Call Now: 716-759-3344 Home Products About News Technical Contact Employment Home » Technical » O-Ring Sizes O-Ring Size & Dimension Charts Standard and Metric O-Rings Dimensions Contact Us For Assistance Or Samples Click Here and contact us today to receive a free quote or if you have any questions regarding sizing. × There are two main o-ring sizing types: standard and metric. Standard was developed for use in the United States, while the international community uses metric sizes. The metric sizes are further broken down by region, notably Europe and Japan. Learn more about O-Ring sizes using the links below to explore their dimensions in an interactive chart. Standard AS-568B Japanese Metric O-Rings (JIS) European Metric O-Rings (DIN) Seal & Design has all these sizes and more. We can provide virtually any required size. EXTRUSION LIMITS & O-RING CLEARANCE GAPS The standard sizes used by O-ring manufacturers in the United States are defined by Aerospace Standard AS568B, Aerospace Size Standard for O-rings. That document, published by the Society of Automotive Engineers (SAE), lists the sizes of O-rings in six series or groups in both inches and millimeters. The first five series are based on cross-sectional diameter. The sixth series includes 20 sizes for boss seals. The standard sizes are also used for most military specifications. Cross-sectional diameters range from 0.040 to 0.275 inch. Inside diameters range from 0.029 to 25.940 inches. There are 369 standard sizes. View AS568B Sizes METRIC O-RING SIZES Standard metric sizes for O-rings are defined by International Standard ISO 3601-1:2002: Fluid power systems O-rings Part 1: Inside diameters, cross-sections, tolerances and size identification code. That standard groups metric sizes into two series, G and A. The G series is used for general purpose applications and includes a wide range of inside diameters. The A series is used for aerospace applications where tighter tolerances are recommended. The G series has 445 sizes and the the A series has 383 sizes. Currently, ISO sizes do not use a dash numbering system like the Aerospace Standard. ISO cross-sectional diameters differ from the Aerospace Standard by less than 0.001 inch. Therefore, many AS568B sizes are interchangeable with an ISO size. Be sure to consult ISO 3601-1 for specific dimensions, as inside diameters may differ. View Japanese Metric Sizes (JIS) View European Metric Sizes (DIN) O-Ring Size Chart for AS568 Standard O-Ring Dimensions Contact Us For Assistance Or Samples Click Here and contact us today to receive a free quote or if you have any questions regarding sizing. × The standard sizes used in the United States are defined by Aerospace Standard AS568B, Aerospace Size Standard for O-rings. That document, published by the Society of Automotive Engineers (SAE), lists the sizes of O-rings in six series or groups in both inches and millimeters. The first five series are based on cross-sectional diameter. The sixth series includes 20 sizes for boss seals. The standard sizes are also used for most military specifications. Cross-sectional diameters range from 0.040 to 0.275 inch. Inside diameters range from 0.029 to 25.940 inches. There are 369 standard sizes. ID Inside Diameter OD Outside Diameter CS Cross Section .070″ .103″ .139″ .210″ .275″ Here is an interactive chart for standard o-ring dimensions. Show 10 25 50 100 entries Search: AS 568B Number ID - Nominal Inches OD - Nominal Inches CS - Nominal Inches ID - Actual Inches CS - Actual Inches ID - Actual Millimeters CS - Actual Millimeters -001 1/32 3/32 1/32 .029+/-.004 .040+/-.003 0.74+/-0.10 1.02+/-0.08 -002 3/64 9/64 3/64 .042+/-.004 .050+/-.003 1.07+/-0.10 1.27+/-0.08 -003 1/16 3/16 1/16 .056+/-.004 .060+/-.003 1.42+/-0.10 1.52+/-0.08 -004 5/64 13/64 1/16 .070+/-.005 .070+/-.003 1.78+/-0.13 1.78+/-0.08 -005 3/32 7/32 1/16 .101+/-.005 .070+/-.003 2.57+/-0.13 1.78+/-0.08 -006 1/8 1/4 1/16 .114+/-.005 .070+/-.003 2.90+/-0.13 1.78+/-0.08 -007 5/32 9/32 1/16 .145+/-.005 .070+/-.003 3.68+/-0.13 1.78+/-0.08 -008 3/16 5/16 1/16 .176+/-.005 .070+/-.003 4.47+/-0.13 1.78+/-0.08 -009 7/32 11/32 1/16 .208+/-.005 .070+/-.003 5.28+/-0.13 1.78+/-0.08 -010 1/4 3/8 1/16 .239+/-.005 .070+/-.003 6.07+/-0.13 1.78+/-0.08 -011 5/16 7/16 1/16 .301+/-.005 .070+/-.003 7.65+/-0.13 1.78+/-0.08 -012 3/8 1/2 1/16 .364+/-.005 .070+/-.003 9.25+/-0.13 1.78+/-0.08 -013 7/16 9/16 1/16 .426+/-.005 .070+/-.003 10.82+/-0.13 1.78+/-0.08 -014 1/2 5/8 1/16 .489+/-.005 .070+/-.003 12.42+/-0.13 1.78+/-0.08 -015 9/16 11/16 1/16 .551+/-.007 .070+/-.003 14.00+/-0.18 1.78+/-0.08 -016 5/8 3/4 1/16 .614+/-.009 .070+/-.003 15.60+/-0.23 1.78+/-0.08 -017 11/16 13/16 1/16 .676+/-.009 .070+/-.003 17.17+/-0.23 1.78+/-0.08 -018 3/4 7/8 1/16 .739+/-.009 .070+/-.003 18.77+/-0.23 1.78+/-0.08 -019 13/16 15/16 1/16 .801+/-.009 .070+/-.003 20.35+/-0.23 1.78+/-0.08 -020 7/8 1 1/16 .864+/-.009 .070+/-.003 21.95+/-0.23 1.78+/-0.08 -021 15/16 1 1/16 1/16 .926+/-.009 .070+/-.003 23.52+/-0.23 1.78+/-0.08 -022 1 1 1/8 1/16 .989+/-.010 .070+/-.003 25.12+/-0.25 1.78+/-0.08 -023 1 1/16 1 3/16 1/16 1.051+/-.010 .070+/-.003 26.70+/-0.25 1.78+/-0.08 -024 1 1/8 1 1/4 1/16 1.114+/-.010 .070+/-.003 28.30+/-0.25 1.78+/-0.08 -025 1 3/16 1 5/16 1/16 1.176+/-.011 .070+/-.003 29.87+/-0.28 1.78+/-0.08 Showing 1 to 25 of 369 entries PreviousNext Seal & Design Company Info Locations Headquarters: Clarence, NY (716) 759-3344 Info@SealAndDesign.com Higbee Division: Syracuse, NY (315) 432-8021 HB.Info@SealAndDesign.com Seal & Design Canada: Toronto, Ontario (416) 741-7005 Toll-Free: 1-866-242-3770 ca.Gasket@SealAndDesign.com Tools & Support About Seal & Design Contact Us Locations Employment Quality World-Class Products O-Rings Gaskets Seals Molded Products Vapor Membranes EMI/RFI Loctite Thermal Material Product Info Technical Info Additional Resources Supplier Portal Orders Portal Outlook Online Employee Password Reset © Seal & Design Inc. 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