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BS 1806 Metric Size Chart

BS 1806 Metric Size Chart

The BS 1806 O-Ring size guide was issued by the British Standards Institution and lists all Imperial standard sizes. This standard includes all of the 5 main cross section groups in AS568 plus several sizes that are “between” AS568 Sizes. BS 1806 has been superseded by BS ISO 3601, however, since BS 1806 is still widely referenced in certain industries / regions of the world, it is still relevant for cross reference purposes.
For a complete listing of all metric o-ring sizes, visit our Metric O-Ring Cross Reference Table.

BS 1806 Size Chart

Global Part#ReferenceC/S (MM)I.D. (MM)C/S (Inch)I.D. (Inch)
1.02X000.74-0011.020.740.040.029
1.02X001.78-6061.021.780.040.07
1.02X002.54-6071.022.540.040.1
1.27X001.07-0021.271.070.050.042
1.52X001.42-0031.521.420.060.056
1.63X006.07-9021.636.070.0640.239
1.63X007.65-9031.637.650.0640.301
1.78X001.78-0041.781.780.070.07
1.78X002.57-0051.782.570.070.101
1.78X002.9-0061.782.90.070.114
1.78X003.18-8011.783.180.070.125
1.78X003.68-0071.783.680.070.145
1.78X004.47-0081.784.470.070.176
1.78X004.75-8021.784.750.070.187
1.78X005.28-0091.785.280.070.208
1.78X006.07-0101.786.070.070.239
1.78X006.35-8031.786.350.070.25
1.78X006.76-6101.786.760.070.266
1.78X007.65-0111.787.650.070.301
1.78X007.94-8041.787.940.070.313
1.78X008.74-6111.788.740.070.344
1.78X009.25-0121.789.250.070.364
1.78X010.82-0131.7810.820.070.426
1.78X011.1-8061.7811.10.070.437
1.78X012.42-0141.7812.420.070.489
1.78X014-0151.78140.070.551
1.78X015.6-0161.7815.60.070.614
1.78X017.17-0171.7817.170.070.676
1.78X018.77-0181.7818.770.070.739
1.78X020.35-0191.7820.350.070.801
1.78X021.95-0201.7821.950.070.864
1.78X023.52-0211.7823.520.070.926
1.78X025.12-0221.7825.120.070.989
1.78X026.7-0231.7826.70.071.051
1.78X028.3-0241.7828.30.071.114
1.78X029.87-0251.7829.870.071.176
1.78X031.47-0261.7831.470.071.239
1.78X033.05-0271.7833.050.071.301
1.78X034.65-0281.7834.650.071.364
1.78X036.27-5171.7836.270.071.428
1.78X037.82-0291.7837.820.071.489
1.78X039.45-5191.7839.450.071.553
1.78X041-0301.78410.071.614
1.78X044.17-0311.7844.170.071.739
1.78X047.35-0321.7847.350.071.864
1.78X050.52-0331.7850.520.071.989
1.78X053.7-0341.7853.70.072.114
1.78X056.87-0351.7856.870.072.239
1.78X060.05-0361.7860.050.072.364
1.78X063.22-0371.7863.220.072.489
1.78X066.4-0381.7866.40.072.614
1.78X069.57-0391.7869.570.072.739
1.78X072.75-0401.7872.750.072.864
1.78X075.92-0411.7875.920.072.989
1.78X078.99-5321.7878.990.073.11
1.78X082.27-0421.7882.270.073.239
1.78X085.34-5341.7885.340.073.36
1.78X088.62-0431.7888.620.073.489
1.78X091.69-5361.7891.690.073.61
1.78X094.97-0441.7894.970.073.739
1.78X098.04-5381.7898.040.073.86
1.78X101.32-0451.78101.320.073.989
1.78X104.39-5401.78104.390.074.11
1.78X107.67-0461.78107.670.074.239
1.78X110.74-5421.78110.740.074.36
1.78X114.02-0471.78114.020.074.489
1.78X117.09-5441.78117.090.074.61
1.78X120.37-0481.78120.370.074.739
1.78X123.44-5461.78123.440.074.86
1.78X126.72-0491.78126.720.074.989
1.78X129.41-5481.78129.410.075.095
1.78X133.07-0501.78133.070.075.239
1.78X135.76-5501.78135.760.075.345
1.78X138.94-5511.78138.940.075.47
1.78X142.11-5521.78142.110.075.595
1.78X145.29-5531.78145.290.075.72
1.78X148.46-5541.78148.460.075.845
1.78X151.64-5551.78151.640.075.97
1.78X154.81-5561.78154.810.076.095
1.78X157.99-5571.78157.990.076.22
1.78X161.16-5581.78161.160.076.345
1.78X164.34-5591.78164.340.076.47
1.78X170.05-5601.78170.050.076.695
1.78X170.69-5611.78170.690.076.72
1.78X173.86-5621.78173.860.076.845
2.62X001.24-1022.621.240.1030.049
2.62X002.06-1032.622.060.1030.081
2.62X002.84-1042.622.840.1030.112
2.62X003.63-1052.623.630.1030.143
2.62X004.45-1062.624.450.1030.175
2.62X005.23-1072.625.230.1030.206
2.62X006.02-1082.626.020.1030.237
2.62X007.59-1092.627.590.1030.299
2.62X009.19-1102.629.190.1030.362
2.62X009.93-6132.629.930.1030.391
2.62X010.77-1112.6210.770.1030.424
2.62X011.91-6142.6211.910.1030.469
2.62X012.37-1122.6212.370.1030.487
2.62X012.7-8072.6212.70.1030.5
2.62X013.11-6152.6213.110.1030.516
2.62X013.94-1132.6213.940.1030.549
2.62X015.09-6162.6215.090.1030.594
2.62X015.54-1142.6215.540.1030.612
2.62X015.88-8092.6215.880.1030.625
2.62X017.12-1152.6217.120.1030.674
2.62X017.45-8102.6217.450.1030.687
2.62X017.86-6172.6217.860.1030.703
2.62X018.72-1162.6218.720.1030.737
2.62X020.29-1172.6220.290.1030.799
2.62X020.62-8122.6220.620.1030.812
2.62X021.89-1182.6221.890.1030.862
2.62X022.23-8132.6222.230.1030.875
2.62X023.47-1192.6223.470.1030.924
2.62X023.8-8142.6223.80.1030.937
2.62X025.07-1202.6225.070.1030.987
2.62X026.64-1212.6226.640.1031.049
2.62X028.24-1222.6228.240.1031.112
2.62X029.82-1232.6229.820.1031.174
2.62X031.42-1242.6231.420.1031.237
2.62X032.99-1252.6232.990.1031.299
2.62X034.59-1262.6234.590.1031.362
2.62X036.17-1272.6236.170.1031.424
2.62X037.77-1282.6237.770.1031.487
2.62X039.34-1292.6239.340.1031.549
2.62X040.94-1302.6240.940.1031.612
2.62X042.52-1312.6242.520.1031.674
2.62X044.12-1322.6244.120.1031.737
2.62X045.69-1332.6245.690.1031.799
2.62X047.29-1342.6247.290.1031.862
2.62X048.9-1352.6248.90.1031.925
2.62X050.47-1362.6250.470.1031.987
2.62X052.07-1372.6252.070.1032.05
2.62X053.64-1382.6253.640.1032.112
2.62X055.25-1392.6255.250.1032.175
2.62X056.82-1402.6256.820.1032.237
2.62X058.42-1412.6258.420.1032.3
2.62X059.99-1422.6259.990.1032.362
2.62X061.6-1432.6261.60.1032.425
2.62X063.17-1442.6263.170.1032.487
2.62X064.77-1452.6264.770.1032.55
2.62X066.34-1462.6266.340.1032.612
2.62X067.95-1472.6267.950.1032.675
2.62X069.52-1482.6269.520.1032.737
2.62X071.12-1492.6271.120.1032.8
2.62X072.69-1502.6272.690.1032.862
2.62X074.27-6402.6274.270.1032.924
2.62X075.87-1512.6275.870.1032.987
2.62X077.44-6412.6277.440.1033.049
2.62X080.62-6422.6280.620.1033.174
2.62X082.22-1522.6282.220.1033.237
2.62X083.79-6432.6283.790.1033.299
2.62X088.57-1532.6288.570.1033.487
2.62X094.92-1542.6294.920.1033.737
2.62X101.27-1552.62101.270.1033.987
2.62X107.62-1562.62107.620.1034.237
2.62X113.97-1572.62113.970.1034.487
2.62X120.32-1582.62120.320.1034.737
2.62X126.67-1592.62126.670.1034.987
2.62X133.02-1602.62133.020.1035.237
2.62X139.37-1612.62139.370.1035.487
2.62X145.72-1622.62145.720.1035.737
2.62X152.07-1632.62152.070.1035.987
2.62X158.42-1642.62158.420.1036.237
2.62X164.77-1652.62164.770.1036.487
2.62X171.12-1662.62171.120.1036.737
2.62X177.47-1672.62177.470.1036.987
2.62X183.82-1682.62183.820.1037.237
2.62X190.17-1692.62190.170.1037.487
2.62X196.52-1702.62196.520.1037.737
2.62X202.87-1712.62202.870.1037.987
2.62X209.22-1722.62209.220.1038.237
2.62X215.57-1732.62215.570.1038.487
2.62X221.92-1742.62221.920.1038.737
2.62X228.27-1752.62228.270.1038.987
2.62X234.62-1762.62234.620.1039.237
2.62X240.97-1772.62240.970.1039.487
2.62X247.32-1782.62247.320.1039.737
3.53X004.34-2013.534.340.1390.171
3.53X005.94-2023.535.940.1390.234
3.53X007.52-2033.537.520.1390.296
3.53X009.12-2043.539.120.1390.359
3.53X010.69-2053.5310.690.1390.421
3.53X012.29-2063.5312.290.1390.484
3.53X013.94-2073.5313.940.1390.549
3.53X015.47-2083.5315.470.1390.609
3.53X017.07-2093.5317.070.1390.672
3.53X018.64-2103.5318.640.1390.734
3.53X020.22-2113.5320.220.1390.796
3.53X021.82-2123.5321.820.1390.859
3.53X023.39-2133.5323.390.1390.921
3.53X024.99-2143.5324.990.1390.984
3.53X025.81-6183.5325.810.1391.016
3.53X026.57-2153.5326.570.1391.046
3.53X028.17-2163.5328.170.1391.109
3.53X029.74-2173.5329.740.1391.171
3.53X031.34-2183.5331.340.1391.234
3.53X032.92-2193.5332.920.1391.296
3.53X034.52-2203.5334.520.1391.359
3.53X036.09-2213.5336.090.1391.421
3.53X037.69-2223.5337.690.1391.484
3.53X039.7-8243.5339.70.1391.563
3.53X040.87-2233.5340.870.1391.609
3.53X041.28-8253.5341.280.1391.625
3.53X042.85-8263.5342.850.1391.687
3.53X044.04-2243.5344.040.1391.734
3.53X044.45-8273.5344.450.1391.75
3.53X046.04-8283.5346.040.1391.813
3.53X047.22-2253.5347.220.1391.859
3.53X047.63-8293.5347.630.1391.875
3.53X049.2-8303.5349.20.1391.937
3.53X050.39-2263.5350.390.1391.984
3.53X050.8-8313.5350.80.1392
3.53X052.39-8323.5352.390.1392.063
3.53X053.57-2273.5353.570.1392.109
3.53X053.98-8333.5353.980.1392.125
3.53X055.55-8343.5355.550.1392.187
3.53X056.74-2283.5356.740.1392.234
3.53X057.15-8353.5357.150.1392.25
3.53X058.74-8363.5358.740.1392.313
3.53X059.92-2293.5359.920.1392.359
3.53X060.33-8373.5360.330.1392.375
3.53X061.9-8383.5361.90.1392.437
3.53X063.09-2303.5363.090.1392.484
3.53X063.5-8393.5363.50.1392.5
3.53X065.1-8403.5365.10.1392.563
3.53X066.27-2313.5366.270.1392.609
3.53X066.68-8413.5366.680.1392.625
3.53X068.25-8423.5368.250.1392.687
3.53X069.44-2323.5369.440.1392.734
3.53X069.85-8433.5369.850.1392.75
3.53X071.44-8443.5371.440.1392.813
3.53X072.62-2333.5372.620.1392.859
3.53X073.03-8453.5373.030.1392.875
3.53X074.6-8463.5374.60.1392.937
3.53X075.79-2343.5375.790.1392.984
3.53X078.97-2353.5378.970.1393.109
3.53X082.14-2363.5382.140.1393.234
3.53X085.32-2373.5385.320.1393.359
3.53X088.49-2383.5388.490.1393.484
3.53X091.67-2393.5391.670.1393.609
3.53X094.84-2403.5394.840.1393.734
3.53X098.02-2413.5398.020.1393.859
3.53X101.19-2423.53101.190.1393.984
3.53X104.37-2433.53104.370.1394.109
3.53X107.54-2443.53107.540.1394.234
3.53X110.72-2453.53110.720.1394.359
3.53X113.89-2463.53113.890.1394.484
3.53X117.07-2473.53117.070.1394.609
3.53X120.24-2483.53120.240.1394.734
3.53X123.42-2493.53123.420.1394.859
3.53X126.59-2503.53126.590.1394.984
3.53X129.77-2513.53129.770.1395.109
3.53X132.94-2523.53132.940.1395.234
3.53X136.12-2533.53136.120.1395.359
3.53X139.29-2543.53139.290.1395.484
3.53X142.47-2553.53142.470.1395.609
3.53X145.64-2563.53145.640.1395.734
3.53X148.82-2573.53148.820.1395.859
3.53X151.99-2583.53151.990.1395.984
3.53X158.34-2593.53158.340.1396.234
3.53X164.69-2603.53164.690.1396.484
3.53X171.04-2613.53171.040.1396.734
3.53X177.39-2623.53177.390.1396.984
3.53X183.74-2633.53183.740.1397.234
3.53X190.09-2643.53190.090.1397.484
3.53X196.44-2653.53196.440.1397.734
3.53X202.79-2663.53202.790.1397.984
3.53X209.14-2673.53209.140.1398.234
3.53X215.49-2683.53215.490.1398.484
3.53X221.84-2693.53221.840.1398.734
3.53X228.19-2703.53228.190.1398.984
3.53X234.54-2713.53234.540.1399.234
3.53X240.89-2723.53240.890.1399.484
3.53X247.24-2733.53247.240.1399.734
3.53X253.59-2743.53253.590.1399.984
3.53X266.29-2753.53266.290.13910.484
3.53X278.99-2763.53278.990.13910.984
3.53X291.69-2773.53291.690.13911.484
3.53X304.39-2783.53304.390.13911.984
3.53X329.79-2793.53329.790.13912.984
3.53X355.19-2803.53355.190.13913.984
3.53X380.59-2813.53380.590.13914.984
5.33X010.46-3095.3310.460.210.412
5.33X012.07-3105.3312.070.210.475
5.33X013.64-3115.3313.640.210.537
5.33X015.24-3125.3315.240.210.6
5.33X016.81-3135.3316.810.210.662
5.33X018.42-3145.3318.420.210.725
5.33X019.99-3155.3319.990.210.787
5.33X021.59-3165.3321.590.210.85
5.33X023.16-3175.3323.160.210.912
5.33X024.77-3185.3324.770.210.975
5.33X026.34-3195.3326.340.211.037
5.33X027.94-3205.3327.940.211.1
5.33X029.51-3215.3329.510.211.162
5.33X031.12-3225.3331.120.211.225
5.33X032.69-3235.3332.690.211.287
5.33X034.29-3245.3334.290.211.35
5.33X037.47-3255.3337.470.211.475
5.33X040.64-3265.3340.640.211.6
5.33X043.82-3275.3343.820.211.725
5.33X046.99-3285.3346.990.211.85
5.33X050.17-3295.3350.170.211.975
5.33X053.34-3305.3353.340.212.1
5.33X056.52-3315.3356.520.212.225
5.33X059.69-3325.3359.690.212.35
5.33X062.87-3335.3362.870.212.475
5.33X066.04-3345.3366.040.212.6
5.33X069.22-3355.3369.220.212.725
5.33X072.39-3365.3372.390.212.85
5.33X074.61-6195.3374.610.212.937
5.33X075.57-3375.3375.570.212.975
5.33X078.74-3385.3378.740.213.1
5.33X079.78-6205.3379.780.213.141
5.33X081.92-3395.3381.920.213.225
5.33X085.09-3405.3385.090.213.35
5.33X088.27-3415.3388.270.213.475
5.33X089.69-6215.3389.690.213.531
5.33X091.44-3425.3391.440.213.6
5.33X094.62-3435.3394.620.213.725
5.33X097.79-3445.3397.790.213.85
5.33X100-6225.331000.213.937
5.33X100.97-3455.33100.970.213.975
5.33X104.14-3465.33104.140.214.1
5.33X107.32-3475.33107.320.214.225
5.33X109.54-6235.33109.540.214.313
5.33X110.49-3485.33110.490.214.35
5.33X113.67-3495.33113.670.214.475
5.33X116.84-3505.33116.840.214.6
5.33X117.48-8605.33117.480.214.625
5.33X120.02-3515.33120.020.214.725
5.33X120.65-8615.33120.650.214.75
5.33X123.19-3525.33123.190.214.85
5.33X123.83-8625.33123.830.214.875
5.33X126.37-3535.33126.370.214.975
5.33X127-8635.331270.215
5.33X129.54-3545.33129.540.215.1
5.33X130.18-8645.33130.180.215.125
5.33X132.72-3555.33132.720.215.225
5.33X133.35-8655.33133.350.215.25
5.33X135.89-3565.33135.890.215.35
5.33X136.53-8665.33136.530.215.375
5.33X139.07-3575.33139.070.215.475
5.33X139.7-8675.33139.70.215.5
5.33X142.24-3585.33142.240.215.6
5.33X142.88-8685.33142.880.215.625
5.33X145.42-3595.33145.420.215.725
5.33X146.05-8695.33146.050.215.75
5.33X148.59-3605.33148.590.215.85
5.33X149.23-8705.33149.230.215.875
5.33X151.77-3615.33151.770.215.975
5.33X154.94-6445.33154.940.216.1
5.33X158.12-3625.33158.120.216.225
5.33X161.29-6455.33161.290.216.35
5.33X164.47-3635.33164.470.216.475
5.33X167.64-6465.33167.640.216.6
5.33X170.82-3645.33170.820.216.725
5.33X173.99-6475.33173.990.216.85
5.33X177.17-3655.33177.170.216.975
5.33X183.52-3665.33183.520.217.225
5.33X189.87-3675.33189.870.217.475
5.33X196.22-3685.33196.220.217.725
5.33X202.57-3695.33202.570.217.975
5.33X208.92-3705.33208.920.218.225
5.33X215.27-3715.33215.270.218.475
5.33X221.62-3725.33221.620.218.725
5.33X227.97-3735.33227.970.218.975
5.33X234.32-3745.33234.320.219.225
5.33X240.67-3755.33240.670.219.475
5.33X247.02-3765.33247.020.219.725
5.33X253.37-3775.33253.370.219.975
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