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

BS27 AFLAS-75	N/A 186937	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 1.30 in33.05 mm	N/A 0.003 in0.08 mm	N/A -027	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS27 AFLAS-83	N/A 187400	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 83	N/A 1.30 in33.05 mm	N/A 0.003 in0.08 mm	N/A -027	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS28 AFLAS-75	N/A 186936	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 1.36 in34.65 mm	N/A 0.003 in0.08 mm	N/A -028	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS28 AFLAS-83	N/A 187399	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 83	N/A 1.36 in34.65 mm	N/A 0.003 in0.08 mm	N/A -028	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS29 AFLAS-75	N/A 186935	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 1.49 in37.82 mm	N/A 0.003 in0.08 mm	N/A -029	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS29 AFLAS-83	N/A 187398	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 83	N/A 1.49 in37.82 mm	N/A 0.003 in0.08 mm	N/A -029	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS30 AFLAS-75	N/A 186934	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 1.61 in41.00 mm	N/A 0.003 in0.08 mm	N/A -030	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS30 AFLAS-83	N/A 187397	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 83	N/A 1.61 in41.00 mm	N/A 0.003 in0.08 mm	N/A -030	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS31 AFLAS-75	N/A 186933	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 1.74 in44.17 mm	N/A 0.003 in0.08 mm	N/A -031	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS31 AFLAS-83	N/A 187396	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 83	N/A 1.74 in44.17 mm	N/A 0.003 in0.08 mm	N/A -031	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS32 AFLAS-75	N/A 186932	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 1.86 in47.35 mm	N/A 0.003 in0.08 mm	N/A -032	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS32 AFLAS-83	N/A 187395	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 83	N/A 1.86 in47.35 mm	N/A 0.003 in0.08 mm	N/A -032	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS33 AFLAS-75	N/A 186931	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 1.99 in50.52 mm	N/A 0.003 in0.08 mm	N/A -033	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS33 AFLAS-83	N/A 187394	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 83	N/A 1.99 in50.52 mm	N/A 0.003 in0.08 mm	N/A -033	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS34 AFLAS-75	N/A 186930	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 2.11 in53.70 mm	N/A 0.003 in0.08 mm	N/A -034	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS34 AFLAS-83	N/A 187393	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 83	N/A 2.11 in53.70 mm	N/A 0.003 in0.08 mm	N/A -034	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS35 AFLAS-75	N/A 186929	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 2.24 in56.87 mm	N/A 0.003 in0.08 mm	N/A -035	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS35 AFLAS-83	N/A 187392	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 83	N/A 2.24 in56.87 mm	N/A 0.003 in0.08 mm	N/A -035	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS36 AFLAS-75	N/A 186928	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 2.95 in75.05 mm	N/A 0.003 in0.08 mm	N/A -036	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS36 AFLAS-83	N/A 187391	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 83	N/A 2.95 in75.05 mm	N/A 0.003 in0.08 mm	N/A -036	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS37 AFLAS-75	N/A 186927	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 2.49 in63.22 mm	N/A 0.003 in0.08 mm	N/A -037	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS37 AFLAS-83	N/A 187390	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 83	N/A 2.49 in63.22 mm	N/A 0.003 in0.08 mm	N/A -037	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS38 AFLAS-75	N/A 186926	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 2.61 in66.40 mm	N/A 0.003 in0.08 mm	N/A -038	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS38 AFLAS-83	N/A 187389	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 83	N/A 2.61 in66.40 mm	N/A 0.003 in0.08 mm	N/A -038	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS39 AFLAS-75	N/A 186925	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 2.74 in69.57 mm	N/A 0.003 in0.08 mm	N/A -039	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
5.11
5.13
5.23
5.24
5.25
5.30
5.34
5.35
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
8.74
8.98
8.99
9.23
9.24
9.48
9.49
9.73
9.74
9.98

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