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

BS443 AFLAS-83	N/A 187113	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 7.48 in189.87 mm	N/A 0.006 in0.15 mm	N/A -443	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS443 AFLAS-75	N/A 186650	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 7.48 in189.87 mm	N/A 0.006 in0.15 mm	N/A -443	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS442 AFLAS-83	N/A 187114	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 7.23 in183.52 mm	N/A 0.006 in0.15 mm	N/A -442	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS442 AFLAS-75	N/A 186651	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 7.23 in183.52 mm	N/A 0.006 in0.15 mm	N/A -442	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS441 AFLAS-83	N/A 187115	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 6.98 in177.17 mm	N/A 0.006 in0.15 mm	N/A -441	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS441 AFLAS-75	N/A 186652	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 6.98 in177.17 mm	N/A 0.006 in0.15 mm	N/A -441	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS440 AFLAS-83	N/A 187116	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 6.73 in170.82 mm	N/A 0.006 in0.15 mm	N/A -440	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS440 AFLAS-75	N/A 186653	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 6.73 in170.82 mm	N/A 0.006 in0.15 mm	N/A -440	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS439 AFLAS-83	N/A 187117	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 6.48 in164.47 mm	N/A 0.006 in0.15 mm	N/A -439	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS439 AFLAS-75	N/A 186654	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 6.48 in164.47 mm	N/A 0.006 in0.15 mm	N/A -439	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS438 AFLAS-83	N/A 187118	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 6.23 in158.12 mm	N/A 0.006 in0.15 mm	N/A -438	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS438 AFLAS-75	N/A 186655	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 6.23 in158.12 mm	N/A 0.006 in0.15 mm	N/A -438	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS437 AFLAS-83	N/A 187119	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 5.98 in151.77 mm	N/A 0.006 in0.15 mm	N/A -437	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS437 AFLAS-75	N/A 186656	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 5.98 in151.77 mm	N/A 0.006 in0.15 mm	N/A -437	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS436 AFLAS-83	N/A 187120	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 5.85 in148.59 mm	N/A 0.006 in0.15 mm	N/A -436	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS436 AFLAS-75	N/A 186657	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 5.85 in148.59 mm	N/A 0.006 in0.15 mm	N/A -436	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS435 AFLAS-83	N/A 187121	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 5.73 in145.42 mm	N/A 0.006 in0.15 mm	N/A -435	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS435 AFLAS-75	N/A 186658	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 5.73 in145.42 mm	N/A 0.006 in0.15 mm	N/A -435	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS434 AFLAS-83	N/A 187122	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 5.60 in142.24 mm	N/A 0.006 in0.15 mm	N/A -434	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS434 AFLAS-75	N/A 186659	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 5.60 in142.24 mm	N/A 0.006 in0.15 mm	N/A -434	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS433 AFLAS-83	N/A 187123	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 5.48 in139.07 mm	N/A 0.006 in0.15 mm	N/A -433	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS433 AFLAS-75	N/A 186660	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 5.48 in139.07 mm	N/A 0.006 in0.15 mm	N/A -433	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS432 AFLAS-83	N/A 187124	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 5.35 in135.89 mm	N/A 0.006 in0.15 mm	N/A -432	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS432 AFLAS-75	N/A 186661	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 5.35 in135.89 mm	N/A 0.006 in0.15 mm	N/A -432	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS431 AFLAS-83	N/A 187125	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 5.23 in132.72 mm	N/A 0.006 in0.15 mm	N/A -431	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
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0.10
0.11
0.13
0.14
0.17
0.18
0.19
0.21
0.23
0.24
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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
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5.00
5.09
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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
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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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No Preference
1.07
1.24
1.42
1.78
10.46
10.69
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100.00
100.97
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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
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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