Threaded Flanges
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About Threaded Flanges
Threaded pipe flanges are the special type of flanges which can be attached to the pipe without welding. Threaded flanges are threaded in the bore which matches an external thread on the pipe. Threaded pipe flanges is just like to slip-on pipe flanges that are used with pipes that have external threads. It is used where small diameter and high pressure is required. These flanges are available in all materials, specifications, sizes and grades.
Threaded pipe flanges are typically provided with a raised face, flat face, or RTJ facing. When a raised face is essential for threaded pipe flanges, the standard height is 1/16" for threaded pipe flanges under 400#. For threaded pipe flanges of 400# and up, the standard threaded pipe flange raised face height is 1/4".
Dimensions of ANSI B16.5 Threaded flange
| Drilling | ||||||||
|---|---|---|---|---|---|---|---|---|
| Nominal Bore Threaded Flanges | Dia.(D) | Thick.(E) | Dia.(F) | Dia.(B) | Height1(H) | Nbr | Holes | Dia.(C) |
|
1/2″
|
90
|
9.6
|
35.05
|
30
|
14
|
4
|
15.87
|
60.3
|
|
3/4″
|
100
|
11.2
|
42.92
|
38
|
14
|
4
|
15.87
|
69.9
|
|
1″
|
110
|
12.7
|
50.80
|
49
|
16
|
4
|
15.87
|
79.4
|
|
1 1/4″
|
115
|
14.3
|
63.50
|
59
|
19
|
4
|
15.87
|
88.9
|
|
1 1/2″
|
125
|
15.9
|
73.15
|
65
|
21
|
4
|
15.87
|
98.4
|
|
2″
|
150
|
17.5
|
91.94
|
78
|
24
|
4
|
19.05
|
120.7
|
|
2 1/2″
|
180
|
20.7
|
104.65
|
90
|
27
|
4
|
19.05
|
139.7
|
|
3″
|
190
|
22.3
|
127.00
|
108
|
29
|
4
|
19.05
|
152.4
|
|
3 1/2″
|
215
|
22.3
|
139.70
|
122
|
30
|
8
|
19.05
|
177.8
|
|
4″
|
230
|
22.3
|
157.22
|
135
|
32
|
8
|
19.05
|
190.5
|
|
5″
|
255
|
22.3
|
185.67
|
164
|
35
|
8
|
22.22
|
215.9
|
|
6″
|
280
|
23.9
|
215.90
|
192
|
38
|
8
|
22.22
|
241.3
|
|
8″
|
345
|
27.0
|
269.75
|
246
|
43
|
8
|
22.22
|
298.5
|
|
10″
|
405
|
28.6
|
323.85
|
305
|
48
|
12
|
25.40
|
362.0
|
|
12″
|
485
|
30.2
|
381.00
|
365
|
54
|
12
|
25.40
|
431.8
|
|
14″
|
535
|
33.4
|
412.75
|
400
|
56
|
12
|
28.57
|
476.3
|
|
16″
|
595
|
35.0
|
469.90
|
457
|
62
|
16
|
28.57
|
539.8
|
|
18″
|
635
|
38.1
|
533.40
|
505
|
67
|
16
|
31.75
|
577.9
|
|
20″
|
700
|
41.3
|
584.20
|
559
|
71
|
20
|
31.75
|
635.0
|
|
24″
|
815
|
46.1
|
692.15
|
663
|
81
|
20
|
34.92
|
749.3
|
Threaded Flanges Material Grades
| Material | Grades |
|---|---|
| Stainless Steel | ASTM A182 F Gr.304, 304L, 304H, 309, 310, 316, 316L, 316Ti, 317L, 321, 347, 347H, 904L |
| Carbon Steel | ASTM / ASME A/SA 105, ASTM A181 LF2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F706 |
| LTCS | ASTM A350 / ASME SA350, LF2, LF3 |
| Alloy Steel | ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91 |
| Duplex Steel | ASTM A182, ASME SA 182 UNS S31803, UNS S32205 (Dual Certified). |
| Super Duplex Steel | ASTM A182, ASME SA 182, UNS S32750, UNS S32760, UNS S32790 |
| High Nickel Alloy | ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020) |
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