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

BS542 AFLAS-75	N/A 186610	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 4.36 in110.74 mm	N/A 0.003 in0.08 mm	N/A -542	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS540 AFLAS-75	N/A 186611	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 4.11 in104.39 mm	N/A 0.003 in0.08 mm	N/A -540	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS538 AFLAS-75	N/A 186612	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 3.86 in98.04 mm	N/A 0.003 in0.08 mm	N/A -538	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.
BS534 AFLAS-75	N/A 186614	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 3.36 in85.34 mm	N/A 0.003 in0.08 mm	N/A -534	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS532 AFLAS-75	N/A 186615	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 3.11 in78.99 mm	N/A 0.003 in0.08 mm	N/A -532	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS519 AFLAS-75	N/A 186616	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 1.55 in39.45 mm	N/A 0.003 in0.08 mm	N/A -519	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS517 AFLAS-75	N/A 186617	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 1.43 in36.27 mm	N/A 0.003 in0.08 mm	N/A -517	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.
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.
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.
BS175 AFLAS-75	N/A 186840	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 8.99 in228.27 mm	N/A 0.003 in0.08 mm	N/A -175	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS174 AFLAS-75	N/A 186841	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 8.74 in221.92 mm	N/A 0.003 in0.08 mm	N/A -174	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS173 AFLAS-75	N/A 186842	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 8.49 in215.57 mm	N/A 0.003 in0.08 mm	N/A -173	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS172 AFLAS-75	N/A 186843	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 8.24 in209.22 mm	N/A 0.003 in0.08 mm	N/A -172	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS171 AFLAS-75	N/A 186844	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 7.99 in202.87 mm	N/A 0.003 in0.08 mm	N/A -171	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS170 AFLAS-75	N/A 186845	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 7.74 in196.52 mm	N/A 0.003 in0.08 mm	N/A -170	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS169 AFLAS-75	N/A 186846	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 7.49 in190.17 mm	N/A 0.003 in0.08 mm	N/A -169	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS168 AFLAS-75	N/A 186847	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 7.24 in183.82 mm	N/A 0.003 in0.08 mm	N/A -168	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS167 AFLAS-75	N/A 186848	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 6.99 in177.47 mm	N/A 0.003 in0.08 mm	N/A -167	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS166 AFLAS-75	N/A 186849	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 6.74 in171.12 mm	N/A 0.003 in0.08 mm	N/A -166	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS165 AFLAS-75	N/A 186850	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 6.49 in164.77 mm	N/A 0.003 in0.08 mm	N/A -165	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS164 AFLAS-75	N/A 186851	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 6.24 in158.42 mm	N/A 0.003 in0.08 mm	N/A -164	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS163 AFLAS-75	N/A 186852	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 5.99 in152.07 mm	N/A 0.003 in0.08 mm	N/A -163	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS162 AFLAS-75	N/A 186853	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 5.74 in145.72 mm	N/A 0.003 in0.08 mm	N/A -162	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