Calculate the Quad-Ring® Brand groove dimensions. (A) is shown as a radius rather than a diameter. An O-ring groove is a circular cross-sectioned recess in a housing or mechanical device designed to hold an O-ring seal. Phone: (716) 684-6560 Fax: (716) 684-8302 E-mail: info@applerubber. Loaded U-Cups, Non loaded U-Cups, Hydraulic or Pneumatic U-Cups We make getting U-Cups easy! MUU Symmetrical. Includes Ring and groove design data, groove dimensional and tolerance information. METRIC. Standard O-Rings; Metric O-Rings; Groove Design; Order Requirements. • Easy to use • PDF output • Saving of your designsThis table is a reference to O-ring sizes for common housing dimensions. EPDM O-Rings. 1. ISO 6149 Metric O-Rings. English / Metric Conversions Custom Groove Calculations AN6226 Gland Dimensions & Tolerances (Army / Nav y) MS-28776 (MS-33675) Dash Size. 53mm) and bigger. This product guide provides sizing, housing and material details for our broad ranges of O‑ring products. 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. Select a standard, groove type, and available groove size from the lists on the top left of the tab. Once you locate the. Seal Types and Gland Design. I. MS 28783 back-up rings match the dash numbers an AN 6230 O-rings. Common Metric O-Ring Size Chart; British O-Ring Size Chart; Japanese JIS O-Ring Size Chart; O-Ring Groove Design Reference Guides. Worldwide unique online calculation tool taking into consideration of the thermal expansion of the construction parts and the O-Ring. Non-standard sizes and sections can be manufactured to order with a capabiliity to mould join. O-ring sire. AS9100 / Quality Policy. 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. THE O-RING EXAMPLE Throughout this guide, the o-ring is used as an example in our discussion of seal design principles. Insufficient radius will potentially cause damage to the o-ring during installation, while excessive radius may contribute to. Less. This recommended practice provides the design criteria for static elastomeric O-ring seal applications, radial squeeze groove dimensions for aerospace metric O-ring seal sizes as specified in MA2010. 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. High. O-Ring Assembling Conditions: 162-168: 15. • They are cost-effective. It is used in all types of applications and by a broad range of industries. For additional information about O-ring and back-up ring materials, refer to Materials and about extrusion, refer to Gap extrusion. Sealing Elements Technical Handbook O-rings 1 All the information in this documentation has been compiled with the greatest of care. Viton® O-Rings FKM. 005 inches. Chemraz® O-Rings FFKM. Dynamic o-rings are diverse, providing a wide range of uses, and selecting the right one for your application is key for achieving maximum o-ring performance. H9 h11 f8 H11 mm – – R CS ID L d1 D R L d D1 Outside groove Inside groove 300 Dovetail grooves are used to hold the O-ring in place during installation or maintenance. Gland Depth x Groove Width (area of the gland) must be larger than the cross section area of the o-ring. O-rings are manufactured according to metric and imperial international standards such as AS-568B, DIN ISO 3601 and JIS. 003 in. 4mm. The Japanese Industrial Standard (JIS B 2401) contains three groups; aerospace group, general purpose group, and traditional group. Bore. For axial, radial and flange applications. The metric sizes are further broken down by region, notably Europe and Japan. What's New. Silicone Parts and Seals. Sealing Australia stocks a wide range of o’rings from 40 Duro to 90 Duro. EPDM O-Rings. Our tolerances are only meant to serve as a guide. CPD# or Material Description (Durometer, Color & Other Attributes) *. The groove width dimensions are listed in. Moreover, the diameter of the O-ring is intentionally kept slightly larger than the depth of the O-ring groove size, which causes it to extend beyond the mating surface. • Easy to use • PDF output • Saving of your designsStandard-tolerance wear rings have a radial wall tolerance that is held to ±. Sizes and How to Order. Since axial, radial and flange applications. D. Bitte beachten Sie, dass einige Ihrer ausgewählten. BOSS SIZE KIT (20 BOSS SIZES 212PCS. O-Ring Gland Design Information: 131-161: 14. O-Ring Groove design plays an important part in how an o-ring seals. Learn More > Contact. The right combination of x-ring material and x-ring groove design will maximize sealing performance life. But encapsulated PTFE has significant surface wear and showcases abrasion and wear resistance. View our size chart. A “metric o-ring” simply means that the size of the o-ring is defined in millimeters. Ph: 859-269-2351. For a rod (shaft) seal: Quad-Ring® Brand Groove Diameter = Min Shaft Diameter + (2 X Recommended Gland Depth) b. We carry a full range of AS568 standard sizes, as well as metric sizes. The groove design should follow industry standards or guidelines provided by O-Ring manufacturers to achieve effective sealing in different applications. Dual turn rings conform to MS 28782 and match the dash numbers of an AN 6227 series of O-rings. THE O-RING EXAMPLE Throughout this guide, the o-ring is used as an example in our discussion of seal design principles. Technical Handbook O-rings Standard O-ring Sizes (000 Series 004 to 050 cross section Diameters w = . Sulfur-Cured; O-Ring Shelf Life; O-Ring Groove Design; O-Ring Weight Calculator. Finishes are RMS values L G R R 1 O-Ring Dovetail Grooves Radius “R” is CRITICAL. We have the largest selection of o-rings in all materials and styles ranging from standard o-rings to metric o-rings. Additional sealing methods such as a cutting face or an EOlastic seal are also available on other fittings within the catalog. If you have a custom O-ring size that does not appear on this chart, contact us. Thousands of common metric o-rings and non-standard o-rings in metric sizes are available in stock. Explore some of the most common sealing materials we offer here. 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 . When looking at standard dimension for a female gland, a #142 O-ring has a rod OD of 2. A. NF T 47-501 Metric O-Rings. Parbaks are not available in standard for metric sizes. Metric and Inch Cross Section thickness reference gauge. O’ring Groove Design; O’ring Sizing; Cat D Rings; BSM O’Rings & Milk O’Rings; O’ring Cord;. BS 4518 Metric O-Rings. Yes they are BSPP. Displays the diameter of the selected cylindrical face, or No selected diameter. Groove Design. 30 MM X 2. Otherwise many bad things will happen to your design. These o-ring sizes are unique to Japan’s automotive, semiconductor, and manufacturing industries. Bitte beachten Sie, dass einige Ihrer ausgewählten Parameter Einfluss auf die Größenauswahl haben. Pushing the Boundaries of Seal Design for 50 Years. Custom sizes of almost any dimension are possible, such as miniature O-rings, special O-rings with large dimensions and continuously molded and spliced cord. D. The metric sizes are further broken down by region, notably Europe and Japan. Flat Round Non-Metallic Washers; Insulator Gaskets; Custom Gaskets;. This is also the case when placing an item inside another item and utilising the o-ring as the final sealant. ISO 3601-1 states two classes of O-rings: Class A and Class B. For more information on o-ring groove design, click here. O‑ring product guide. smaller than 20 mm, this is not always possible due to tolerance issues, which can result in a greater O-ring O. O-Ring Cross Section. >>>>> Last edited: Apr 8, 2020. Static applications: stretch the diameter by up to 5% and compress by up to 3%. The design of the groove where the o-ring sits plays a major role in how the o. (Premium Membership required) Preview: Groove design for o. Standard O-Rings Outside diameter (O. Our groove design chart is a useful aid for selecting the right metric O. DIN 3771 Size Chart. 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. JIS O-Ring Groups. The design of the groove where the o-ring sits plays a major role in how the o-ring performs its sealing. Parker Seal-Lok fittings feature a captive O-ring groove. O-Ring Sizing Guides. O-Ring Size Charts O-ring, x-ring and square ring size charts. 6mm, 2. Recommendations are based on available technical information, and are offered as suggestions only, any reliance placed on such information by the user is strictly at the user’s risk. Use the metric o-ring size chart to find common metric o-ring sizes by cross section, inside diameter, and outside diameter. 3 O-Ring Glands for Pneumatic Floating Piston Ring Seals Design Chart 5-3 provides the basis for calculating gland. O-Rings. The Surface Finish X, groove top and bottom: For liquids X= 32 micro inches. We have included Static, dynamic, and pneumatic applications. 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. ” This allows the extrusion gap to be smaller for tight-tolerance wear rings, thusPTFE Seal Design Guide Parker Hannifin Corp. CS=1. 0mm, 5. Business-to-business sales only. Common Metric O-Ring Size Chart; British O-Ring Size Chart; Japanese JIS O-Ring Size Chart; O-Ring Groove Design Reference Guides. This chart shows all of the common international size standards and allows you to cross reference with other standards. 5-30 Parker Hannifi n Corporation • O-Ring Division 2360 Palumbo Drive, Lexington, KY 40509 Phone: (859) 269-2351 † Fax: (859) 335-5128 Dynamic O-Ring Sealing Parker O-Ring Handbook Gland Dimensions for Industrial Reciprocating O-Ring Seals Groove Diameter (Rod Gland) Tolerance - . The only time you Calculate the O-Ring groove dimensions. As important as the o’ring seal itself is the groove that the o’ring seats into. Note 1. L = Gland Depth. 79. Sealing Australia stocks a wide range of back-up rings to suit imperial and JIS metric sized o’rings. 139 inch (3,53 mm) and larger. Female or Tube - the O-ring groove is located in the housing or. The most common hardness found is 70 Durometer. View our o-ring groove design guidelines here. O-Ring Groove (Gland) Design Guide. 5X1. EPDM O-Rings. 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. ") for the O-ring than that of the O-ring's ID (6. You can also look up charts for metric O rings where a 1mm does actually measure 1. Choose whether you are working with existing hardware or designing new hardware. Polyurethane O-Rings. Our groove design chart is a useful aid for selecting the right metric O-ring groove dimensions for your design. Whether you need high temperature o-rings, low temperature o-rings, high pressure o-rings, or o-rings with excellent chemical resistance. We have included Static, dynamic, and. 1-23). g. Discover all CAD files of the "O-Ring Groove Design according Cross Section" category from Supplier-Certified Catalogs SOLIDWORKS, Inventor, Creo, CATIA, Solid Edge, autoCAD, Revit and many more CAD software but also as STEP, STL, IGES, STL, DWG, DXF and more neutral CAD formats. g. We're proud to offer the world's largest inventory of readily-available and highly customized sealing solutions. Standard Size Charts for Quad-Ring® Seals and X-Ring Seals. com O-Ring Products. Learn more about O-Ring sizes with the links below. Standard O-Rings; Metric O-Rings; GASKETS. For O-rings with an I. O-Ring Sizing Charts USA AS568 Parker O-Ring Size Chart, X. O-ring kits and accessories optimize the sealing performance of o-rings in a wide range of applications. I have an older edition (25th). Quad™-rings Gland Design Static/Dynamic (METRIC) The following table shows the groove dimensions for Quad™-rings. ) is for reference only. 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. O-Ring Selection; Bitte definieren Sie die Anwendungsparameter und wählen Sie ein Dichtungsmaterial aus. We carry a full range of AS568 standard sizes, as well as. Metric o-ring groove dimensions are listed for the most common metric cross sections with and without backup rings. Test. Fluorosilicone O-Rings FVMQ. Once thee find the concise metric o-ring him need, you can easily order online from the world's largest o-ring inventory network. The groove width dimensions are listed in. 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. The angled face must face to the inside of the groove for it to retain the o-ring when the o-ring is streched into the groove. The chart below lists all of these sizes with their corresponding dimensions in inches and millimeters for easy identification. standard P. 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-Ring Groove Design. 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. 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. com. Standard O-Rings; Metric O-Rings; GASKETS. O-Rings are specified by I. In order to seal properly, the o-ring has to deform in the application by being compressed and stretched in any number of ways. O-ring groove design is a key consideration in the o-ring selection process. The thread relief of the pin thread is approximately 2. Select the type of O-ring groove - piston, rod, face seal or trapped seal. 1mm, 5. Fluorosilicone O-Rings FVMQ. CPD# T1002 is FEP encapsulated Solid. Worldwide O-Ring inventory network available online, manufacturer direct pricing with same day shipping. 383. Our o-ring groove design guides list default o-ring groove dimensions for the most basic applications and are intended to be used with the following o-ring groove design considerations to engineer on o-ring gland to optimize specific. For standard O. Create a sketch on the new Workplane and create an arc. Established in 1989 by Dean T. (fig. After Hourly ServiceTimelord (Mechanical) 15 Dec 08 16:29. Metric o-ring groove designs vary greatly and choosing the right one for your application is important for maximum o-ring performance. Using the table above, determine the maximum recommended gland depth for your application. Dynamic O-Ring Sealing Parker Hannifin Corporation O-Ring Division 2360 Palumbo Drive, Lexington, KY 40509 Phone: (859) 269-2351 • Fax: (859) 335-5128 Parker O-Ring Handbook 5. For standard sizes, aerospace standard AS568 and ISO 3601 for metric sizes are used to give the dimension and tolerance. According to BS4518 the O-Ring reference number =. 0mm, 4. They are one of the most common and important elements of machine design. EPDM O-Rings. Markez® O-Rings FFKM. free. Select the type of O-ring groove - piston, rod, face seal or trapped seal. O-Ring dimension for metric thread with conical. Simriz® SZ485. 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. Peter Twissell Well-Known Member HMEM Supporting Member. W Cross section Typical Radial Installation - Dynamic and Static. 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. Readily available is common USA and metric cross-sections and nearly unlimited diameters. Tight-tolerance wear rings allow for a more precise fit of components, resulting in less dimensional “play. Standard was developed for use in the United States, while the international community uses metric sizes. thermal expansion of the groove and the O-ring. Experimental analysis and experience have shown that elastomer o-rings must always be smaller than the grooves they fit in. 4mm. For rotary O-rings: a compression ratio of 0-10%. Durometer (shore A) 76. Make sure that the material you choose will withstand the temperature of your system by going to this rubber temperature range chart. /-0. O-Ring Groove Design; O-Ring Weight Calculator; Vulcanized O-Ring Calculator; Causes for O-Ring Failure;. Gland Depth x Groove Width (area of the gland) must be larger than the cross section area of the o-ring. Learn about the factors that affect vacuum sealing performance, such as o-ring size, material, groove geometry, surface finish, and lubrication. O-ring selection is based on chemical compatibility, application temperature, sealing pressure, lubrication requirements, durometer, size and cost. Markez® O-Rings FFKM. Markez® O-Rings FFKM. O-ring groove design is a key consideration in the o-ring selection process. 3. CUSTOM KIT. 1 Seal Jacket - Compound varies by design. Find AS568 o-ring standard sizes by cross section, inside diameter and outside diameter in our o-ring size chart and separate o-ring tolerance chart. The O-Ring is one of the most basic and functional seals ever made and is the backbone to all the hydraulic and sealing applications in the world. L = Groove Depth + Clearance. Consider replacing Rubber Square-Rings with O. 30BARNWELL ‘O’ RINGS Telephone +44(0)121 429 8011 (20 lines) Fax +44(0)121 434 3016 Website 5 D 2 = ‘O’ Ring O. 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. Polyurethane O-Rings. To create a retaining-ring groove, click the Retaining Ring Grooves tab. . DIN 3771 Metric O-Rings. ) and includes the Extended Sizes in the 400 Series. Standard USA X-Rings sizes. Male or Plug - the O-ring groove is located on a plug which is inserted into the housing or cylinder (fig. )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. A. D. Housing groove width. deeper than the maximum radial. Phone: (716) 684-6560 Fax: (716) 684-8302 E-mail: [email protected] O-Ring & Retaining Ring For ISO 9974-1 / DIN 3852-1Port Specify size and compound Example: 2-012 N0552 (standard NBR O-ring) M12RR (standard steel retaining ring) * N0552 is the standard compound — 90-durometer Nitrile (NBR). For turning 24° o-ring dovetails;. 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. O-Rings, Rubber Seals and Custom. O’ring Groove Design; O’ring Sizing; Cat D Rings; BSM O’Rings & Milk O’Rings; O’ring Cord; Quad Rings / Xrings; End Caps & Cover Seals; Gamma Seals & Axial Seals;. Hard material yields higher pressure required to force the o-ring into extruding. O-Ring Assembling Conditions: 162-168: 15. However, this is an expensive. S. O-Ring Design Guides for Engineers. Static applications: stretch the diameter by up to 5% and compress by up to 3%. PRODUCT CLASS: X-RING KIT USA COMMON SIZES. O-Rings Design Guidelines, Specifications, Materials An O-ring , also known as a packing , is a flexible gasket in the shape of a loop; it is a elastomer with a round cross-section designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. An O-ring groove is a circular cross-sectioned recess in a housing or mechanical device designed to hold an O-ring seal. This PDF catalog covers the design, materials, installation and applications of O-Rings and Back-up Rings, with detailed illustrations and tables. Our ranges of O-rings include metric sizes and inch sizes to a range of international, national and industry standards. This keeps the O-ring in the groove during assembly. In order to seal properly, the o-ring has to deform in the application by being compressed and stretched in any number of ways. Modifications to. Parker Hannifin has established the 5-XXX series for a number of commonly used o-rings sizes which do not fall in the AS568 line of o-rings and are also not true “metric” sizes. 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. Gland design guideline The data in this website are found to be useful to us. Reset calculator. Dual turn rings conform to MS 28782 and match the dash numbers of an AN 6227 series of O-rings. Chemraz® O-Rings FFKM. E. Polyurethane O-Rings. When to use PTFE seals 7 3. 1-23) 2. Standard was developed for use in the United States, while the international community uses metric sizes. The guidelines are for the nominal condition. Replace current O-ring with a harder O-ring. After you. Custom o-rings are available upon request and can typically be produced within a few. Hard material yields higher pressure. Make it half a hexagon, with the inside edge being vertical, and the top/bottom edges of the inside the 45°angle chamfers. D. to O-ring groove, bolt holes and bolt pattern dimensions of either Code 61 or Code 62 of SAE J518 and ISO 6162-1 or ISO 6162-2. Design Chart 5-2-b: Design Chart for Industrial Dynamic Metric Cross-Sections. (0. As well as the chemical volume swell or shrinkage of the O. An O-ring. February 14, 2013. Cross Section & Groove Design Data. 1-23) 2. Class B O-rings have slightly wider. G = Groove Width. 4 PTFE Seal Design Guide Parker. O-Ring groove and dimensions may be calculated as follows (please refer to chart above) Given: Example. This dynamic o-ring groove design guide for rod and piston glands will help you find the. O-Rings are available in a wide range of. Fig. Experimental analysis and experience have shown that elastomer o. 367 sizes and follows ISO 3601-1 very closely (with a few extra sizes). USA Square Ring Size Chart; Common Metric O-Ring Size Chart; British O-Ring Size Chart; Japanese JIS O-Ring Size Chart; O-Ring Groove Design Reference Guides. These o-rings have non-stick characteristics with a shallow friction surface ideal for high temperatures. 00 mm per. Quattro Seal grooves are also narrower due to their ability to resist “spiral failure. For additional information about O-ring and back-up ring materials, refer to Materials and about extrusion, refer to Gap extrusion. Then, calculate the O-Ring groove diameter as follows: a. Suggestions on printing an o-ring groove. O-Ring Inside dia (mm - 4 digits -1 decimal place)"-" O Ring Section. A. com Online: applerubber. Seal & Design Canada: Toronto, Ontario (416) 741-7005 Toll Free: 1-866-242-3770Common Metric O-Ring Size Chart; British O-Ring Size Chart; Japanese JIS O-Ring Size Chart; O-Ring Groove Design Reference Guides. 5"ID to 26" inside diameter on the other side. BS 1806 Metric Sizes. A1 — Captive O-ring Groove (CORG) Cutaway with Parker's trap seal Seal-Lok Introduction The Seal-Lok fitting meets or exceeds the strict requirements of SAE J1453 and ISO 8434-3. 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. The groove design allows the O-ring to be retained in the face seal during assembly and maintenance. This ha. 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. Browse design. O-ring sire. ** V0894 is an optional 90-durometer fluorocarbon compound. D. Dovetail grooves are used to hold the O-ring in place during installation or maintenance. dynamic seal design and o-ring failure modes. Then, calculate the Quad-Ring® Brand groove diameter as follows: a. Standard and Metric Sizes ; Thousands of materials ; Find O-rings by size, temperature range, material type, compliance, and more ;For additional information about O-ring and back-up ring materials, refer to Materials and about extrusion, refer to Gap extrusion. com View basic o-ring design guides for grooves, glands, depth, width, clearance, stretch, squeeze and more from Marco Rubber O-Ring specialists and buy online O-ring groove design is a key consideration in the o-ring selection process. 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. Polyurethane O-Rings. This recommended practice provides the design criteria for static elastomeric O-ring seal applications, axial compression (face type) groove dimensions. Our Office is Closed for the Day. g. and cut both sides of the groove with the same tool. 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. Since new designs should also try to incorporate these sizes, we offer groove design tools for static and dynamic applications. 1; 2; 3;O-Ring Groove Design.