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AS-568 Standard O-Rings*

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AS-568 Standard O-Rings* AS-568 Standard O-Rings* Quick Reference Chart applerubber.com General Applications Apple O-Rings are available in a choice of six basic materials, each in a range of optional durometer (Shore A) hardnesses. Other materials available upon request. Buna-N/Nitrile: Buna N/Nitrile Neoprene®: In the Neoprene All mateials are compounded A. Pressure: determines rubber is a copolymer of family, you will find compounds under stringent quality control material hardness and butadiene and acrylonitrile. which are the superior sealing for uniformity of physical selection. You will find compounds that materials for the refrigeration property, and to meet B. Heat/Cold: check material are ideally suited for oil and industry featuring resistance to or exceed government, temperature range(s). fuel-resistant applications of ammonia and Freon®. military, space program, all types. automotive, F.D.A., industrial C. Friction: determines Fluorocarbon: In the and commercial specifications. material hardness and Ethylene-Propylene: In the Fluorocarbon family, you will selection. Ethylene-Propylene family, you find compounds that make up To Determine Material: will find compounds that are the preferred seals for aircraft 1. Determine end use: static D. Permeability: important used extensively for outdoor, engines, automotive fuel (stationary) or dynamic for pneumatic and weather-resistant uses and handling systems and hard (moving). vacuum applications. water applications. The first vacuum service. 2. List the substance that choice for low torque drive 4. Medical applications: make In the the seal will be exposed to belts. Fluorosilicone: sure an Apple representative Fluorosilicone family, you will and check O-Ring material is aware if medical grade Silicone: In the Silicone family, find compounds that make resistances in Chemical materails are required. you will find compounds that up seals that are unparalleled Compatibility Table(s) listed are excellent as static seals for aerospace fuel systems in the Apple Seal Design in extreme temperature and auto fuel emission control Guide. conditions. systems. 3. List ALL factors of seal application and check material performance. The most commonly used durometer is 70. Although other durometers are offered, availability may be limited due to processing or shrinkage factors. Apple Temperature Material Durometers Range** Materials Designation (Shore A) (Dry Heat Only) Description Presently the seal industry’s most widely used elastometer. Nitrile Buna-N/Nitrile (NBR) BN 40 thru 90 -40 to +257° F combines excellent resistance to petroleum-based oils and fuels, -40 to +125° C silicone greases, hydraulic fluids, water and alcohols. It has a good balance of such desirable working properties as low compression set, high tensile strength and high abrasion resistance. Features good resistance to such polar solvents as ketones (MEK & Acetone). EPM/EPDM is also highly recommended for effective Ethylene-Propylene (EPM/EPDM) EP 40 thru 90 -40 to +275° F resistance to steam (to 400° F), hot water, silicone oils and -40 to +135° C greases, dilute acids and alkalies, alcohols and automotive brake fluids. Properly compounded, Ethylene Propylene can provide extended temperature range of -76°F to +350°F. Especially resistant to high, dry heat in primarily static Silicone (Mq; Pmq; Vmq; Pvmq) SL 25 thru 80 -85 to +400° F applications. Silicones are fungus resistant, odorless, tasteless, -65 to +230° C non-toxic elastomers and possess high-resistance to the aging effects of both sunlight and ozone attack. An early developed, oil-resistant substitute for natural rubber, Neoprene features moderate resistance to petroleum oils, good Neoprene® (Chloroprene) (CR) CR 40 thru 90 -40 to +250° F resistance to ozone, sunlight and oxygen aging, relatively low -40 to +121° C compression set, good resilience, reasonable cost, and high resistance to attack by Freon® and Ammonia. Combines high-temperature toughness with wide chemical agent compatibility, Fluorocarbon compounds feature excellent Fluorocarbon (Viton®) (Fluorel®) (FKM) VT 55 thru 95 -13 to +446° F resistance to petroleum products and solvents and good high- -25 to +230° C temperature compression set characteristics. Combines the good high and low temperature stability of Silicones with the fuel, oil and solvent resistance of fluorocarbons. Fluorosilicone (Fvmq) FS 40 thru 80 -75 to +400° F FS compounds feature good compression set and resilience -60 to +200° C properties. FS compounds are suitable for exposure to air, sunlight, ozone, chlorinated and aromatic hydrocarbons. *Please check the latest standard for current version. **The temperatures listed are general operating range. 800.828.7745 (U.S. and Canada only) 716.684.6560 or visit applerubber.com Standard O-Rings How to Determine O-Ring Size* Every Standard AS-568* Size in O-Ring size is defined by inside For Sequence in Ordering: Stock: Listed in inches. Includes all diameter and width (cross-section) 1 Size (catalog number) standard I.D.’s from .029” to 26,” and and is listed in both fractional and 2 Durometer and material cross sections (widths) from .040” to decimal dimensions with tolerances. 3 Quantity .275”. Constantly restocked to assure How to Order: The temperatures immediate delivery of any size in Example: listed are general operating ranges for small or large quantities. the entire family of each compound. 110 – 70SLR – 10,000 Simplified Reference Easy to Order: (size – durometer, material and color – quantity) These will vary with specific All the information you need at a compounds and/or length of glance. All sizes listed by ascending exposure to temperature extremes. inside diameter (I.D.) in fractional For example, silicone may still be AND decimal sizes. Standard AS-568* serviceable with limited exposure Uniform Numbering System (order to 700°F. by a single number). We highly recommend that in all Choice of Six Materials as Standard: cases, samples of a specific size and Rubber compounds and options compound should be tested in the Outside diameter of Durometer hardness to satisfy (O.D.) is for application before use in production. practically any service condition. Inside Diamter reference only. Check with our sales staff for other Apple catalog numbers are identical Width (Cross Section) O-Rings are material needs. to the AS-568* Numbering System, specified by I.D. indicating precise I.D. and Width and cross section. Fastest Delivery on O-Rings: Most dimensions of O-Rings in one likely the size and compound you ordering number. require is in our stock of over * Shrinkage Size Adjustment: Various O-Ring 300,000,000 O-Rings. Immediate compounds exhibit different shrinkage rates shipments with no intermediate during molding. The normal O-Ring sizes herein delays. (Remember – with Apple shown are based upon a 70 Durometer Nitrile you can buy direct.) standard. For other O-Ring materials, be sure to *Please check the latest standard for current version. consult your Apple representative. Seal Types and Gland Design O-Ring Gland Design for Dynamic Seals Squeeze Groove Width. ±.005 O-Ring Gland Diametrical Groove Eccentricity Cross Depth Clearance No One Two Radius Max. Section Inches % Max. Backup Backup Backup Rings Ring Rings .040 .031/.033 .004/.012 11-28 .004 .063 – – .005-.008 .002 .050 .039/.041 .006/.014 13-26 .004 .073 – – .005-.008 .002 .060 .047/.049 .008/.016 14-25 .004 .084 – – .005-.008 .002 .070 .055/.057 .010/.018 15-25 .004 .095 .150 .208 .005-.015 .002 .103 .087/.090 .010/.019 10-18 .005 .145 .187 .249 .005-.020 .003 .139 .119/.123 .012/.024 9-17 .006 .185 .222 .301 .005-.030 .004 .210 .183/.188 .017/.032 8.5-15 .006 .285 .338 .428 .005-.050 .006 .275 .234/.240 .029/.047 10.5-17 .007 .375 .440 .579 .005-.060 .008 O-Ring Gland Design for Static Seals Squeeze Gland Groove Width. ±.005 O-Ring Depth Radial Axial Diametrical Groove Eccen- Cross Clearance Radius tricity Section Max. No One Two Max. Inches % Inches % Backup Backup Backup Radial Axial Rings Ring Rings .040 .027-.030 .027-.030 .007-.016 19-37 .007-.016 19-37 .003 .060 – – .005-.008 .002 .050 .035-.039 .034-.038 .008-.018 17-34 .009-.019 19-36 .004 .075 – – .005-.008 .002 .060 .042-.047 .042-.046 .010-.021 18-33 .011-.021 19-33 .004 .090 – – .005-.008 .002 .070 .050-.055 .049-.054 .012-.023 18-32 .013-.024 19-33 .004 .105 .150 .208 .005-.015 .002 .103 .080-.086 .075-.081 .014-.026 14-25 .019-.031 19-29 .005 .146 .182 .244 .005-.020 .003 .139 .110-.116 .100-.108 .019-.033 14-23 .027-.043 20-30 .006 .195 .217 .296 .005-.030 .004 .210 .170-.176 .155-.165 .029-.045 14-21 .040-.060 20-28 .006 .280 .333 .423 .005-.050 .006 .275 .225-.235 .205-.215 .034-.056 13-20 .054-.076 20-27 .007 .350 .435 .574 .005-.060 .008 800.828.7745 (U.S. and Canada only) 716.684.6560 or visit applerubber.com Nominal Reference Actual Dimensions Nominal Reference Actual Dimensions AS-568* AS-568* No. No. I.D. O.D. Width I.D. Tol. W. Tol. I.D. O.D. Width I.D. Tol. W. Tol. -001 1/32 3/32 1/32 .029 ± .004 .040 ± .003 -146 2 5/8 2 13/16 3/32 2.612 ± .020 .103 ± .003 -001 1/2 1/16 1/8 1/32 .070 ± .004 .040 ± .003 -147 2 11/16 2 7/8 3/32 2.675 ± .022 .103 ± .003 -002 3/64 9/64 3/64 .042 ± .004 .050 ± .003 -148 2 3/4 2 15/16 3/32 2.737 ± .022 .103 ± .003 -003 1/16 3/16 1/16 .056 ± .004 .060 ± .003 -149 2 13/16 3 3/32 2.800 ± .022 .103 ± .003 -004 5/64 13/64 1/16 .070 ± .005 .070 ± .003 -150 2 7/8 3 1/16 3/32 2.862 ± .022 .103 ± .003 -005 3/32 7/32 1/16 .101 ± .005 .070 ± .003 -151 3 3 3/16 3/32 2.987 ± .024 .103 ± .003 -006 1/8 1/4 1/16 .114 ± .005 .070 ± .003 -152
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