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

BS339 AFLAS-83	N/A 187188	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 3.23 in81.92 mm	N/A 0.005 in0.13 mm	N/A -339	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS340 AFLAS-75	N/A 186724	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 3.35 in85.09 mm	N/A 0.005 in0.13 mm	N/A -340	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS340 AFLAS-83	N/A 187187	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 3.35 in85.09 mm	N/A 0.005 in0.13 mm	N/A -340	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS341 AFLAS-75	N/A 186723	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 3.48 in88.27 mm	N/A 0.005 in0.13 mm	N/A -341	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS341 AFLAS-83	N/A 187186	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 3.48 in88.27 mm	N/A 0.005 in0.13 mm	N/A -341	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS342 AFLAS-75	N/A 186722	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 3.60 in91.44 mm	N/A 0.005 in0.13 mm	N/A -342	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS342 AFLAS-83	N/A 187185	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 3.60 in91.44 mm	N/A 0.005 in0.13 mm	N/A -342	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS343 AFLAS-75	N/A 186721	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 3.73 in94.62 mm	N/A 0.005 in0.13 mm	N/A -343	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS343 AFLAS-83	N/A 187184	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 3.73 in94.62 mm	N/A 0.005 in0.13 mm	N/A -343	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS344 AFLAS-75	N/A 186720	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 3.85 in97.79 mm	N/A 0.005 in0.13 mm	N/A -344	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS344 AFLAS-83	N/A 187183	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 3.85 in97.79 mm	N/A 0.005 in0.13 mm	N/A -344	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS345 AFLAS-75	N/A 186719	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 3.98 in100.97 mm	N/A 0.005 in0.13 mm	N/A -345	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS345 AFLAS-83	N/A 187182	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 3.98 in100.97 mm	N/A 0.005 in0.13 mm	N/A -345	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS346 AFLAS-75	N/A 186718	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 4.10 in104.14 mm	N/A 0.005 in0.13 mm	N/A -346	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS346 AFLAS-83	N/A 187181	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 4.10 in104.14 mm	N/A 0.005 in0.13 mm	N/A -346	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS347 AFLAS-75	N/A 186717	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 4.23 in107.32 mm	N/A 0.005 in0.13 mm	N/A -347	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS347 AFLAS-83	N/A 187180	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 4.23 in107.32 mm	N/A 0.005 in0.13 mm	N/A -347	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS348 AFLAS-75	N/A 186716	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 4.35 in110.49 mm	N/A 0.005 in0.13 mm	N/A -348	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS348 AFLAS-83	N/A 187179	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 4.35 in110.49 mm	N/A 0.005 in0.13 mm	N/A -348	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS349 AFLAS-75	N/A 186715	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 4.48 in113.67 mm	N/A 0.005 in0.13 mm	N/A -349	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS349 AFLAS-83	N/A 187178	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 4.48 in113.67 mm	N/A 0.005 in0.13 mm	N/A -349	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS350 AFLAS-75	N/A 186714	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 4.60 in116.84 mm	N/A 0.005 in0.13 mm	N/A -350	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS350 AFLAS-83	N/A 187177	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 4.60 in116.84 mm	N/A 0.005 in0.13 mm	N/A -350	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS351 AFLAS-75	N/A 186713	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 4.73 in120.02 mm	N/A 0.005 in0.13 mm	N/A -351	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS351 AFLAS-83	N/A 187176	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 4.73 in120.02 mm	N/A 0.005 in0.13 mm	N/A -351	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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5.38
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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6.28
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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8.98
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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
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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
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