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

BS274 AFLAS-75	N/A 186763	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 9.98 in253.59 mm	N/A 0.004 in0.10 mm	N/A -274	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS274 AFLAS-83	N/A 187226	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 9.98 in253.59 mm	N/A 0.004 in0.10 mm	N/A -274	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS449 AFLAS-83	N/A 187107	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 9.98 in253.37 mm	N/A 0.006 in0.15 mm	N/A -449	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS449 AFLAS-75	N/A 186644	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 9.98 in253.37 mm	N/A 0.006 in0.15 mm	N/A -449	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS377 AFLAS-75	N/A 186687	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 9.98 in253.37 mm	N/A 0.005 in0.13 mm	N/A -377	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS377 AFLAS-83	N/A 187150	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 9.98 in253.37 mm	N/A 0.005 in0.13 mm	N/A -377	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS178 AFLAS-75	N/A 186837	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 9.74 in247.32 mm	N/A 0.003 in0.08 mm	N/A -178	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS178 AFLAS-83	N/A 187300	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 83	N/A 9.74 in247.32 mm	N/A 0.003 in0.08 mm	N/A -178	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS273 AFLAS-83	N/A 187227	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 9.73 in247.24 mm	N/A 0.004 in0.10 mm	N/A -273	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS273 AFLAS-75	N/A 186764	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 9.73 in247.24 mm	N/A 0.004 in0.10 mm	N/A -273	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS376 AFLAS-75	N/A 186688	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 9.73 in247.02 mm	N/A 0.005 in0.13 mm	N/A -376	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS448A AFLAS-75	N/A 186966	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	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.
BS376 AFLAS-83	N/A 187151	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 9.73 in247.02 mm	N/A 0.005 in0.13 mm	N/A -376	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.
BS177 AFLAS-83	N/A 187301	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 83	N/A 9.49 in240.97 mm	N/A 0.003 in0.08 mm	N/A -177	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS177 AFLAS-75	N/A 186838	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 9.49 in240.97 mm	N/A 0.003 in0.08 mm	N/A -177	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS272 AFLAS-75	N/A 186765	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 9.48 in240.89 mm	N/A 0.004 in0.10 mm	N/A -272	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS272 AFLAS-83	N/A 187228	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 9.48 in240.89 mm	N/A 0.004 in0.10 mm	N/A -272	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS448 AFLAS-83	N/A 187108	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 83	N/A 9.48 in240.67 mm	N/A 0.006 in0.15 mm	N/A -448	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS448 AFLAS-75	N/A 186645	N/A BS Standard O-Ring	N/A Aflas	N/A 0.275 in6.99 mm	N/A 75	N/A 9.48 in240.67 mm	N/A 0.006 in0.15 mm	N/A -448	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS375 AFLAS-75	N/A 186689	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 75	N/A 9.48 in240.67 mm	N/A 0.005 in0.13 mm	N/A -375	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS375 AFLAS-83	N/A 187152	N/A BS Standard O-Ring	N/A Aflas	N/A 0.210 in5.33 mm	N/A 83	N/A 9.48 in240.67 mm	N/A 0.005 in0.13 mm	N/A -375	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS176 AFLAS-75	N/A 186839	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 9.24 in234.62 mm	N/A 0.003 in0.08 mm	N/A -176	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS176 AFLAS-83	N/A 187302	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 83	N/A 9.24 in234.62 mm	N/A 0.003 in0.08 mm	N/A -176	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS271 AFLAS-83	N/A 187229	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 83	N/A 9.23 in234.54 mm	N/A 0.004 in0.10 mm	N/A -271	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
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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
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