Dovetail groove dimensions. The retention feature makes having an upside-down or vertical face seal groove much easi. Dovetail groove dimensions

 
 The retention feature makes having an upside-down or vertical face seal groove much easiDovetail groove dimensions 5, 14, 14

Boss Seal. Chemraz® O-Rings FFKM. Putting the angled face to the outside renders it useless for retaining the o-ring because the o-rings is pulled towards the. Called a shoe. Included are Static, dynamic, and pneumatic applications. 6. 003 (1. 015: 2: $68: $72:. These dimensions were determined in consideration of ease of processing when fabricating dovetail structures by. Dovetail cutters are specialized tools for cutting a dovetail angled grooves into a workpiece and are used for fitting or joining parts. Learn More. a Pitch diameter. See the Dovetail Groove Cutter data sheet for more information (page 36). A wide variety of elastomers can be bonded to a varietyThe MATCHFIT dovetail track system allows you to create your own tracks with just a router bit. e. . 063” to 1”. 11mm calculates to . 090”, . or longer in some cases. 815267011351. The result will be that the ring will extrude itself under that temperature cycle. 78 mm). Despite this we can bear no responsibility. In radial grooving, the groove is cut perpendicular to the axis of the workpiece, effectively radiating out from the center of a cylindrical part. Dovetail alignment board. Some other less known, but currently commercially available dovetail mounts, are 12, 13, 13. 122 0. Dovetail Insert Styles. This offering of Parker Hannifin O-Ring Dovetail Cutters WITH Drop Hole Allowance is designed for milling a full dovetail groove, and is engineered to align with the standards. Lip body. s e a l s The unique geometry of Greene, Tweed’s Dovetail Seal precludes twisting and simplifies. 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. Locations. The Trap-Seal is a trapezoidal-shaped O-ring that is designed to stay securely lodged under the groove lip of the O-ring face seal (ORFS) fitting. You might want to, look up, the Gun Smith that makes, the Lil' Crow Gunworks, GRX, "recoil Lug" for Rugers on, youTube and give him a call. Shop Manual Z-Axis Stages - Dovetail Groove, Rack & Pinion, Long Stroke, ZLWG Series from MISUMI. 180-inch grooves and are unique in that they feature no standard for the distance from one groove to the next. The American dovetail actually measures 12. Bed dovetail angle:. 1 7/8 ". It’s hard to think of a woodworking joint you can cut faster than a half-blind dovetail — both. 3 Advantages of O-Rings • They seal over a wide range of pressure, temperature and tolerance. 2. Using a drop-hole will allow the use of the stronger tool, which will increase. Once you’ve decided on a set of dimensions for your joint, draw two lines of a corresponding width down the face of your socket piece with the aid of a ruler or straightedge. GROOVE 'N TURN dovetail inserts fit existing "L" series THINBIT toolholders. If this is the case, lack of space can damage the O-ring and affect the quality of sealing. 0. com 3/4″ Diameter Dovetail Cutter 60 Degree High Speed Steel (2906) Features : High speed steel cutter. When viewing the face of the board, the tails resemble a dove’s tail. Use the Dovetail Clamps to secure material for cutting or assembly ; Specifications. e. Specialty Metals Compliant (252. All the tails are cut into one piece of wood, called here the tail piece. Ultra Quick-Shield offers excellent shielding at an affordable price. The groove dimensions are incorporated in the standard dimensions. Several alternative designs were considered before agreeing to adopt the dovetail groove. By simply entering installation specifications for an application, it recommends O-Ring sizes, housing layout and. After entering the groove dimensions, enter the application parameters as well as the o-ring size or dimensions. There are various sizes of drill bits, various sizes of screws and nuts, and various batches of. Dovetail cutters are specialized tools for cutting angled or trapezoidal-shaped grooves (dovetails) into a workpiece. Choose from our selection of dovetail milling cutters in a wide range of styles and sizes. Then another form of dovetail for mounting finders. Gland width is to sharp edge of groove. / ea. Thinbit, manufactured by Kaiser Tool Company, has expanded its Groove ‘N Turn line to include dovetail grooving inserts. Work back to the base line with the final trim on the base line. 77 x 9. 070, . If your air gun or rimfire gun has a scope dovetail that measures either 11mm or 3/8" (approx. Unequal flute spacing and irregular flutes ensures stable machining of difficult-to-cut materials and higher efficiency. Dovetail and Half-Dovetail Grooves; Boss Seals; Failure Modes;. Recoil groove on Tikka T3 for example is located on top of the rifle's receiver in between mounting holes. By the sound of it you have a 3/8" Dovetail. 42 - Quick Change Face Grooving Tools. For bolted flanges or open & close lids. 25" and round shank sizes. This paper covers the development and testing conducted to adopt the dovetail groove in the SAE standard. male. 9-2 Parker Hannifi n Corporation • O-Ring Division 2360 Palumbo Drive, Lexington, KY 40509 Phone: (859) 269-2351 † Fax: (859) 335-5128 Sizes Parker O-Ring Handbook SizesThe KLICK is one of our concealed woodworking fasteners used to snap-in components with small dimensions, such as trims and moldings. Note that the dovetail groove becomes rectangular when the base angle a = 90°. The I. Available in the most popular materials. It tends to look like one with some imagination. Again this is the right side. 610" Thru 56mm 34MM Low 0. 002 for sizes 2-006 through 2-324 - . 5, 14, 14. Furthermore, the O-ring groove has triangular, rectangular, or dovetail shapes. 004" to 0. sKLICK – Dovetail Connector. For these situations, O-ring grooves in accordance with the standard static seal glands found in Design Chart IV (seeAS568B STANDARD O-RING GROOVE DESIGN. Vixen developed the dovetail plate for mounting a telescope to a mount. Solid Carbide Dovetail Cutters 1/16 3/32 1/8 3/16 1/4 3/8 , O-Ring Grooves . We're proud to offer the world's largest inventory of readily-available and highly customized sealing solutions. One area of caution with a dovetail or a half dovetail is the naturally high ratio of O-ring volume to gland volume. com DOVE-TAIL GLANDS Used to prevent the O-Rings from falling out of the Glands. Route 1/4” relief grooves to prep the MATCHFIT Dovetail Router Bit. O-Ring Size Charts O-ring, x-ring and square. Anschutz changed their foresight mount in 1987, when the 1900 smallbore rifles replaced the 1800. It is a type of groove designed to provide superior sealing performance in applications with significant thermal or pressure cycling. cut. Simply make a dovetail groove and get the clamping pressure you need where you need it. Table 3. Item Dimensions LxWxH ‎4. the groove to ensure the seal does not “roll” or extrude out of the groove. The inward-slanting walls of the dovetail groove prevent the tail from pulling straight out. The 11 mm dovetail has a 60-degree angle, while the 3/8” dovetail has a 45-degree angle. These correspond to AS568 dimensions. Step 1. Dovetail Grooves are effective at retaining seals, however they come with a few challenges. Parker O-Ring Vacuum Sealing Guide is a comprehensive pdf document that provides technical information and best practices for designing and selecting o-ring seals for vacuum applications. . . A side note on angles: In joinery, it is common to measure angles (other than square and 45 degrees), not in degrees, but as the ratio between the side and hypotenuse of a right triangle. Using the table above, determine the maximum recommended gland depth for your application. e Minimum full thread depth. Through Dovetail Wood Joints have 2 to 4 joints and full joint depths. 070. 2 W Cross Section Nominal Actual L Gland Depth Squeeze Actual % G Groove Width R Groove Liquids Radius Vacuum and Gases 004 through 050 1/16. Surface Finish Static Grooves Straight-sided grooves are best to prevent extrusion or nibbling. 150" in . 25 Sealing Details / Elastomer seals O-ring tolerances ± 0. 362. ) Industrial Static Seal Glands metric conversion 32√ = . 070 ±. These charts give dimensional information relating to standard and o-ring and dovetail o-ring grooves. It also provides detailed tables and charts for various O-Ring sizes, materials, and standards. 003 0. 054. Deduct this from the 3″ and you end up with 1 7/8″ so the dovetail width will be 15/16″. This section calculates the equivalent circular groove dimensions, for use in the Seal Design Section, for a racetrack groove. -thick drawer front. Select the ORDER CODE in the table below that represents your selection of shank dimensions. e. I believe that most European rimfires give their dovetail measurement in mm. 150” with major diameters starting at . The high component value and complexity make process security essential. 000 +. • To deburr use a Scotch Brite pad (a deburring knife will destroy the “W” tolerance). WEAVER 4 weaveroptics. This groove can either be extruded, or machined using a special dovetail cutter which is available from Spira. Whether for a telescope mounting plate, a dovetail shoe for a finder bracket or a wood joint. Five degree sloping sides are easier to machine and are suitable for lower pressures. For technical drawings and 3-D models, click on a part number. Enter the MINIMUM % COMPRESSION 8. , Japanese JIS, British BS and Common Metric o-ring size charts. 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. 010-. Their extreme hardness means they are brittle, so a highly rigid setup, such as a CNC machine, is necessary to prevent. Dynamic sealing applications use this groove, such as in pneumatic systems. Use this tool for designing new glands based upon desired o-ring sizing. The conditions considered to formulate the design criteria are also described, e. The dovetail groove construction is only recommended for O-rings with cross sections of . 5 mm, 16. S. O-ring in the smallest possible groove (i. O-ring in the smallest possible groove (i. 8 μm Ra) Dovetail seal Also here there is a metal to metal contact as long as the con-struction will not deform under system pressure. 376 through . c Sharp edge or burr not allowed; break corner 0,15 max. 5 mm. Because they can be expensive to machine, O-ring grooves should only be added when. Designing Axial Static O-ring Grooves to "Industry Standards" | GrabCADKLICK – Dovetail Connector. Split rings for 11mm European grooved receivers European 11mm dovetail grooves do not have the same dimensions as the American 3/8" dovetail. Seal ring grooves are critical features on many oil and gas components, and require close tolerances and a high-quality surface finish. Ruger 77 (M-77) Rings. , at the hardware and O-ring tolerance stack-up) and the smallest possible O-ring in the largest possible groove. O-Ring Size AS568A-W Cross Section Nominal Actual L Gland Depth Squeeze % G Groove Width (To sharp corner) R R 1 004 through 050 1/16. 42, lists SAE recommended dimensions for dovetail glands by ascending AS-568* numbers. DesignThe invention belongs to be machined field of measuring technique more particularly to a kind of dovetail groove guide rail slide unit measuring device, including measuring table, linear measure longimetry component and angle measure component, linear measure longimetry component is used to measure the height and width of slide unit or dovetail. 9. The dovetail grooving inserts are intended to machine O-ring dovetail grooves with 66-degree undercut angles. Boss seal The groove dimensions are incorporated in the standard dimen-sions. How. Dovetail grooves are incorporated into a design to help hold the O-ring in place during installation and maintenance. Below are our sight offerings for 1911 pistols with Novak® LoMount dovetail cuts: Please confirm slide dovetail cuts and dimensions with your firearm’s manufacturer, or a local gunsmith prior to purchase (below are the Novak® LoMount dimensions). 59 0. Learn more about Metric O-Ring Groove Design. 330” x 65 degrees. Dovetail grooving inserts are used to machine O-ring dovetail grooves with 66 ° undercut angles. 61 x 2. They work well with machines and. You should find only a horizontal bar on a pre-Gen5 OEM G19 rear sight, indicating sight top elevation is 6. Gland Size Calculator. The medium rings measure 28mm and the high. 2. 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. Gland width is to sharp edge of groove. Once you find the right o-ring groove design you can easily order online from the world's largest. This groove is difficult and expensive to machine, and the tolerances are especially critical. 0569 ; 60°/. It should be used only when it is. D. Offered with a sharp corner, . The standard american dovetail is referred to as a 3/8" dovetail because the distance between the grooves is a nominal . Data sheet. 079" deep. Subtract line 4 from line 2 6. Parker Hannifin2360 Palumbo DriveLexington, KY 40509Ph: 859-269-2351Fax: 859-335-5128 oesmailbox@parker. Table B Static Axial Seal Gland Dimensions 4 Tolerance +. Three highly requested features are brought together in the 8×12 Dovetail D-Log to create a widely desired building system. g. Face Grooving Lathe Tools. Gland Design Dovetail Grooves Inches; Gland Design Dovetail Grooves Metric;1--marcorubber. ( 3/8" has a 45 degree mill cut versus the 11mm with a smaller top and 60 degree angle mill cut. 5 mm). Dovetail Gland Dimensions: Table E, p. 050 to. long, and bases to 96 in. Can anyone tell me the nominal dimensions of a rear Novak dovetail groove for a 1911? I have a pistol with a "novak style" (i. The American dovetail actually measures 12. RWP-038SS, Stainless Steel, . axis of the barrel at the bottom of the slot, the widest fore and aft. The difference is enough that old foresights are too narrow at the bottom to fit onto new. 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. com O-Ring Products. Cross Sectional Dimensions AS568A Series O-Ring Cross Section Gland Width Squeeze Gland Depth Gland Corner Radii Actual Tol +/- (G) % (L) (R) (R1) -004 To -050 0. Metric o-ring groove dimensions are listed for the most common metric cross sections with and without backup rings. So, if you’re fairly new to woodworking, or you need to brush up on your skills, here’s your chance to master. Surface Finish X groove top and bottom : for liquids X = 32 micro inches (0. GROOVE 'N TURN® dovetail grooving inserts are used to machine O-ring dovetail grooves with 66° undercut angles. A new dovetail groove, which positively retains the O-ring, has been designed and incorporated into the SAE J1453 standard. 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. A dovetail joint or simply dovetail is a joinery technique most commonly used in woodworking joinery (carpentry), including furniture, cabinets, [1] log buildings, and traditional timber framing. If the dovetail is too narrow, balancing the piece on the router table is difficult. This results in smoother dovetail grooves and keeps your Dovetail Bit lasting longer. 73 - Face Grooving Tools. Before you can install the sight in a sight cut & dovetail, you generally have to fit the sight to the sight cut & dovetail. → Order a Sample Pack. Surface Finish Static Grooves Straight-sided grooves are best to prevent extrusion or nibbling. O-ring groove design is a key consideration in the o-ring selection process. A hard thing to fix with dovetail grooves is the expansion issue. 1-30). The "new" front dovetail is the same 11mm as for the rearsight, and is much shallower than the "old" dovetail. The variable names PISTON-TYPE SEAL FACE-TYPE. 003” extension. The gaps between tails are called pin sockets, with the gaps between pins known as tail sockets. Fits standard 14°-1/2" dovetail profiles which double as woodworking tracks. Anyone know where I can get the standard dimensions for the grooves on these receivers? I've measured them on what I have (Marlin bolt and semi-autos) and there seems to be some significant variation. A. (fig. The insert design uses an insert pair to generate the groove form. 225-7009). ) 10˚ Stroke Shaft Diameter (SD) Shaft Diameter (SD) Flats are tangent to GD NOTE: All dimensions and tolerances are in millimetersMANU TRUCTION iii AMERICAN WOOD COUNCIL FOREWORD This Manual for Engineered Wood Construction (Manual) provides guidance for design of most wood- based structural products used in the construction of wood buildings. 375", not . Metric O ring groove dimensions are also an important factor for determining how your metric O-ring will perform once it is installed. 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. If you have a custom O-ring size that does not appear on this chart, contact us directly and we can help you size your O-ring gland design accordingly. 73 - Face Grooving Tools - Full Radius. dovetail slot: the opening and end widths, shoulder angle and depth of. For exact details,. The ERIKS O-Ring design calculator features the calculation of: for axial seals with inner or outer pressure, piston seals and rod seal applications. PDF Instructions 2. V-Grooves / Chamfers (Customized Straight Blades) V-Grooves / Chamfers (Customized Straight Blades). Less time sanding, more time building. 003. . This document. Softwoods are traditionally 1:6 and hardwoods 1:8. 4) Using calipers, measure across the OUTSIDE of the pins 5) Note the constant corresponding to the MALE DOVETAIL ANGLE from the following list: 45°/. Our O-Ring Dovetail. If your rifle is like that, some airgun rings may foul on this raised area. Polyurethane O-Rings. The ASME B16. table of dimensions of o-rings for static sealing of cylindrical surface and flat surface. d Optional construction for shapes and long straights. 1-30). d Optional construction for shapes and long straights. Undercut very slightly to allow the shoulders to pull up nicely. 00. Surface Finish X groove top and bottom : for liquids X = 32 micro inches (0. 5 mm). 4. Drill/Mill. 6. RWP-034SS, Stainless Steel, . The dovetail groove described in Design Charts 4-4 and 4-5 will serve this function. Please contact Greene Tweed engineering for help or advice if required as some applications are difficult to optimize both at ambient and operating temperatures. A wide variety of elastomers can be bonded to a variety The MATCHFIT dovetail track system allows you to create your own tracks with just a router bit. 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. (b) This chart provides dimensions for standard (AN) shrinkage materials ONLY. KAISER TOOL COMPANY, INC. Dovetails come in several different types and sizes depending on manufacturer, but the most common are the 11 mm and 3 ⁄ 8 inch (9. The parameter dashboard in the Results section will immediately show you if the selected O-ring size is suitable for your. 6. The variable names PISTON-TYPE SEAL FACE-TYPE SEAL ROD-TYPE. Dovetail grooving inserts are used to machine O-ring dovetail grooves with 66-degree undercut angles. Half blind dovetails are just as easy. 433" so I would assume that you could follow the directions for the 3/8" dovetail but make the distance between the grooves about . Gland width is to sharp edge of groove. to 500” I. 010" corner radius, Harvey Tool's expansive offering of solid carbide, fully stocked Dovetail Cutters is the industry's best. Why should you invest in a quick-release system? Because screwing your camera or lens onto a platform with a standard ¼"-20 screw is tedious and insecure. 139 inch (3. Cut the 1/4" plywood bottom to size. Use very small (1/16”) dots of glue every 3-4” along the groove. • Ease of service, no smearing or retightening. F Groove Depth (Ref. For applications requiring more than two or three. Installation steps Dovetail grooves are a great mechanism for holding O-rings in place. Boss seal The groove dimensions are incorporated in the standard dimensions. Refer to the O-Ring Handbook or consult a Parker applications engineer for assistance in sizing O-rings to dovetail glands. Inser. While effective at retaining a seal, this method requires more assembly care and effort to preventA through dovetail joint displays interlocking pins and tails that extend through the full thickness of the adjoining pieces, visible from both sides. Thus 9. While the outer appearance mirrors a simple miter joint, the interior hides the intricate dovetailing that offers superior strength. Can I just buy any novak sight and have it be the proper fit? this sketch is the dimensions of my slide dovetail cut. Hold the piece in your dominant hand and use your opposite hand to pin it firmly against the table's fence. , as well as submicron grain carbide grades for. Typical feature details and tolerances for o-ring grooves to let the o-ring seal properly in my experience are: - surface finish on the "bottom" of the groove (and on the mating part's "counterface") - the. They learned, for instance, that a. Mossberg’s tip-off concept spawned some new ideas, such as this Bushnell scope with a dovetail rail that mirrors a . The inward-slanting walls of the dovetail groove prevent the tail from pulling straight out. 055. This US Customary Units Full Face Gasket table is available for download by clicking the above image. They have highly sensitive, wear-resistant jeweled bearings for a long service life. Dimensions metric groove dovetail axial radial standard rubbershopGroove ring metric reference applications basic seabrook po 1150 nh box Industrial o-ring providerRing groove chart dimensions installation oring seal rod. O-Ring Dovetail Grooves Radius “R” is CRITICAL. The 11 mm dovetail has a 60-degree angle, while the 3/8” dovetail has a 45-degree angle. Prior to the common use of dial calipers many people called out a 1 inch by 1-1/4 rt = O-ring, this was a dash -214 O-ring. 080, . (male gland) Groove width Plug Dia. Our custom KLICK Dovetail Router Bit is specifically designed to route the groove for the KLICK and sKLICK. A dovetail that will "hold" the O-ring at room temp. 013 to. 005-. In addition, the flute runs through the neck, further reducing the tool’s core diameter. 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*. For a rod (shaft) seal:O-Ring Max Groove Diameter = Min Shaft Diameter + (2 x Recommended Gland Depth) b. Some other. Please consult the factory or your local Parker Distributor for the availability of special sizes not included in this list as of this writing. 3 Assembled Height (in. Polyurethane O-Rings. EPDM O-Rings. T-Slot. This paper focuses on analyzing mechanical behavior of dovetail joints with certain geometries and manufacturing imperfections subjected to different loadings. In this video I test the strength of dovetail grooves when used with the Microjig matchfit dovetail clamps. Dovetail grooves are used to hold the O-ring in place on a face seal groove during assembly and maintenance of equipment. Press-In-Place Seals. The dovetail groove described in Design Charts 4-4 and 4-5 will serve this function. Since the glue may degrade the shielding, use as little as possible to hold the gasket in place. 6. You can always vary the sizing on boxes where the overall height of the box is not intended to fit. And that measurement is across the top of the dovetail. Half-Lap Dovetail Wood Joints have 2/3 widths and joint depths of 1/2. The dovetail clamp rail is reversible to fit both 9-11mm (airgun) and 3/8" rimfire rifle receivers. 200 info free groove volume at inst (%) radius (mm) Max. The Standard O-ring groove is typically used in applications where there is a need for a static seal, such as in hydraulic systems. 75 – $ 115. 50 – $ 110. Radius-tipped dovetail cutter ends are straight flutes with ground radius on the very tip. It’s like an infinite supply of T-track without the cost of T-track. Proudly made in the USA by AB Tools, Inc. A 1/6-slope tail should be measured out like this:This has grooves cut into the receiver, but a circular profile between them. (fig. To finish this box, how about we go and cut a groove in the bottom here and insert a plywood bottom. Dovetail cutters are specialized tools for cutting a dovetail groove into a workpiece, for fitting or joining parts. Geometries including lead angles, top rakes, chip breakers, clearance angles and custom forms can. Engraving. DOVETAIL O-RING GROOVE DESIGN. Available in the most popular materials. 53 - O-Ring Dovetail Groovers. 004 for sizes 2-325 through 2-460 Design Guide 5-2a: Gland Dimensions for Industrial Recipro-cating O-Ring SealsSpecialty Profiles. and in cross sections from . of sizes from 5” I. e. Precision coolant improves chip evacuation and decreases the risk of chip jamming in the groove, especially in deeper grooves. However, that is not the only difference between the two dovetails. These groove cutters are custom cut two-fluted end mill, made of Carbide. Choose whether you are working with existing hardware or designing new hardware. 157 0. Solid Carbide Dovetail Cutters for Half Dovetail O-Ring Grooves. Like 15-30% based on service. 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. 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. 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. 330" wide, . 70 - Single End Split Blanks. Several alternative designs were considered before agreeing to adopt the dovetail groove. However, installing an O-ring into these grooves can be tricky without proper technique. PTFE o’rings in radially loaded closed grooves are generally not recommended, however if this is unavoidable, PTFE o’rings can be heated to around 100°C to. 005 clearance per side): Calculator Output Precision: decimal digits. dated by a dovetail groove. 103 . Make it 1 ⁄ 8 " wide and nearly as deep as the dovetail groove. The extra void space in the design allows the O-ring to swell slightly due to thermal expansion or. Cross Section W Groove Depth EDovetail Cutters. 3/4-16: Pulley groove side angle: 19°. 05 6 M4 x 10 SHCS 4 R Location of plate groove determined by mold design 60˚ grinding center provided on both ends. Logged. 5” (3. Static Male and Female O-ring Seal Design . Surely 3/8" falls between 9 and 11mm anyway ? It is my understanding that the main difference between 3/8 and 11mm is not the width of the dovetail, but rather the angle of the groove.