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

BS161 AFLAS-75	N/A 186854	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 5.49 in139.37 mm	N/A 0.003 in0.08 mm	N/A -161	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS175 AFLAS-75	N/A 186855	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 5.24 in133.02 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.
BS159 AFLAS-75	N/A 186856	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 4.99 in126.67 mm	N/A 0.003 in0.08 mm	N/A -159	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS158 AFLAS-75	N/A 186857	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 4.74 in120.32 mm	N/A 0.003 in0.08 mm	N/A -158	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS157 AFLAS-75	N/A 186858	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 4.49 in113.97 mm	N/A 0.003 in0.08 mm	N/A -157	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS156 AFLAS-75	N/A 186859	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 4.24 in107.62 mm	N/A 0.003 in0.08 mm	N/A -156	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS155 AFLAS-75	N/A 186860	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 3.99 in101.27 mm	N/A 0.003 in0.08 mm	N/A -155	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS154 AFLAS-75	N/A 186861	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 3.74 in94.92 mm	N/A 0.003 in0.08 mm	N/A -154	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS153 AFLAS-75	N/A 186862	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 3.49 in88.57 mm	N/A 0.003 in0.08 mm	N/A -153	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS152 AFLAS-75	N/A 186863	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 3.24 in82.22 mm	N/A 0.003 in0.08 mm	N/A -152	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS151 AFLAS-75	N/A 186864	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 2.99 in75.87 mm	N/A 0.003 in0.08 mm	N/A -151	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS150 AFLAS-75	N/A 186865	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 2.86 in72.69 mm	N/A 0.003 in0.08 mm	N/A -150	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS149 AFLAS-75	N/A 186866	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 2.80 in71.12 mm	N/A 0.003 in0.08 mm	N/A -149	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS148 AFLAS-75	N/A 186867	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 2.74 in69.52 mm	N/A 0.003 in0.08 mm	N/A -148	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS147 AFLAS-75	N/A 186868	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 2.68 in67.95 mm	N/A 0.003 in0.08 mm	N/A -147	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS146 AFLAS-75	N/A 186869	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 2.61 in66.34 mm	N/A 0.003 in0.08 mm	N/A -146	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS145 AFLAS-75	N/A 186870	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 2.55 in64.77 mm	N/A 0.003 in0.08 mm	N/A -145	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS144 AFLAS-75	N/A 186871	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 2.49 in63.17 mm	N/A 0.003 in0.08 mm	N/A -144	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS143 AFLAS-75	N/A 186872	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 2.43 in61.60 mm	N/A 0.003 in0.08 mm	N/A -143	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS142 AFLAS-75	N/A 186873	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 2.36 in59.99 mm	N/A 0.003 in0.08 mm	N/A -142	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS141 AFLAS-75	N/A 186874	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 2.30 in58.42 mm	N/A 0.003 in0.08 mm	N/A -141	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS140 AFLAS-75	N/A 186875	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 2.24 in56.82 mm	N/A 0.003 in0.08 mm	N/A -140	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS139 AFLAS-75	N/A 186876	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 2.18 in55.25 mm	N/A 0.003 in0.08 mm	N/A -139	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS138 AFLAS-75	N/A 186877	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 2.11 in53.64 mm	N/A 0.003 in0.08 mm	N/A -138	N/A	N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS137 AFLAS-75	N/A 186878	N/A BS Standard O-Ring	N/A Aflas	N/A 0.103 in2.62 mm	N/A 75	N/A 2.05 in52.07 mm	N/A 0.003 in0.08 mm	N/A -137	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