SHOP FOR METRIC O-RINGS. , but not more than-. The flange adapters and 4 bolt flange block fittings have O-ring grooves conforming to dimensions in ISO 6162-1 and -2 (SAE J518). 1-23) 2. Polyurethane O-Rings. Static o-ring inside and outside diameters, cross-sections and other dimensions are a fundamental component of o-ring performance. Refer to our o-ring sizing charts for the most commonly used sizes around the world like; USA AS568 o-ring standard sizing chart, common metric o-ring sizing chart, Japanese JIS o-ring sizing chart, British BS o-ring sizing chart, quad-ring ® seals x-ring sizing charts,. Download it for free and enhance your knowledge of sealing technology. It is sometimes necessary to mount an O-ring in a face type groove in such a way that it cannot fall out. O-Ring Groove Design Guides O-Ring groove dimension guidelines for standard o-ring grooves, metric o-ring grooves, JIS o-ring grooves, and other o-ring gland designs. Tight-tolerance wear rings allow for a more precise fit of components, resulting in less dimensional “play. Browse design considerations and recommendations for static face seals, metric o-rings, static dovetail o-rings, static rod-piston o-rings and dynamic rod-piston o-rings. O. 1 Seal Jacket - Compound varies by design. This product guide provides sizing, housing and material details for our broad ranges of O‑ring products. NOTE: you can select your tolerance range (+/- %) in the store. AS568 Standard Inch O-Rings - Premium Grade Global Standard Metric O-Rings ISO3601 OSK™ Assorted O-Ring Kits Extruded Rubber O-Ring Cord Vulcanized O-Rings - Precision Tailored to Your Needs Olypsys® O-Ring Measurement Hydraulic Seals, Wipers, Rod Seals, Piston Seals, and Wear Rings ↪ Universal Rod/Piston U-Cups ↪ Loaded U. Dual turn rings conform to MS 28782 and match the dash numbers of an AN 6227 series of O-rings. Compare x-ring material compounds and easily order online from the world's largest x-ring inventory network. Quattro Seal grooves are also narrower due to their ability to resist “spiral failure. O. This is beneficial for special applications where the O-ring has to be fixed by the groove e. . S. Produce. As well as the chemical volume swell or shrinkage of the O. com. 6mm, 2. Radius “R” is critical. Please contact Greene Tweed engineering for help or advice if required as some applications are difficult to optimize both at ambient and operating temperatures. 003 inches, w = 1,78 ± 0,08 mm Size Nominal Size Standard O-ring Size Metric O-ring Size Only (Inches) (Inches) (millimeters) AS 568A Actual Per AS 568 A Actual Per AS 568A Uniform Dash No. Yes they are BSPP. txt) or read online for free. What's New. Metric O’ring Kits; O’ring Section Kits; Back-up Band Kit; Quad Rings Kit; Bonds Washer Constructive;Suggestions on printing an o-ring groove. Less. For O-rings with an I. Female or Tube - the O-ring groove is located in the housing or cylinder and a tube is installed through the O-ring l. These are ideal for applications with a temperature range of -100 and 500 degrees Fahrenheit. The dovetail groove construction is only recommended for O-rings with cross sections of . Parker Hannifi n Corporation • O-Ring Division I 2360 Palumbo Drive, Lexington, KY 40509 Phone: (859) 269-2351 † Fax: (859) 335-5128 1. Dovetail Grove. Markez® O-Rings FFKM. Radius “R” is critical. Learn the basics of O-Rings and Back-up Rings from Trelleborg, a leading global supplier of sealing solutions. Anwendungsparameter & Materialauswahl. Square Rings and Rubber Washers can be molded, machined, or cut cost effectively depending on the size, material, and quantity. 5"ID to 26" inside diameter on the other side. Chemraz® O. Groove fill of the installed O-ring should not be more than 85 % to. 020 0. 1mm, 5. Once you’ve found the dovetail o-ring you need, you can quickly and easily order online from the world's largest o-ring inventory network. allorings. Standard USA X-Rings sizes. BS 4518 Metric O-Rings. Reset calculator. The groove design should follow industry standards or guidelines provided by O-Ring manufacturers to achieve effective sealing in different applications. Technical Handbook O-rings Quad-Rings®/X-Rings Gland Design Static/Dynamic (METRIC) The following table shows the groove dimensions for Quad-Rings®/ X-Rings. Gland Design for Static Application for O-rings with Axial Squeeze. EPDM O-Rings. 50 1. Design Charts for Dovetail and Half-Dovetail Grooves. 003 in. With over 8,000 different O-Ring sizes in stock, we have exactly what you are looking for and we. The groove width dimensions are listed in. ANSI B27. Displays a reference value for the diameter of the non-grooved mating part that completes the seal. DESCRIPTION: 150 USA (AS568) O-RING SIZES, 1,100 TOTAL O-RINGS. Step 1. O'ring groove dimensions for static and dynamic mode. O-Ring Design Guide: 3 Ph: 08 6350 1755: Machining Specifications: O-Ring Design Guide: O-Ring Gland Types: O-rings are primarily used to prevent the loss of a fluid or gas. Make it half a hexagon, with the inside edge being vertical, and the top/bottom edges of the inside the 45°angle chamfers. (Consider a Sizing Cone for small O-Rings under 2. For reciprocating O-rings: a compression ratio of 10-20%. The Quad Ring has replaced the Square Cut in most cases. Metric O-Ring sizing is determined by the o-ring's inside diameter and cross section width. X-Rings grooves are also narrower due to their ability to resist “spiral failure” better than O-Rings. In general, Quattro Seal grooves are deeper, as less squeeze is required to affect a positive seal. Good practice is to use a back-up ring on either side of the O-ring, even though the pressure on the ring may be from one side only. Choose between more than 30 groove materials and 11 O-ring compounds! Benefit from a modern user friendly design and be guided from design rec-ommendations from info boxes. Metric O’ring Kits; O’ring Unterteilung Kits; Back-up Band Kit; Quad-a Ring Kit;. O-Rings, Rubber Seals and Custom. Worldwide unique online calculation tool taking into consideration of the thermal expansion of the construction parts and the O-Ring. The online O-Ring Calculator offers engineers and professionals a quick and easy way to calculate O-Ring dimensions and the appropriate housing layout in accordance with the international O-Ring standard ISO 3601. I have an older edition (25th). Once installed, the exposed portion acts as a shoulder which. The O-ring sits in the groove and is compressed during assembly, creating a seal. Markez® O-Rings FFKM. O-Ring Reference Number. Sealing Australia stocks a wide range of back-up rings to suit imperial and JIS metric sized o’rings. It is the most common and most widely known type of seal in use today. In the Grooves dialog box: To create an O-ring groove, click the O-Ring Grooves tab. DESCRIPTION: Contents: Razor blade, splicing and cutting tool, adhesive, one meter of each o-ring cord thickeness 1. This SAE Recommended Practice provides the design criteria for static elastomeric O-ring seals used specifically in engine and engine control systems. O’ring. The O-ring groove calculator enables engineers to specify an O-ring groove for any given O-ring or vice versa calculates the best suitable size O-ring for any given groove. Kalrez ® 6375. AS9100 / Quality Policy. 4mm, 3. Using the table above, determine the maximum recommended gland depth for your application. O-Rings METRIC 190 - 191 192 - 195 Metric O-Ring Sizes - Standard Metric O-Ring Sizes - SMS 1586 Metric O-Ring Sizes - J. This interactive tool will walk you through calculating values for diameters, compression, tolerance and more for your custom seal application. For industrial use, order the O-ring by the Parker compound number followed by the size number. Step 3. All surfaces and corners must be free of tool marks and scratches. The O-ring inner diameter (ID) should also stretch approximately 5% over your groove or gland. O-Ring Reference Number. Static o-ring inside and outside diameters, cross-sections and other dimensions are a fundamental component of o-ring performance. Back-Up Rings for AS568 O-Rings MFP Seals produces Backup rings that are designed to keep O-Rings from extruding as well as Backup rings for U-Cups applications. This metric o-ring groove design reference guide will help you find the right radius, back-up, pressure and other o-ring dimensions for basic applications. DIN 3771 Metric O-Rings. standard P. Free groove volume. O-Ring Gland Design Considerations; Static O-Ring Groove Design Face Seal; Metric O-Ring Groove Design; Static O-Ring Groove Design Rod-Piston; Dynamic O-Ring. World Class; Certifications; Contact Us; Call Us: Seal & Design Canada: Toronto, Ontario (416) 741-7005 Toll Free: 1-866-242-3770 Headquarters: Clarence, NY. D. Metric o-ring groove designs vary greatly and choosing the right one for your application is important for maximum o-ring performance. O-Ring Assembling Conditions: 162-168: 15. When looking at standard dimension for a female gland, a #142 O-ring has a rod OD of 2. 5. O-Ring Gland Design Considerations; Static O-Ring Groove Design Face Seal; Metric O-Ring Groove Design; Static O-Ring Groove Design Rod-Piston; Dynamic O-Ring Groove Design Rod-Piston; Static O. Custom o-rings are available upon request and can typically be produced within a few. O-Rings are available in various standard sizes. com. and seal in a female Metric parallel port conforming to ISO-9974-1 (DIN-3852, Part 1). In most new designs, the o. Using the table above, determine the maximum recommended gland depth for your application. These o-ring sizes are unique to Japan’s automotive, semiconductor, and manufacturing industries. H P PRESSURE (P) FROM INSIDE 1 = ‘O’ Ring I. D. Popular Sealing Material Families. Standard was developed for use in the United States, while the international community uses metric sizes. If a custom kit, please specify the sizes to be included. Chemraz® O. The Surface Finish X, groove top and bottom: For liquids X= 32 micro inches. Class B O-rings have slightly wider. X-Rings, provide greater sealing efficiency and lower friction than a traditional O-ring. AS9100 / Quality Policy. Then, calculate the O-Ring groove diameter as follows: a. ISO 3601-2. 79. 1mm, 5. com. High-durometer o-rings are better suited for higher pressures and are more resistant to extrusion. D. This is close enough to build our design around. At press time for the printing of the catalog, the following represented a complete listing of O-Ring compounds andJIS B 2401 Metric O-Rings; Parker 500 Series O-Ring Sizes; International O-Ring Size Cross Reference Table; Generic Metric O-Rings; ISO 3601 Metric O-Rings; ISO 6149 Metric O-Rings; BS 4518 Metric O-Rings; BS 1806 Metric Sizes; SMS 1586 Metric O-Rings; DIN 3771 Metric O-Rings; NF T 47-501 Metric O-Rings; Backup Ring Size. 000 in. For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart. The Parker O-Ring eHandbook is a condensed online version of the printed Parker O-Ring Handbook ORD 5700. Choose whether you are working with existing hardware or designing new hardware. Common Metric O-Ring Size Chart; British O-Ring Size Chart; Japanese JIS O-Ring Size Chart; O-Ring Groove Design Reference Guides. Select O-Ring Compounds and Order Online From the World’s Largest Inventory Network. 5 to 12. Global O-Ring and Seal, LLC is a master distributor of O-Rings, Backup Rings, X-Rings, Cord Stock, and related seals, servicing industrial distributors worldwide. L = Groove Depth + Clearance. CUSTOM KIT. 000 for all sizes + . 30 MM X 2. O-Ring Inside dia (mm - 4 digits -1 decimal place)"-" O Ring Section. greater than 250 mm, or 5% for O-rings with an I. 005 inches. 53mm. 5mm, 4. 002 for sizes 2-006 through 2-324. No less than 75% of the seal cross-section should be contained within the groove to ensure the seal does not “roll” or extrude out of the groove. • Where differing amounts of compression effect the seal function (as with flat gaskets), an O-ring is not effected because metal to metal contact is generally allowed for. Static O-Ring Sealing Parker Hannifi n Corporation • O-Ring Division 2360 Palumbo Drive, Lexington, KY 40509 Phone: (859) 269-2351 † Fax: (859) 335-5128 Parker O-Ring Handbook Industrial O-Ring Static Seal Glands O-Ring 2-Size AS568B-W Cross-Section Nominal Actual L Gland Depth Squeeze Actual % E(a) Diametral Clearance Outside diameter (O. The ERIKS O-Ring design calculator features the calculation of: for axial seals with inner or outer pressure, piston seals and rod seal applications. Standard O-Rings; Metric O-Rings; Groove Design; Order Requirements. 7 size chart. The O-ring groove calculator enables engineers to specify an O-ring groove for any given O-ring or vice versa calculates the best suitable size O-ring for any given groove. English / Metric Conversions Custom Groove Calculations AN6226 Gland Dimensions & Tolerances (Army / Nav y) MS-28776 (MS-33675) Dash Size. These use a trapezoidal-sectioned elastomeric seal which is embedded into a groove that’s cut into the stud end of the adapter fitting. It will be seen from the results plotted in Figure I (see page 3) that increasing the squeeze reduced the leak rate dramatically. O-Ring Gland Fill % O-Ring Volume) / (Gland Volume) • Gland volume vs. Ace Seal offers extensive o-ring manufacturing capabilities including a comprehensive selection of elastomers and sizes for standard imperial, metric, and special applications. The Surface Finish X, groove top and bottom: For liquids X= 32 micro inches. What's New. 225"). O-Ring Standard Size Charts . Dual turn rings conform to MS 28782 and match the dash numbers of an AN 6227 series of O-rings. Dynamic o-rings with rod and piston gland designs are used for most basic dynamic applications. Learn more about static o-ring groove design for rod, cylinder, and piston o-rings from Marco Rubber, the industry leader in standard and custom o-rings. (fig. A. ISO 6149 specifies O-Rings designed for use in Metric Tube Fittings. Sealing Australia stocks a wide range of o’rings from 40 Duro to 90 Duro. . During operation, the pressure of the medium intensifies the deformation of the O-ring and enhances the sealing function. [Small ID Encapsulated O-Ring Ovality] Available Cross Sections for Encapsulated O-Rings & Groove Design Data : CROSS SECTIONS (A) (D) (W) FEP / PFA: Inch: MM :. W. Since new designs should also try to incorporate these sizes, we offer groove design tools for static and dynamic applications. Since new designs. By simply entering installation specifications for an application, it recommends O-Ring sizes, housing layout and corresponding part. Once you find the exact metric o-ring you need, you can easily order online from the world's largest o-ring inventory network. 0mm, 4. Radius “R” is critical. In general, X-Rings grooves are deeper, as less squeeze is required to affect a positive seal. Guiding tapes 171 8. Static O-Ring Sealing Parker Hannifi n Corporation • O-Ring Division 2360 Palumbo Drive, Lexington, KY 40509 Phone: (859) 269-2351 † Fax: (859) 335-5128 Parker O-Ring Handbook 66° Mean Groove Diameter Coincides With Mean O-ring Diameter. For additional information about O-ring and back-up ring materials, refer to Materials and about extrusion, refer to Gap extrusion. Use at your own risk. Explore some of the most common sealing materials we offer here. 45 degree angle on the male cover. O-ring calculator with complete design analysis. For a rod (shaft) seal:O-Ring Max Groove Diameter = Min Shaft Diameter + (2 x Recommended Gland Depth) b. O-Ring inner diameter stretch, outer diameter squeeze. Test. 139 inch (3,53 mm) and bigger. 001 in. O-Ring & Engineered Seals. O-Ring Size Chart: 169-202: 16. The three main types of standard groove designs are Industrial Static also called Radial, Industrial Reciprocating also called Dynamic, and Face Seals also called Axial or Flange. Static Radial Glans Design Application. • Easy to use • PDF output • Saving of your designsThis table is a reference to O-ring sizes for common housing dimensions. This groove design is relatively uncommon as it is expensive to machine and should not be used unless absolutely required. Tolerances and. Learn about the factors that affect vacuum sealing performance, such as o-ring size, material, groove geometry, surface finish, and lubrication. NF T 47-501 Metric O-Rings. PART NUMBER SKU: Please choose a configuration from the list below in order to check availability and pricing: If you require options not listed online yet, please click the Request a Custom Quote button below to request an offline quote. The purpose of this chart is to specify the. Housing groove width. Due to their unique four-lobed geometry, grooves for X-Rings are different than those for O-Rings. 1-23) 2. The three main types of standard groove designs are Industrial Static also called Radial, Industrial Reciprocating also called Dynamic, and Face Seals also called Axial or Flange. 4mm. The types of sealing styles shown in DIN-3852-1 / ISO 9974 are below: 1) Type E - For fixed stud ends only. Polyurethane O-Rings. and gland — constitute the. 0mm, 5. Seal Types and Gland Design. This is a Square Style. Standard USA X-Rings sizes. Select a size to buy standard and custom o-rings from the world's largest inventory network or custom orders can be made within a few weeks, typically without tooling fees. Dimensions per AS568 although tolerances vary by use, please see our tolerance pages. An undercut or dovetail groove has proven beneficial in many applications to keep the o-ring in place. O-Ring Groove design plays an important part in how an o-ring seals. Displays a reference value for the diameter of the non-grooved mating part that completes the seal. Fittings in this section with male metric threads use a primary sealing method of an O-ring and retaining ring. This groove design is rela-tively uncommon as it is expensive to machine and should not be used unless absolutely. The groove must be designed to accommodate not just the o’ring size, but also its intended usage; be it dynamic or static operation, radial or axial loading, vacuum or high pressure. For groove sides X=63 micro inches. Markez® O-Rings FFKM. Dynamic applications: stretch a piston seal by up to 5% and compress a rod seal by up to 3%. Japanese Metric O-Rings (JIS) and Sizes. Groove Design. O-Ring Design Guides for Engineers. Technical O-ring Handbook . Metric O’ring Rigs; O’ring Section Packages; Back-up Ring Kit; Quad Ring Kit; Bonded Washer Outfit;. Sizes and How to Order. This PDF catalog covers the design, materials, installation and applications of O-Rings and Back-up Rings, with detailed illustrations and tables. Bitte beachten Sie, dass einige Ihrer ausgewählten Parameter Einfluss auf die Größenauswahl haben. Female or Tube - the O-ring groove is located in the housing or cylinder and a tube is installed through the O-ring l. This metric o-ring groove design reference guide will help you find the right radius, back-up,. 60mm. Otherwise many bad things will happen to your design. . )Metric O-Ring Groove Design; Static O-Ring Groove Design Rod-Piston; Dynamic O-Ring Groove Design Rod-Piston; Static O-Ring Groove Design Dovetail; O-RING MATERIAL GUIDES. FKM; EPDM: Peroxide-Cured vs. In static applications the recommended squeeze is usually between 15-30%. Call Go: 716-759-2222. Displays the diameter of the selected cylindrical face, or No selected diameter. and load them also into your created design. , Japanese JIS, British BS and Common Metric o-ring size charts. Experimental analysis and experience have shown that elastomer o-rings must always be smaller than the grooves they fit in. MAP3439. 091 0. 1-24). 1-23). One general guideline for good O-ring application and design is to maintain a range of % sqeeze on the O-ring (~10-40% for static and no more than 30% for dynamic). O. Explore some of the most common sealing materials we offer here. Metric O-Rings. Dual turn rings conform to MS 28782 and match the dash numbers of an AN 6227 series of O-rings. 000 for all sizes + . O-ring sire. Quick reference guide training video to assist users in properly using the Parker O-Ring Handbook in selecting, sizing, installing and using o-rings. Metric and Inch Cross Section thickness reference gauge. For turning 24° o-ring dovetails;. See below for our entire list of beveled retaining ring dimensions and configuration drawings. The conditions considered to formulate the design criteria are also described, e. Select the type of O-ring groove - piston, rod, face seal or trapped seal. B2401 Metric O-Ring Sizes - BS4518 Metric O-Ring Sizes - GB/T 3452. Highly printable, and will still capture the oring. The following information is a guide for o’ring. This recommended practice provides the design criteria for static elastomeric O-ring seal applications, axial compression (face type) groove dimensions for aerospace metric O-ring sizes specified in MA2010. Standard-sized O-rings are readily available in the following materials: Black Nitrile (Buna-N) 70 or 90, Brown or Black Viton® 75, Black EPDM 70, Red Silicone 70, Black Neoprene 70, and White PTFE. Standard Size Charts for Quad-Ring® Seals and X-Ring Seals. Cross Section & Groove Design Data. BS 4518:1982 Specification for metric dimensions of toroidal sealing rings ('O'-rings) and their housings. This metric o-ring groove design reference guide intention help you find the right radius, back-up, pressure and sundry o-ring dimensions for basic applications. PRODUCT CLASS: X-RING KIT USA COMMON SIZES. Use this tool for designing new glands based upon desired o-ring sizing. (figure 3) Boss Seals The O-ring is used for sealing straight thread tube fittings in a boss. It is an O-ring face seal type fitting that consists of a nut, a body, an O-ring and a sleeve. Since axial, radial and flange applications. We have included Static, dynamic, and pneumatic applications. 49 MM FPM 75: METRIC O-RING . I. The 4 bolt flange block fittings have through holes for the mounting bolts, again. O-Ring Metric Groove Design [PDF] See full list on globaloring. Lexington, KY 40509. The O-ring calculator tool is intended to form the basis of an o-ring installation, and assist with selection of o-ring and hardware dimensions. O-Ring Metric Groove Design [PDF] Seal & Design Company Info. 1 OR O-rings in static radial sealing, metric sizes ID 2,9 – 17,3 mm Dimensions Dash-number Designation Outside groove Inside groove ID CS L R D d 1 d D 1 +0,2 max. The groove design allows the O-ring to be retained in the face seal during assembly and maintenance. For axial, radial and flange applications. Metric O-Ring Size Cross Reference Table. 060 Tolerance = Minus 1% of Mean For External Pressure (inward pressure direction) dimension the groove by itsDepending upon the direction of pressure in the sealing application, you can either use one backup ring or two backup rings. com Author: seal and design Designing the parts of an application where o-rings will be applied is broadly termed “o-ring groove design”. Metric. D. D. Viton® O-Rings FKM. O-Ring Gland Design Considerations; Static O-Ring Groove Design Face Seal; Metric O-Ring Groove Design; Static O-Ring Groove Design Rod-Piston; Dynamic O-Ring Groove Design Rod-Piston; Static O. Kalrez® O-Rings FFKM. = B Min. Fluorosilicone O-Rings FVMQ. com. O-Ring volume • About 25% void space or 75% nominal fill • Need space in groove to allow for volume swell, thermal expansion, and increasing width due to squeeze • Narrower groove for sealing vacuum or gas • O-Ring can extrude into clearance gap or get squeezed in. thermal expansion of the groove and the O-ring. To view the size tolerances for the o-rings we sell, please refer to either the AS568 Size Chart for American Standard Sizes, or our Metric O-Ring Tolerances page for all other “metric” o-rings. Dimensional tolerances for all AS568 o-rings offered by Global O-Ring and Seal are in accordance with ISO 3601-1A. Surface Finish X groove top and bottom : for liquids X = 32 micro inches (0. Transeals O-Ring Handbook - Free download as PDF File (. Metric-sized O-rings are readily available in the following material’s minimum: Black Nitrile (Buna-N) 70 and Black Viton® 75. Mil. Learn More > Contact. Seal Types and Gland Design. A2, the tube is flanged to 90° (or the tube mayThe Japanese valves I've worked on are almost exclusively o-ring only, similar to an o-ring boss fitting, just metric. One of the keys to creating a functional o-ring seal involves evaluation of o-ring volume and groove volume. O-Ring Gland Design Considerations; Static O-Ring Groove Design Face Seal; Metric O-Ring Groove Design; Static O-Ring Groove Design Rod-Piston; Dynamic O-Ring Groove Design Rod-Piston; Static O. PART NUMBER SKU: Please choose a configuration from the list below in order to check availability and pricing: If you require options not listed online yet, please. Once you find the exact metric o-ring you need, you can. Suggestions on printing an o-ring groove. O-rings are manufactured according to metric and imperial international standards such as AS-568B, DIN ISO 3601 and JIS. O-ring Groove Design in 3 easy steps: Step 1. Ph: 859-269-2351. Learn More > Contact. To facilitate assembly, the diameter of the O-ring groove is usually selected somewhat larger than the diameter of the O-ring. Hydraulic sealing solutions for fluid power applications have become a priority in our continued product offering. 06 - Multi Reach Grooving Tools. O-Ring Seals Groove Diameter (Rod Gland) Tolerance - . Common Metric O-Ring Size Chart; British O-Ring Size Chart; Japanese JIS O-Ring Size Chart; O-Ring Groove Design Reference Guides. Calculate the Quad-Ring® Brand groove dimensions. Square Rings can be used in static applications where high sealing load force is required or when the sealing area is too thin to accommodate anything else. Please note that no tolerances or materials are taken into consideration in this cross-reference chart. Select a standard, groove type, and available groove size from the lists on the top left of the tab. To accommodate the additional back-up rings, the O-ring groove width L needs to be increased to L1 for one back-up ring or L2 for two back-up rings . 27 - O-Ring Groove Tools. O-Ring Groove Design. (A) is shown as a radius rather than a diameter. dovetail groove 46 Dynamic seal – hydraulic 49 Sizing charts 50 2-xxx sizes. Polyurethane O-Rings. O’ring Groove Design. 383. Use at your own risk. 6mm, 2. If the O-ring size required is known, simply select the AS, BS or ISO standard (such as AS568) and enter the dash size reference. To accommodate the additional back-up rings, the O-ring groove width L needs to be increased to L1 for one back-up ring or L2 for two back-up rings . , seal stretch, cross-section reduction, squeeze, and swell. Backup Ring Size Chart.