JIS Silicone O-Rings

OneMonroe's JIS Silicone O-Rings are engineered to provide exceptional sealing performance in the most demanding applications. Crafted from high-quality silicone material, these O-rings are designed to withstand extreme temperatures, pressures, and chemical exposures, making them ideal for use in various industrial sectors, including automotive, aerospace, medical, and food processing. Their robust construction ensures a dependable seal that prevents leaks and protects equipment, providing long-lasting durability and reliability. With compliance to Japanese Industrial Standards (JIS), these O-rings offer precise dimensions and compatibility with a wide range of machinery and equipment, ensuring seamless integration in critical systems.

The unique properties of silicone make these O-rings an excellent choice for challenging environments. Silicone offers outstanding resistance to oxidation, UV light, and ozone, as well as flexibility across a broad temperature range. These qualities enable OneMonroe JIS Silicone O-Rings to perform reliably in both high-heat and low-temperature applications, without losing elasticity or shape. Whether you are working in freezing cold or intense heat, these O-rings maintain their integrity, providing consistent performance that helps to reduce maintenance and downtime for your equipment.

In addition to superior material quality, OneMonroe places a strong emphasis on product consistency and reliability. Each JIS Silicone O-Ring undergoes rigorous quality control to ensure it meets both JIS standards and our own stringent specifications. This attention to detail ensures that customers receive products they can trust for critical sealing applications. With our extensive range of sizes and dimensions, OneMonroe JIS Silicone O-Rings are a versatile solution that adapts to various needs, supporting efficiency, safety, and reliability in your systems. Choose OneMonroe for a high-performance, industry-compliant sealing solution you can depend on.

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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Cross Section Width (mm)

Inside Diameter (mm)

Inside Diameter (in)

Item #	IntegrationID	Type	Material	Cross Section Width	Durometer	Inside Diameter	CSW Tolerance	ID Tolerance	JIS Number

P250 S-70	N/A 180361	N/A JIS Standard O-Ring	N/A Silicone	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
P255 S-70	N/A 180362	N/A JIS Standard O-Ring	N/A Silicone	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
P26 S-70	N/A 180363	N/A JIS Standard O-Ring	N/A Silicone	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
P260 S-70	N/A 180364	N/A JIS Standard O-Ring	N/A Silicone	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
P265 S-70	N/A 180365	N/A JIS Standard O-Ring	N/A Silicone	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
P270 S-70	N/A 180366	N/A JIS Standard O-Ring	N/A Silicone	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
P275 S-70	N/A 180367	N/A JIS Standard O-Ring	N/A Silicone	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
P28 S-70	N/A 180368	N/A JIS Standard O-Ring	N/A Silicone	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
P280 S-70	N/A 180369	N/A JIS Standard O-Ring	N/A Silicone	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
P285 S-70	N/A 180370	N/A JIS Standard O-Ring	N/A Silicone	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
P29 S-70	N/A 180371	N/A JIS Standard O-Ring	N/A Silicone	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
P29.5 S-70	N/A 180372	N/A JIS Standard O-Ring	N/A Silicone	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
P290 S-70	N/A 180373	N/A JIS Standard O-Ring	N/A Silicone	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
P295 S-70	N/A 180374	N/A JIS Standard O-Ring	N/A Silicone	N/A 0.331 in8.40 mm	N/A 70	N/A 294.50 mm11.594 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-295
P30 S-70	N/A 180375	N/A JIS Standard O-Ring	N/A Silicone	N/A 0.138 in3.50 mm	N/A 70	N/A 29.70 mm1.169 in	N/A 0.004 in0.10 mm	N/A 0.006 in0.15 mm	N/A P-30
P300 S-70	N/A 180376	N/A JIS Standard O-Ring	N/A Silicone	N/A 0.331 in8.40 mm	N/A 70	N/A 299.50 mm11.791 in	N/A 0.006 in0.18 mm	N/A 0.031 in0.80 mm	N/A P-300
P31 S-70	N/A 180377	N/A JIS Standard O-Ring	N/A Silicone	N/A 0.138 in3.50 mm	N/A 70	N/A 30.70 mm1.209 in	N/A 0.004 in0.10 mm	N/A 0.006 in0.15 mm	N/A P-31
P31.5 S-70	N/A 180378	N/A JIS Standard O-Ring	N/A Silicone	N/A 0.138 in3.50 mm	N/A 70	N/A 31.20 mm1.228 in	N/A 0.004 in0.10 mm	N/A 0.006 in0.15 mm	N/A P-31.5
P315 S-70	N/A 180379	N/A JIS Standard O-Ring	N/A Silicone	N/A 0.331 in8.40 mm	N/A 70	N/A 314.50 mm12.382 in	N/A 0.006 in0.18 mm	N/A 0.039 in1.00 mm	N/A P-315
P32 S-70	N/A 180380	N/A JIS Standard O-Ring	N/A Silicone	N/A 0.138 in3.50 mm	N/A 70	N/A 31.70 mm1.248 in	N/A 0.004 in0.10 mm	N/A 0.006 in0.15 mm	N/A P-32
P320 S-70	N/A 180381	N/A JIS Standard O-Ring	N/A Silicone	N/A 0.331 in8.40 mm	N/A 70	N/A 319.50 mm12.579 in	N/A 0.006 in0.18 mm	N/A 0.039 in1.00 mm	N/A P-320
P335 S-70	N/A 180382	N/A JIS Standard O-Ring	N/A Silicone	N/A 0.331 in8.40 mm	N/A 70	N/A 334.50 mm13.169 in	N/A 0.006 in0.18 mm	N/A 0.039 in1.00 mm	N/A P-335
P34 S-70	N/A 180383	N/A JIS Standard O-Ring	N/A Silicone	N/A 0.138 in3.50 mm	N/A 70	N/A 33.70 mm1.327 in	N/A 0.004 in0.10 mm	N/A 0.006 in0.15 mm	N/A P-34
P340 S-70	N/A 180384	N/A JIS Standard O-Ring	N/A Silicone	N/A 0.331 in8.40 mm	N/A 70	N/A 339.50 mm13.366 in	N/A 0.006 in0.18 mm	N/A 0.039 in1.00 mm	N/A P-340
P35 S-70	N/A 180385	N/A JIS Standard O-Ring	N/A Silicone	N/A 0.138 in3.50 mm	N/A 70	N/A 34.70 mm1.366 in	N/A 0.004 in0.10 mm	N/A 0.006 in0.15 mm	N/A P-35

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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