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

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.
BS44 AFLAS-75	N/A 186920	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 3.74 in94.97 mm	N/A 0.003 in0.08 mm	N/A -044	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS44 AFLAS-83	N/A 187383	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 83	N/A 3.74 in94.97 mm	N/A 0.003 in0.08 mm	N/A -044	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS154 AFLAS-83	N/A 187324	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 83	N/A 3.74 in94.92 mm	N/A 0.003 in0.08 mm	N/A -154	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS154 AFLAS-75	N/A 186861	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 3.74 in94.92 mm	N/A 0.003 in0.08 mm	N/A -154	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS240 AFLAS-75	N/A 186797	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 3.73 in94.84 mm	N/A 0.004 in0.10 mm	N/A -240	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS240 AFLAS-83	N/A 187260	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 3.73 in94.84 mm	N/A 0.004 in0.10 mm	N/A -240	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.
BS536 AFLAS-83	N/A 187076	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 83	N/A 3.61 in91.69 mm	N/A 0.003 in0.08 mm	N/A -536	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS536 AFLAS-75	N/A 186613	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 3.61 in91.69 mm	N/A 0.003 in0.08 mm	N/A -536	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS239 AFLAS-75	N/A 186798	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 3.61 in91.67 mm	N/A 0.004 in0.10 mm	N/A -239	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS239 AFLAS-83	N/A 187261	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 3.61 in91.67 mm	N/A 0.004 in0.10 mm	N/A -239	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.
BS621 AFLAS-83	N/A 187044	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 3.53 in89.69 mm	N/A 0.005 in0.13 mm	N/A -621	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS621 AFLAS-75	N/A 186581	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 3.53 in89.69 mm	N/A 0.005 in0.13 mm	N/A -621	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS43 AFLAS-75	N/A 186921	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 3.49 in88.62 mm	N/A 0.003 in0.08 mm	N/A -043	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS43 AFLAS-83	N/A 187384	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 83	N/A 3.49 in88.62 mm	N/A 0.003 in0.08 mm	N/A -043	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS153 AFLAS-83	N/A 187325	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 83	N/A 3.49 in88.57 mm	N/A 0.003 in0.08 mm	N/A -153	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS153 AFLAS-75	N/A 186862	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 3.49 in88.57 mm	N/A 0.003 in0.08 mm	N/A -153	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS238 AFLAS-75	N/A 186799	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 3.48 in88.49 mm	N/A 0.004 in0.10 mm	N/A -238	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS238 AFLAS-83	N/A 187262	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 3.48 in88.49 mm	N/A 0.004 in0.10 mm	N/A -238	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.

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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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5.38
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
8.74
8.98
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9.48
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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