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

BS254 AFLAS-75	N/A 186783	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 5.48 in139.29 mm	N/A 0.004 in0.10 mm	N/A -254	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS253 AFLAS-75	N/A 186784	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 5.36 in136.12 mm	N/A 0.004 in0.10 mm	N/A -253	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS252 AFLAS-75	N/A 186785	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 5.23 in132.94 mm	N/A 0.004 in0.10 mm	N/A -252	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS251 AFLAS-75	N/A 186786	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 5.11 in129.77 mm	N/A 0.004 in0.10 mm	N/A -251	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS250 AFLAS-75	N/A 186787	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 4.98 in126.59 mm	N/A 0.004 in0.10 mm	N/A -250	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS249 AFLAS-75	N/A 186788	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 4.86 in123.42 mm	N/A 0.004 in0.10 mm	N/A -249	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS248 AFLAS-75	N/A 186789	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 4.73 in120.24 mm	N/A 0.004 in0.10 mm	N/A -248	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS247 AFLAS-75	N/A 186790	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 4.61 in117.07 mm	N/A 0.004 in0.10 mm	N/A -247	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS246 AFLAS-75	N/A 186791	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 4.48 in113.89 mm	N/A 0.004 in0.10 mm	N/A -246	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS245 AFLAS-75	N/A 186792	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 4.36 in110.72 mm	N/A 0.004 in0.10 mm	N/A -245	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS244 AFLAS-75	N/A 186793	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 4.23 in107.54 mm	N/A 0.004 in0.10 mm	N/A -244	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS243 AFLAS-75	N/A 186794	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 4.11 in104.37 mm	N/A 0.004 in0.10 mm	N/A -243	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS242 AFLAS-75	N/A 186795	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 3.98 in101.19 mm	N/A 0.004 in0.10 mm	N/A -242	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS241 AFLAS-75	N/A 186796	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 3.86 in98.02 mm	N/A 0.004 in0.10 mm	N/A -241	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.
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.
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.
BS237 AFLAS-75	N/A 186800	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 3.36 in85.32 mm	N/A 0.004 in0.10 mm	N/A -237	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS236 AFLAS-75	N/A 186801	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 3.23 in82.14 mm	N/A 0.004 in0.10 mm	N/A -236	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS235 AFLAS-75	N/A 186802	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 3.11 in78.97 mm	N/A 0.004 in0.10 mm	N/A -235	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS234 AFLAS-75	N/A 186803	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.98 in75.79 mm	N/A 0.004 in0.10 mm	N/A -234	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS233 AFLAS-75	N/A 186804	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.86 in72.62 mm	N/A 0.004 in0.10 mm	N/A -233	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS232 AFLAS-75	N/A 186805	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.73 in69.44 mm	N/A 0.004 in0.10 mm	N/A -232	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS231 AFLAS-75	N/A 186806	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.61 in66.27 mm	N/A 0.004 in0.10 mm	N/A -231	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS230 AFLAS-75	N/A 186807	N/A BS Standard O-Ring	N/A Aflas	N/A 0.139 in3.53 mm	N/A 75	N/A 2.48 in63.09 mm	N/A 0.004 in0.10 mm	N/A -230	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
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4.99
5.00
5.09
5.10
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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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9.23
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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