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

BS843 AFLAS-83	N/A 186995	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 2.75 in69.85 mm	N/A 0.004 in0.10 mm	N/A -843	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS843 AFLAS-75	N/A 186532	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.75 in69.85 mm	N/A 0.004 in0.10 mm	N/A -843	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS842 AFLAS-83	N/A 186996	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 2.69 in68.25 mm	N/A 0.004 in0.10 mm	N/A -842	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS842 AFLAS-75	N/A 186533	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.69 in68.25 mm	N/A 0.004 in0.10 mm	N/A -842	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS841 AFLAS-83	N/A 186997	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 2.63 in66.68 mm	N/A 0.004 in0.10 mm	N/A -841	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS841 AFLAS-75	N/A 186534	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.63 in66.68 mm	N/A 0.004 in0.10 mm	N/A -841	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS840 AFLAS-83	N/A 186998	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 2.56 in65.1 mm	N/A 0.004 in0.10 mm	N/A -840	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS840 AFLAS-75	N/A 186535	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.56 in65.1 mm	N/A 0.004 in0.10 mm	N/A -840	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS839 AFLAS-83	N/A 186999	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 2.50 in63.50 mm	N/A 0.004 in0.10 mm	N/A -839	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS839 AFLAS-75	N/A 186536	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.50 in63.50 mm	N/A 0.004 in0.10 mm	N/A -839	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS838 AFLAS-83	N/A 187000	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 2.44 in61.90 mm	N/A 0.004 in0.10 mm	N/A -838	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS838 AFLAS-75	N/A 186537	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.44 in61.90 mm	N/A 0.004 in0.10 mm	N/A -838	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS837 AFLAS-83	N/A 187001	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 2.97 in75.33 mm	N/A 0.004 in0.10 mm	N/A -837	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS837 AFLAS-75	N/A 186538	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.97 in75.33 mm	N/A 0.004 in0.10 mm	N/A -837	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS836 AFLAS-83	N/A 187002	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 2.31 in58.74 mm	N/A 0.004 in0.10 mm	N/A -836	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS836 AFLAS-75	N/A 186539	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.31 in58.74 mm	N/A 0.004 in0.10 mm	N/A -836	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS835 AFLAS-83	N/A 187003	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 2.25 in57.15 mm	N/A 0.004 in0.10 mm	N/A -835	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS835 AFLAS-75	N/A 186540	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.25 in57.15 mm	N/A 0.004 in0.10 mm	N/A -835	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS834 AFLAS-83	N/A 187004	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 2.19 in55.55 mm	N/A 0.004 in0.10 mm	N/A -834	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS834 AFLAS-75	N/A 186541	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.19 in55.55 mm	N/A 0.004 in0.10 mm	N/A -834	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS833 AFLAS-83	N/A 187005	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 2.13 in53.98 mm	N/A 0.004 in0.10 mm	N/A -833	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS833 AFLAS-75	N/A 186542	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.13 in53.98 mm	N/A 0.004 in0.10 mm	N/A -833	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS832 AFLAS-83	N/A 187006	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 2.06 in52.39 mm	N/A 0.004 in0.10 mm	N/A -832	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS832 AFLAS-75	N/A 186543	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.06 in52.39 mm	N/A 0.004 in0.10 mm	N/A -832	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS831 AFLAS-83	N/A 187007	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 2.00 in50.80 mm	N/A 0.004 in0.10 mm	N/A -831	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
5.10
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5.13
5.23
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5.34
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5.36
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
8.49
8.73
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8.98
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9.23
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9.48
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9.73
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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