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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Inside Diameter (mm)

Item #	IntegrationID	Type	Material	Cross Section Width	Durometer	Inside Diameter	CSW Tolerance	BS Number	Call for a Quote	O-Ring Industries

BS756 AFLAS-75	N/A 186593	N/A BS Standard O-Ring	N/A Aflas	N/A 0.040 in1.02 mm	N/A 75	N/A 0.07 in1.78 mm	N/A 0.003 in0.08 mm	N/A -756	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS562 AFLAS-75	N/A 186594	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 6.84 in173.86 mm	N/A 0.003 in0.08 mm	N/A -562	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS561 AFLAS-75	N/A 186595	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 6.72 in170.69 mm	N/A 0.003 in0.08 mm	N/A -561	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS575 AFLAS-75	N/A 186596	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 6.69 in170.05 mm	N/A 0.003 in0.08 mm	N/A -575	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS559 AFLAS-75	N/A 186597	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 6.47 in164.34 mm	N/A 0.003 in0.08 mm	N/A -559	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS558 AFLAS-75	N/A 186598	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 6.34 in161.16 mm	N/A 0.003 in0.08 mm	N/A -558	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS557 AFLAS-75	N/A 186599	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 6.22 in157.99 mm	N/A 0.003 in0.08 mm	N/A -557	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS556 AFLAS-75	N/A 186600	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 6.09 in154.81 mm	N/A 0.003 in0.08 mm	N/A -556	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS555 AFLAS-75	N/A 186601	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 5.97 in151.64 mm	N/A 0.003 in0.08 mm	N/A -555	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS554 AFLAS-75	N/A 186602	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 5.84 in148.46 mm	N/A 0.003 in0.08 mm	N/A -554	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS553 AFLAS-75	N/A 186603	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 5.72 in145.29 mm	N/A 0.003 in0.08 mm	N/A -553	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS552 AFLAS-75	N/A 186604	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 5.59 in142.11 mm	N/A 0.003 in0.08 mm	N/A -552	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS551 AFLAS-75	N/A 186605	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 5.47 in138.94 mm	N/A 0.003 in0.08 mm	N/A -551	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS550 AFLAS-75	N/A 186606	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 5.34 in135.76 mm	N/A 0.003 in0.08 mm	N/A -550	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS548 AFLAS-75	N/A 186607	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 5.09 in129.41 mm	N/A 0.003 in0.08 mm	N/A -548	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS546 AFLAS-75	N/A 186608	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 4.86 in123.44 mm	N/A 0.003 in0.08 mm	N/A -546	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS544 AFLAS-75	N/A 186609	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 4.61 in117.09 mm	N/A 0.003 in0.08 mm	N/A -544	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture 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.

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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