainless Steel Flange Ratings , Ask for ASME B16.5 Flange Material Price List

The blind flanges can either be welded to make a permanent closure or be bolted for a temporary closure of the pipes. The ASA B16.5 flange also can be of different types by means of production method and applications. There are socket weld, neck weld, butt weld and other types of flanges. The most commonly used ANSI b16,5 pipe flange is the buttweld flange because of its ease of application. Sometimes when the application needs a stronger connection through welding of the flange, the ASME B16.5 weld neck flange is deemed suitable. Please make sure to know all about your flanges by contacting us.

Specification of ANSI/ ASME B16.5 Flange

Size  1/2″ (15 NB) to 48″ (1200NB)
Standards  ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings.
Pressure Ratings PN6, PN10, PN16, PN25, PN40, PN64 etc.
Pressure class  150#, 300#, 600#, 1500#
Dimensions and Pressure Ratings Table D, E, F, & H, MSS- SP-44, BS3293, ANSI, BS4504, PN6, 10, 16, 25, 64 BS10, DIN Standards
Coating/Surface Treatment Yellow Transparent, Anti-rust Paint, Oil Black Paint, Zinc Plated, Cold and Hot Dip Galvanized.

ASME B16.5 Pipe Flanges and Flanged Fittings Can be Manufactured in Range of NPS 1/2 through NPS 24 Inch

ASME B16.5 Class 150 Flange Dimensions

ASME B16.5 Flange

Nominal Size Outside Diameter
(OD)
Min. Thickness
(T)
RF Dia.
(R)
No. of Bolt Holes Diameter of Holes Bolt Circle
(BC)
SO Bore ID
(SB)
WN Bore ID
(WB)
Dia. Hub Base
(HB)
Dia. of Hub Top
(HT)
SO LTH
(SL)
WN LTH
(WL)
12 3.50 0.38 1.38 4 0.62 2.38 0.88 0.62 1.19 0.84 0.56 1.81
34 3.88 0.44 1.69 4 0.62 2.75 1.09 0.82 1.50 1.05 0.56 2.00
1 4.25 0.50 2.00 4 0.62 3.12 1.36 1.05 1.94 1.32 0.62 2.12
114 4.62 0.56 2.50 4 0.62 3.50 1.70 1.38 2.31 1.66 0.75 2.19
112 5.00 0.62 2.88 4 0.62 3.88 1.95 1.61 2.56 1.90 0.81 2.38
2 6.00 0.69 3.62 4 0.75 4.75 2.44 2.07 3.06 2.38 0.94 2.44
212 7.00 0.81 4.12 4 0.75 5.50 2.94 2.47 3.56 2.88 1.06 2.69
3 7.50 0.88 5.00 4 0.75 6.00 3.57 3.07 4.25 3.50 1.12 2.69
312 8.50 0.88 5.50 8 0.75 7.00 4.07 3.55 4.81 4.00 1.19 2.75
4 9.00 0.88 6.19 8 0.75 7.50 4.57 4.03 5.31 4.50 1.25 2.94
5 10.00 0.88 7.31 8 0.88 8.50 5.66 5.05 6.44 5.56 1.38 3.44
6 11.00 0.94 8.50 8 0.88 9.50 6.72 6.07 7.56 6.63 1.50 3.44
8 13.50 1.06 10.62 8 0.88 11.75 8.72 7.98 9.69 8.63 1.69 3.94
10 16.00 1.12 12.75 12 1.00 14.25 10.88 10.02 12.00 10.75 1.88 3.94
12 19.00 1.19 15.00 12 1.00 17.00 12.88 12.00 14.38 12.75 2.12 4.44
14 21.00 1.31 16.25 12 1.12 18.75 14.14 13.25 15.75 14.00 2.19 4.94
16 23.50 1.38 18.50 16 1.12 21.25 16.16 15.25 18.00 16.00 2.44 4.94
18 25.00 1.50 21.00 16 1.25 22.75 18.18 17.25 19.88 18.00 2.62 5.44
20 27.50 1.62 23.00 20 1.25 25.00 20.20 19.25 22.00 20.00 2.81 5.62
22 29.50 1.75 25.25 20 1.38 27.25 22.22 21.25 24.25 22.00 3.07 5.82
24 32.00 1.81 27.25 20 1.38 29.50 24.25 23.25 26.12 24.00 3.19 5.94

ANSI B16.5 Class 300 Flange Dimensions in mm

ASME B16.5 Flange

Nominal Size Outside Diameter
(OD)
Min. Thickness
(T)
RF Dia.
(R)
No. of Bolt Holes Diameter of Holes Bolt Circle
(BC)
SO Bore ID
(SB)
WN Bore ID
(WB)
Dia. Hub Base
(HB)
Dia. Hub Top
(HT)
SO LTH
(SL)
WN LTH
(WL)
12 3.75 0.50 1.38 4 0.63 2.62 0.88 0.62 1.50 0.84 0.81 2.00
34 4.62 0.56 1.69 4 0.75 3.25 1.09 0.82 1.88 1.05 0.94 2.19
1 4.88 0.62 2.00 4 0.75 3.50 1.36 1.05 2.12 1.32 1.00 2.38
114 5.25 0.69 2.50 4 0.75 3.88 1.70 1.38 2.50 1.66 1.00 2.50
112 6.12 0.75 2.88 4 0.88 4.50 1.95 1.61 2.75 1.90 1.13 2.63
2 6.50 0.81 3.62 8 0.75 5.00 2.44 2.07 3.31 2.38 1.25 2.69
212 7.50 0.94 4.12 8 0.88 5.88 2.94 2.47 3.94 2.88 1.44 2.94
3 8.25 1.06 5.00 8 0.88 6.62 3.57 3.07 4.62 3.50 1.63 3.06
312 9.00 1.12 5.50 8 0.88 7.25 4.07 3.55 5.25 4.00 1.69 3.13
4 10.00 1.19 6.19 8 0.88 7.88 4.57 4.03 5.75 4.50 1.82 3.32
5 11.00 1.31 7.31 8 0.88 9.25 5.66 5.05 7.00 5.56 1.94 3.82
6 12.50 1.38 8.50 12 0.88 10.62 6.72 6.07 8.12 6.63 2.00 3.82
8 15.00 1.56 10.62 12 1.00 13.00 8.72 7.98 10.25 8.63 2.38 4.32
10 17.50 1.81 12.75 16 1.12 15.25 10.88 10.02 12.62 10.75 2.56 4.56
12 20.50 1.94 15.00 16 1.25 17.75 12.88 12.00 14.75 12.75 2.82 5.06
14 23.00 2.06 16.25 20 1.25 20.25 14.14 13.25 16.75 14.00 2.94 5.56
16 25.50 2.19 18.50 20 1.38 22.50 16.16 15.25 19.00 16.00 3.19 5.69
18 28.00 2.31 21.00 24 1.38 24.75 18.18 17.25 21.00 18.00 3.44 6.19
20 30.50 2.44 23.12 24 1.38 27.00 20.20 19.25 23.12 20.00 3.69 6.32
22 33.00 2.57 25.25 24 1.63 29.25 22.22 21.25 25.25 22.00 3.93 6.43
24 36.00 2.69 27.62 24 1.63 32.00 24.25 23.25 27.62 24.00 4.13 6.56

ANSI B16.5 Class 400 Flange Dimensions

ASME B16.5 Flange

Nominal Size Outside Diameter
(OD)
Min. Thickness
(T)
RF Dia.
(R)
No. of Bolt Holes Diameter of Holes Bolt Circle
(BC)
SO Bore ID
(SB)
Dia. Hub Base
(HB)
Dia. Hub Top
(HT)
SO LTH
(SL)
WN LTH
(WL)
* WN Bore ID
(WB)
12 3.75 0.56 1.38 4 0.63 2.62 0.88 1.5 0.84 0.88 2.06 *
34 4.62 0.62 1.69 4 0.75 3.25 1.09 1.88 1.05 1.00 2.25 *
1 4.88 0.69 2.00 4 0.75 3.50 1.36 2.12 1.32 1.06 2.44 *
114 5.25 0.81 2.50 4 0.75 3.88 1.70 2.50 1.66 1.12 2.62 *
112 6.12 0.88 2.88 4 0.88 4.50 1.95 2.75 1.90 1.25 2.75 *
2 6.50 1.00 3.62 8 0.75 5.00 2.44 3.31 2.38 1.44 2.88 *
212 7.50 1.12 4.12 8 0.88 5.88 2.94 3.94 2.88 1.62 3.12 *
3 8.25 1.25 5.00 8 0.88 6.62 3.57 4.62 3.50 1.81 3.25 *
312 9.00 1.38 5.50 8 1.00 7.25 4.07 5.25 4.00 1.94 3.38 *
4 10.00 1.38 6.19 8 1.00 7.88 4.57 5.75 4.50 2.00 3.50 *
5 11.00 1.50 7.31 8 1.00 9.25 5.66 7.00 5.56 2.12 4.00 *
6 12.50 1.62 8.50 12 1.00 10.62 6.72 8.12 6.63 2.25 4.06 *
8 15.00 1.88 10.62 12 1.12 13.00 8.72 10.25 8.63 2.69 4.62 *
10 17.50 2.12 12.75 16 1.25 15.25 10.88 12.62 10.75 2.88 4.88 *
12 20.50 2.25 15.00 16 1.38 17.75 12.88 14.75 12.75 3.12 5.38 *
14 23.00 2.38 16.25 20 1.38 20.25 14.14 16.75 14.00 3.31 5.88 *
16 25.50 2.50 18.50 20 1.50 22.50 16.16 19.00 16.00 3.69 6.00 *
18 28.00 2.62 21.00 24 1.50 24.75 18.18 21.00 18.00 3.88 6.50 *
20 30.50 2.75 23.12 24 1.62 27.00 20.20 23.12 20.00 4.00 6.62 *
22 33.00 2.88 25.25 24 1.75 29.25 22.22 25.25 22.00 4.25 6.75 *
24 36.00 3.00 27.25 24 1.88 32.00 24.25 27.62 24.00 4.50 6.88 *

ASME B16.5 Class 600 Blind Flange Dimensions

ASME B16.5 Flange

Nominal Size Outside Diameter
(OD)
Min. Thickness
(T)
RF Dia.
(R)
No. of Bolt Holes Diameter of Holes Bolt Circle
(BC)
SO Bore ID
(SB)
Dia. Hub Base
(HB)
Dia. Hub Top
(HT)
SO LTH
(SL)
WN LTH
(WL)
* WN Bore ID
(WB)
12 3.75 0.56 1.38 4 0.63 2.62 0.88 1.50 0.84 0.88 2.06 *
34 4.62 0.62 1.69 4 0.75 3.25 1.09 1.88 1.05 1.00 2.25 *
1 4.88 0.69 2.00 4 0.75 3.50 1.36 2.12 1.32 1.06 2.44 *
114 5.25 0.81 2.50 4 0.75 3.88 1.70 2.50 1.66 1.12 2.62 *
112 6.12 0.88 2.88 4 0.88 4.50 1.95 2.75 1.90 1.25 2.75 *
2 6.50 1.00 3.62 8 0.75 5.00 2.44 3.31 2.38 1.44 2.88 *
212 7.50 1.12 4.12 8 0.88 5.88 2.94 3.94 2.88 1.62 3.12 *
3 8.25 1.25 5.00 8 0.88 6.62 3.57 4.62 3.50 1.81 3.25 *
312 9.00 1.38 5.50 8 1.00 7.25 4.07 5.25 4.00 1.94 3.38 *
4 10.75 1.50 6.19 8 1.00 8.50 4.57 6.00 4.50 2.12 4.00 *
5 13.00 1.75 7.31 8 1.12 10.50 5.66 7.44 5.56 2.38 4.50 *
6 14.00 1.88 8.50 12 1.12 11.50 6.72 8.75 6.63 2.62 4.62 *
8 16.50 2.19 10.62 12 1.25 13.75 8.72 10.75 8.63 3.00 5.25 *
10 20.00 2.50 12.75 16 1.38 17.00 10.88 13.50 10.75 3.38 6.00 *
12 22.00 2.62 15.00 20 1.38 19.25 12.88 15.75 12.75 3.62 6.12 *
14 23.75 2.75 16.25 20 1.50 20.75 14.14 17.00 14.00 3.69 6.50 *
16 27.00 3.00 18.50 20 1.63 23.75 16.16 19.50 16.00 4.19 7.00 *
18 29.25 3.25 21.00 20 1.75 25.75 18.18 21.50 18.00 4.62 7.25 *
20 32.00 3.50 23.00 24 1.75 28.50 20.20 24.00 20.00 5.00 7.50 *
22 34.25 3.75 25.25 24 1.88 30.63 22.22 26.25 22.00 5.25 7.75 *
24 37.00 4.00 27.25 24 2.00 33.00 24.25 28.25 24.00 5.50 8.00 *

ANSI B16.5 Class 900 Flange Dimensions

ASME B16.5 Flange

Nominal Size Outside Diameter
(OD)
Min. Thickness
(T)
RF Dia.
(R)
No. of Bolt Holes Diameter of Holes Bolt Circle
(BC)
SO Bore ID
(SB)
* WN Bore ID
(WB)
Dia. Hub Base
(HB)
Dia. Hub Top
(HT)
SO LTH
(SL)
WN LTH
(WL)
3 9.50 1.50 5.00 8 1.00 7.50 3.57 * 5.00 3.50 2.12 4.00
4 11.50 1.75 6.19 8 1.25 9.25 4.57 * 6.25 4.50 2.75 4.50
5 13.75 2.00 7.31 8 1.38 11.00 5.66 * 7.50 5.56 3.12 5.00
6 15.00 2.19 8.50 12 1.25 12.50 6.72 * 9.25 6.63 3.38 5.50
8 18.50 2.50 10.63 12 1.50 15.50 8.72 * 11.75 8.63 4.00 6.38
10 21.50 2.75 12.75 16 1.50 18.50 10.88 * 14.50 10.75 4.25 7.25
12 24.00 3.12 15.00 20 1.50 21.00 12.88 * 16.50 12.75 4.63 7.88
14 25.25 3.38 16.25 20 1.63 22.00 14.14 * 17.75 14.00 5.12 8.38
16 27.75 3.50 18.50 20 1.75 24.25 16.16 * 20.00 16.00 5.25 8.50
18 31.00 4.00 21.00 20 2.00 27.00 18.18 * 22.25 18.00 6.00 9.00
20 33.75 4.25 23.00 20 2.13 29.50 20.20 * 24.50 20.00 6.25 9.75
24 41.00 5.50 27.25 20 2.63 35.50 24.25 * 29.50 24.00 8.00 11.50

ANSI B16.5 Class 1500 Flange Dimensions

ASME B16.5 Flange

Nominal Size Outside Diameter
(OD)
Min. Thickness
(T)
RF Dia.
(R)
No. of Bolt Holes Diameter of Holes Bolt Circle
(BC)
So Bore ID
(SB)
Dia. Hub Base
(HB)
Dia. Hub Top
(HT)
SO LTH
(SL)
WN LTH
(WL)
* WN Bore ID
(WB)
12 4.75 0.88 1.38 4 0.88 3.25 0.88 1.50 0.84 1.25 2.38 *
34 5.12 1.00 1.69 4 0.88 3.50 1.09 1.75 1.05 1.38 2.75 *
1 5.88 1.12 2.00 4 1.00 4.00 1.36 2.06 1.32 1.62 2.88 *
114 6.25 1.12 2.50 4 1.00 4.38 1.70 2.50 1.66 1.62 2.88 *
112 7.00 1.25 2.88 4 1.12 4.88 1.95 2.75 1.90 1.75 3.25 *
2 8.50 1.50 3.63 8 1.00 6.50 2.44 4.12 2.38 2.25 4.00 *
212 9.62 1.62 4.13 8 1.12 7.50 2.94 4.88 2.88 2.50 4.12 *
3 10.50 1.88 5.00 8 1.25 8.00 5.25 3.50 4.62 *
4 12.25 2.12 6.19 8 1.38 9.50 6.38 4.50 4.88 *
5 14.75 2.88 7.31 8 1.63 11.50 7.75 5.56 6.12 *
6 15.50 3.25 8.50 12 1.50 12.50 9.00 6.63 6.75 *
8 19.00 3.62 10.63 12 1.75 15.50 11.50 8.63 8.38 *
10 23.00 4.25 12.75 12 2.00 19.00 14.50 10.75 10.00 *
12 26.50 4.88 15.00 16 2.12 22.50 17.75 12.75 11.12 *
14 29.50 5.25 16.25 16 2.38 25.00 19.50 14.00 11.75 *
16 32.50 5.75 18.50 16 2.63 27.75 21.75 16.00 12.25 *
18 36.00 6.38 21.00 16 2.88 30.50 23.50 18.00 12.88 *
20 38.75 7.00 23.00 16 3.12 32.75 25.25 20.00 14.00 *
24 46.00 8.00 27.25 16 3.63 39.00 30.00 24.00 16.00 *

ASME B16.5 Class 2500 Flange Dimensions

ASME B16.5 Flange

Nominal Size Outside Diameter
(OD)
Min. Thickness
(T)
RF Dia.
(R)
No. of Bolt Holes Diameter of Holes Bolt Circle
(BC)
Dia. Hub Base
(HB)
Dia. Hub Top
(HT)
SO LTH
(SL)
WN LTH
(WL)
* WN Bore ID
(WB)
12 5.25 1.19 1.38 4 0.88 3.50 1.69 0.84 1.56 2.88 *
34 5.50 1.25 1.69 4 0.88 3.75 2.00 1.05 1.69 3.12 *
1 6.25 1.38 2.00 4 1.00 4.25 2.25 1.32 1.88 3.50 *
114 7.25 1.50 2.50 4 1.12 5.13 2.88 1.66 2.06 3.75 *
112 8.00 1.75 2.88 4 1.25 5.75 3.12 1.90 2.38 4.38 *
2 9.25 2.00 3.63 8 1.12 6.75 3.75 2.38 2.75 5.00 *
212 10.50 2.25 4.13 8 1.25 7.75 4.50 2.88 3.12 5.62 *
3 12.00 2.62 5.00 8 1.38 9.00 5.25 3.50 6.62 *
4 14.00 3.00 6.19 8 1.63 10.75 6.50 4.50 7.50 *
5 16.50 3.62 7.31 8 1.88 12.75 8.00 5.56 9.00 *
6 19.00 4.25 8.50 8 2.12 14.50 9.25 6.63 10.75 *
8 21.75 5.00 10.63 12 2.12 17.25 12.00 8.63 12.50 *
10 26.50 6.50 12.75 12 2.63 21.25 14.75 10.75 16.50 *
12 30.00 7.25 15.00 12 2.88 24.38 17.38 12.75 18.25 *

Pressure Rating of ANSI B16.5 Flange

Temperature
FLANGE TABLE -10°C to 200°C

250°C

300°C

350°C

400°C

425°C

450°C

475°C

6

6

5.5

5

10

10

9

8

7

6

16

16

15

13

11

9

25

25

24

21

17

14

12

9

6

40

40

38

33

28

23

20

15

10

64

64

61

53

44

36

32

24

16

100

100

95

83

70

57

50

37

25

160

160

152

132

112

92

80

60

40