A nominal compression value is requested since the o-ring is designed for a specific groove and optimum conditions can be chosen. Cutters for machining grooves by side running have a dovetail groove shape. It's a far more complicated process, but produces a far superior finish, which is often critical with dovetail o-ring seal grooves. thermal expansion of the groove and the O-ring. This one will be ma. 020" Radius. O-Ring can extrude into clearance gap or get squeezed in two directions. 83 CAD Availability: In Stock to 10 DaysDovetail O-ring Gland Design. Once you find the exact metric o-ring you need, you can easily order online from the world's largest o-ring inventory network. Download the pdf to. Very shiny, easily a 32 and good luck measuring the surface finish. Using the table above, determine the maximum recommended gland depth for your application. I have two circles representing my oring. Static Male and Female O-ring Seal Design . Metric Features: O-Ring Dovetail Cutters Solid micrograin carbide; For milling 24°o-ring dovetails; They cut with both top. It is often necessary to provide some mechanical means of. 66° Included angle, 24° per side. This feature article analyses an O-ring in a dovetail groove by using the finite element method. We use Coordinate systems for referencing. D3 Neck Diameter. 8 μm Ra) groove sides: X = 63 micro inches (1. Then, calculate the O-Ring groove diameter as follows: a. Calculated Values at Centrical Position of Rod: info O-Ring Compression (%) info Free Groove Volume (%) O-Ring Inner Diameter Stretch (%) info Results at Service min. An initial squeeze of the O-ring in the dovetail groove. The inserts are for machining O-ring dovetail grooves with 66° undercut angles. 6 µm Ra) Table 3. As well as the chemical volume swell or shrinkage of the O. Alternate solutions for creating retention in vertically oriented face seal grooves are: • Dovetail or Half Dovetail. O-ring standards are specified. DT3/8-15. Engineering, Materials Science. Male or Plug Seal design is based on the following factors (refer to fig. In the Expressions, you can make a list of which standard grooves you want to use, and list those in the UDF wizard. 070 0. 3. Anwendungsparameter & Materialauswahl. You can add industry standard O-ring and retaining-ring grooves to your cylindrical model. 8 μm Ra)Harvey Tool's fully stocked, ready to ship offering of Dovetail Cutters take into account a variety of included angles, lengths of cut, and corner radii, allowing you to choose the exact dimensions needed for your difficult dovetail groove cuts. The insert design is optimized for strength by utilizing an insert pair to generate the groove form. 8 µm Ra) for vacuum and gases X = 16 micro inches (0. A dovetail that will "hold" the O-ring at room temp. O-Ring Seal Design Guide How to design a proper groove to accommodate O-Ring Seal is essential for engineers who are new to metal seals. What is a Drop-Hole? When designing parts featuring O-ring grooves, the consideration of drop-hole allowance is a pivotal first step. 2360 Palumbo Drive. such as o-ring grooves, slots and snap-fit designs. They are custom molded to fit both round and complex groove paths with the potential to seal multiple ports with just one seal. 3. 050O-ring dovetail cutters are held to specific standards to cut a groove that is wider at the bottom than the top. Male or Plug Seal design is based on the following factors (refer to fig. Dynamic O-Ring Groove Design Rod-Piston; Static O-Ring Groove Design Dovetail; allorings. Very shiny, easily a 32 and good luck measuring the surface finish. For a static male to female mating interface: a compression ratio of 18-25%. D. For standard O-ring grooves in the face and radial applications, we recommend 60-90% gland fill. d Optional construction for shapes and long straights. Metric Features: O-Ring Dovetail Cutters Solid micrograin carbide; A hard thing to fix with dovetail grooves is the expansion issue. 075 to get about 30% squeeze under compression. Use our metric o-ring size chart to find common metric o-ring sizes by cross section, inside diameter, and outside diameter. Male or Plug Seal design is based on the following factors (refer to fig. Solid Carbide Dovetail Cutters for Half Dovetail O-Ring Grooves. DOVETAIL O-RING GROOVE DESIGN. Parker O-Ring Handbook - ORD 5700 pdf. EZ-Lok Seals. Unfortunately, they are very fragile due to their trapezoidal profile of a large Cutter Diameter with. John R. The part as received leaks. We have made this choice for these reasons: 1. The disc's low cracking pressure reduces the amount of energy required to open the valve and the valve's large body minimizes head loss across the valve. General purpose dovetails are used to undercut or deburr features in a workpiece. 1 at $210 and 2 at $165 each. e Minimum full thread depth. Dovetailed O-Ring Groove. Investigating the stress relaxation of photopolymer O-ring seal models. For rotary O-rings: a compression ratio of 0-10%. See the Dovetail Groove Cutter data sheet for more information (page 36). 6 µm Ra) Table 3. All are made with premium carbide to optimize strength and durability, giving you the longest life and best finish on hard metals. Dovetail; O-Ring Sizes. 1016/S1350-4789 (10)70393-7. Fax: 859-335-5128. Excessive system pressure . . 4-18 Parker Hannifi n Corporation • O-Ring Division 2360 Palumbo Drive, Lexington, KY 40509 Phone: (859) 269-2351 † Fax: (859) 335-5128 Static O-Ring Sealing Parker O-Ring Handbook For Internal Pressure (outward pressure direction) dimension the groove by its outside diameter (H ) and width: O (H ) = Mean O. check out this article to learn about our best tips for the successful design. An undercut or dovetail groove has proven beneficial in many applications to keep the o-ring in place. O'ring groove dimensions for static and dynamic operation. O-Ring Basics; Seal Types; O-Ring Elastomers; Static O-Ring Sealing. Otherwise, without these o-ring. o-ring diameter dovetail gland cl diameter (f) nom tol +/- nom tol +/- nom tol +/-dovetail gland and o-ring width and depth default recommendations dovetail gland and o-ring diameter default recommendations-005 0. • If using on either an ID Bore or OD Shaft. S. 002-006 0. THINBIT, manufactured by Kaiser Tool Company, has announced the expansion of its GROOVE 'N TURN line of dovetail grooving inserts. O-Ring inner diameter stretch, outer diameter squeeze. Timelord (Mechanical) 15 Dec 08 16:29. . The cross-section of the O-ring is seen as moderately arbitrary, as there are a few distinct advantages to either a larger or smaller cross-section O-Ring. round profile, the o-ring would have no choice but to extrude into. p r o d u c t Typically made from Greene, Tweed’s proprietary perfluoroelastomer compound—Chemraz®—Dovetail Seals ensure stability and cleanliness. Male or Plug - the O-ring groove is located on a plug which is inserted into the housing or cylinder (fig. Manufactured by Kaiser Tool Company, the Groove ‘N Turn line includes dovetail grooving inserts that machine O-ring dovetail grooves with 66-degree undercut angles. A while back I had some 5/16 deep custom oring grooves in Nitronic (worst material ever). Granted, a single dovetail groove can be cut using a dovetail bit with a slightly larger shank diameter, but it would still require a tool change. of sleeves and at faces of glands can be avoided through the use of dovetail-type O-ring grooves (Figure 13-60), rather than conventional rectangular O-ring grooves. For internal diameters of 1. 500 Major Diameter. 73 - Face Grooving Tools. Standard AS-568 size Rubber Square Rings can sometimes be used interchangeably in AS-568 standard size O-Ring gland designs. For technical drawings and 3-D models, click on a part number. 2 straight flutes. D. A dovetail face seal is a special static gland designed to retain the o-ring in the groove. 진공오링설계, Dovetail groove, Boss seal설계등에 대해서는 별도 문의하시기. After selecting a material that fits your sealing application, you can continue by having the Size Selector calculate the O-ring dimensions and tolerances, considering even thermal expansion and volume swelling of the sealing element. dovetail or half-dovetail grooves, are encountered but are much less common. Gland Design for Static Application for O-rings with Axial Squeeze. For static o-ring grooves. 3620 Centennial Dr. Popular O-Ring Material Comparison Guide. The Linear Feed must be reduced to account for angular velocity (see example). Part. Dovetail Insert Styles. Circle diameters are 4. Purpose – This paper aims to investigate the suitability of additive manufacturing to produce O-ring seals. Adheres to standards specified by the O-ring division of Parker Hannifin CorporationApplicationsUsed for milling half or full O-ring dovetail grooves WITHOUT a drop hole allowance. On the other hand, Super-O-Lube is an ideal all-purpose O-ring lubricant. O-ring Gland Design Dovetail seal Also here there is a metal to metal contact as long as the con-struction will not deform under system pressure. Made of solid carbide, they are harder, stronger, and more wear resistant than high-speed steel and cobalt steel for the longest life and best finish on hard material. 2360 Palumbo Drive. Making a. Designed to the standards suggested by the O-Ring division of Parker Hannifin Corporations (tools meet both specs: ORD 5700/USA, ORD 5700) Designed for milling half dovetails or full dovetails with no drop hole allowance. O-Rings. 형성된다. CNC, Swiss, Conventional and Round toolholders of various sizes and orientations available. Dovetail and Half-Dovetail Grooves . EIKOSHA Starting from: 136. Note: do not remove the part from the mill between making the fly-cut and milling the groove. No. If GD&T is used and/or critical, I would suggest using profile tolerance. For O-Ring Grooves > Dove Tail Cutter with Round Chamfering for O-Ring; Dove Tail Cutter with Round Chamfering for O-Ring. 1-30). Our Carbide O-Ring Dovetail Cutters meet Parker Hannifin standards. O-ring to severe chemical attack and breakdown. Bochnia. The O-ring is placed in the groove and a second flat surface compresses the O-ring. An undercut or dovetail groove has proven beneficial in many applications to keep the o-ring in place. (fig. hose fuel single√ o ring size chart pdf 155226-as568 o-ring size chart pdf Mechanical seal mating ringsRing groove dovetail dimensions metric grooves. 150" in . D. Dovetail Groove. Made of solid carbide, they are harder, stronger, and more wear resistant than high-speed steel and cobalt steel for the longest life and best finish on hard material. However, this is an expensive groove to machine, and thus should be used only when absolutely necessary. Lexington, KY 40509. . While Dove Tail O-ring grooves are. There is a large variation in the tools’ neck diameters. 156 endmill to cut the groove. The necessary radii that should be called out inside the groove on a larger part could be missed in CAD/drafting if it was not created or added when the 3D groove feature was created. The most important variable for installing an O-ring into a dovetail gland is making sure the seal is sized properly. Our Carbide O-Ring Dovetail Cutters meet Parker Hannifin standards. 471 dia. C. Basic sealing principles of the dovetail groove A rubber O-ring seal is used to prevent the loss of a fluid or gas. World Class; Certifications; Contact Us; Call Us: Seal & Design Canada: Toronto, Ontario (416) 741-7005 Toll Free: 1-866-242-3770 Headquarters: Clarence, NY (716) 759-3344 Higbee Division: Syracuse, NYA dovetail helps hold an o-ring in place during assembly (or shipping possibly) while allowing sufficient space for compression of the o-ring. The following information is a guide for o’ring. Dovetail o-rings come in a wide variety of widths, diameters, cross-sections and corner radii. 139 inch (3. 002 on the floor for the dovetail tool to finish the bottom and have no mismatch. 000 for all sizesThe perfect O-Ring for each purpose. A dovetail groove, however, is expensive to machine and thusIf you are looking for a comprehensive guide on O-Ring design, selection, and application, you should download the Parker O-Ring Handbook (ORD 5700) pdf. If excessive clearance is created, extrusion will result. Therefore, the body is one of the most important considerations when designing an O-ring groove. World Class; Certifications; Contact Us; Call Us: Seal & Design Canada: Toronto, Ontario (416) 741-7005 Toll Free: 1-866-242-3770 Headquarters: Clarence, NY (716) 759-3344 Higbee Division: Syracuse, NYFace Milling Cutters. However, this is an expensive groove to machine, and thus should be used only when absolutely necessary. It is often necessary to provide some mechanical means for holding an O-ring in a face seal groove during assembly and maintenance of equipment. 2. But you have to careful as they do have a. Check the diameter, wall angle, corner radius and O-ring standard specifications. 888-THINBIT (888-844-6248) E-mail: Questions relating to Orders Questions relating to Quotes Questions relating to a General Inquiry. A hard thing to fix with dovetail grooves is the expansion issue. Retaining Ring Groove. 1-24). All relevant parameters are taken into account, for example: Free groove volume. Once you find the right o-ring groove design you can easily order online from the world's largest. The results of this analysis show that compared with rectangular grooves, dovetail grooves contribute to the enhancement of seal performance. O-ring Size Charts Note: The AS O-ring Size Chart has a column that shows the Nominal Size along-side the Actual Size. 6. Dovetail O-ring so the O-ring stays in place; Recess for piping; Low Profile Locating Shoulder; Quick Release Custom Made in the USA V-band Clamp This set is comprised of a Male and Female V-band flange. TABLE 1 TABLE 2 Max Radial DOC ≤ 28 Rc 29 - 37 Rc 38 - 45 Rc 23807 0. Female or Tube - the O-ring groove is located in the housing or cylinder and a tube is installed through the O-ring l. The retention feature makes having an upside-down or vertical face seal groove much. 24° Per Side, 48° Included. 002: Milimeters +. Ozone Attack. Each user should conduct evaluations to determine the suitability for his particular application. Lexington, KY 40509. All are made with premium carbide to optimize strength and durability, giving you the longest life and best finish on hard metals. O-ring Size Charts Note: The AS O-ring Size Chart has a column that shows the Nominal Size along-side the Actual Size. 125" and . Double sided dove tail vs one sided dove tail groove for o-ring Double sided dove tail vs one sided dove tail groove for o-ring elinah34 (Mechanical) (OP). Surface Finish X groove top and bottom : for liquids X = 32 micro inches (0. This is particularly true when machining O-ring grooves, as this operation requires the tool to drop into the. Dovetail grooves are used to hold the O-ring in place on a face seal groove during assembly and maintenance of equipment. Dove Tail Cutter 2-Flute for O-Ring. Tools have flats on the shank for quick alignment. Their extreme hardness means they are brittle, so a highly rigid setup, such as a CNC machine, is necessary to prevent. 3620 Centennial Dr. In both static and moving applications it is sometimes necessary to mount an O-ring in a face-type groove in such a way that it cannot fall out. 080, . 1. of Flutes Price AlTiN; HDG1/16. For O-Ring Grooves for industrial applications. 1-23) 2. Download it for free and enhance your knowledge of sealing technology. This dovetail o-ring groove design guide will help you find the right dovetail o-ring. Originally the nominal size was just for a listing of the approximate fractional dimensions of the O-ring. 가장 기본적인 O-ring groove 는 Groove 단면 형상에 따라 크게 두 가지로 나뉜다. 0159 2 3 4 2. on O-ring drive belts and their application will be found in O-Ring Applications, Section III. Refer to the O-Ring Handbook or consult a Parker applications engineer for assistance in sizing O-rings to dovetail glands. Lexington, KY 40509. Dynamic O-Ring Groove Design Rod-Piston; Static O-Ring Groove Design Dovetail; O-RING MATERIAL GUIDES. 005 0. A drop-hole is an off-center hole. 53 - O-Ring Dovetail Groovers. The groove design allows the O-ring to be retained in the axial/face seal during assembly and maintenance. Download PDF . 86 - Dovetail Cutters 40° Included. After further inspection, we now see 3 out of 6 holes have some pitting. Joined Aug 3, 2006 Location Cape Cod, Ma. In the situation that an O-ring rolls in the groove and creates torsion, a Quad-Ring®/ X-Ring will slide with no negative results. My guess on the reason you are having problems finding specs for orings smaller than -004 is that the o-ring cross section starts dropping below 1/16" for the smaller sizes. The retention feature makes having an upside-down or vertical face seal groove much easier. Gland Size Calculator. 001" increments. 0620: 0. For applications requiring more than two or. 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 - . Face seals can seal internal pressure, external pressure, or both. 0700: 0. Dovetail grooves are used to hold the O-ring in place during installation or maintenance. 1-23). DT10MM. No matter if you need metric or inch, standard or custom-made O-Rings – any size of O-Ring seals is available – including giant O-Rings using our Fleximold™ process. The dovetail groove has inclined sidewalls, making it look like a dovetail, hence the name. This type of grooving operation is often used for creating features like O-ring grooves or oil grooves on the outer or inner diameter of cylindrical parts. 24° per side, 48° included. 300", . Their extreme hardness means they are brittle, so a highly rigid setup, such as a CNC machine, is necessary to prevent. . Their extreme hardness means they are brittle, so a highly rigid setup, such as a CNC. Dovetail Cutters-Sight Groove Dovetail Cutters Solid carbide tool designed for milling dovetail grooves for Sight Attachments, and offered in 50° or 60° included angles. Tool numbers with US suffix have reduced neck diameters as shown in table. For axial, radial and flange applications. O-Seals. A schematic diagram of a dovetail, trapezoidal groove containing an O-ring is shown in Figure 1. The critical design point to keep in mind is homogenous rubber acts like a highly viscous fluid. The male flange has a dovetail O-ring groove so that it actively retains the o-ring (it is actually pressed into the groove). Learn about the factors that affect vacuum sealing performance, such as o-ring size, material, groove geometry, surface finish, and lubrication. FeaturesCNC ground in the USA from solid C2 micrograin carbide. O. (480) 968-0957 FAX (480) 968-8042 info@. complete dovetail groove. f Groove style A – Groove providing improved retention of O-ring – Option 1. The insert design is optimized for strength by utilizing an insert pair to generate the groove form. Then, calculate the O-Ring groove diameter as follows: a. O-Ring Size Charts O-ring, x-ring and square ring size charts. Of Flutes. 5. Dovetail grooving inserts are used to machine O-ring dovetail grooves with 66-degree undercut angles. For a bore (piston) seal:O-Ring Min Groove Diameter. . This can make them challenging. Of Flutes. Endplates, also known as top plates or baseplates are available in 304SS or 6061-T6 Aluminum. O-rings used as Boss Seals can withstand much higher application pressures because the threaded hardware mates to eliminate a clearance gap. ©2021 Kaiser Tool Company, Inc. 065. Square groves are a necessity. 70 - Double End Split Blanks. For O-Ring Grooves - Cutting Tools a variety of drilling and cutting tools available 24 hrs. D. With the O-ring calculator, engineers can specify the groove dimensions for a specific O-ring or a specific groove. 70 - Double End Split Blanks. . Custom O-Ring Gaskets; Surface Mounted. Ph: 859-269-2351 Fax: 859-335-5128. For ferrous and non-ferrous materials. This PDF catalog covers the design, materials, installation and applications of O-Rings and Back-up Rings, with detailed illustrations and tables. The proper o-ring size is a fundamental aspect of proper o-ring performance. Fax: 859-335-5128. Made of solid carbide, they are harder, stronger, and more wear resistant than high-speed steel and cobalt steel for the longest life and best finish on hard material. O-ring grooves are high-speed steel or carbide cutters used for O-ring groove machining. Dovetail grooves are used to hold the O-ring in-place on a face seal groove during during assembly and maintenance of equipment. DeepGroove®. D. These pictured tools are designed to mill a groove for a Parker Hannifin O-ring groove No. Dovetail grooving inserts are used to machine O-ring dovetail grooves with 66° undercut angles. Endplates can be used in conjunction with our series of feedthrough collars, service wells, pyrex or metal bell jars, frames, and hoists. To compress an O-ring of 5. O-Ring Compression (%) Groove Depth incl. thermal expansion of the groove and the O-ring. 178 0. tool # diameter minor dia groove depth top radius bottom radius flutes o-ring size shank dia overall length 1 pc 2-10 11-25 26-100; 51-8010: 0. O-Lube has a recommended service temperature of -20°F to 180°F (-29°C to 82°C). For designing systems which contain internal pressure, like the example below, the groove's outside diameter (OD) is primary, and the groove's width then determines the inside diameter. The Parker handbook does not define the bottom (. 002For standard O-ring grooves in the face and radial applications, we recommend 60-90% gland fill. 5000: $71. 70 - Single End Split Blanks. 33 mm thickness by 20 %, approx 5 N per mm of sealing length is required for a hardness of 70 Shore A resp. Surface Studio vs iMac – Which Should You Pick? 5 Ways to Connect Wireless Headphones to TV. Popular O-Ring Material Comparison Guide. 005. Dovetail O-ring design. Dovetail glands are used in static or slow moving dynamic applications, and require strict tolerances that are difficult to control. . This is beneficial for special applications where the O-ring has to be fixed by the groove e. 3 Directory. Slots or grooves can be short or long, closed or open, straight or non-straight, deep or shallow, wide or narrow. Dovetail grooves are a great mechanism for holding O-rings in place. Static O-Ring Groove Design Dovetail; O-RING MATERIAL GUIDES. The purpose of the tables below are to serve as a design guide for Dove Tail O-ring grooves using all AS568 O-ring sizes*. Read Next Five Common Mistakes Shops Make with ER Collets (And How to Prevent Them) World Machine Tool Production and Consumption Modestly Down in. D. Learn More > Contact. The o-ring is forced into the dovetail on installation, possibly tearing the o-ring. Unless you are thinking of some special application. 0. 071" Groove Wd. . Optimized for O-Ring grooves. For O-Ring Grooves for industrial applications. 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. 250" and 3". Dovetail grooves are used to hold the O-ring in-place on a face seal groove during during assembly and maintenance of equipment. I also included shots of a few liners. O-Rings. The AS568-901 through -932 O-ring sizes (Parker’s 3- series) are intended to be used for sealing. They are typically used to produce dovetail O-ring grooves in fluid and pressure components as well as industrial slides. Tool selection is normally determined by the width and depth of the groove and, to some extent, length. Dovetail grooves are incorporated into a design to help hold the O-ring in place during installation and maintenance. CNC, Swiss, Conventional and Round toolholders of various sizes and orientations available. Bottom Radius. For rotary O-rings: a compression ratio of 0-10%. check out this article to learn about our best tips for the successful design. Face Milling Cutters. 쿼드링은. Dovetails cutters can come in seventeen included angles to make sure. Male or Plug - the O-ring groove is located on a plug which is inserted into the housing or cylinder (fig. $10 for the bit and Free shipping, that's a deal :dance3: I got lazy and just used some wood to box the "flange" over the bit on three sides and then just feed into the bit while turning. Once you find the exact metric o-ring you need, you can easily order online from the world's largest o-ring inventory network. 005 0. This feature article analyses an O-ring in a dovetail groove by using the finite element method. The dovetail groove construction is only recommended for O-rings with bigger cross sections, . Since this operation (the closing of the door) must happen rapidly I cannot afford to have the o-ring come out of its groove, hence the need for a dovetail groove. The inserts are for machining O-ring dovetail grooves with 66° undercut angles. O-ring calculator with complete design analysis. 101 0. Choose from our selection of groove cutters, including over 700 products in a wide range of styles and sizes. (A) is shown as a radius rather than a diameter. Thermal swell of the rubber material. Diamond Seals. Rather than a grease, the Super-O-Lube is a high viscosity silicone oil. Create dovetail grooves that allow O-rings to flex without falling out of place. Click Grooves (Toolbox toolbar) or Toolbox > Grooves. B. The high component value and complexity make process security essential. e. Dovetail joints are commonly used in furniture creation, thanks to their inherent resistance and tensile strength. This can be done by using a dovetail groove. For reciprocating O-rings: a compression ratio of 10-20%. 24° per side, 48° included. , we not only stand by our product 100%, but we use them in our day to day operations. 031"-0. The retention feature makes having an upside-down or vertical face seal groove much. For reciprocating O-rings: a compression ratio of 10-20%. 1/2. Calculated Values at Centrical Position of Rod: info O-Ring Compression (%) info Free Groove Volume (%) O-Ring Inner Diameter Stretch (%) info Results at Service min. A common mistake is to design the groove width to “pinch” the o-ring cross-section, so it is held in the groove. The high component value and complexity make process security essential. Trapped volumes caused by unvented single or double dovetail o-ring groove designs. Remit To Address: Kaiser Tool Company, Inc. The most important variable for installing an O-ring into a dovetail gland is making sure the seal is sized properly. You probably need. groove with a Standard Face Grooving Insert the width of the top of the Dovetail Groove. O-Ring can extrude into clearance gap or get squeezed in two directions. The Parker O-Ring Handbook is a. 888-THINBIT (888-844-6248) E-mail: Questions relating to Orders Questions relating to Quotes Questions relating to a General Inquiry. The critical design point to keep in mind is homogenous rubber acts like a highly viscous fluid. 103 . Displays the diameter of the selected cylindrical face, or No selected diameter. 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. Very shiny, easily a 32 and good luck measuring the surface finish.