JIS Buna O-Rings | OneMonroe

OneMonroe’s JIS BUNA O-Rings offer superior sealing solutions for various industrial applications, ensuring top-notch reliability and performance in demanding environments. Designed to meet the Japanese Industrial Standards (JIS), these O-rings are manufactured from high-quality BUNA-N (Nitrile) material, known for its exceptional resistance to oils, fuels, and various other chemicals. The precise engineering and careful selection of materials make these O-rings ideal for industries requiring secure seals in automotive, marine, hydraulic, and manufacturing sectors. With a focus on both performance and durability, OneMonroe’s JIS BUNA O-Rings are the perfect choice for applications where robust, long-lasting sealing is essential.

At OneMonroe, quality and consistency are paramount in every product we offer. Our JIS BUNA O-Rings undergo stringent testing and quality assurance procedures to ensure they meet both international standards and the high expectations of our customers. The BUNA-N material used in these O-rings is specially selected for its resilience in extreme temperatures and high-pressure conditions, providing dependable performance in both hot and cold environments. Additionally, OneMonroe’s comprehensive inventory allows us to supply various sizes and specifications of JIS BUNA O-Rings, accommodating both common and unique sealing requirements with ease.

Choosing OneMonroe means selecting a trusted partner in sealing solutions, backed by years of expertise and commitment to excellence. Our JIS BUNA O-Rings provide not only the assurance of high-quality materials but also the peace of mind that comes from using a product engineered for precision and durability. With fast delivery options and a responsive customer support team, OneMonroe is dedicated to providing the best in industrial sealing technology to keep your operations running smoothly and efficiently. Trust OneMonroe’s JIS BUNA O-Rings for a sealing solution that delivers reliable results every time.

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	O-Ring Industries

P250 B-70	N/A 178381	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 70	N/A 249.5 mm9.823 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-250	N/A O-rings are used in the military defense and agriculture industries.
P250 B-90	N/A 178382	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 90	N/A 249.5 mm9.823 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-250	N/A O-rings are used in the military defense and agriculture industries.
P255 B-70	N/A 178383	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 70	N/A 254.5 mm10.020 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-255	N/A O-rings are used in the military defense and agriculture industries.
P255 B-90	N/A 178384	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 90	N/A 254.5 mm10.020 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-255	N/A O-rings are used in the military defense and agriculture industries.v
P26 B-70	N/A 178385	N/A JIS Standard O-Ring	N/A Buna	N/A 0.138 in3.50 mm	N/A 70	N/A 25.70 mm1.012 in	N/A 0.004 in0.10 mm	N/A 0.006 in0.15 mm	N/A P-26	N/A O-rings are used in the military defense and agriculture industries.
P26 B-90	N/A 178386	N/A JIS Standard O-Ring	N/A Buna	N/A 0.138 in3.50 mm	N/A 90	N/A 25.70 mm1.012 in	N/A 0.004 in0.10 mm	N/A 0.006 in0.15 mm	N/A P-26	N/A O-rings are used in the military defense and agriculture industries.
P260 B-70	N/A 178387	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 70	N/A 259.5 mm10.217 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-260	N/A O-rings are used in the military defense and agriculture industries.
P260 B-90	N/A 178388	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 90	N/A 259.5 mm10.217 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-260	N/A O-rings are used in the military defense and agriculture industries.
P265 B-70	N/A 178389	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 70	N/A 264.5 mm10.413 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-265	N/A O-rings are used in the military defense and agriculture industries.
P265 B-90	N/A 178390	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 90	N/A 264.5 mm10.413 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-265	N/A O-rings are used in the military defense and agriculture industries.
P270 B-70	N/A 178391	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 70	N/A 269.5 mm10.610 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-270	N/A O-rings are used in the military defense and agriculture industries.
P270 B-90	N/A 178392	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 90	N/A 269.5 mm10.610 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-270	N/A O-rings are used in the military defense and agriculture industries.
P275 B-70	N/A 178393	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 70	N/A 274.50 mm10.807 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-275	N/A O-rings are used in the military defense and agriculture industries.
P275 B-90	N/A 178394	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 90	N/A 274.50 mm10.807 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-275	N/A O-rings are used in the military defense and agriculture industries.
P28 B-70	N/A 178395	N/A JIS Standard O-Ring	N/A Buna	N/A 0.138 in3.50 mm	N/A 70	N/A 27.70 mm1.091 in	N/A 0.004 in0.10 mm	N/A 0.006 in0.15 mm	N/A P-28	N/A O-rings are used in the military defense and agriculture industries.v
P28 B-90	N/A 178396	N/A JIS Standard O-Ring	N/A Buna	N/A 0.138 in3.50 mm	N/A 90	N/A 27.70 mm1.091 in	N/A 0.004 in0.10 mm	N/A 0.006 in0.15 mm	N/A P-28	N/A O-rings are used in the military defense and agriculture industries.
P280 B-70	N/A 178397	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 70	N/A 279.50 mm11.004 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-280	N/A O-rings are used in the military defense and agriculture industries.
P280 B-90	N/A 178398	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 90	N/A 279.50 mm11.004 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-280	N/A O-rings are used in the military defense and agriculture industries.
P285 B-70	N/A 178399	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 70	N/A 284.50 mm11.201 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-285	N/A O-rings are used in the military defense and agriculture industries.
P285 B-90	N/A 178400	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 90	N/A 284.50 mm11.201 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-285	N/A O-rings are used in the military defense and agriculture industries.
P29 B-70	N/A 178401	N/A JIS Standard O-Ring	N/A Buna	N/A 0.138 in3.50 mm	N/A 70	N/A 28.70 mm1.130 in	N/A 0.004 in0.10 mm	N/A 0.006 in0.15 mm	N/A P-29	N/A O-rings are used in the military defense and agriculture industries.
P29 B-90	N/A 178402	N/A JIS Standard O-Ring	N/A Buna	N/A 0.138 in3.50 mm	N/A 90	N/A 28.70 mm1.130 in	N/A 0.004 in0.10 mm	N/A 0.006 in0.15 mm	N/A P-29	N/A O-rings are used in the military defense and agriculture industries.
P29.5 B-70	N/A 178403	N/A JIS Standard O-Ring	N/A Buna	N/A 0.138 in3.50 mm	N/A 70	N/A 29.20 mm1.150 in	N/A 0.004 in0.10 mm	N/A 0.006 in0.15 mm	N/A P-29.5	N/A O-rings are used in the military defense and agriculture industries.
P29.5 B-90	N/A 178404	N/A JIS Standard O-Ring	N/A Buna	N/A 0.138 in3.50 mm	N/A 90	N/A 29.20 mm1.150 in	N/A 0.004 in0.10 mm	N/A 0.006 in0.15 mm	N/A P-29.5	N/A O-rings are used in the military defense and agriculture industries.
P290 B-70	N/A 178405	N/A JIS Standard O-Ring	N/A Buna	N/A 0.331 in8.40 mm	N/A 70	N/A 289.50 mm11.398 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-290	N/A O-rings are used in the military defense and agriculture industries.

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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

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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