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

BS452A AFLAS-83	N/A 187433	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 11.73 in297.82 mm	N/A 0.006 in0.15 mm	N/A -452A	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS451A AFLAS-83	N/A 187432	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 11.23 in285.12 mm	N/A 0.006 in0.15 mm	N/A -451A	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS450A AFLAS-83	N/A 187431	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 10.73 in272.42 mm	N/A 0.006 in0.15 mm	N/A -450A	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS449A AFLAS-83	N/A 187430	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 10.23 in259.72 mm	N/A 0.006 in0.15 mm	N/A -449A	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS448A AFLAS-83	N/A 187429	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 9.73 in247.02 mm	N/A 0.006 in0.15 mm	N/A -448A	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS447A AFLAS-83	N/A 187428	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 9.23 in234.32 mm	N/A 0.006 in0.15 mm	N/A -447A	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS446A AFLAS-83	N/A 187427	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 8.73 in221.62 mm	N/A 0.006 in0.15 mm	N/A -446A	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS445A AFLAS-83	N/A 187426	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 8.23 in208.92 mm	N/A 0.006 in0.15 mm	N/A -445A	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS425 AFLAS-83	N/A 187131	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 4.48 in113.67 mm	N/A 0.006 in0.15 mm	N/A -425	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS426 AFLAS-83	N/A 187130	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 4.60 in116.84 mm	N/A 0.006 in0.15 mm	N/A -426	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS427 AFLAS-83	N/A 187129	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 4.73 in120.02 mm	N/A 0.006 in0.15 mm	N/A -427	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS428 AFLAS-83	N/A 187128	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 4.85 in123.19 mm	N/A 0.006 in0.15 mm	N/A -428	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS429 AFLAS-83	N/A 187127	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 4.98 in126.37 mm	N/A 0.006 in0.15 mm	N/A -429	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS430 AFLAS-83	N/A 187126	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 5.10 in129.54 mm	N/A 0.006 in0.15 mm	N/A -430	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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.

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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
6.23
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
10.77
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100.00
100.97
101.19
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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