BS Aflas O-Rings | OneMonroe

British Standard O-Rings are very similar to Standard O-Rings in the fact that they are both standardized imperically. The British Standard however, incorporates some extended sizes in the 1/4" nominal cross section group for an even broader application range. British Standard O-Rings serve a variety of industries including aerospace, paint, food, and chemical transport.

This elastomer is a copolymer of Tetrafluoroethylene (TFE) and propylene. Its chemical resistance is excellent across a wide range of aggressive media.For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart.

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Item #	IntegrationID	Type	Material	Cross Section Width	Durometer	Inside Diameter	CSW Tolerance	BS Number	Call for a Quote	O-Ring Industries

BS390 AFLAS-83	N/A 187137	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 20.96 in532.26 mm	N/A 0.005 in0.13 mm	N/A -390	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS470 AFLAS-83	N/A 187086	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 20.96 in532.26 mm	N/A 0.006 in0.15 mm	N/A -470	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS471 AFLAS-83	N/A 187085	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 21.96 in557.66 mm	N/A 0.006 in0.15 mm	N/A -471	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS391 AFLAS-83	N/A 187136	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 21.96 in557.66 mm	N/A 0.005 in0.13 mm	N/A -391	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS471 AFLAS-75	N/A 186622	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 21.96 in557.66 mm	N/A 0.006 in0.15 mm	N/A -471	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS391 AFLAS-75	N/A 186673	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 21.96 in557.66 mm	N/A 0.005 in0.13 mm	N/A -391	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS392 AFLAS-75	N/A 186672	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 22.94 in582.68 mm	N/A 0.005 in0.13 mm	N/A -392	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS472 AFLAS-75	N/A 186621	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 22.94 in582.68 mm	N/A 0.006 in0.15 mm	N/A -472	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS392 AFLAS-83	N/A 187135	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 22.94 in582.68 mm	N/A 0.005 in0.13 mm	N/A -392	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS472 AFLAS-83	N/A 187084	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 22.94 in582.68 mm	N/A 0.006 in0.15 mm	N/A -472	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS474 AFLAS-83	N/A 187082	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 24.94 in633.48 mm	N/A 0.006 in0.15 mm	N/A -474	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS394 AFLAS-83	N/A 187133	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 24.94 in633.48 mm	N/A 0.005 in0.13 mm	N/A -394	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS474 AFLAS-75	N/A 186619	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 24.94 in633.48 mm	N/A 0.006 in0.15 mm	N/A -474	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS394 AFLAS-75	N/A 186670	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 24.94 in633.48 mm	N/A 0.005 in0.13 mm	N/A -394	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS395 AFLAS-75	N/A 186669	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 25.94 in658.88 mm	N/A 0.005 in0.13 mm	N/A -395	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS475 AFLAS-75	N/A 186618	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 25.94 in658.88 mm	N/A 0.006 in0.15 mm	N/A -475	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS395 AFLAS-83	N/A 187132	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 25.94 in658.88 mm	N/A 0.005 in0.13 mm	N/A -395	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS475 AFLAS-83	N/A 187081	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 25.94 in658.88 mm	N/A 0.006 in0.15 mm	N/A -475	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS473 AFLAS-83	N/A 187083	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 29.85 in758.08 mm	N/A 0.006 in0.15 mm	N/A -473	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS393 AFLAS-83	N/A 187134	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 29.85 in758.08 mm	N/A 0.005 in0.13 mm	N/A -393	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS473 AFLAS-75	N/A 186620	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 29.85 in758.08 mm	N/A 0.006 in0.15 mm	N/A -473	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS393 AFLAS-75	N/A 186671	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 29.85 in758.08 mm	N/A 0.005 in0.13 mm	N/A -393	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS641 AFLAS-75	N/A 186572	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 3.05 in77.44 mm	N/A 0.003 in0.08 mm	N/A -641	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS641 AFLAS-83	N/A 187035	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 83	N/A 3.05 in77.44 mm	N/A 0.003 in0.08 mm	N/A -641	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS338 AFLAS-83	N/A 187189	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 3.10 in78.74 mm	N/A 0.005 in0.13 mm	N/A -338	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.

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No Preference
0.04
0.05
0.06
0.07
0.08
0.10
0.11
0.13
0.14
0.17
0.18
0.19
0.21
0.23
0.24
0.25
0.27
0.30
0.31
0.34
0.36
0.39
0.41
0.42
0.43
0.44
0.47
0.48
0.49
0.50
0.52
0.54
0.55
0.59
0.60
0.61
0.63
0.66
0.67
0.68
0.69
0.70
0.73
0.74
0.79
0.80
0.81
0.85
0.86
0.88
0.91
0.92
0.93
0.94
0.98
0.99
1.02
1.04
1.05
1.10
1.11
1.16
1.17
1.18
1.23
1.24
1.29
1.30
1.35
1.36
1.42
1.43
1.48
1.49
1.55
1.56
1.60
1.61
1.63
1.67
1.69
1.73
1.74
1.75
1.80
1.81
1.85
1.86
1.88
1.93
1.94
1.98
1.99
10.23
10.48
10.73
10.98
11.23
11.48
11.73
11.98
12.23
12.48
12.73
12.98
13.23
13.48
13.98
14.48
14.98
15.48
15.96
16.46
16.96
17.46
17.96
18.46
18.96
19.46
19.96
2.00
2.05
2.06
2.10
2.11
2.13
2.18
2.19
2.23
2.24
2.25
2.30
2.31
2.35
2.36
2.43
2.44
2.48
2.49
2.50
2.55
2.56
2.60
2.61
2.63
2.68
2.69
2.73
2.74
2.75
2.80
2.81
2.85
2.86
2.88
2.92
2.94
2.95
2.97
2.98
2.99
20.96
21.96
22.94
24.94
25.94
29.85
3.05
3.10
3.11
3.14
3.17
3.23
3.24
3.30
3.35
3.36
3.48
3.49
3.53
3.60
3.61
3.73
3.74
3.85
3.86
3.94
3.98
3.99
4.10
4.11
4.23
4.24
4.31
4.35
4.36
4.48
4.49
4.52
4.60
4.61
4.63
4.73
4.74
4.75
4.85
4.86
4.88
4.91
4.98
4.99
5.00
5.09
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5.34
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5.38
5.47
5.48
5.49
5.50
5.59
5.60
5.61
5.63
5.72
5.73
5.74
5.75
5.84
5.85
5.86
5.88
5.97
5.98
5.99
6.09
6.10
6.13
6.22
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6.24
6.28
6.34
6.35
6.38
6.47
6.48
6.49
6.56
6.60
6.63
6.69
6.72
6.73
6.74
6.84
6.85
6.88
6.98
6.99
7.13
7.23
7.24
7.38
7.48
7.49
7.63
7.73
7.74
7.88
7.98
7.99
8.23
8.24
8.48
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8.73
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8.98
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9.48
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9.73
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9.98

No Preference
1.07
1.24
1.42
1.78
10.46
10.69
10.77
10.82
100.00
100.97
101.19
101.27
101.32
104.14
104.37
104.39
107.32
107.54
107.62
107.67
109.54
11.10
11.91
110.49
110.72
110.74
113.67
113.89
113.97
114.02
114.71
116.84
117.07
117.09
117.48
12.07
12.29
12.37
12.42
12.70
120.02
120.24
120.32
120.37
120.65
123.19
123.42
123.44
123.83
124.61
126.37
126.59
126.67
126.72
127.00
129.41
129.54
129.77
13.11
13.64
13.94
130.18
132.72
132.94
133.02
133.07
133.35
134.54
135.76
135.89
136.12
136.53
138.94
139.07
139.29
139.37
139.70
14.00
142.11
142.24
142.47
142.88
145.29
145.42
145.64
145.72
146.05
148.46
148.59
148.82
149.23
15.09
15.24
15.47
15.54
15.6
15.88
151.64
151.77
151.99
152.07
154.81
154.94
155.58
157.99
158.12
158.34
158.42
159.54
16.81
161.16
161.29
161.93
164.34
164.47
164.69
164.77
166.70
167.64
168.28
17.07
17.12
17.17
17.45
17.86
170.05
170.69
170.82
171.04
171.12
173.86
173.99
174.63
177.17
177.39
177.47
18.42
18.64
18.72
18.77
180.98
183.52
183.74
183.82
187.33
189.87
19.99
190.09
190.17
193.68
196.22
196.44
196.52
2.06
2.54
2.57
2.84
2.90
20.22
20.29
20.35
20.62
200.03
202.57
202.79
202.87
208.92
209.14
209.22
21.59
21.82
21.89
21.95
215.27
215.49
215.57
22.23
221.62
221.84
221.92
227.97
228.19
228.27
23.16
23.39
23.47
23.52
23.80
234.32
234.54
234.62
24.77
24.99
240.67
240.89
240.97
247.02
247.24
247.32
25.07
25.12
25.81
253.37
253.59
259.72
26.34
26.57
26.64
26.70
266.07
266.29
27.94
272.42
278.77
278.99
28.17
28.24
28.30
285.12
29.51
29.74
29.82
29.87
291.47
291.69
297.82
3.18
3.63
3.68
304.17
304.39
31.12
31.34
31.42
31.47
310.52
316.87
32.69
32.92
32.99
323.22
329.57
329.79
33.05
335.92
34.29
34.52
34.59
34.65
342.27
354.97
355.19
36.09
36.17
36.27
367.67
37.47
37.69
37.77
37.82
380.37
380.59
39.34
39.45
39.70
393.07
4.34
4.45
4.47
4.75
40.64
40.87
40.94
405.26
41.00
41.28
417.96
42.52
42.85
43.82
430.66
44.04
44.12
44.17
44.45
443.36
45.69
456.06
46.04
46.99
468.76
47.22
47.29
47.35
47.63
48.90
481.46
49.20
494.16
5.23
5.28
5.94
50.17
50.39
50.47
50.52
50.80
506.86
52.07
52.39
53.34
53.57
53.64
53.70
53.98
532.26
55.25
55.55
557.66
56.52
56.74
56.82
56.87
57.15
58.42
58.74
582.68
59.69
59.92
59.99
6.02
6.07
6.35
6.76
61.60
61.90
62.87
63.09
63.17
63.22
63.50
633.48
64.77
65.1
658.88
66.04
66.27
66.34
66.40
66.68
67.95
68.25
69.22
69.44
69.52
69.57
69.85
7.52
7.59
7.65
7.94
71.12
71.44
72.39
72.62
72.69
72.75
73.03
74.27
74.60
74.61
75.05
75.33
75.57
75.79
75.87
75.92
758.08
77.44
78.74
78.97
78.99
79.78
8.74
80.62
81.92
82.14
82.22
82.27
83.79
85.09
85.32
85.34
88.27
88.49
88.57
88.62
89.69
9.12
9.19
9.25
9.93
91.44
91.67
91.69
94.62
94.84
94.92
94.97
97.79
98.02
98.04