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

BS279 AFLAS-75	N/A 186758	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 12.98 in329.79 mm	N/A 0.004 in0.10 mm	N/A -279	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS278 AFLAS-75	N/A 186759	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 11.98 in304.39 mm	N/A 0.004 in0.10 mm	N/A -278	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS277 AFLAS-75	N/A 186760	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 11.48 in291.69 mm	N/A 0.004 in0.10 mm	N/A -277	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS276 AFLAS-75	N/A 186761	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 10.98 in278.99 mm	N/A 0.004 in0.10 mm	N/A -276	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS275 AFLAS-75	N/A 186762	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 10.48 in266.29 mm	N/A 0.004 in0.10 mm	N/A -275	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture 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.
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.
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.
BS271 AFLAS-75	N/A 186766	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	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.
BS270 AFLAS-75	N/A 186767	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 8.98 in228.19 mm	N/A 0.004 in0.10 mm	N/A -270	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS269 AFLAS-75	N/A 186768	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 8.73 in221.84 mm	N/A 0.004 in0.10 mm	N/A -269	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS268 AFLAS-75	N/A 186769	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 8.48 in215.49 mm	N/A 0.004 in0.10 mm	N/A -268	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS267 AFLAS-75	N/A 186770	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 8.23 in209.14 mm	N/A 0.004 in0.10 mm	N/A -267	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS266 AFLAS-75	N/A 186771	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 7.98 in202.79 mm	N/A 0.004 in0.10 mm	N/A -266	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS265 AFLAS-75	N/A 186772	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 7.73 in196.44 mm	N/A 0.004 in0.10 mm	N/A -265	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS264 AFLAS-75	N/A 186773	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 7.48 in190.09 mm	N/A 0.004 in0.10 mm	N/A -264	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS263 AFLAS-75	N/A 186774	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 7.23 in183.74 mm	N/A 0.004 in0.10 mm	N/A -263	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS262 AFLAS-75	N/A 186775	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 6.98 in177.39 mm	N/A 0.004 in0.10 mm	N/A -262	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS261 AFLAS-75	N/A 186776	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 6.73 in171.04 mm	N/A 0.004 in0.10 mm	N/A -261	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS275 AFLAS-75	N/A 186777	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 6.48 in164.69 mm	N/A 0.004 in0.10 mm	N/A -275	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS259 AFLAS-75	N/A 186778	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 6.23 in158.34 mm	N/A 0.004 in0.10 mm	N/A -259	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS258 AFLAS-75	N/A 186779	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 5.98 in151.99 mm	N/A 0.004 in0.10 mm	N/A -258	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS257 AFLAS-75	N/A 186780	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 5.86 in148.82 mm	N/A 0.004 in0.10 mm	N/A -257	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS256 AFLAS-75	N/A 186781	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 5.73 in145.64 mm	N/A 0.004 in0.10 mm	N/A -256	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS255 AFLAS-75	N/A 186782	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 5.61 in142.47 mm	N/A 0.004 in0.10 mm	N/A -255	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