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

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.
BS50 AFLAS-75	N/A 186914	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 5.24 in133.07 mm	N/A 0.003 in0.08 mm	N/A -050	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS49 AFLAS-75	N/A 186915	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 4.99 in126.72 mm	N/A 0.003 in0.08 mm	N/A -049	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS48 AFLAS-75	N/A 186916	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 4.74 in120.37 mm	N/A 0.003 in0.08 mm	N/A -048	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS47 AFLAS-75	N/A 186917	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 4.49 in114.02 mm	N/A 0.003 in0.08 mm	N/A -047	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS46 AFLAS-75	N/A 186918	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 4.24 in107.67 mm	N/A 0.003 in0.08 mm	N/A -046	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS45 AFLAS-75	N/A 186919	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 3.99 in101.32 mm	N/A 0.003 in0.08 mm	N/A -045	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS44 AFLAS-75	N/A 186920	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 3.74 in94.97 mm	N/A 0.003 in0.08 mm	N/A -044	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS43 AFLAS-75	N/A 186921	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 3.49 in88.62 mm	N/A 0.003 in0.08 mm	N/A -043	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS42 AFLAS-75	N/A 186922	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 3.24 in82.27 mm	N/A 0.003 in0.08 mm	N/A -042	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS41 AFLAS-75	N/A 186923	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 2.99 in75.92 mm	N/A 0.003 in0.08 mm	N/A -041	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS40 AFLAS-75	N/A 186924	N/A BS Standard O-Ring	N/A Aflas	N/A 0.070 in1.78 mm	N/A 75	N/A 2.86 in72.75 mm	N/A 0.003 in0.08 mm	N/A -040	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