JIS Buna O-Rings | OneMonroe

Japanese Industrial Standard O-Rings are another popular classification system used around the globe. Published by the Japanese Standard Association, these o-rings are also categorized using the metric system. JIS O-Rings are used in many different fields, but typically are implemented in Japan's semiconductor, automotive and machine tool industries. Buna is also known as: Nitrile, NBR, N, Buna-N.

Nitrile, chemically, is a copolymer of butadiene and acrylonitrile. Acrylonitrile content is varied in commercial products from 18% to 48%. As the nitrile content increases, resistance to petroleum base oils and hydrocarbon fuels increases, but low temperature flexibility decreases.

Due to its excellent resistance to petroleum products, and its ability to be compounded for service over a temperature range of -65 to +275°F(-54 to +135°C), nitrile is the most widely used elastomer in the seal industry today.

Inherently nitrile does not possess good resistance to ozone, sunlight or weather, but this can be substantially improved through compounding. 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	ID Tolerance	JIS Number	Call for a Quote	O-Ring Industries

P8 B-90	N/A 178506	N/A JIS Standard O-Ring	N/A Buna	N/A 0.075 in1.90 mm	N/A 90	N/A 7.80 mm0.307 in	N/A 0.003 in0.09 mm	N/A 0.005 in0.12 mm	N/A P-8	N/A	N/A O-rings are used in the military defense and agriculture industries.
P80 B-70	N/A 178507	N/A JIS Standard O-Ring	N/A Buna	N/A 0.224 in5.70 mm	N/A 70	N/A 79.60 mm3.134 in	N/A 0.006 in0.15 mm	N/A 0.016 in0.40 mm	N/A P-80	N/A	N/A O-rings are used in the military defense and agriculture industries.
P80 B-90	N/A 178508	N/A JIS Standard O-Ring	N/A Buna	N/A 0.224 in5.70 mm	N/A 90	N/A 79.60 mm3.134 in	N/A 0.006 in0.15 mm	N/A 0.016 in0.40 mm	N/A P-80	N/A	N/A O-rings are used in the military defense and agriculture industries.
P85 B-70	N/A 178509	N/A JIS Standard O-Ring	N/A Buna	N/A 0.224 in5.70 mm	N/A 70	N/A 84.60 mm3.331 in	N/A 0.006 in0.15 mm	N/A 0.016 in0.40 mm	N/A P-85	N/A	N/A O-rings are used in the military defense and agriculture industries.
P85 B-90	N/A 178510	N/A JIS Standard O-Ring	N/A Buna	N/A 0.224 in5.70 mm	N/A 90	N/A 84.60 mm3.331 in	N/A 0.006 in0.15 mm	N/A 0.016 in0.40 mm	N/A P-85	N/A	N/A O-rings are used in the military defense and agriculture industries.
P9 B-70	N/A 178511	N/A JIS Standard O-Ring	N/A Buna	N/A 0.075 in1.90 mm	N/A 70	N/A 8.80 mm0.346 in	N/A 0.003 in0.09 mm	N/A 0.005 in0.12 mm	N/A P-9	N/A	N/A O-rings are used in the military defense and agriculture industries.
P9 B-90	N/A 178512	N/A JIS Standard O-Ring	N/A Buna	N/A 0.075 in1.90 mm	N/A 90	N/A 8.80 mm0.346 in	N/A 0.003 in0.09 mm	N/A 0.005 in0.12 mm	N/A P-9	N/A	N/A O-rings are used in the military defense and agriculture industries.
P90 B-70	N/A 178513	N/A JIS Standard O-Ring	N/A Buna	N/A 0.224 in5.70 mm	N/A 70	N/A 89.60 mm3.528 in	N/A 0.006 in0.15 mm	N/A 0.016 in0.40 mm	N/A P-90	N/A	N/A O-rings are used in the military defense and agriculture industries.
P90 B-90	N/A 178514	N/A JIS Standard O-Ring	N/A Buna	N/A 0.224 in5.70 mm	N/A 90	N/A 89.60 mm3.528 in	N/A 0.006 in0.15 mm	N/A 0.016 in0.40 mm	N/A P-90	N/A	N/A O-rings are used in the military defense and agriculture industries.
P95 B-70	N/A 178515	N/A JIS Standard O-Ring	N/A Buna	N/A 0.224 in5.70 mm	N/A 70	N/A 94.60 mm3.724 in	N/A 0.006 in0.15 mm	N/A 0.016 in0.40 mm	N/A P-95	N/A	N/A O-rings are used in the military defense and agriculture industries.
P95 B-90	N/A 178516	N/A JIS Standard O-Ring	N/A Buna	N/A 0.224 in5.70 mm	N/A 90	N/A 94.60 mm3.724 in	N/A 0.006 in0.15 mm	N/A 0.016 in0.40 mm	N/A P-95	N/A	N/A O-rings are used in the military defense and agriculture industries.
S10 B-70	N/A 178517	N/A JIS Standard O-Ring	N/A Buna	N/A 0.059 in1.50 mm	N/A 70	N/A 9.50 mm0.374 in	N/A 0.004 in0.08 mm	N/A 0.006 in0.15 mm	N/A S-10	N/A	N/A O-rings are used in the military defense and agriculture industries.
S10 B-90	N/A 178518	N/A JIS Standard O-Ring	N/A Buna	N/A 0.059 in1.50 mm	N/A 90	N/A 9.50 mm0.374 in	N/A 0.004 in0.08 mm	N/A 0.006 in0.15 mm	N/A S-10	N/A	N/A O-rings are used in the military defense and agriculture industries.v
S100 B-70	N/A 178519	N/A JIS Standard O-Ring	N/A Buna	N/A 0.079 in2.00 mm	N/A 70	N/A 99.50 mm3.917 in	N/A 0.004 in0.09 mm	N/A 0.016 in0.40 mm	N/A S-100	N/A	N/A O-rings are used in the military defense and agriculture industries.
S100 B-90	N/A 178520	N/A JIS Standard O-Ring	N/A Buna	N/A 0.079 in2.00 mm	N/A 90	N/A 99.50 mm3.917 in	N/A 0.004 in0.09 mm	N/A 0.016 in0.40 mm	N/A S-100	N/A	N/A O-rings are used in the military defense and agriculture industries.
S105 B-70	N/A 178521	N/A JIS Standard O-Ring	N/A Buna	N/A 0.079 in2.00 mm	N/A 70	N/A 104.50 mm4.114 in	N/A 0.004 in0.09 mm	N/A 0.016 in0.40 mm	N/A S-105	N/A	N/A O-rings are used in the military defense and agriculture industries.
S105 B-90	N/A 178522	N/A JIS Standard O-Ring	N/A Buna	N/A 0.079 in2.00 mm	N/A 90	N/A 104.50 mm4.114 in	N/A 0.004 in0.09 mm	N/A 0.016 in0.40 mm	N/A S-105	N/A	N/A O-rings are used in the military defense and agriculture industries.
S11.2 B-70	N/A 178523	N/A JIS Standard O-Ring	N/A Buna	N/A 0.059 in1.50 mm	N/A 70	N/A 10.70 mm0.421 in	N/A 0.004 in0.08 mm	N/A 0.006 in0.15 mm	N/A S-11.2	N/A	N/A O-rings are used in the military defense and agriculture industries.
S11.2 B-90	N/A 178524	N/A JIS Standard O-Ring	N/A Buna	N/A 0.059 in1.50 mm	N/A 90	N/A 10.70 mm0.421 in	N/A 0.004 in0.08 mm	N/A 0.006 in0.15 mm	N/A S-11.2	N/A	N/A O-rings are used in the military defense and agriculture industries.
S110 B-70	N/A 178525	N/A JIS Standard O-Ring	N/A Buna	N/A 0.079 in2.00 mm	N/A 70	N/A 109.50 mm4.311 in	N/A 0.004 in0.09 mm	N/A 0.016 in0.40 mm	N/A S-110	N/A	N/A O-rings are used in the military defense and agriculture industries.
S110 B-90	N/A 178526	N/A JIS Standard O-Ring	N/A Buna	N/A 0.079 in2.00 mm	N/A 90	N/A 109.50 mm4.311 in	N/A 0.004 in0.09 mm	N/A 0.016 in0.40 mm	N/A S-110	N/A	N/A O-rings are used in the military defense and agriculture industries.
S112 B-70	N/A 178527	N/A JIS Standard O-Ring	N/A Buna	N/A 0.079 in2.00 mm	N/A 70	N/A 111.50 mm4.390 in	N/A 0.004 in0.09 mm	N/A 0.016 in0.40 mm	N/A S-112	N/A	N/A O-rings are used in the military defense and agriculture industries.
S112 B-90	N/A 178528	N/A JIS Standard O-Ring	N/A Buna	N/A 0.079 in2.00 mm	N/A 90	N/A 111.50 mm4.390 in	N/A 0.004 in0.09 mm	N/A 0.016 in0.40 mm	N/A S-112	N/A	N/A O-rings are used in the military defense and agriculture industries.
S115 B-70	N/A 178529	N/A JIS Standard O-Ring	N/A Buna	N/A 0.079 in2.00 mm	N/A 70	N/A 114.50 mm4.508 in	N/A 0.004 in0.09 mm	N/A 0.016 in0.40 mm	N/A S-115	N/A	N/A O-rings are used in the military defense and agriculture industries.
S115 B-90	N/A 178530	N/A JIS Standard O-Ring	N/A Buna	N/A 0.079 in2.00 mm	N/A 90	N/A 114.50 mm4.508 in	N/A 0.004 in0.09 mm	N/A 0.016 in0.40 mm	N/A S-115	N/A	N/A O-rings are used in the military defense and agriculture industries.

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Material

Cross Section Width

Durometer

Inside Diameter

CSW Tolerance

ID Tolerance

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Values

Commitment

No Preference
10.70
10.80
101.60
104.40
104.50
104.60
1044.00
109.40
109.50
109.60
11.00
11.50
11.80
111.50
111.60
114.40
114.50
114.60
119.00
119.40
119.50
119.60
12.00
12.30
124.40
124.50
124.60
129.40
129.50
129.60
13.50
13.80
131.50
131.6
134.40
134.50
134.60
139.40
139.50
139.60
14.5
14.80
144.40
144.50
144.60
148.50
149.30
149.50
149.6
15.50
15.80
154.30
154.50
159.30
159.50
164.30
164.50
169.30
169.50
17.50
17.80
173.00
174.30
174.50
179.30
179.50
184.30
184.50
189.30
189.50
19.50
19.80
194.30
194.50
199.3
199.5
2.50
20.80
204.5
208.5
209.3
209.5
21.50
21.70
21.80
21.90
214.5
219.3
219.5
22.10
222.5
224.5
229.3
229.5
23.5
23.70
234.5
239.3
239.5
24.40
24.50
24.70
244.5
249.3
249.5
25.20
25.50
25.70
254.3
254.5
259.3
259.5
264.5
269.3
269.5
27.50
27.70
272
274.50
279.30
279.50
28.50
28.70
284.50
289.30
289.50
29.20
29.40
29.50
29.70
294.50
299.30
299.50
3.50
3.80
30.70
31.00
31.20
31.50
31.70
314.50
319.50
321.50
33.50
33.70
334.50
339.50
34.40
34.50
34.70
35.00
35.20
35.50
35.70
354.50
359.50
37.50
37.70
374.50
376.00
38.50
38.70
384.50
39.40
39.50
39.70
399.5
4.50
4.80
40.70
41.50
41.70
425.5
43.50
43.70
44.40
44.50
44.70
45.5
45.70
47.50
47.60
47.70
475.00
48.70
49.40
49.50
49.60
49.70
5.50
5.80
51.60
52.50
52.6
524.5
54.40
54.50
54.60
55.50
55.60
57.60
579.00
59.4
59.50
59.6
6.50
6.80
61.60
62.50
62.60
633.5
64.40
64.5
64.60
66.50
66.60
683.00
69.00
69.4
69.5
69.6
7.50
7.80
70.50
70.60
732.50
74.40
74.50
74.60
782.00
79.40
79.50
79.60
8.50
8.80
836.50
84.00
84.40
84.50
84.60
89.40
89.50
89.60
9.50
9.80
94.40
94.50
94.60
940.50
99.00
99.40
99.50
99.60

No Preference
0.098
0.138
0.150
0.177
0.189
0.217
0.228
0.256
0.268
0.295
0.307
0.335
0.346
0.374
0.386
0.421
0.425
0.433
0.453
0.465
0.472
0.484
0.531
0.543
0.571
0.583
0.610
0.622
0.689
0.701
0.768
0.780
0.819
0.846
0.854
0.858
0.862
0.870
0.925
0.933
0.961
0.965
0.972
0.992
1.004
1.012
1.083
1.091
1.122
1.130
1.150
1.157
1.161
1.169
1.209
1.220
1.228
1.240
1.248
1.319
1.327
1.354
1.358
1.366
1.378
1.386
1.398
1.406
1.476
1.484
1.516
1.524
1.551
1.555
1.563
1.602
1.634
1.642
1.713
1.720
1.748
1.752
1.760
1.791
1.799
1.870
1.874
1.878
1.917
1.945
1.949
1.953
1.957
10.012
10.020
10.209
10.217
10.413
10.602
10.610
10.709
10.807
10.996
11.004
11.201
11.390
11.398
11.594
11.783
11.791
12.382
12.579
12.657
13.169
13.366
13.957
14.154
14.744
14.803
15.138
15.728
16.752
18.701
2.031
2.067
2.071
2.142
2.146
2.150
2.185
2.189
2.268
2.339
2.343
2.346
2.425
2.461
2.465
2.535
2.539
2.543
2.618
2.622
2.717
2.732
2.736
2.740
2.776
2.780
2.929
2.933
2.937
20.650
22.795
24.941
26.890
28.839
3.126
3.130
3.134
3.307
3.323
3.327
3.331
3.520
3.524
3.528
3.717
3.720
3.724
3.898
3.913
3.917
3.921
30.787
32.933
37.028
4.000
4.110
4.114
4.118
4.307
4.311
4.315
4.390
4.394
4.504
4.508
4.512
4.685
4.701
4.705
4.709
4.898
4.902
4.906
41.102
5.094
5.098
5.102
5.177
5.181
5.291
5.295
5.299
5.488
5.492
5.496
5.685
5.689
5.693
5.846
5.878
5.886
5.890
6.075
6.083
6.272
6.280
6.469
6.476
6.665
6.673
6.811
6.862
6.870
7.059
7.067
7.256
7.264
7.453
7.461
7.650
7.657
7.846
7.854
8.051
8.209
8.240
8.248
8.445
8.634
8.642
8.760
8.839
9.028
9.035
9.232
9.421
9.429
9.626
9.815
9.823