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Welding Neck Flanges

Dimensions Weld Neck Flanges & Stud Bolts ASME B16.5
CL 150 300 600 900 1500 2500
DIA A
30
38
38
38
38
43
DIA D
90
95
95
120
120
135
THK B
9.6
12.7
14.3
22.3
22.3
30.2
11.2
14.3
20.7
28.7
28.7
36.6
DIA G
35.1
35.1
35.1
35.1
35.1
35.1
DIA K
60.3
66.7
66.7
82.6
82.6
88.9
H
46
51
52
60
60
73
47.6
52.6
58.4
66.4
66.4
79.4
NO. L
4
4
4
4
4
4
DIA L
15.9
15.9
15.9
22.2
22.2
22.2
Stud Bolts Diameter x Length
DIA (in)
1/2
1/2
1/2
3/4
3/4
3/4
Len mm
55
65
75
110
110
120
CL 150 300 600 900 1500 2500
DIA A
38
48
48
44
44
51
DIA D
100
115
115
130
130
140
THK B
11.2
14.3
15.9
25.4
25.4
31.8
12.8
15.9
22.3
31.8
31.8
38.2
DIA G
42.9
42.9
42.9
42.9
42.9
42.9
DIA K
69.9
82.6
82.6
88.9
88.9
95
H
51
56
57
70
70
79
52.6
57.6
63.4
76.4
76.4
85.4
NO. L
4
4
4
4
4
4
DIA L
15.9
19.1
19.1
22.2
22.2
22.2
Stud Bolts Diameter x Length
DIA (in)
1/2
5/8
5/8
3/4
3/4
3/4
Len mm
65
75
90
115
115
125
CL 150 300 600 900 1500 2500
DIA A
49.2
54
54
52
52
57
DIA D
110
125
125
150
150
160
THK B
12.7
15.9
17.5
28.6
28.6
35
14.3
17.5
23.9
35
35
41.4
DIA G
50.8
50.8
50.8
50.8
50.8
50.8
DIA K
79.4
88.9
88.9
101.6
101.6
107.4
H
54
60
62
73
73
89
55.6
61.6
68.4
79.4
79.4
95.4
NO. L
4
4
4
4
4
4
DIA L
15.9
19.1
19.1
25.4
25.4
25.4
Stud Bolts Diameter x Length
DIA (in)
1/2
5/8
5/8
7/8
7/8
7/8
Len mm
65
75
90
125
125
140
CL 150 300 600 900 1500 2500
DIA A
30
38
38
38
38
43
DIA D
90
95
95
120
120
135
THK B
9.6
12.7
14.3
22.3
22.3
30.2
11.2
14.3
20.7
28.7
28.7
36.6
DIA G
35.1
35.1
35.1
35.1
35.1
35.1
DIA K
60.3
66.7
66.7
82.6
82.6
88.9
H
46
51
52
60
60
73
47.6
52.6
58.4
66.4
66.4
79.4
NO. L
4
4
4
4
4
4
DIA L
15.9
15.9
15.9
22.2
22.2
22.2
Stud Bolts Diameter x Length
DIA (in)
1/2
1/2
1/2
3/4
3/4
3/4
Len mm
55
65
75
110
110
120
CL 150 300 600 900 1500 2500
DIA A
65
70
70
70
70
79
DIA D
125
155
155
180
180
205
THK B
15.9
19.1
22.3
31.8
31.8
44.5
17.5
20.7
28.7
38.2
38.2
50.9
DIA G
73.2
73.2
73.2
73.2
73.2
73.2
DIA K
98.4
114.3
114.3
123.8
123.8
146
H
60
67
70
83
83
111
61.6
68.6
76.4
89.4
89.4
117.4
NO. L
4
4
4
4
4
4
DIA L
15.9
22.2
22.2
28.6
28.6
31.8
Stud Bolts Diameter x Length
DIA (in)
1/2
3/4
3/4
1
1
1?
Len mm
70
90
110
140
140
170
CL 150 300 600 900 1500 2500
DIA A
78
84
84
105
105
95
DIA D
150
165
165
215
215
235
THK B
17.5
20.7
25.4
38.1
38.1
50.9
19.1
22.3
31.8
44.5
44.5
57.3
DIA G
91.9
91.9
91.9
91.9
91.9
91.9
DIA K
120.7
127
127
165.1
165.1
171.4
H
62
68
73
102
102
127
63.6
69.6
79.4
108.4
108.4
133.4
NO. L
4
8
8
8
8
8
DIA L
19.1
19.1
19.1
25.4
25.4
28.6
Stud Bolts Diameter x Length
DIA (in)
5/8
5/8
5/8
7/8
7/8
1
Len mm
85
90
110
145
145
180
CL 150 300 600 900 1500 2500
DIA A
90
100
100
125
125
114
DIA D
180
190
190
245
245
265
THK B
20.7
23.9
28.6
41.3
41.3
57.2
22.3
25.5
35
47.7
47.7
63.6
DIA G
104.6
104.6
104.6
104.6
104.6
104.6
DIA K
139.7
149.2
149.2
190.5
190.5
197
H
68
75
79
105
105
143
69.6
76.6
85.4
111.4
111.4
149.4
NO. L
4
8
8
8
8
8
DIA L
19.1
22.2
22.2
28.6
28.6
31.8
Stud Bolts Diameter x Length
DIA (in)
5/8
3/4
3/4
1
1
1?
Len mm
90
100
120
160
160
195
CL 150 300 600 900 1500 2500
DIA A
108
115
115
127
125
125
DIA D
190
210
210
240
265
305
THK B
22.3
27
31.8
38.1
47.7
66.7
23.9
28.6
38.2
44.5
54.1
73.1
DIA G
127
127
127
127
127
DIA K
152.4
168.3
168.3
190.5
205
230
H
68
78
83
102
117
168
69.6
79.6
89.4
108.4
123.4
174.4
NO. L
4
8
8
8
8
8
DIA L
19.1
22.2
22.2
25.4
31.8
34.9
Stud Bolts Diameter x Length
DIA (in)
5/8
3/4
3/4
7/8
1?
1ΒΌ
Len mm
90
110
125
145
180
220
CL 150 300 600 900 1500 2500
DIA A
122
135
133
...
...
...
DIA D
215
230
230
...
...
...
THK B
22.3
28.6
35
...
...
...
23.9
30.2
41.4
...
...
...
DIA G
139.7
139.7
139.7
...
...
...
DIA K
177.8
184.2
184.2
...
...
...
H
70
79
86
...
...
...
71.6
80.6
92.4
...
...
...
NO. L
8
8
8
...
...
...
DIA L
19.1
22.2
25.4
...
...
...
Stud Bolts Diameter x Length
DIA (in)
5/8
3/4
7/8
...
...
...
Len mm
90
110
140
...
...
...
CL 150 300 600 900 1500 2500
DIA A
135
146
152
160
162
165
DIA D
230
255
275
290
310
355
THK B
22.3
30.2
38.1
44.5
54
76.2
23.9
31.8
44.5
50.9
60.4
82.6
DIA G
157.2
157.2
157.2
157.2
157.2
157.2
DIA K
190.5
200
215.9
235
240
273
H
75
84
102
114
124
190
76.6
85.6
108.4
120.4
130.4
196.4
NO. L
8
8
8
8
8
8
DIA L
19.1
22.2
25.4
31.8
34.9
41.3
Stud Bolts Diameter x Length
DIA (in)
5/8
3/4
7/8
1?
1ΒΌ
1Β½
Len mm
90
115
145
170
195
255
CL 150 300 600 900 1500 2500
DIA A
164
180
189
190
197
205
DIA D
255
280
330
350
375
420
THK B
22.3
33.4
44.5
50.8
73.1
92.1
23.9
35
50.9
57.2
79.5
98.5
DIA G
185.7
185.7
185.7
185.7
185.7
185.7
DIA K
215.9
235
266.7
279.4
290
323.8
H
87
97
114
127
156
226
88.6
98.6
120.4
133.4
162.4
232.4
NO. L
8
8
8
8
8
8
DIA L
22.2
22.2
28.6
34.9
41.3
47.6
Stud Bolts Diameter x Length
DIA (in)
3/4
3/4
1
1ΒΌ
1Β½
1?
Len mm
90
120
165
190
250
300
CL 150 300 600 900 1500 2500
DIA A
192
206
222
235
230
235
DIA D
280
320
355
380
395
485
THK B
23.9
35
47.7
55.6
82.6
108
25.5
36.6
54.3
62
89
114.4
DIA G
215.9
215.9
215.9
215.9
215.9
215.9
DIA K
241.3
269.9
292.1
317.5
320
368
H
87
97
117
140
171
273
88.6
98.6
123.4
146.4
177.4
279.4
NO. L
8
12
12
12
12
8
DIA L
22.2
22.2
28.6
31.8
38.1
54
Stud Bolts Diameter x Length
DIA (in)
3/4
3/4
1
1?
1?
2
Len mm
100
120
170
190
260
345
CL 150 300 600 900 1500 2500
DIA A
246
260
272
298
290
305
DIA D
345
380
420
470
485
550
THK B
27
39.7
55.6
63.5
92.1
127
28.6
41.3
62
69.9
98.5
133.4
DIA G
269.7
269.7
269.7
269.7
269.7
DIA K
298.5
330.2
349.2
393.7
395
438.1
H
100
110
133
162
213
318
101.6
111.6
139.4
168.4
219.4
324.4
NO. L
8
12
12
12
12
12
DIA L
22.2
25.4
31.8
38.1
44.5
54
Stud Bolts Diameter x Length
DIA (in)
3/4
7/8
1?
1?
1?
2
Len mm
110
140
190
220
290
380
CL 150 300 600 900 1500 2500
DIA A
305
321
345
368
368
375
DIA D
405
445
510
545
585
675
THK B
28.6
46.1
63.5
69.9
108
165
30.2
47.7
69.9
76.3
114.4
171.5
DIA G
323.9
323.9
323.9
323.9
323.9
323.9
DIA K
362
387.4
431.8
469.9
485
539.7
H
100
116
152
184
254
419
101.6
117.6
158.4
190.4
260.4
425.4
NO. L
12
16
16
16
12
12
DIA L
25.4
28.6
34.9
38.1
50.8
66.7
Stud Bolts Diameter x Length
DIA (in)
7/8
1
1ΒΌ
1?
1?
2Β½
Len mm
115
160
215
235
335
490
CL 150 300 600 900 1500 2500
DIA A
365
375
400
420
451
441
DIA D
485
520
560
610
675
760
THK B
30.2
49.3
66.7
79.4
123.9
184.2
31.8
50.9
73.1
85.8
130.3
190.6
DIA G
381
381
381
381
381
381
DIA K
431.8
450.8
489
533.4
571.5
619.1
H
113
129
156
200
283
464
114.6
130.6
162.4
206.4
289.4
470.4
NO. L
12
16
20
20
16
12
DIA L
25.4
31.8
34.9
38.1
54
73
Stud Bolts Diameter x Length
DIA (in)
7/8
1?
1ΒΌ
1?
2
2οΏ½
Len mm
120
170
220
255
375
540
CL 150 300 600 900 1500 2500
DIA A
400
425
432
451
495
...
DIA D
535
585
605
640
750
...
THK B
33.4
52.4
69.9
85.8
133.4
...
35
54
76.3
92.2
139.8
...
DIA G
412.8
412.8
412.8
412.8
412.8
...
DIA K
476.3
514.4
527
558.8
635
...
H
125
141
165
212
298
...
126.6
142.6
171.4
219.4
304.4
...
NO. L
12
20
20
20
16
...
DIA L
28.6
31.8
38.1
41.3
60.3
...
Stud Bolts Diameter x Length
DIA (in)
1
1?
1?
1Β½
2ΒΌ
...
Len mm
135
180
235
275
405
...
CL 150 300 600 900 1500 2500
DIA A
457
485
495
508
550
...
DIA D
595
650
685
705
825
...
THK B
35
55.6
76.2
88.9
146.1
...
36.6
57.2
82.6
95.3
152.5
...
DIA G
469.9
469.9
469.9
469.9
469.9
...
DIA K
539.8
571.5
603.2
616
705
...
H
125
144
178
216
311
...
126.6
145.6
184.4
222.4
317.4
...
NO. L
16
20
20
20
16
...
DIA L
28.6
34.9
41.3
44.5
66.7
...
Stud Bolts Diameter x Length
DIA (in)
1
1ΒΌ
1Β½
1?
2Β½
...
Len mm
135
190
255
285
445
...
CL 150 300 600 900 1500 2500
DIA A
505
533
545
565
597
...
DIA D
635
710
745
785
915
...
THK B
38.1
58.8
82.6
101.6
162
...
39.7
60.4
89
108
168.4
...
DIA G
533.4
533.4
533.4
533.4
533.4
...
DIA K
577.9
628.6
654
685.8
775
...
H
138
157
184
229
327
...
139.6
158.6
190.4
235.4
333.4
...
NO. L
16
24
20
20
16
...
DIA L
31.8
34.9
44.5
50.8
73
...
Stud Bolts Diameter x Length
DIA (in)
1?
1ΒΌ
1?
1?
2οΏ½
...
Len mm
145
195
275
325
495
...
CL 150 300 600 900 1500 2500
DIA A
560
587
610
622
640
...
DIA D
700
775
815
855
985
...
THK B
41.3
62
88.9
108
180
...
42.9
63.6
95.3
114.4
184.2
...
DIA G
584.2
584.2
584.2
584.2
584.2
...
DIA K
635
685.8
723.9
749.3
831.8
...
H
143
160
190
248
356
...
144.6
161.6
196.4
254.4
362.4
...
NO. L
20
24
24
20
16
...
DIA L
31.8
34.9
44.5
54
79.4
...
Stud Bolts Diameter x Length
DIA (in)
1?
1ΒΌ
1?
2
3
...
Len mm
160
205
285
350
540
...
CL 150 300 600 900 1500 2500
DIA A
135
146
152
160
162
165
DIA D
230
255
275
290
310
355
THK B
22.3
30.2
38.1
44.5
54
76.2
23.9
31.8
44.5
50.9
60.4
82.6
DIA G
157.2
157.2
157.2
157.2
157.2
157.2
DIA K
190.5
200
215.9
235
240
273
H
75
84
102
114
124
190
76.6
85.6
108.4
120.4
130.4
196.4
NO. L
8
8
8
8
8
8
DIA L
19.1
22.2
25.4
31.8
34.9
41.3
Stud Bolts Diameter x Length
DIA (in)
5/8
3/4
7/8
1?
1ΒΌ
1Β½
Len mm
90
115
145
170
195
255

Notes:

  • Dimensions are in millimeters unless otherwise indicated.
  • The length of the Stud Bolt does not include the height of the chamfers (points).
  • ID = Depending on the wall thickness of the pipe, must be specified by the purchaser.

DIMENSIONAL TOLERANCES OF WELD NECK FLANGES ASME B16.5

Outside Diameter (Note 1)

≀24
1.6 mm (0.06 in)
>24
βˆ“3.2 mm (βˆ“0.12 in)

Diameter Hub at Base

≀24
1.6 mm (0.06 in)
>24
βˆ“3.2 mm (βˆ“0.12 in)

Inside Diameter

≀10
βˆ“0.8 mm (βˆ“0.03 in)
12 thru 18
1.6 mm (0.06 in)
β‰₯20
+3.2 mm / -1.6 mm
(βˆ“0.12 in / -0.06 in)

Diameter Hub at Point of Welding

≀5
+2.4 mm / -0.8 mm
(βˆ“0.09 in / -0.03 in)
β‰₯6
+4.0 mm / -0.8 mm
(+0.15 in / -0.03 in)

Drilling

Bolt Circle
1.6 mm (0.06 in)
Bolt Hole Spacing
βˆ“0.8 mm (βˆ“0.03 in)

Eccentricity Bolt Circle

≀2Β½
0.8 mm max (0.03 in max)
β‰₯3
1.6 mm max (0.06 in max)

Thickness

≀18
+3.2 mm / -0 (+0.12 in / -0)
β‰₯20
+4.8 mm / -0 (+0.18 in / -0)

Length thru Hub

≀10
1.6 mm (0.06 in)
β‰₯12
βˆ“3.2 mm (βˆ“0.12 in)

Diameter Contact Face

1.6 mm RF (0.06 in)
βˆ“0.8 mm (βˆ“0.03 in)
6.35 mm RF (0.25 in)
βˆ“0.4 mm (βˆ“0.01 in)

Tongue & Groove
βˆ“0.4 mm (βˆ“0.01 in)
Male-Female
βˆ“0.4 mm (βˆ“0.01 in)

1 mm (0.03 in)
2 mm (0.07 in)
6 mm (0.23 in)

(NOTE 1) Tolerances not listed in ASME B16.5-2013

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