ASME 16.5 Weld Neck Flanges

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ASME 16.5 Weld Neck Flanges

ASME 16.5 Weld Neck Flanges

Weld Neck Flange is largely manufactured and distributed by Pipe Fittings Suppliers since 1992. Weld Neck Flange is mostly used in process piping, it gives a highest level of joint integrity due to butt welded in pipe. These are mostly used in high level temperature and application. They are very bulky and very costly with respect to other flanges. Largely Weld Beck Flanges are used in many industries like oil, petroleum, gas and other chemical and liquid industries. The dimensions include of class from 150 to 2500. They are covered with ASME B 16.5 which covers pipe flanges and flanged fittings for size NPS ½” to 24” and NPS 26” to 60” should be for ASME B16.47

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These flanges are suitable for extreme environments that have high temperature. The resilience of this type of flanges is achieved when it works against stress with pipe that is welded as it also successfully takes pressure of up to 5,000 psi. Welded Neck Flanges today is widely distributed in many countries for its high quality use in various industries such as petroleum, oil, gas and liquid. UAE, Saudi Arabia, Kuwait, Qatar, Egypt, Turkey, Oman, Africa, Malaysia & many countries in USA & Europe are the main market where our products are exported. Being an ISO 9001, 14001, OHSAS 18001 with PED 97/23/EC approved Supplier & Exporter of Industrial raw materials. Other stainless steel alloy products like Pipe Elbow, Pipe Tee, Pipe Cross, Lap Joints, Butt-Weld Pipes and many more are also available with other types of forged flanges available

Weld Neck Flanges Specification

  • Type: WN Forged Flange , Weld Neck Flanges – WNRF
  • Material:Stainless Steel Weld Neck Flanges :ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904LCarbon Steel Weld Neck Flanges: ASTM / ASME A/SA 105 ASTM / ASME A 350 , ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F70Alloy Steel Weld Neck Flanges: ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91Duplex Steel Weld Neck Flanges: ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61High Nickel Alloy Weld Neck Flanges: Monel 400 & 500, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22, C276, Copper Nickel, Hastelloy, Nickel, Monel, Inconel, Alloy20.
  • Standard: ANSI : ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48 ,JIS,DIN,BS4504,SABS1123,EN1092-1, UNI,AS2129,GOST-12820DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673B.S : BS4504 , BS4504, BS1560, BS10
  • Class: 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.
  • Size: 1/2-78 inch (DN15-DN2000)
  • Pressure: ANSI class 150,300,600,1500,2500, DIN PN6,PN10,PN16,PN25,PN40,PN64,PN100,PN160
  • Packing: No Fumigate or Fumigate Plywood/Wood Pallet or Case
  • Surface Treatment: Anti-rust Oil, Transparent/Yellow/Black Anti-rust Paint,Zinc,Hot dipped Galvanized.
  • E-catalogue: Available , please visit catalogue of flange
  • Usage: Oil Field, Offshore, Water System, Shipbuilding, Natural Gas, Electric Power, Pipe Projects etc.

ASME/ ANSI B16.5 Weld Neck (WN) Pipe Flanges Manufacturing Materials :

Dimensions Base Material Pressure Rating
ASME B16.5 ASTM A182 (Forgings) ASTM A240 (Plate) 150#. 300#. 400#. 600#. 900#. 1500#. 2500#.
API 605 ASTM A182 (Forgings) ASTM A240 (Plate) 150#. 300#. 400#. 600#. 900#. 1500#. 2500#.
ASME B16.47series A & B ASTM A182 (Forgings) ASTM A240 (Plate) 150#. 300#. 400#. 600#. 900#. 1500#. 2500#.
EN1092-1 ASTM A182 (Forgings) PN2.5. PN6. PN10. PN16. PN25. PN40. PN63. PN100. PN160. PN250. PN320. PN400.
BS4504 BS970 (Bar)ASTM A240 (Plate) ASTM A182 (Forgings) PN2.5. PN6. PN10. PN16. PN25. PN40. PN63. PN100. PN160.
BS10 BS970 (Bar)ASTM A240 (Plate) ASTM A182 (Forgings)

Typical Stainless Steel 18/8 Grade Designations:

ASTM
BS
DIN
EURONORM
304
304S15
X5 Cr Ni 18 10
1.4301
304L
304S11
X2 Cr Ni 18 9
1.4307
316
316S31
X5 Cr Ni Mo 17 12 2
1.4401
316L
316S11
X2 Cr Ni Mo 17 13 2
1.4404
321
321S31
X6 Cr Ni 18 10
1.4541
316Ti
320S31
X6 Cr Ni Mo Ti 17 12 2
1.4571
SMO
254SMO
X1 Cr Ni Mo Cu N 20 18 7
1.4547

Technical Information – Specifications, Dimensions Weld Neck Flanges

  • ANSI ASME B16.5 Class 150 Weld Neck Flanges Dimensions
  • ANSI ASME B16.5 Class 300 Weld Neck Flanges Dimensions
  • ANSI ASME B16.5 Class 400 Weld Neck Flanges Dimensions
  • ANSI ASME B16.5 Class 600 Weld Neck Flanges Dimensions
  • ANSI ASME B16.5 Class 900 Weld Neck Flanges Dimensions
  • ANSI ASME B16.5 Class 1500 Weld Neck Flanges Dimensions
  • ANSI ASME B16.5 Class 2500 Weld Neck Flanges Dimensions
  • ANSI/ASME B16.47 Series B Weld Neck Flange 75lb
  • ANSI/ASME B16.47 Series B Weld Neck Flange 150lb
  • ANSI/ASME B16.47 Series B Weld Neck Flange 300lb
  • ANSI/ASME B16.47 Series B Weld Neck Flange 600lb
  • ANSI/ASME B16.47 Series B Weld Neck Flange 400lb
  • ANSI/ASME B16.47 Series B Weld Neck Flange 900lb
  • ANSI/ASME B16.47 Series A (MSS SP44) Weld Neck Flange 150lb
  • ANSI/ASME B16.47 Series A (MSS SP44) Weld Neck Flange 300lb
  • ANSI/ASME B16.47 Series A (MSS SP44) Weld Neck Flange 400lb
  • ANSI/ASME B16.47 Series A (MSS SP44) Weld Neck Flange 600lb
  • ANSI/ASME B16.47 Series A (MSS SP44) Weld Neck Flange 900lb

Dimension of Weld Neck Flanges

Dimension of Weld Neck Flanges


Dimensions of Weld Neck ASME B16.5 – class 150 Lbs

Nominal size
Outside diam. of flange
Thick. of flange
Diam. of raised face
Diam of hub at base
Diam. of hub at point of welding
Length thru hub
No. of holes
Diam. of holes
Diam. of bolts
Diam. of bolt circle
Approx. weight pounds Kg
O
C
R
X
A
Y
in.
1/2″
3.50
0.44
1.38
1.19
0.84
1.88
4
0.62
1/2
2.38
2
mm.
88.9
11.2
35.1
30.2
21.3
47.8
15.7
12.7
60.5
1
in.
3/4″
3.88
0.50
1.69
1.50
1.05
2.06
4
0.62
1/2
2.75
2
mm.
98.6
12.7
42.9
38.1
26.7
52.3
15.7
12.7
69.9
1
in.
1″
4.25
0.56
2.00
1.94
1.32
2.19
4
0.62
1/2
3.12
3
mm.
108.0
14.2
50.8
49.3
33.5
55.6
15.7
12.7
79.2
1
in.
1 1/4″
4.62
0.62
2.50
2.31
1.66
2.25
4
0.62
1/2
3.50
3
mm.
117.3
15.7
63.5
58.7
42.2
57.2
15.7
12.7
88.9
1
in.
1 1/2″
5.00
0.69
2.88
2.56
1.90
2.44
4
0.62
1/2
3.88
4
mm.
127.0
17.5
73.2
65.0
48.3
62.0
15.7
12.7
98.6
2
in.
2″
6.00
0.75
3.62
3.06
2.38
2.50
4
0.75
5/8
4.75
6
mm.
152.4
19.1
91.9
77.7
60.5
63.5
19.1
15.9
120.7
3
in.
2 1/2″
7.00
0.88
4.12
3.56
2.88
2.75
4
0.75
5/8
5.50
8
mm.
177.8
22.4
104.6
90.4
73.2
69.9
19.1
15.9
139.7
4
in.
3″
7.50
0.94
5.00
4.25
3.50
2.75
4
0.75
5/8
6.00
10
mm.
190.5
23.9
127.0
108.0
88.9
69.9
19.1
15.9
152.4
5
in.
3 1/2″
8.50
0.94
5.50
4.81
4.00
2.81
8
0.75
5/8
7.00
12
mm.
215.9
23.9
139.7
122.2
101.6
71.4
19.1
15.9
177.8
5
in.
4″
9.00
0.94
6.19
5.31
4.50
3.00
8
0.75
5/8
7.50
15
mm.
228.6
23.9
157.2
134.9
114.3
76.2
19.1
15.9
190.5
7
in.
5″
10.00
0.94
7.31
6.44
5.56
3.50
8
0.88
3/4
8.50
19
mm.
254.0
23.9
185.7
163.6
141.2
88.9
22.4
19.1
215.9
9
in.
6″
11.00
1.00
8.50
7.56
6.63
3.50
8
0.88
3/4
9.50
24
mm.
279.4
25.4
215.9
192.0
168.4
88.9
22.4
19.1
241.3
11
in.
8″
13.50
1.12
10.62
9.69
8.63
4.00
8
0.88
3/4
11.75
39
mm.
342.9
28.4
269.7
246.1
219.2
101.6
22.4
19.1
298.5
18
in.
10″
16.00
1.19
12.75
12.00
10.75
4.00
12
1.00
7/8
14.25
52
mm.
406.4
30.2
323.9
304.8
273.1
101.6
25.4
22.2
362.0
24
in.
12″
19.00
1.25
15.00
14.38
12.75
4.50
12
1.00
7/8
17.00
80
mm.
482.6
31.8
381.0
365.3
323.9
114.3
25.4
22.2
431.8
36
in.
14″
21.00
1.38
16.25
15.75
14.00
5.00
12
1.12

1
18.75
110
mm.
533.4
35.1
412.8
400.1
355.6
127.0
28.4
25.4
476.3
50
in.
16″
23.50
1.44
18.50
18.00
16.00
5.00
16
1.12

1
21.25
140
mm.
596.9
36.6
469.9
457.2
406.4
127.0
28.4
25.4
539.8
64
in.
18″
25.00
1.56
21.00
19.88
18.00
5.50
16
1.25
1 1/8
22.75
150
mm.
635.0
39.6
533.4
505.0
457.2
139.7
31.8
28.6
577.9
68
in.
20R#8243;
27.50
1.69
23.00
22.00
20.00
5.69
20
1.25
1 1/8
25.00
180
mm.
698.5
42.9
584.2
558.8
508.0
144.5
31.8
28.6
635.0
82
in.
24″
32.00
1.88
27.25
26.12
24.00
6.00
20
1.38
1 1/4
29.50
260
mm.
812.8
47.8
692.2
663.4
609.6
152.4
35.1
31.8
749.3
118

Dimensions of Weld Neck ASME B16.5 – class 300 Lbs
Nominal size
Outside diam. of flange
Thick. of flange
Diam. of raised face
Diam of hub at base
Diam. of hub at point of welding
Length thru hub
No. of holes
Diam. of holes
Diam. of bolts
Diam. of bolt circle
Approx. weight pounds Kg
O
C
R
X
A
Y
in.
1/2″
3.75
0.56
1.38
1.50
0.84
2.06
4
0.62
1/2
2.62
2
mm.
95.3
14.2
35.1
38.1
21.3
52.3
15.7
12.7
66.5
1
in.
3/4″
4.62
0.62
1.69
1.88
1.05
2.25
4
0.75
5/8
3.25
3
mm.
117.3
15.7
42.9
47.8
26.7
57.2
19.1
15.9
82.6
1
in.
1″
4.88
0.69
2.00
2.12
1.32
2.44
4
0.75
5/8
3.50
4
mm.
124.0
17.5
50.8
53.8
33.5
62.0
19.1
15.9
88.9
2
in.
1 1/4″
5.25
0.75
2.50
2.50
1.66
2.56
4
0.75
5/8
3.88
5
mm.
133.4
19.1
63.5
63.5
42.2
65.0
19.1
15.9
98.6
2
in.
1 1/2″
6.12
0.81
2.88
2.75
1.90
2.69
4
0.88
3/4
4.50
7
mm.
155.4
20.6
73.2
69.9
48.3
68.3
22.4
19.1
114.3
3
in.
2″
6.50
0.88
3.62
3.31
2.38
2.75
8
0.75
5/8
5.00
9
mm.
165.1
22.4
91.9
84.1
60.5
69.9
19.1
15.9
127.0
4
in.
2 1/2″
7.50
1.00
4.12
3.94
2.88
3.00
8
0.88
3/4
5.88
12
mm.
190.5
25.4
104.6
100.1
73.2
76.2
22.4
19.1
149.4
5
in.
3″
8.25
1.12
5.00
4.62
3.50
3.12
8
0.88
3/4
6.62
15
mm.
209.6
28.4
127.0
117.3
88.9
79.2
22.4
19.1
168.1
7
in.
3 1/2″
9.00
1.19
5.50
5.25
4.00
3.19
8
0.88
3/4
7.25
18
mm.
228.6
30.2
139.7
133.4
101.6
81.0
22.4
19.1
184.2
8
in.
4″
10.00
1.25
6.19
5.75
4.50
3.38
8
0.88
3/4
7.88
25
mm.
254.0
31.8
157.2
146.1
114.3
85.9
22.4
19.1
200.2
11
in.
5″
11.00
1.38
7.31
7.00
5.56
3.88
8
0.88
3/4
9.25
32
mm.
279.4
35.1
185.7
177.8
141.2
98.6
22.4
19.1
235.0
15
in.
6″
12.50
1.44
8.50
8.12
6.63
3.88
12
0.88
3/4
10.62
42
mm.
317.5
36.6
215.9
206.2
168.4
98.6
22.4
19.1
269.7
19
in.
8″
15.00
1.62
10.62
10.25
8.63
4.38
12
1.00
7/8
13.00
67
mm.
381.0
41.1
269.7
260.4
219.2
111.3
25.4
22.2
330.2
30
in.
10″
17.50
1.88
12.75
12.62
10.75
4.62
16
1.12
1
15.25
91
mm.
444.5
47.8
323.9
320.5
273.1
117.3
28.4
25.4
387.4
41
in.
12″
20.50
2.00
15.00
14.75
12.75
5.12
16
1.25
1 1/8
17.75
140
mm.
520.7
50.8
381.0
374.7
323.9
130.0
31.8
28.6
450.9
64
in.
14″
23.00
2.12
16.25
16.75
14.00
5.62
20
1.25
1 1/8
20.25
180
mm.
584.2
53.8
412.8
425.5
355.6
142.7
31.8
28.6
514.4
82
in.
16″
25.50
2.25
18.50
19.00
16.00
5.75
20
1.38
1 1/4
22.50
250
mm.
647.7
57.2
469.9
482.6
406.4
146.1
35.1
31.8
571.5
113
in.
18″
28.00
2.38
21.00
21.00
18.00
6.25
24
1.38
1 1/4
24.75
320
mm.
711.2
60.5
533.4
533.4
457.2
158.8
35.1
31.8
628.7
145
in.
20″
30.50
2.50
23.00
23.12
20.00
6.38
24
1.38
1 1/4
27.00
400
mm.
774.7
63.5
584.2
587.2
508.0
162.1
35.1
31.8
685.8
181
in.
24″
36.00
2.75
27.25
27.62
24.00
6.62
24
1.62
1 1/2
32.00
580
mm.
914.4
69.9
692.2
701.5
609.6
168.1
41.1
38.1
812.8
263

Dimensions of Weld Neck ASME B16.5 – class 600 Lbs
Nominal size
Outside diam. of flange
Thick. of flange
Diam. of raised face
Diam of hub at base
Diam. of hub at point of welding
Length thru hub
No. of holes
Diam. of holes
Diam. of bolts
Diam. of bolt circle
Approx. weight pounds Kg
O
C
R
X
A
Y
in.
1/2″
3.75
0.56
1.38
1.50
0.84
2.06
4
0.62
1/2
2.62
2
mm.
95.3
14.2
35.1
38.1
21.3
52.3
15.7
12.7
66.5
1
in.
3/4″
4.62
0.62
1.69
1.88
1.05
2.25
4
0.75
5/8
3.25
4
left.
117.3
15.7
42.9
47.8
26.7
57.2
19.1
15.9
82.6
2
in.
1″
4.88
0.69
2.00
2.12
1.32
2.44
4
0.75
5/8
3.50
4
mm.
124.0
17.5
50.8
53.8
33.5
62.0
19.1
15.9
88.9
2
in.
1 1/4″
5.25
0.81
2.50
2.50
1.66
2.62
4
0.75
5/8
3.88
6
mm.
133.4
20.6
63.5
63.5
42.2
66.5
19.1
15.9
98.6
3
left.
1 1/2″
6.12
0.88
2.88
2.75
1.90
2.75
4
0.88
3/4
4.50
8
left.
155.4
22.4
73.2
69.9
48.3
69.9
22.4
19.1
114.3
4
in.
2″
6.50
1.00
3.62
3.31
2.38
2.88
8
0.75
5/8
5.00
12
mm.
165.1
25.4
91.9
84.1
60.5
73.2
19.1
15.9
127.0
5
in.
2 1/2″
7.50
1.12
4.12
3.94
2.88
3.12
8
0.88
3/4
5.88
18
mm.
190.5
28.4
104.6
100.1
73.2
79.2
22.4
19.1
149.4
8
left.
3″
8.25
1.25
5.00
4.62
3.50
3.25
8
0.88
3/4
6.62
23
left.
209.6
31.8
127.0
117.3
88.9
82.6
22.4
19.1
168.1
10
in.
3 1/2″
9.00
1.38
5.50
5.25
4.00
3.38
8
1.00
7/8
7.25
26
mm.
228.6
35.1
139.7
133.4
101.6
85.9
25.4
22.2
184.2
12
in.
4″
10.75
1.50
6.19
6.00
4.50
4.00
8
1.00
7/8
8.50
42
mm.
273.1
38.1
157.2
152.4
114.3
101.6
25.4
22.2
215.9
19
left.
5″
13.00
1.75
7.31
7.44
5.56
4.50
8
1.12

1
10.50
68
left.
330.2
44.5
185.7
189.0
141.2
114.3
28.4
25.4
266.7
31
in.
6″
14.00
1.88
8.50
8.75
6.63
4.62
12
1.12
1
11.50
81
mm.
355.6
47.8
215.9
222.3
168.4
117.3
28.4
25.4
292.1
37
in.
8″
16.50
2.19
10.62
10.75
8.63
5.25
12
1.25
1 1/8
13.75
120
mm.
419.1
55.6
269.7
273.1
219.2
133.4
31.8
28.6
349.3
54
left.
10″
20.00
2.50
12.75
13.50
10.75
6.00
16
1.38
1 1/4
17.00
190
left.
508.0
63.5
323.9
342.9
273.1
152.4
35.1
31.8
431.8
86
in.
12″
22.00
2.62
15.00
15.75
12.75
6.12
20
1.38
1 1/4
19.25
225
mm.
558.8
66.5
381.0
400.1
323.9
155.4
35.1
31.8
489.0
102
in.
14″
23.75
2.75
16.25
17.00
14.00
6.50
20
1.50
1 3/8
20.75
280
mm.
603.3
69.9
412.8
431.8
355.6
165.1
38.1
34.9
527.1
127
left.
16″#8243;
27.00
3.00
18.50
19.50
16.00
7.00
20
1.62
1 1/2
23.75
390
left.
685.8
76.2
469.9
495.3
406.4
177.8
41.1
38.1
603.3
177
in.
18″
29.25
3.25
21.00
21.50
18.00
7.25
20
1.75
1 5/8
25.75
475
mm.
743.0
82.6
533.4
546.1
457.2
184.2
44.5
41.3
654.1
215
in.
20″
32.00
3.50
23.00
24.00
20.00
7.50
24
1.75
1 5/8
28.50
590
mm.
812.8
88.9
584.2
609.6
508.0
190.5
44.5
41.3
723.9
268
in.
24″
37.00
4.00
27.25
28.25
24.00
8.00
24
2.00
1 7/8
33.00
830
left.
939.8
101.6
692.2
717.6
609.6
203.2
50.8
47.6
838.2
376

Dimensions of Weld Neck ASME B16.5 – class 900 Lbs

Nominal size Outside diam. of flange Thick. of flange Diam. of raised face Diam of hub at base Diam. of hub at point of welding Length thru hub No. of holes Diam. of holes Diam. of bolts Diam. of bolt circle Approx. weight pounds Kg
O C R X A Y
in.
1/2″
Sizes 1/2″ thru 2 1/2″ are identical to Class 1500.
mm.
in.
3/4″
mm.
in.
1″
mm.
in.
1 1/4″
mm.
in.
1 1/2″
mm.
in.
2″
mm.
in.
2 1/2″
mm.
in.
3″
9.50
1.50
5.00
5.00
3.50
4.00
8
1.00
7/8
7.50
31
mm.
241.3
38.1
127.0
127.0
88.9
101.6
25.4
22.2
190.5
14
in.
4″
11.50
1.75
6.19
6.25
4.50
4.50
8
1.25
1 1/8
9.25
53
mm.
292.1
44.5
157.2
158.8
114.3
114.3
31.8
28.6
235.0
24
in.
5″
13.75
2.00
7.31
7.50
5.56
5.00
8
1.38
1 1/4
11.00
86
mm.
349.3
50.8
185.7
190.5
141.2
127.0
35.1
31.8
279.4
39
in.
6″
15.00
2.19
8.50
9.25
6.63
5.50
12
1.25
1 1/8
12.50
110
mm.
381.0
55.6
215.9
235.0
168.4
139.7
31.8
28.6
317.5
50
in.
8″
18.50
2.50
10.62
11.75
8.63
6.38
12
1.50
1 3/8
15.50
175
mm.
469.9
63.5
269.7
298.5
219.2
162.1
38.1
34.9
393.7
79
in.
10″
21.50
2.75
12.75
14.50
10.75
7.25
16
1.50
1 3/8
18.50
260
mm.
546.1
69.9
323.9
368.3
273.1
184.2
38.1
34.9
469.9
118
in.
12″
24.00
3.12
15.00
16.50
12.75
7.88
20
1.50
1 3/8
21.00
325
mm.
609.6
79.2
381.0
419.1
323.9
200.2
38.1
34.9
533.4
147
in.
14″
25.25
3.38
16.25
17.75
14.00
8.38
20
1.62
1 1/2
22.00
400
mm.
641.4
85.9
412.8
450.9
355.6
212.9
41.1
38.1
558.8
181
in.
16″
27.75
3.50
18.50
20.00
16.00
8.50
20
1.75
1 5/8
24.25
495
mm.
704.9
88.9
469.9
508.0
406.4
215.9
44.5
41.3
616.0
225
in.
18″
31.00
4.00
21.00
22.25
18.00
9.00
20
2.00
1 7/8
27.00
680
mm.
787.4
101.6
533.4
565.2
457.2
228.6
50.8
47.6
685.8
308
in.
20″
33.75
4.25
23.00
24.50
20.00
9.75
20
2.12
2
29.50
830
mm.
857.3
108.0
584.2
622.3
508.0
247.7
53.8
50.8
749.3
376
in.
24″
41.00
5.50
27.25
29.50
24.00
11.50
20
2.62
2 1/2
35.50
1500
mm.
1041.4
139.7
692.2
749.3
609.6
292.1
66.5
63.5
901.7
680

Dimensions of Weld Neck ASME B16.5 – class 1500 Lbs

Nominal size Outside diam. of flange Thick. of flange Diam. of raised face Diam of hub at base Diam. of hub at point of welding Length thru hub No. of holes Diam. of holes Diam. of bolts Diam. of bolt circle Approx. weight pounds Kg
O C R X A Y
in. 1/2″ 4.75 0.88 1.38 1.50 0.84 2.38 4 0.88 3/4 3.25 5
mm. 120.7 22.4 35.1 38.1 21.3 60.5 22.4 19.1 82.6 2
in. 3/4″ 5.12 1.00 1.69 1.75 1.05 2.75 4 0.88 3/4 3.50 6
mm. 130.0 25.4 42.9 44.5 26.7 69.9 22.4 19.1 88.9 3
in. 1″ 5.88 1.12 2.00 2.06 1.32 2.88 4 1.00 7/8 4.00 9
mm. 149.4 28.4 50.8 52.3 33.5 73.2 25.4 22.2 101.6 4
in. 1 1/4″ 6.25 1.12 2.50 2.50 1.66 2.88 4 1.00 7/8 4.38 10
mm. 158.8 28.4 63.5 63.5 42.2 73.2 25.4 22.2 111.3 5
in. 1 1/2″ 7.00 1.25 2.88 2.75 1.90 3.25 4 1.12 1 4.88 13
mm. 177.8 31.8 73.2 69.9 48.3 82.6 28.4 25.4 124.0 6
in. 2″ 8.50 1.50 3.62 4.12 2.38 4.00 8 1.00 7/8 6.50 25
mm. 215.9 38.1 91.9 104.6 60.5 101.6 25.4 22.2 165.1 11
in. 2 1/2″ 9.62 1.62 4.12 4.88 2.88 4.12 8 1.12 1 7.50 36
mm. 244.3 41.1 104.6 124.0 73.2 104.6 28.4 25.4 190.5 16
in. 3″ 10.50 1.88 5.00 5.25 3.50 4.62 8 1.25 1 1/8 8.00 48
mm. 266.7 47.8 127.0 133.4 88.9 117.3 31.8 28.6 203.2 22
in. 4″ 12.25 2.12 6.19 6.38 4.50 4.88 8 1.38 1 1/4 9.50 73
mm. 311.2 53.8 157.2 162.1 114.3 124.0 35.1 31.8 241.3 33
in. 5″ 14.75 2.88 7.31 7.75 5.56 6.12 8 1.62 1 1/2 11.50 130
mm. 374.7 73.2 185.7 196.9 141.2 155.4 41.1 38.1 292.1 59
in. 6″ 15.50 3.25 8.50 9.00 6.63 6.75 12 1.50 1 3/8 12.50 165
mm. 393.7 82.6 215.9 228.6 168.4 171.5 38.1 34.9 317.5 75
in. 8″ 19.00 3.62 10.62 11.50 8.63 8.38 12 1.75 1 5/8 15.50 275
mm. 482.6 91.9 269.7 292.1 219.2 212.9 44.5 41.3 393.7 125
in. 10″ 23.00 4.25 12.75 14.50 10.75 10.00 12 2.00 1 7/8 19.00 455
mm. 584.2 108.0 323.9 368.3 273.1 254.0 50.8 47.6 482.6 206
in. 12″ 26.50 4.88 15.00 17.75 12.75 11.12 16 2.12 2 22.50 690
mm. 673.1 124.0 381.0 450.9 323.9 282.4 53.8 50.8 571.5 313
in. 14″ 29.50 5.25 16.25 19.50 14.00 11.75 16 2.38 2 1/4 25.00 940
mm. 749.3 133.4 412.8 495.3 355.6 298.5 60.5 57.2 635.0 426
in. 16″ 32.50 5.75 18.50 21.75 16.00 12.25 16 2.62 2 1/2 27.75 1250
mm. 825.5 146.1 469.9 552.5 406.4 311.2 66.5 63.5 704.9 567
in. 18″ 36.00 6.38 21.00 23.50 18.00 12.88 16 2.88 2 3/4 30.50 1625
mm. 914.4 162.1 533.4 596.9 457.2 327.2 73.2 69.9 774.7 737
in. 20″ 38.75 7.00 23.00 25.25 20.00 14.00 16 3.12 3 32.75 2050
mm. 984.3 177.8 584.2 641.4 508.0 355.6 79.2 76.2 831.9 930
in. 24″ 46.00 8.00 27.25 30.00 24.00 16.00 16 3.62 3 1/2 39.00 3325
mm. 1168.4 203.2 692.2 762.0 609.6 406.4 91.9 88.9 990.6 1508

Dimensions of Weld Neck ASME B16.5 – class 2500 Lbs

Nominal size
Outside diam. of flange
Thick. of flange
Diam. of raised face
Diam of hub at base
Diam. of hub at point of welding
Length thru hub
No. of holes
Diam. of holes
Diam. of bolts
Diam. of bolt circle
Approx. weight pounds Kg
O
C
R
X
A
Y
in.
1/2″
5.25
1.19
1.38
1.69
0.84
2.88
4
0.88
3/4
3.50
7
mm.
133.4
30.2
35.1
42.9
21.3
73.2
22.4
19.1
88.9
3
in.
3/4″
5.50
1.25
1.69
2.00
1.05
3.12
4
0.88
3/4
3.75
8
mm.
139.7
31.8
42.9
50.8
26.7
79.2
22.4
19.1
95.3
4
in.
1″
6.25
1.38
2.00
2.25
1.32
3.50
4
1.00
7/8
4.25
12
mm.
158.8
35.1
50.8
57.2
33.5
88.9
25.4
22.2
108.0
5
in.
1 1/4″
7.25
1.50
2.50
2.88
1.66
3.75
4
1.12
right
5.12
17
mm.
184.2
38.1
63.5
73.2
42.2
95.3
28.4
25.4
130.0
8
in.
1 1/2″
8.00
1.75
2.88
3.12
1.90
4.38
4
1.25
1 1/8
5.75
25
mm.
203.2
44.5
73.2
79.2
48.3
111.3
31.8
28.6
146.1
11
in.
2″
9.25
2.00
3.62
3.75
2.38
5.00
8
1.12
right
6.75
42
mm.
235.0
50.8
91.9
95.3
60.5
127.0
28.4
25.4
171.5
19
in.
2 1/2″
10.50
2.25
4.12
4.50
2.88
5.62
8
1.25
1 1/8
7.75
52
mm.
266.7
57.2
104.6
114.3
73.2
142.7
31.8
28.6
196.9
24
in.
3″
12.00
2.62
5.00
5.25
3.50
6.62
8
1.38
1 1/4
9.00
94
mm.
304.8
66.5
127.0
133.4
88.9
168.1
35.1
31.8
228.6
43
in.
4″
14.00
3.00
6.19
6.50
4.50
7.50
8
1.62
1 1/2
10.75
145
mm.
355.6
76.2
157.2
165.1
114.3
190.5
41.1
38.1
273.1
66
in.
5″
16.50
3.62
7.31
8.00
5.56
9.00
8
1.88
1 3/4
12.75
245
mm.
419.1
91.9
185.7
203.2
141.2
228.6
47.8
44.5
323.9
111
in.
6″
19.00
4.25
8.50
9.25
6.63
10.75
8
2.12
right
14.50
380
mm.
482.6
108.0
215.9
235.0
168.4
273.1
53.8
50.8
368.3
172
in.
8″
21.75
5.00
10.62
12.00
8.63
12.50
12
2.12
right
17.25
580
mm.
552.5
127.0
269.7
304.8
219.2
317.5
53.8
50.8
438.2
263
in.
10″
26.50
6.50
12.75
14.75
10.75
16.50
12
2.62
2 1/2
21.25
1075
mm.
673.1
165.1
323.9
374.7
273.1
419.1
66.5
63.5
539.8
488
in.
12″
30.00
7.25
15.00
17.38
12.75
18.25
12
2.88
2 3/4
24.38
1525
mm.
762.0
184.2
381.0
441.5
323.9
463.6
73.2
69.9
619.3
692
Pipe Flanges

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