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JIS B 2401 Metric O-Rings Size Chart

JIS B 2401 Metric O-Rings Size Chart

JIS B 2401 is a Japanese Industrial Standard for O-Ring sizes. This standard, often referred to as “Japanese Metrics”, is organized into four series, based on their application. The O-Rings in each section have ascending number codes to complete the size reference.
For a complete listing of all metric o-ring sizes, visit our Metric O-Ring Cross Reference Table.
Click on a Series below to view the size chart for that particular series, or scroll down to see the size chart for all JIS sizes sorted from smallest to largest, C/S then I.D.

All JIS Sizes – Sorted by Size

ReferenceC/S (MM)I.D. (MM)C/S (Inch)I.D. (Inch)
S31.52.50.0590.098
S41.53.50.0590.138
S51.54.50.0590.177
S61.55.50.0590.217
S71.56.50.0590.256
S81.57.50.0590.295
S91.58.50.0590.335
S101.59.50.0590.374
S11.21.510.70.0590.421
S121.511.50.0590.453
S12.51.5120.0590.472
S141.513.50.0590.531
S151.514.50.0590.571
S161.515.50.0590.61
S181.517.50.0590.689
S201.519.50.0590.768
S221.521.50.0590.846
P31.92.80.0750.11
P41.93.80.0750.15
P51.94.80.0750.189
P61.95.80.0750.228
P71.96.80.0750.268
P81.97.80.0750.307
P91.98.80.0750.346
P101.99.80.0750.386
S22.4221.90.0790.862
S24223.50.0790.925
S25224.50.0790.965
S26225.50.0791.004
S28227.50.0791.083
S29228.50.0791.122
S30229.50.0791.161
S31.52310.0791.22
S32231.50.0791.24
S34233.50.0791.319
S35234.50.0791.358
S35.52350.0791.378
S36235.50.0791.398
S38237.50.0791.476
S39238.50.0791.516
S40239.50.0791.555
S42241.50.0791.634
S44243.50.0791.713
S45244.50.0791.752
S46245.50.0791.791
S48247.50.0791.87
S50249.50.0791.949
S53252.50.0792.067
S55254.50.0792.146
S56255.50.0792.185
S60259.50.0792.343
S63262.50.0792.461
S65264.50.0792.539
S67266.50.0792.618
S70269.50.0792.736
S71270.50.0792.776
S75274.50.0792.933
S80279.50.0793.13
S85284.50.0793.327
S90289.50.0793.524
S95294.50.0793.72
S100299.50.0793.917
S1052104.50.0794.114
S1102109.50.0794.311
S1122111.50.0794.39
S1152114.50.0794.508
S1202119.50.0794.705
S1252124.50.0794.902
S1302129.50.0795.098
S1322131.50.0795.177
S1352134.50.0795.295
S1402139.50.0795.492
S1452144.50.0795.689
S1502149.50.0795.886
P10A2.49.80.0940.386
P112.410.80.0940.425
P11.22.4110.0940.433
P122.411.80.0940.465
P12.52.412.30.0940.484
P132.412.80.0940.504
P142.413.80.0940.543
P152.414.80.0940.583
P162.415.80.0940.622
P172.416.80.0940.661
P182.417.80.0940.701
P192.418.80.0940.74
P202.419.80.0940.78
P212.420.80.0940.819
P222.421.80.0940.858
G253.124.40.1220.961
G303.129.40.1221.157
G353.134.40.1221.354
G403.139.40.1221.551
G453.144.40.1221.748
G503.149.40.1221.945
G553.154.40.1222.142
G603.159.40.1222.339
G653.164.40.1222.535
G703.169.40.1222.732
G753.174.40.1222.929
G803.179.40.1223.126
G853.184.40.1223.323
G903.189.40.1223.52
G953.194.40.1223.717
G1003.199.40.1223.913
G1053.1104.40.1224.11
G1103.1109.40.1224.307
G1153.1114.40.1224.504
G1203.1119.40.1224.701
G1253.1124.40.1224.898
G1303.1129.40.1225.094
G1353.1134.40.1225.291
G1403.1139.40.1225.488
G1453.1144.40.1225.685
P22A3.521.70.1380.854
P22.43.522.10.1380.87
P243.523.70.1380.933
P253.524.70.1380.972
P25.53.525.20.1380.992
P263.525.70.1381.012
P283.527.70.1381.091
P293.528.70.1381.13
P29.53.529.20.1381.15
P303.529.70.1381.169
P313.530.70.1381.209
P31.53.531.20.1381.228
P323.531.70.1381.248
P333.532.70.1381.287
P343.533.70.1381.327
P353.534.70.1381.366
P35.53.535.20.1381.386
P363.535.70.1381.406
P383.537.70.1381.484
P393.538.70.1381.524
P403.539.70.1381.563
P413.540.70.1381.602
P423.541.70.1381.642
P443.543.70.1381.72
P453.544.70.1381.76
P463.545.70.1381.799
P483.547.70.1381.878
P493.548.70.1381.917
P503.549.70.1381.957
V15414.50.1570.571
V24423.50.1570.925
V34433.50.1571.319
V40439.50.1571.555
V55454.50.1572.146
V704690.1572.717
V854840.1573.307
V1004990.1573.898
V12041190.1574.685
V1504148.50.1575.846
V17541730.1576.811
P48A5.747.60.2241.874
P50A5.749.60.2241.953
P525.751.60.2242.031
P535.752.60.2242.071
P555.754.60.2242.15
P565.755.60.2242.189
P585.757.60.2242.268
P605.759.60.2242.346
P625.761.60.2242.425
P635.762.60.2242.465
P655.764.60.2242.543
P675.766.60.2242.622
P705.769.60.2242.74
P715.770.60.2242.78
P755.774.60.2242.937
P805.779.60.2243.134
P855.784.60.2243.331
P905.789.60.2243.528
P955.794.60.2243.724
P1005.799.60.2243.921
P1025.7101.60.2244
P1055.7104.60.2244.118
P1105.7109.60.2244.315
P1125.7111.60.2244.394
P1155.7114.60.2244.512
P1205.7119.60.2244.709
P1255.7124.60.2244.906
P1305.7129.60.2245.102
P1325.7131.60.2245.181
P1355.7134.60.2245.299
P1405.7139.60.2245.496
P1455.7144.60.2245.693
G1505.7149.30.2245.878
P1505.7149.60.2245.89
G1555.7154.30.2246.075
G1605.7159.30.2246.272
G1655.7164.30.2246.469
G1705.7169.30.2246.665
G1755.7174.30.2246.862
G1805.7179.30.2247.059
G1855.7184.30.2247.256
G1905.7189.30.2247.453
G1955.7194.30.2247.65
G2005.7199.30.2247.846
G2055.7204.30.2248.043
G2105.7209.30.2248.24
G2155.7214.30.2248.437
G2205.7219.30.2248.634
G2255.7224.30.2248.831
G2305.7229.30.2249.028
G2355.7234.30.2249.224
G2405.7239.30.2249.421
G2455.7244.30.2249.618
G2505.7249.30.2249.815
G2555.7254.30.22410.012
G2605.7259.30.22410.209
G2655.7264.30.22410.406
G2705.7269.30.22410.602
G2805.7279.30.22410.996
G2855.7284.30.22411.193
G2905.7289.30.22411.39
G3005.7299.30.22411.783
G3055.7304.30.22411.98
G3105.7309.30.22412.177
G3155.7314.30.22412.374
G3205.7319.30.22412.571
G3255.7324.30.22412.768
G3305.7329.30.22412.965
G3355.7334.30.22413.161
G3405.7339.30.22413.358
G3455.7344.30.22413.555
G3505.7349.30.22413.752
G3555.7354.30.22413.949
G3605.7359.30.22414.146
G3655.7364.30.22414.343
G3705.7369.30.22414.539
G3755.7374.30.22414.736
G3805.7379.30.22414.933
G3855.7384.30.22415.13
G3905.7389.30.22415.327
G3955.7394.30.22415.524
G4005.7399.30.22415.72
G4055.7404.30.22415.917
G4105.7409.30.22416.114
G4155.7414.30.22416.311
G4205.7419.30.22416.508
G4255.7424.30.22416.705
G4305.7429.30.22416.902
G4355.7435.30.22417.138
G4405.7439.30.22417.295
G4455.7444.30.22417.492
G4505.7449.30.22417.689
G4555.7454.30.22417.886
G4605.7459.30.22418.083
G4655.7464.30.22418.28
G4705.7469.30.22418.476
G4755.7474.30.22418.673
G4805.7479.30.22418.87
G4855.7484.30.22419.067
G4905.7489.30.22419.264
G4955.7494.30.22419.461
G5005.7499.30.22419.657
G5105.7509.30.22420.051
G5205.7519.30.22420.445
V2256222.50.2368.76
V27562720.23610.709
V3256321.50.23612.657
V38063760.23614.803
V4306425.50.23616.752
P150A8.4149.50.3315.886
P1558.4154.50.3316.083
P1608.4159.50.3316.28
P1658.4164.50.3316.476
P1708.4169.50.3316.673
P1758.4174.50.3316.87
P1808.4179.50.3317.067
P1858.4184.50.3317.264
P1908.4189.50.3317.461
P1958.4194.50.3317.657
P2008.4199.50.3317.854
P2058.4204.50.3318.051
P2098.4208.50.3318.209
P2108.4209.50.3318.248
P2158.4214.50.3318.445
P2208.4219.50.3318.642
P2258.4224.50.3318.839
P2308.4229.50.3319.035
P2358.4234.50.3319.232
P2408.4239.50.3319.429
P2458.4244.50.3319.626
P2508.4249.50.3319.823
P2558.4254.50.33110.02
P2608.4259.50.33110.217
P2658.4264.50.33110.413
P2708.4269.50.33110.61
P2758.4274.50.33110.807
P2808.4279.50.33111.004
P2858.4284.50.33111.201
P2908.4289.50.33111.398
P2958.4294.50.33111.594
P3008.4299.50.33111.791
P3058.4304.50.33111.988
P3108.4309.50.33112.185
P3158.4314.50.33112.382
P3208.4319.50.33112.579
P3358.4334.50.33113.169
P3408.4339.50.33113.366
P3508.4349.50.33113.76
P3558.4354.50.33113.957
P3608.4359.50.33114.154
P3758.4374.50.33114.744
P3808.4379.50.33114.941
P3858.4384.50.33115.138
P3908.4389.50.33115.335
P4008.4399.50.33115.728
P4108.4409.50.33116.122
P4208.4419.50.33116.516
P4408.4439.50.33117.303
P4508.4449.50.33117.697
P4708.4469.50.33118.484
P4808.4479.50.33118.878
V480104750.39418.701
V53010524.50.39420.65
V585105790.39422.795
V64010633.50.39424.941
V690106830.39426.89
V74010732.50.39428.839
V790107820.39430.787
V84510836.50.39432.933
V95010940.50.39437.028
V10551010440.39441.102
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JIS – P Series

ReferenceC/S (MM)I.D. (MM)
P31.92.8
P41.93.8
P51.94.8
P61.95.8
P71.96.8
P81.97.8
P91.98.8
P101.99.8
P10A2.49.8
P112.410.8
P11.22.411
P122.411.8
P12.52.412.3
P132.412.8
P142.413.8
P152.414.8
P162.415.8
P172.416.8
P182.417.8
P192.418.8
P202.419.8
P212.420.8
P222.421.8
P22A3.521.7
P22.43.522.1
P243.523.7
P253.524.7
P25.53.525.2
P263.525.7
P283.527.7
P293.528.7
P29.53.529.2
P303.529.7
P313.530.7
P31.53.531.2
P323.531.7
P333.532.7
P343.533.7
P353.534.7
P35.53.535.2
P363.535.7
P383.537.7
P393.538.7
P403.539.7
P413.540.7
P423.541.7
P443.543.7
P453.544.7
P463.545.7
P483.547.7
P493.548.7
P503.549.7
P48A5.747.6
P50A5.749.6
P525.751.6
P535.752.6
P555.754.6
P565.755.6
P585.757.6
P605.759.6
P625.761.6
P635.762.6
P655.764.6
P675.766.6
P705.769.6
P715.770.6
P755.774.6
P805.779.6
P855.784.6
P905.789.6
P955.794.6
P1005.799.6
P1025.7101.6
P1055.7104.6
P1105.7109.6
P1125.7111.6
P1155.7114.6
P1205.7119.6
P1255.7124.6
P1305.7129.6
P1325.7131.6
P1355.7134.6
P1405.7139.6
P1455.7144.6
P1505.7149.6
P150A8.4149.5
P1558.4154.5
P1608.4159.5
P1658.4164.5
P1708.4169.5
P1758.4174.5
P1808.4179.5
P1858.4184.5
P1908.4189.5
P1958.4194.5
P2008.4199.5
P2058.4204.5
P2098.4208.5
P2108.4209.5
P2158.4214.5
P2208.4219.5
P2258.4224.5
P2308.4229.5
P2358.4234.5
P2408.4239.5
P2458.4244.5
P2508.4249.5
P2558.4254.5
P2608.4259.5
P2658.4264.5
P2708.4269.5
P2758.4274.5
P2808.4279.5
P2858.4284.5
P2908.4289.5
P2958.4294.5
P3008.4299.5
P3058.4304.5
P3108.4309.5
P3158.4314.5
P3208.4319.5
P3358.4334.5
P3408.4339.5
P3508.4349.5
P3558.4354.5
P3608.4359.5
P3758.4374.5
P3808.4379.5
P3858.4384.5
P3908.4389.5
P4008.4399.5
P4108.4409.5
P4208.4419.5
P4408.4439.5
P4508.4449.5
P4708.4469.5
P4808.4479.5
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JIS – G Series

ReferenceC/S (MM)I.D. (MM)
G253.124.4
G303.129.4
G353.134.4
G403.139.4
G453.144.4
G503.149.4
G553.154.4
G603.159.4
G653.164.4
G703.169.4
G753.174.4
G803.179.4
G853.184.4
G903.189.4
G953.194.4
G1003.199.4
G1053.1104.4
G1103.1109.4
G1153.1114.4
G1203.1119.4
G1253.1124.4
G1303.1129.4
G1353.1134.4
G1403.1139.4
G1453.1144.4
G1505.7149.3
G1555.7154.3
G1605.7159.3
G1655.7164.3
G1705.7169.3
G1755.7174.3
G1805.7179.3
G1855.7184.3
G1905.7189.3
G1955.7194.3
G2005.7199.3
G2055.7204.3
G2105.7209.3
G2155.7214.3
G2205.7219.3
G2255.7224.3
G2305.7229.3
G2355.7234.3
G2405.7239.3
G2455.7244.3
G2505.7249.3
G2555.7254.3
G2605.7259.3
G2655.7264.3
G2705.7269.3
G2805.7279.3
G2855.7284.3
G2905.7289.3
G3005.7299.3
G3055.7304.3
G3105.7309.3
G3155.7314.3
G3205.7319.3
G3255.7324.3
G3305.7329.3
G3355.7334.3
G3405.7339.3
G3455.7344.3
G3505.7349.3
G3555.7354.3
G3605.7359.3
G3655.7364.3
G3705.7369.3
G3755.7374.3
G3805.7379.3
G3855.7384.3
G3905.7389.3
G3955.7394.3
G4005.7399.3
G4055.7404.3
G4105.7409.3
G4155.7414.3
G4205.7419.3
G4255.7424.3
G4305.7429.3
G4355.7435.3
G4405.7439.3
G4455.7444.3
G4505.7449.3
G4555.7454.3
G4605.7459.3
G4655.7464.3
G4705.7469.3
G4755.7474.3
G4805.7479.3
G4855.7484.3
G4905.7489.3
G4955.7494.3
G5005.7499.3
G5105.7509.3
G5205.7519.3
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JIS – S Series

ReferenceC/S (MM)I.D. (MM)
S31.52.5
S41.53.5
S51.54.5
S61.55.5
S71.56.5
S81.57.5
S91.58.5
S101.59.5
S11.21.510.7
S121.511.5
S12.51.512
S141.513.5
S151.514.5
S161.515.5
S181.517.5
S201.519.5
S221.521.5
S22.4221.9
S24223.5
S25224.5
S26225.5
S28227.5
S29228.5
S30229.5
S31.5231
S32231.5
S34233.5
S35234.5
S35.5235
S36235.5
S38237.5
S39238.5
S40239.5
S42241.5
S44243.5
S45244.5
S46245.5
S48247.5
S50249.5
S53252.5
S55254.5
S56255.5
S60259.5
S63262.5
S65264.5
S67266.5
S70269.5
S71270.5
S75274.5
S80279.5
S85284.5
S90289.5
S95294.5
S100299.5
S1052104.5
S1102109.5
S1122111.5
S1152114.5
S1202119.5
S1252124.5
S1302129.5
S1322131.5
S1352134.5
S1402139.5
S1452144.5
S1502149.5
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JIS – V Series

ReferenceGlobal Part#C/S (MM)
V15414.5
V24423.5
V34433.5
V40439.5
V55454.5
V70469
V85484
V100499
V1204119
V1504148.5
V1754173
V2256222.5
V2756272
V3256321.5
V3806376
V4306425.5
V48010475
V53010524.5
V58510579
V64010633.5
V69010683
V74010732.5
V79010782
V84510836.5
V95010940.5
V1055101044
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