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AS568 O-Ring Standard

The definitive inch-based sizing system with 400+ dash numbers, Parker-equivalent dimensions and metric cross-references.

Dash NumberID (inch)CS (inch)ID (mm)CS (mm)Groove DepthAction
AS568-0010.0290.0400.741.020.030View
AS568-0020.0420.0401.071.020.030View
AS568-0030.0560.0401.421.020.030View
AS568-0040.0700.0401.781.020.030View
AS568-0050.1010.0402.571.020.030View
AS568-0060.1140.0402.901.020.030View
AS568-0070.1450.0403.681.020.030View
AS568-0080.1760.0404.471.020.030View
AS568-0090.2080.0405.281.020.030View
AS568-0100.2390.0406.071.020.030View
AS568-0110.3010.0407.651.020.030View
AS568-0120.3640.0409.251.020.030View
AS568-0130.4260.04010.821.020.030View
AS568-0140.4890.04012.421.020.030View
AS568-0150.5510.04014.001.020.030View
AS568-0160.6140.04015.601.020.030View
AS568-0170.6760.04017.171.020.030View
AS568-0180.7390.04018.771.020.030View
AS568-0190.8010.04020.351.020.030View
AS568-0200.8640.04021.951.020.030View
AS568-0210.9260.04023.521.020.030View
AS568-0220.9890.04025.121.020.030View
AS568-0231.0510.04026.701.020.030View
AS568-0241.1140.04028.301.020.030View
AS568-0251.1760.04029.871.020.030View
AS568-0261.2390.04031.471.020.030View
AS568-0271.3010.04033.051.020.030View
AS568-0281.3640.04034.651.020.030View
AS568-0291.4890.04037.821.020.030View
AS568-0301.6140.04041.001.020.030View
AS568-0311.7390.04044.171.020.030View
AS568-0321.8640.04047.351.020.030View
AS568-0331.9890.04050.521.020.030View
AS568-0342.1140.04053.701.020.030View
AS568-0352.2390.04056.871.020.030View
AS568-0362.3640.04060.051.020.030View
AS568-0372.4890.04063.221.020.030View
AS568-0382.6140.04066.401.020.030View
AS568-0392.7390.04069.571.020.030View
AS568-0402.8640.04072.751.020.030View
AS568-0412.9890.04075.921.020.030View
AS568-0423.2390.04082.271.020.030View
AS568-0433.4890.04088.621.020.030View
AS568-0443.7390.04094.971.020.030View
AS568-0453.9890.040101.321.020.030View
AS568-0464.2390.040107.671.020.030View
AS568-0474.4890.040114.021.020.030View
AS568-0484.7390.040120.371.020.030View
AS568-0494.9890.040126.721.020.030View
AS568-0505.2390.040133.071.020.030View
AS568-1020.0490.0631.241.600.047View
AS568-1030.0810.0632.061.600.047View
AS568-1040.1120.0632.841.600.047View
AS568-1050.1430.0633.631.600.047View
AS568-1060.1740.0634.421.600.047View
AS568-1070.2060.0635.231.600.047View
AS568-1080.2370.0636.021.600.047View
AS568-1090.2990.0637.591.600.047View
AS568-1100.3620.0639.191.600.047View
AS568-1110.4240.06310.771.600.047View
AS568-1120.4870.06312.371.600.047View
AS568-1130.5490.06313.941.600.047View
AS568-1140.6120.06315.541.600.047View
AS568-1150.6740.06317.121.600.047View
AS568-1160.7370.06318.721.600.047View
AS568-1170.7990.06320.291.600.047View
AS568-1180.8620.06321.891.600.047View
AS568-1190.9240.06323.471.600.047View
AS568-1200.9870.06325.071.600.047View
AS568-1211.0490.06326.641.600.047View
AS568-1221.1120.06328.241.600.047View
AS568-1231.1740.06329.821.600.047View
AS568-1241.2370.06331.421.600.047View
AS568-1251.2990.06332.991.600.047View
AS568-1261.3620.06334.591.600.047View
AS568-1271.4240.06336.171.600.047View
AS568-1281.4870.06337.771.600.047View
AS568-1291.5490.06339.341.600.047View
AS568-1301.6120.06340.941.600.047View
AS568-1311.6740.06342.521.600.047View
AS568-1321.7370.06344.121.600.047View
AS568-1331.7990.06345.691.600.047View
AS568-1341.8620.06347.291.600.047View
AS568-1351.9240.06348.871.600.047View
AS568-1361.9870.06350.471.600.047View
AS568-1372.0490.06352.041.600.047View
AS568-1382.1120.06353.641.600.047View
AS568-1392.1740.06355.221.600.047View
AS568-1402.2370.06356.821.600.047View
AS568-1412.2990.06358.391.600.047View
AS568-1422.3620.06359.991.600.047View
AS568-1432.4240.06361.571.600.047View
AS568-1442.4870.06363.171.600.047View
AS568-1452.5490.06364.741.600.047View
AS568-1462.6120.06366.341.600.047View
AS568-1472.6740.06367.921.600.047View
AS568-1482.7370.06369.521.600.047View
AS568-1492.7990.06371.091.600.047View
AS568-1502.8620.06372.691.600.047View
AS568-1512.9240.06374.271.600.047View
AS568-1522.9870.06375.871.600.047View
AS568-1533.0490.06377.441.600.047View
AS568-1543.1120.06379.041.600.047View
AS568-1553.1740.06380.621.600.047View
AS568-1563.2370.06382.221.600.047View
AS568-1573.2990.06383.791.600.047View
AS568-1583.3620.06385.391.600.047View
AS568-1593.4240.06386.971.600.047View
AS568-1603.4870.06388.571.600.047View
AS568-1613.5490.06390.141.600.047View
AS568-1623.6120.06391.741.600.047View
AS568-1633.6740.06393.321.600.047View
AS568-1643.7370.06394.921.600.047View
AS568-1653.7990.06396.491.600.047View
AS568-1663.8620.06398.091.600.047View
AS568-1673.9240.06399.671.600.047View
AS568-1683.9870.063101.271.600.047View
AS568-1694.0490.063102.841.600.047View
AS568-1704.1120.063104.441.600.047View
AS568-1714.1740.063106.021.600.047View
AS568-1724.2370.063107.621.600.047View
AS568-1734.2990.063109.191.600.047View
AS568-1744.3620.063110.791.600.047View
AS568-1754.4240.063112.371.600.047View
AS568-1764.4870.063113.971.600.047View
AS568-1774.5490.063115.541.600.047View
AS568-1784.6120.063117.141.600.047View
AS568-2010.1710.1034.342.620.077View
AS568-2020.2340.1035.942.620.077View
AS568-2030.2970.1037.542.620.077View
AS568-2040.3600.1039.142.620.077View
AS568-2050.4230.10310.742.620.077View
AS568-2060.4860.10312.342.620.077View
AS568-2070.5490.10313.942.620.077View
AS568-2080.6120.10315.542.620.077View
AS568-2090.6750.10317.142.620.077View
AS568-2100.7380.10318.752.620.077View
AS568-2110.8010.10320.352.620.077View
AS568-2120.8640.10321.952.620.077View
AS568-2130.9270.10323.552.620.077View
AS568-2140.9900.10325.152.620.077View
AS568-2151.0530.10326.752.620.077View
AS568-2161.1160.10328.352.620.077View
AS568-2171.1790.10329.952.620.077View
AS568-2181.2420.10331.552.620.077View
AS568-2191.3050.10333.152.620.077View
AS568-2201.3680.10334.752.620.077View
AS568-2211.4310.10336.352.620.077View
AS568-2221.4940.10337.952.620.077View
AS568-2231.5570.10339.552.620.077View
AS568-2241.6200.10341.152.620.077View
AS568-2251.6830.10342.752.620.077View
AS568-2261.7460.10344.352.620.077View
AS568-2271.8090.10345.952.620.077View
AS568-2281.8720.10347.552.620.077View
AS568-2291.9350.10349.152.620.077View
AS568-2301.9980.10350.752.620.077View
AS568-2312.0610.10352.352.620.077View
AS568-2322.1240.10353.952.620.077View
AS568-2332.1870.10355.552.620.077View
AS568-2342.2500.10357.152.620.077View
AS568-2352.3130.10358.752.620.077View
AS568-2362.3760.10360.352.620.077View
AS568-2372.4390.10361.952.620.077View
AS568-2382.5020.10363.552.620.077View
AS568-2392.5650.10365.152.620.077View
AS568-2402.6280.10366.752.620.077View
AS568-2412.6910.10368.352.620.077View
AS568-2422.7540.10369.952.620.077View
AS568-2432.8170.10371.552.620.077View
AS568-2442.8800.10373.152.620.077View
AS568-2452.9430.10374.752.620.077View
AS568-2463.0060.10376.352.620.077View
AS568-2473.0690.10377.952.620.077View
AS568-2483.1320.10379.552.620.077View
AS568-2493.1950.10381.152.620.077View
AS568-2503.2580.10382.752.620.077View
AS568-2513.3210.10384.352.620.077View
AS568-2523.3840.10385.952.620.077View
AS568-2533.4470.10387.552.620.077View
AS568-2543.5100.10389.152.620.077View
AS568-2553.5730.10390.752.620.077View
AS568-2563.6360.10392.352.620.077View
AS568-2573.6990.10393.952.620.077View
AS568-2583.7620.10395.552.620.077View
AS568-2593.8250.10397.162.620.077View
AS568-2603.8880.10398.762.620.077View
AS568-2613.9510.103100.362.620.077View
AS568-2624.0140.103101.962.620.077View
AS568-2634.0770.103103.562.620.077View
AS568-2644.1400.103105.162.620.077View
AS568-2654.2030.103106.762.620.077View
AS568-2664.2660.103108.362.620.077View
AS568-2674.3290.103109.962.620.077View
AS568-2684.3920.103111.562.620.077View
AS568-2694.4550.103113.162.620.077View
AS568-2704.5180.103114.762.620.077View
AS568-2714.5810.103116.362.620.077View
AS568-2724.6440.103117.962.620.077View
AS568-2734.7070.103119.562.620.077View
AS568-2744.7700.103121.162.620.077View
AS568-2754.8330.103122.762.620.077View
AS568-2764.8960.103124.362.620.077View
AS568-2774.9590.103125.962.620.077View
AS568-2785.0220.103127.562.620.077View
AS568-2795.0850.103129.162.620.077View
AS568-2805.1480.103130.762.620.077View
AS568-2815.2110.103132.362.620.077View
AS568-2825.2740.103133.962.620.077View
AS568-2835.3370.103135.562.620.077View
AS568-2845.4000.103137.162.620.077View
AS568-3090.2750.1396.993.530.104View
AS568-3100.3500.1398.893.530.104View
AS568-3110.4250.13910.793.530.104View
AS568-3120.5000.13912.703.530.104View
AS568-3130.5750.13914.603.530.104View
AS568-3140.6500.13916.513.530.104View
AS568-3150.7250.13918.413.530.104View
AS568-3160.8000.13920.323.530.104View
AS568-3170.8750.13922.223.530.104View
AS568-3180.9500.13924.133.530.104View
AS568-3191.0250.13926.033.530.104View
AS568-3201.1000.13927.943.530.104View
AS568-3211.1750.13929.843.530.104View
AS568-3221.2500.13931.753.530.104View
AS568-3231.3250.13933.653.530.104View
AS568-3241.4000.13935.563.530.104View
AS568-3251.4750.13937.473.530.104View
AS568-3261.5500.13939.373.530.104View
AS568-3271.6250.13941.273.530.104View
AS568-3281.7000.13943.183.530.104View
AS568-3291.7750.13945.083.530.104View
AS568-3301.8500.13946.993.530.104View
AS568-3311.9250.13948.893.530.104View
AS568-3322.0000.13950.803.530.104View
AS568-3332.0750.13952.703.530.104View
AS568-3342.1500.13954.613.530.104View
AS568-3352.2250.13956.523.530.104View
AS568-3362.3000.13958.423.530.104View
AS568-3372.3750.13960.323.530.104View
AS568-3382.4500.13962.233.530.104View
AS568-3392.5250.13964.133.530.104View
AS568-3402.6000.13966.043.530.104View
AS568-3412.6750.13967.943.530.104View
AS568-3422.7500.13969.853.530.104View
AS568-3432.8250.13971.753.530.104View
AS568-3442.9000.13973.663.530.104View
AS568-3452.9750.13975.563.530.104View
AS568-3463.0500.13977.473.530.104View
AS568-3473.1250.13979.383.530.104View
AS568-3483.2000.13981.283.530.104View
AS568-3493.2750.13983.183.530.104View
AS568-3503.3500.13985.093.530.104View
AS568-3513.4250.13986.993.530.104View
AS568-3523.5000.13988.903.530.104View
AS568-3533.5750.13990.803.530.104View
AS568-3543.6500.13992.713.530.104View
AS568-3553.7250.13994.613.530.104View
AS568-3563.8000.13996.523.530.104View
AS568-3573.8750.13998.423.530.104View
AS568-3583.9500.139100.333.530.104View
AS568-3594.0250.139102.233.530.104View
AS568-3604.1000.139104.143.530.104View
AS568-3614.1750.139106.043.530.104View
AS568-3624.2500.139107.953.530.104View
AS568-3634.3250.139109.863.530.104View
AS568-3644.4000.139111.763.530.104View
AS568-3654.4750.139113.663.530.104View
AS568-3664.5500.139115.573.530.104View
AS568-3674.6250.139117.473.530.104View
AS568-3684.7000.139119.383.530.104View
AS568-3694.7750.139121.283.530.104View
AS568-3704.8500.139123.193.530.104View
AS568-3714.9250.139125.093.530.104View
AS568-3725.0000.139127.003.530.104View
AS568-3735.0750.139128.913.530.104View
AS568-3745.1500.139130.813.530.104View
AS568-3755.2250.139132.713.530.104View
AS568-3765.3000.139134.623.530.104View
AS568-3775.3750.139136.533.530.104View
AS568-3785.4500.139138.433.530.104View
AS568-3795.5250.139140.343.530.104View
AS568-3805.6000.139142.243.530.104View
AS568-3815.6750.139144.143.530.104View
AS568-3825.7500.139146.053.530.104View
AS568-3835.8250.139147.953.530.104View
AS568-3845.9000.139149.863.530.104View
AS568-3855.9750.139151.763.530.104View
AS568-3866.0500.139153.673.530.104View
AS568-3876.1250.139155.573.530.104View
AS568-3886.2000.139157.483.530.104View
AS568-3896.2750.139159.383.530.104View
AS568-3906.3500.139161.293.530.104View
AS568-3916.4250.139163.193.530.104View
AS568-3926.5000.139165.103.530.104View
AS568-3936.5750.139167.003.530.104View
AS568-3946.6500.139168.913.530.104View
AS568-3956.7250.139170.813.530.104View
AS568-4254.4750.210113.665.330.158View
AS568-4264.9120.210124.765.330.158View
AS568-4275.3490.210135.865.330.158View
AS568-4285.7860.210146.965.330.158View
AS568-4296.2230.210158.065.330.158View
AS568-4306.6600.210169.165.330.158View
AS568-4317.0970.210180.265.330.158View
AS568-4327.5340.210191.365.330.158View
AS568-4337.9710.210202.465.330.158View
AS568-4348.4080.210213.565.330.158View
AS568-4358.8450.210224.665.330.158View
AS568-4369.2820.210235.765.330.158View
AS568-4379.7190.210246.865.330.158View
AS568-43810.1560.210257.965.330.158View
AS568-43910.5930.210269.065.330.158View
AS568-44011.0300.210280.165.330.158View
AS568-44111.4670.210291.265.330.158View
AS568-44211.9040.210302.365.330.158View
AS568-44312.3410.210313.465.330.158View
AS568-44412.7780.210324.565.330.158View
AS568-44513.2150.210335.665.330.158View
AS568-44613.6520.210346.765.330.158View
AS568-44714.0890.210357.865.330.158View
AS568-44814.5260.210368.965.330.158View
AS568-44914.9630.210380.065.330.158View
AS568-45015.4000.210391.165.330.158View
AS568-45115.8370.210402.265.330.158View
AS568-45216.2740.210413.365.330.158View
AS568-45316.7110.210424.465.330.158View
AS568-45417.1480.210435.565.330.158View
AS568-45517.5850.210446.665.330.158View
AS568-45618.0220.210457.765.330.158View
AS568-45718.4590.210468.865.330.158View
AS568-45818.8960.210479.965.330.158View
AS568-45919.3330.210491.065.330.158View
AS568-46019.7700.210502.165.330.158View
AS568-46120.2070.210513.265.330.158View
AS568-46220.6440.210524.365.330.158View
AS568-46321.0810.210535.465.330.158View
AS568-46421.5180.210546.565.330.158View
AS568-46521.9550.210557.665.330.158View
AS568-46622.3920.210568.765.330.158View
AS568-46722.8290.210579.865.330.158View
AS568-46823.2660.210590.965.330.158View
AS568-46923.7030.210602.065.330.158View
AS568-47024.1400.210613.165.330.158View
AS568-47124.5770.210624.265.330.158View
AS568-47225.0140.210635.365.330.158View
AS568-47325.4510.210646.465.330.158View
AS568-47425.8880.210657.565.330.158View
AS568-47526.3250.210668.655.330.158View

AS568 FAQ

Is the Parker size chart the same as AS568?

Yes. The Parker O-ring handbook uses the same dash numbers and dimensions as the AS568 standard. There is no proprietary Parker size system for standard O-rings.

How do I correctly measure an O-ring for replacement?

Measure the inside diameter and cross-sectional diameter with a digital caliper or dial thickness gauge. Take three readings spaced 120 degrees apart and average them. Compare your results to the AS568 table to identify the dash number.

What does AS568B mean?

AS568B refers to a specific revision of the AS568 standard. For most engineering and procurement purposes, AS568 and AS568B are interchangeable when specifying standard dash sizes.

What is the largest AS568 size?

The largest standard dash number is -932 in the 500 series, with a nominal ID of 25.975 inches (659.77 mm) and a cross-section of 0.275 inch (6.99 mm). Larger sizes are available as custom or spliced rings.

Do you supply AS568 O-ring kits?

Yes. We supply AS568 assortment kits covering the most common dash numbers in the 200 and 300 series. Custom kits with specific sizes and materials are also available with no minimum order quantity.