Today the specification standard Api 6a Flanges are commonly used in both, surface drilling as well as production. These Api Threaded Flanges have a long history. In the past, the use of these Api 10000 Psi Flanges have been either discontinued, or obsoleted and many have been replaced by newer, modern configurations.
Originally, all Api Companion Flanges that were related to pipe, became standard as threaded, weld neck and blind configurations. As equipment with integral flanges came to industries such as oilfield, standardization became necessary for the purpose of maintaining functional interchangeability between both the pipes and the Api Flanges Dimensions Weld Neck.
From the late 1930’s, the American Petroleum Institute also referred to as the API had adopted the then ASA B16.5 flanges. For the Api Weld Neck Flanges applications involving pressure classes - 720 psi and 960 psi, the API specified no changes to the ASA B16.5 Standard, using the 300 lb. and 400 lb. flanges respectively. But for the API 6B Integral Flange applications for pressure classes 2000, 3000, and 5000 psi, the API specified an increase in the requirement in terms of the material yield strength for the API 6B Threaded Flange to the respective ASA B16.5 flanges like the 600 lb, 900 lb and 1500 lb.
The main distinguishing point between the original ASA flanges and the Api Adapter Flanges is the method of changing the ASA term "lb." to the API term "SERIES". For instance, the ASA 4" 900 lb. flange has a working pressure of 2160 psi can be compared to API 4" SERIES 900 flanges, which has a working pressure 3000 psi. Dimensionally, both these flanges are the same with different names, material strength, and working pressure.
The first specification, issued by the API is for wellhead flanges as 6B, which was later incorporated into API 6A. The original flange specifies and retains the designation 6B. All API flanges accepted for wellhead use have a Api Ring Joint Flanges. Usually, most API flanges may have Full Face or Raised Face geometry, with either type having a specified ring groove. Most wellhead manufacturers make their 6B flanges full face.
Today, Api 6a Flange Material specifies standard service temperatures of the Api Plate Flanges ranges between -75° F to 250° F. Currently, the API Spec 6A flanges classed as API 6B Instrument Flange by the API . This is because they are easily identified by the fact that they have ring grooves that accept either the R or RX ring gaskets, both of which have identical dimensions with ANSI B16.5 flanges.
Both the Api Series B Flanges , i.e. - 6BX and 6B (welding neck flanges, blind flanges, target flanges and test flanges) are fully conformed to API 6A. The Api Flanges Material consists of modern alloy. Hence, the Api 5l Grade B Flanges are produced steel using advanced manufacturing techniques. The Carbon Steel API 6B Spacer Flange known to be robust in performance and have a high cost.
Since the API 6A TYPE 6B are of the ring joint type, they are not designed for face-to-face make-up. The connection make-up bolting force could react on the raised face of the 6BX Weld Neck Flange, depending on the tolerances, if the gasket has been properly seated. This support prevents damage to the Api Blind Flanges or gasket from excessive bolt torque.
Manifold Pipe Solution Inc. is recognized as one of the leading Api 6a Flanges Manufacturer In India.
Flange Size |
Working Pressure (PSI) |
Outside Diameter |
Number of Bolt Holes |
Diameter of Bolt Holes |
Length of Bolts |
API Ring Gasket |
---|---|---|---|---|---|---|
1-13/16" |
10,000 |
7-3/8" |
8 |
3/4" |
5-1/4" |
BX-151 |
1-13/16" |
15,000 |
8-3/16" |
8 |
7/8" |
6" |
BX-151 |
1-13/16" |
20,000 |
10-1/8" |
8 |
1" |
7-3/4" |
BX-151 |
2-1/16" |
2,000 |
6-1/2" |
8 |
5/8" |
5/8" |
R-23 |
2-1/16" |
3,000/5,000 |
8-1/2" |
8 |
7/8" |
7/8" |
R-24 |
2-1/16" |
10,000 |
7-7/8" |
8 |
3/4" |
3/4" |
BX-152 |
2-1/16" |
15,000 |
8-3/4" |
8 |
7/8" |
7/8" |
BX-152 |
2-1/16" |
20,000 |
11-5/16" |
8 |
1-1/8" |
1-1/8" |
BX-152 |
2-9/16" |
2,000 |
7-1/2" |
8 |
3/4" |
5-1/4" |
R-26 |
2-9/16" |
3,000/5,000 |
9-5/8" |
8 |
1" |
7" |
R-27 |
2-9/16" |
10,000 |
9-1/8" |
8 |
7/8" |
6-1/4" |
BX-153 |
2-9/16" |
15,000 |
10" |
8 |
1" |
7" |
BX-153 |
2-9/16" |
20,000 |
12-13/16" |
8 |
1-1/4" |
9-1/2" |
BX-153 |
3-1/8" |
2,000 |
8-1/4" |
8 |
3/4" |
5-1/2" |
R-31 |
3-1/8" |
3,000 |
9-1/2" |
8 |
7/8" |
6-1/4" |
R-31 |
3-1/8" |
5,000 |
10-1/2" |
8 |
1-1/8" |
7-3/4" |
R-35 |
3-1/16" |
10,000 |
10-5/8" |
8 |
1" |
7-1/4" |
BX-154 |
3-1/16" |
15,000 |
11-5/16" |
8 |
1-1/8" |
8" |
BX-154 |
3-1/16" |
20,000 |
14-1/16" |
8 |
1-3/8" |
10-3/4" |
BX-154 |
4-1/16" |
2,000 |
10-3/4" |
8 |
7/8" |
6-1/4" |
R-37 |
4-1/16" |
3,000 |
11-1/2" |
8 |
1-1/8" |
7-1/2" |
R-37 |
4-1/16" |
5,000 |
12-1/4" |
8 |
1-1/8" |
8-3/8" |
BX-155 |
4-1/16" |
20,000 |
17-9/16" |
8 |
1-3/4" |
12-3/4" |
BX-155 |
5-1/8" |
5,000 |
14-3/4" |
8 |
1-1/2" |
10-3/4" |
R-44 |
7-1/16" |
2,000 |
14" |
12 |
1" |
7-1/2" |
R-45 |
7-1/16" |
3,000 |
15" |
12 |
1-1/8" |
8-1/2" |
R-45 |
7-1/16" |
5,000 |
15-1/2" |
12 |
1-3/8" |
11-1/4" |
R-46 |
7-1/16" |
10,000 |
18-7/8" |
12 |
1-1/2" |
11-3/4" |
BX-156 |
7-1/16" |
15,000 |
19-7/8" |
16 |
1-1/2" |
13" |
BX-156 |
7-1/16" |
20,000 |
24-13/16" |
16 |
2" |
17-3/4" |
BX-156 |
9" |
2,000 |
16-1/2" |
12 |
1-1/8" |
8-1/2" |
R-49 |
9" |
3,000 |
18-1/2" |
12 |
1-3/8" |
9-1/2" |
R-49 |
9" |
5,000" |
19" |
12 |
1-5/8" |
12-1/2" |
R-50 |
9" |
10,000 |
21-3/4" |
16 |
1-1/2" |
13-1/4" |
BX-157 |
9" |
15,000 |
25-1/2" |
16 |
1-7/8" |
16" |
BX-157 |
11" |
2,000 |
20" |
16 |
1-1/4" |
9-1/4" |
R-53 |
11" |
3,000 |
21-1/2" |
16 |
1-3/8" |
10" |
R-53 |
11" |
5,000 |
23" |
12 |
1-7/8" |
14-1/4" |
R-54 |
11" |
10,000 |
25-3/4" |
16 |
1-3/4" |
15-3/8" |
BX-158 |
11" |
15,000 |
32" |
20 |
2" |
19-1/2" |
BX-158 |
13-5/8" |
2,000 |
22" |
20 |
1-1/4" |
9-1/2" |
R-57 |
13-5/8" |
3,000 |
24" |
20 |
1-3/8" |
10-3/4" |
R-57 |
13-5/8" |
5,000 |
26-1/2" |
16 |
1-5/8" |
12-3/4" |
BX-160 |
13-5/8" |
10,000 |
30-1/4" |
20 |
1-7/8" |
17-3/4" |
BX-159 |
13-5/8" |
15,000 |
34-7/8" |
20 |
2-1/4" |
21" |
BX-159 |
16-3/4" |
2,000 |
27" |
20 |
1-1/2" |
10-3/4" |
R-65 |
16-3/4" |
3,000 |
27-3/4" |
20 |
1-5/8" |
12-1/4" |
R-66 |
16-3/4" |
5,000 |
30-3/8" |
16 |
1-78" |
14-3/4" |
BX-162 |
16-3/4" |
10,000 |
34-5/16" |
24 |
1-7/8" |
17-3/4" |
BX-162 |
18-3/4" |
5,000 |
35-5/8" |
20 |
2" |
18" |
BX-163 |
16-3/4" |
10,000 |
40-15/16" |
24 |
2-1/4" |
23" |
BX-164 |
20-3/4" |
3,000 |
33-3/4" |
20 |
2" |
15-1/4" |
R-74 |
21-1/4" |
2,000 |
32" |
24 |
1-5/8" |
12-1/2" |
R-73 |
21-1/4" |
5,000 |
39" |
24 |
2" |
19" |
BX-165 |
21-1/4" |
10,000 |
45" |
24 |
2-1/2" |
24-3/4" |
BX-166 |
26-3/4" |
2,000 |
41" |
20 |
1-3/4" |
14-1/4" |
BX-167 |
21-1/4" |
3,000 |
43-3/8" |
24 |
2" |
17-1/2" |
BX-168 |
Size |
B |
OD |
C |
E1 |
Q |
G |
K |
T |
J1 |
J2 |
J3 |
J4 |
R |
BC |
N |
H |
Ring Number |
1 13/16" |
46.8 |
210 |
3 |
- |
5.56 |
77.77 |
106 |
45.3 |
97.6 |
71.4 |
47.6 |
- |
10 |
160.3 |
8 |
26 |
151 |
2 1/16" |
53.2 |
220 |
3 |
- |
5.95 |
86.23 |
114 |
50.8 |
111.1 |
82.5 |
54 |
- |
10 |
174.6 |
8 |
26 |
152 |
2 9/16" |
65.9 |
255 |
3 |
- |
6.75 |
102.77 |
133 |
57.2 |
128.6 |
100 |
57.1 |
- |
10 |
200 |
8 |
29 |
153 |
3 1/16" |
78.6 |
290 |
3 |
- |
7.54 |
119 |
154 |
64.3 |
154 |
122.2 |
63.5 |
- |
10 |
230.2 |
8 |
32 |
154 |
4 1/16" |
104 |
360 |
3 |
- |
8.33 |
150.62 |
194 |
78.6 |
195.3 |
158.7 |
73 |
- |
10 |
290.5 |
8 |
39 |
155 |
5 1/8" |
131 |
420 |
3 |
9.5 |
9.53 |
176.66 |
225 |
98.5 |
244.5 |
200 |
81.8 |
6.4 |
16 |
342.9 |
12 |
42 |
169 |
7 1/16" |
180.2 |
505 |
6 |
11.1 |
11.11 |
241.83 |
305 |
119.1 |
325.4 |
276.2 |
92.1 |
7.9 |
16 |
428.6 |
16 |
42 |
156 |
9 " |
229.4 |
650 |
6 |
12.7 |
12.7 |
299.06 |
381 |
146.1 |
431.8 |
349.2 |
123.8 |
14.2 |
16 |
552.4 |
16 |
51 |
157 |
11" |
280.2 |
815 |
6 |
14.3 |
14.29 |
357.23 |
454 |
187.4 |
584.2 |
427 |
235.7 |
12.7 |
16 |
711.2 |
20 |
54 |
158 |
13 5/8" |
346.9 |
885 |
6 |
15.9 |
15.88 |
432.64 |
541 |
204.8 |
595.3 |
528.6 |
114.3 |
17.5 |
25 |
771.5 |
20 |
61 |
159 |
18 3/4" |
477 |
1160 |
6 |
18.3 |
18.26 |
577.9 |
722 |
255.6 |
812.8 |
730.2 |
155.6 |
35.1 |
25 |
1016 |
20 |
80 |
164 |
1. RING NUMBER BX, 2. C should be the max value 3. Tolerance and Ring Gasket according to API 6A-20TH
Size |
B |
OD |
C |
K |
P |
E |
T |
Q |
X |
BC |
N |
H |
LN |
HL |
JL |
R/RX |
2 1/16" |
53.2 |
165 |
3 |
108 |
82.55 |
7.9 |
33.4 |
25.4 |
84 |
127 |
8 |
20 |
81 |
60.3 |
53.3 |
23 |
2 9/16" |
65.9 |
190 |
3 |
127 |
101.6 |
7.9 |
36.6 |
28.6 |
100 |
149.2 |
8 |
23 |
88 |
73 |
63.5 |
26 |
3 1/8" |
81.8 |
210 |
3 |
146 |
123.83 |
7.9 |
39.7 |
31.8 |
117 |
168.3 |
8 |
23 |
91 |
88.9 |
78.7 |
31 |
4 1/16" |
108.7 |
275 |
3 |
175 |
149.23 |
7.9 |
46.1 |
38.1 |
152 |
215.9 |
8 |
26 |
110 |
114.3 |
103.1 |
37 |
5 1/8" |
131 |
330 |
3 |
210 |
180.98 |
7.9 |
52.4 |
44.5 |
189 |
266.7 |
8 |
29 |
122 |
141.3 |
122.9 |
41 |
7 1/16" |
181.8 |
355 |
6 |
241 |
211.15 |
7.9 |
55.6 |
47.6 |
222 |
292.1 |
12 |
29 |
126 |
168.3 |
147.1 |
45 |
9" |
229.4 |
420 |
6 |
302 |
269.88 |
7.9 |
63.5 |
55.6 |
273 |
349.3 |
12 |
32 |
141 |
219.1 |
199.1 |
49 |
11" |
280.2 |
510 |
6 |
356 |
323.85 |
7.9 |
71.5 |
63.5 |
343 |
431.8 |
16 |
35 |
160 |
273 |
248.4 |
53 |
13 5/8" |
346.9 |
560 |
6 |
413 |
381 |
7.9 |
74.7 |
66.7 |
400 |
489 |
20 |
35 |
- |
- |
- |
57 |
16 3/4" |
426.2 |
685 |
6 |
508 |
469.9 |
7.9 |
84.2 |
76.2 |
495 |
603.2 |
20 |
42 |
- |
- |
- |
65 |
21 1/4" |
540.5 |
815 |
6 |
635 |
584.2 |
9.7 |
98.5 |
88.9 |
610 |
723.9 |
24 |
45 |
- |
- |
- |
73 |
1. RING NUMBER R or RX, 2. C should be the max value 3. Tolerance and Ring Gasket according to API 6A-20TH
Size |
OD |
C |
E1 |
G |
K |
T |
J1 |
J4 |
R |
BC |
N |
H |
BX |
26 3/4" |
1040 |
6 |
21.4 |
768.33 |
805 |
126.3 |
835.8 |
9.7 |
16 |
952.5 |
20 |
48 |
167 |
30" |
1120 |
6 |
23 |
862.3 |
908 |
134.2 |
931.9 |
17.5 |
16 |
1039.8 |
32 |
45 |
303 |
Size |
B |
OD |
C |
K |
P |
E |
T |
Q |
X |
BC |
N |
H |
LN |
HL |
JL |
R/RX |
2 1/16" |
53.2 |
215 |
3 |
124 |
95.25 |
7.9 |
46.1 |
38.1 |
104.8 |
165.1 |
8 |
26 |
109.6 |
60.3 |
50 |
24 |
2 9/16" |
65.9 |
245 |
3 |
137 |
107.95 |
7.9 |
49.3 |
41.3 |
123.8 |
190.5 |
8 |
29 |
112.7 |
73 |
59.7 |
27 |
3 1/8" |
81.8 |
240 |
3 |
156 |
123.83 |
7.9 |
46.1 |
38.1 |
127 |
190.5 |
8 |
26 |
109.5 |
88.9 |
74.4 |
31 |
4 1/16" |
108.7 |
290 |
3 |
181 |
149.23 |
7.9 |
52.4 |
44.4 |
158.8 |
235 |
8 |
32 |
122.2 |
114.3 |
98 |
37 |
5 1/8" |
131 |
350 |
3 |
216 |
180.98 |
7.9 |
58.8 |
50.8 |
190.5 |
279.4 |
8 |
35 |
134.9 |
141.3 |
122.9 |
41 |
7 1/16" |
181.8 |
380 |
6 |
241 |
211.15 |
7.9 |
63.5 |
55.6 |
235 |
317.5 |
12 |
32 |
147.6 |
168.3 |
147.1 |
45 |
9" |
229.4 |
470 |
6 |
308 |
269.88 |
7.9 |
71.5 |
63.5 |
298.5 |
393.7 |
12 |
39 |
169.9 |
219.1 |
189.7 |
49 |
11" |
280.2 |
545 |
6 |
362 |
323.85 |
7.9 |
77.8 |
69.9 |
368.3 |
469.9 |
16 |
39 |
192.1 |
273 |
237.2 |
53 |
13 5/8" |
346.9 |
610 |
6 |
419 |
381 |
7.9 |
87.4 |
79.4 |
419.1 |
533.4 |
20 |
39 |
- |
- |
- |
57 |
16 3/4" |
426.2 |
705 |
6 |
524 |
469.9 |
11.2 |
100.1 |
88.9 |
508 |
616 |
20 |
45 |
- |
- |
- |
66 |
20 3/4" |
527.8 |
855 |
6 |
648 |
584.2 |
12.7 |
120.7 |
108 |
622.3 |
749.3 |
20 |
54 |
- |
- |
- |
74 |
1. RING NUMBER R or RX, 2. C should be the max value 3. Tolerance and Ring Gasket according to API 6A-20TH
Size |
B |
OD |
C |
K |
P |
E |
T |
Q |
X |
BC |
N |
H |
LN |
HL |
JL |
R/RX |
2 1/16" |
53.2 |
215 |
3 |
124 |
95.25 |
7.9 |
46.1 |
38.1 |
104.8 |
165.1 |
8 |
26 |
109.5 |
60.3 |
43.7 |
24 |
2 9/16" |
65.9 |
245 |
3 |
137 |
107.95 |
7.9 |
49.3 |
41.3 |
123.8 |
190.5 |
8 |
29 |
112.7 |
73 |
54.9 |
27 |
3 1/8" |
81.8 |
265 |
3 |
168 |
136.53 |
7.9 |
55.6 |
47.7 |
133.3 |
203.2 |
8 |
32 |
125.4 |
88.9 |
67.5 |
35 |
4 1/16" |
108.7 |
310 |
3 |
194 |
161.93 |
7.9 |
62 |
54 |
161.9 |
241.3 |
8 |
35 |
131.8 |
114.3 |
88.1 |
39 |
5 1/8" |
131 |
375 |
3 |
229 |
193.68 |
7.9 |
81 |
73.1 |
196.8 |
292.1 |
8 |
42 |
163.5 |
141.3 |
110.3 |
44 |
7 1/16" |
181.8 |
395 |
6 |
248 |
211.15 |
9.7 |
92.1 |
82.6 |
228.6 |
317.5 |
12 |
39 |
181 |
168.3 |
132.6 |
46 |
9" |
229.4 |
485 |
6 |
318 |
269.88 |
11.2 |
103.2 |
92.1 |
292.1 |
393.7 |
12 |
45 |
223.8 |
219.1 |
173.8 |
50 |
11" |
280.2 |
585 |
6 |
371 |
323.85 |
11.2 |
119.1 |
108 |
368.3 |
482.6 |
12 |
51 |
265.1 |
273.1 |
216.7 |
54 |
1. RING NUMBER R or RX, 2. C should be the max value 3. Tolerance and Ring Gasket according to API 6A-20TH
Size |
B |
OD |
C |
E1 |
Q |
G |
K |
T |
J1 |
J2 |
J3 |
J4 |
R |
BC |
N |
H |
BX |
1 13/16" |
46.8 |
185 |
3 |
- |
5.56 |
77.77 |
105 |
42.1 |
88.9 |
65.1 |
48.5 |
- |
10 |
146.1 |
8 |
23 |
151 |
2 1/16" |
53.2 |
200 |
3 |
- |
5.95 |
86.23 |
111 |
44.1 |
100 |
74.7 |
51.6 |
- |
10 |
158.8 |
8 |
23 |
152 |
2 9/16" |
65.9 |
230 |
3 |
- |
6.75 |
102.77 |
132 |
51.2 |
120.7 |
92.1 |
57.2 |
- |
10 |
184.2 |
8 |
26 |
153 |
3 1/16" |
78.6 |
270 |
3 |
- |
7.54 |
119 |
152 |
58.4 |
142.1 |
110.2 |
63.5 |
- |
10 |
215.9 |
8 |
29 |
154 |
4 1/16" |
104 |
315 |
3 |
- |
8.33 |
150.62 |
185 |
70.3 |
182.6 |
146.1 |
73.1 |
- |
10 |
258.8 |
8 |
32 |
155 |
5 1/8" |
131 |
360 |
3 |
9.5 |
9.53 |
176.66 |
221 |
79.4 |
223.8 |
182.6 |
81 |
6.4 |
10 |
300 |
12 |
32 |
169 |
7 1/16" |
180.2 |
480 |
6 |
11.1 |
11.11 |
241.83 |
302 |
103.2 |
301.6 |
254 |
95.3 |
9.7 |
16 |
403.2 |
12 |
42 |
156 |
9 " |
229.4 |
550 |
6 |
12.7 |
12.7 |
299.06 |
359 |
123.9 |
374.7 |
327.1 |
93.7 |
9.7 |
16 |
476.3 |
16 |
42 |
157 |
11" |
280.2 |
655 |
6 |
14.3 |
14.29 |
357.23 |
429 |
141.3 |
450.9 |
400.1 |
103.2 |
14.2 |
16 |
565.2 |
16 |
48 |
158 |
13 5/8" |
346.9 |
770 |
6 |
15.9 |
15.88 |
432.64 |
518 |
168.3 |
552.5 |
495.3 |
114.3 |
17.5 |
16 |
673.1 |
20 |
51 |
159 |
16 3/4" |
426.2 |
870 |
6 |
8.3 |
8.33 |
478.33 |
576 |
168.3 |
655.6 |
601.7 |
76.2 |
30.2 |
19 |
776.3 |
24 |
51 |
162 |
18 3/4" |
477 |
1040 |
6 |
18.3 |
18.26 |
577.9 |
697 |
223.1 |
752.5 |
674.7 |
155.6 |
25.4 |
16 |
925.5 |
24 |
61 |
164 |
21 1/4" |
540.5 |
1145 |
6 |
19.1 |
19.05 |
647.88 |
781 |
241.3 |
847.7 |
762 |
165.1 |
31.8 |
21 |
1022.4 |
24 |
67 |
166 |
1. RING NUMBER BX, 2. C should be the max value 3. Tolerance and Ring Gasket according to API 6A-20TH
Stainless Steel API 650 Flanges Suppliers |
API Flange Distributors |
Super Duplex Steel API 6A Flange |
Copper Nickel API Pipe Flanges |
High Nickel Alloy API 605 Flanges |
API 6A Flange Dimensions |
API Flange Manufacturers |
Hastelloy API 650 Flanges Stockist |
ANSI B16.5 API Flanges |
API 650 Face Flanges Suppliers |
Carbon Steel API 6A Flange |
High Quality API Flanges Manufacturer |
ANSI B16.5 Class 150 API Flange Stockholder |
ANSI B16.5 Class 150 API Flanges |
API 605 Flanges Dimension |
SS API 6A Flange Exporter |
API Socket Weld Flanges |
API SORF Flanges |
API Flat Flanges |
API Weldo / Nipo Flanges |
API SWRF Flanges |
API Ring Type Joint Flanges |
API Lapped Joint Flanges |
API Weld Neck Flanges |
API WNRF Flanges |
API Loose Flanges |
API Weld Neck Flanges Series A or B |
API Long Neck Weld Flanges |
API Blind Flanges |
API Screwed Flanges |
API Expander Flanges |
API High Hub Blinds Flanges |
API Reducing Flanges |
API Groove & Tongue Flanges |
API Square Flanges |
API RTJ Flanges |
API Threaded Flanges |
API Spades Ring Spacers Flanges |
API Slip On Flanges |
API Flanges Facing Type & Finish |
API Forged Flanges |
API Spectacle Blinds Flanges |
API Orifice Flanges |