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Designation F3348 − 19Standard Specification forPlastic Press Insert Fittings with Factory AssembledStainless Steel Press Sleeve for SDR9 Cross-linkedPolyethylene PEX Tubing1This standard is issued under the fixed designation F3348; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon ´ indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers plastic press insert fittings withfactory assembled stainless steel press sleeves incorporating 3view holes and a tool locator ring. These fittings are for usewith cross-linked polyethylene PEX tubing in nominal sizes3⁄8,1⁄2,3⁄4,1,11⁄4,11⁄2, and 2 that meet the requirements forSpecification F876 or F3253. These fittings are intended foruse in 100 psi 690 kPa cold- and hot-water distributionsystems operating at temperatures up to and including 180 °F82 °C. Included are the requirements for material, moldedpart properties, performance, workmanship, dimensions, andmarkings to be used on the fittings and sleeves. The compo-nents covered by this specification are intended for use inresidential and commercial, hot and cold, potable water distri-bution systems as well as sealed central heating, includingunder-floor heating/cooling systems, and residential fire sprin-kler systems.1.2 UnitsThe values stated in inch-pound units are to beregarded as standard. The values given in parentheses aremathematical conversions to SI units that are provided forinformation only and are not considered standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade TBT Committee.2. Referenced Documents2.1 ASTM Standards2A269/A269M Specification for Seamless and Welded Aus-tenitic Stainless Steel Tubing for General ServiceD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsD6394 Specification for Sulfone Plastics SPE92 Test Methods for Vickers Hardness and Knoop Hard-ness of Metallic MaterialsF412 Terminology Relating to Plastic Piping SystemsF876 Specification for Crosslinked Polyethylene PEX Tub-ingF877 Specification for Crosslinked Polyethylene PEX Hot-and Cold-Water Distribution SystemsF3253 Specification for Crosslinked Polyethylene PEXTubing with Oxygen Barrier for Hot- and Cold-WaterHydronic Distribution Systems2.2 NSF/ANSI Standards3Standard 14 Plastic Piping Components and Related Mate-rialsStandard 61 Drinking Water System Components-HealthEffectsStandard 372 Drinking Water System Components-LeadContent2.3 PPI Standards4PPI TR-3 Policies and Procedures for Developing Hydro-static Design Basis HDB, Pressure Design Basis PDB,Strength Design Basis SDB, and Minimum RequiredStrength MRS Ratings for Thermoplastic Piping Mate-rials or Pipe1This test method is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.10 on Fittings.Current edition approved April 1, 2019. Published April 2019. Originallyapproved in 2018. Last previous edition approved in 2018 as F3348–18. DOI10.1520/F3348–192For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.3Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., AnnArbor, MI 48105, http//www.nsf.org.4Available from Plastics Pipe Institute PPI, 105 Decker Court, Suite 825,Irving, TX 75062, http//www.plasticpipe.org.*A Summary of Changes section appears at the end of this standardCopyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade TBT Committee.13. Terminology3.1 DefinitionsUnless otherwise specified, definitions, ab-breviations and initialisms are in accordance with TerminologyF412 and Terminology D1600.3.2 Definitions3.2.1 plastic press insert fitting, nA type of piping com-ponent that is pushed into the open end of the plastic tubing andattaches by mechanically pressing and deforming an outerstainless steel sleeve over the outside diameter of the plastictubing. The seal is realized between the outer diameter of theinsert fitting and the inner diameter of the plastic tubing.Mechanical pressing is achieved by the use of press tool.3.2.2 press sleeve, nCylindrical shaped stainless steel ringwhich is compressed with a pressing tool while located overthe PEX tubing securing it permanently to the underlying insertfitting.3.2.3 press tool, nA device by which the stainless sleeveis compressed by a forming die that is radially closed down onthe press sleeve by either hand powered or electro-mechanicalpressing action.4. Classification4.1 This specification governs one class of fittings andstainless steel press sleeve suitable for use PEX tubing thatmeets either the requirements of Specifications F876 or F3253.5. Materials and Manufacture5.1 MaterialFittings shall be molded from sulfone plasticSP as specified in Specification D6394. The material shall beunreinforced polyphenylsulfone blends group 03, Class 1,grade 2 or reworked plastic in accordance with 5.1.1.NOTE 1Since fittings specified by this standard will be used inhot-and-cold water plumbing systems, a material used to manufacturefittings in accordance with this specification must demonstrate qualitiesconsistent with that application in addition to the performance require-ments of this specification. Those qualifying characteristics include, butare not limited to, an established hydrostatic design basis HDB or stressdesign basis SDB in accordance with PPI TR-3 or similar rating and ademonstration of resistance to the long-term effects of those chemicalsnormally found in potable water at the maximum temperature stated in thisspecification.5.1.1 Rework MaterialClean rework material of the samecommercial designation, generated from the manufacturer’sown production may be used by the same manufacturer,provided the fittings meet all of the requirements of thisspecification. Reworked material shall not be introduced at aratio exceeding 25 .5.2 Press SleevesPress sleeves shall be made from Speci-fication A269/A269M UNS S30400 or S31600 stainless steeland have an allowable hardness of 130 6 20 HV5 according toTest Method E92.5.3 Potable Water RequirementsProducts intended for thetransport of potable water shall be evaluated, tested andcertified for conformance with NSF/ANSI Standard 61 or thehealth effects portion of NSF/ANSI Standard 14 by an accept-able certifying organization when required by the regulatoryauthority having jurisdiction.6. Molded Part Properties6.1 Insert CrushThe fitting insert shall not crack, split, orshatter when tested in accordance with 10.1.6.2 SplayThe molded part shall be free of visible splayexcepting some slight blushing at the gate location.6.3 FlashThere shall be no measureable flash allowed.6.4 MismatchMismatch shall be limited to a maximum of0.002 in.7. Requirements7.1 GeneralAll performance tests shall be performed onassemblies of fittings, press sleeves, and PEX tubing. FittingsTABLE 1 Polymer Insert Dimensions and TolerancesCNTS AA±BE±CDD±E±FH r ±in. in. in. in. in. in. in. in. max in. in. in.3⁄8 0.340 0.004 0.201 0.012 0° - 10° 0.307 0.012 0.344 0.008 15° - 25° 0.091 0.012 0.0041⁄2 0.469 0.004 0.311 0.012 0° - 10° 0.437 0.012 0.344 0.008 15° - 25° 0.187 0.012 0.0043⁄4 0.658 0.004 0.480 0.012 0° - 10° 0.626 0.012 0.344 0.008 15° - 25° 0.187 0.012 0.0041 0.852 0.004 0.661 0.012 0° - 10° 0.823 0.012 0.472 0.008 N/A N/A 0.051 0.00411⁄4 1.034 0.004 0.807 0.012 0° - 10° 1.004 0.012 0.689 0.008 N/A N/A 0.079 0.00411⁄2 1.223 0.004 0.941 0.012 0° - 10° 1.193 0.012 0.689 0.008 N/A N/A 0.079 0.0042 1.579 0.004 1.244 0.012 0° - 10° 1.543 0.012 0.677 0.008 N/A N/A 0.079 0.004NTS J ± G ± K ± L I ± TBR±Xin. in. in. in. in. in. Min, in. in. in. Min. in. in. in.3⁄8 0.110 0.008 0.087 0.008 0.378 0.016 0.512 0.043 0.008 0.047 0.008 0.004 35° - 45°1⁄2 0.110 0.008 0.087 0.008 0.378 0.016 0.512 0.043 0.008 0.059 0.008 0.004 35° - 45°3⁄4 0.110 0.008 0.087 0.008 0.378 0.016 0.512 0.043 0.008 0.067 0.008 0.004 35° - 45°1 0.118 0.008 0.118 0.008 0.500 0.016 0.669 0.059 0.008 0.075 0.008 0.004 35° - 45°11⁄4 0.126 0.008 0.165 0.008 0.720 0.016 0.906 0.083 0.008 0.091 0.008 0.004 35° - 45°11⁄2 0.126 0.008 0.165 0.008 0.720 0.016 0.906 0.083 0.008 0.118 0.008 0.004 35° - 45°2 0.126 0.008 0.165 0.008 0.720 0.016 0.906 0.083 0.008 0.142 0.008 0.004 35° - 45°ARib outside diameter shall be measured individually.BApplies to entire fitting not just to insert area, except for the area identified within the “H” dimension.CDirectional fittings shall be designed with sufficient overall dimensions to allow proper use of press tool without interference with previously completed press on the samefitting.DLead chamfer area is not considered a rib.EID “B” shall be maintained through the insert length “L”.F3348 − 192FIG. 1 Polymer Insert DimensionsFIG. 1A Flash and Mismatch created by Imperfection in Die Half InterfacesFFIG. 1B Total Flash and MismatchFFIG. 1FFig.1A and Fig.1B are a graphic definition of flash and mismatch created by imperfection in die half interfaces. See 7.3. The total mismatch is assumed to be thedifference between “X” and “Y.” These dimensions may be measured with appropriate calipers or micrometers.F3348 − 193and press sleeves shall meet the material and dimensionalrequirements of this specification. PEX tubing shall meet therequirements of Specification F876 or F3253. Use separate setsof assemblies for each performance test requirement.7.2 Fittings manufactured according to this specification foruse with PEX tubing shall comply with Specification F877Requirements, Test Methods, and Retest and Rejection.7.3 DimensionsThe dimensions and tolerances of fittingsand press sleeves shall be in accordance with Table 1 and Fig.1, Fig. 1A, and Fig. 1B and Table 2 and Fig. 2 when measuredin accordance with 7.3.1. There shall be no measurable flashallowed. Mismatch shall be limited to a maximum of 0.002 in.7.3.1 MeasurementsAny randomly selected fitting orfittings, and press sleeve or press sleeves, shall be used todetermine dimensions. Measurements shall be made in accor-dance with Test Method D2122, except when measuringdiameters of the after pressed sleeves, which shall be measuredperpendicular to the jaw closure plane as shown in Fig. 4 andshall be in accordance with Table 3.7.3.2 Directional Fitting Outlets Angular AlignmentThemaximum angular variation of any molded outlet shall notexceed 1° off the true centerline axis of any adjacent outlet.7.4 Factory Assembled Press SleevesStainless steel presssleeves shall be assembled by the fitting manufacturer. Fittingdesign shall allow for either permanently attached non-removable press sleeves or snap-in-place removable presssleeves.7.5 Pressing Tool Locating FeatureThe fitting designshall provide a lateral positioning feature for the pressing toolin order to accurately locate the tool’s pressing profile over thepress sleeve to align the press bands directly over the centerlineof their respective primary sealing barb groups. After pressing,the resulting pressing bands shall be centered over each of theirrespective primary sealing barb groups within the allowedoffset dimension “M” given in Table 3. See Fig. 3.7.5.1 Pressing Profile Location and AlignmentCompliance with 7.5 will require either machining a cross-section of a completed press assembly and taking directmeasurements or by taking depth measurements from the frontface of the press sleeve to the end of the insert barb and to themiddle of each pressing band width PBW. See Fig. 3.8. Workmanship, Finish, and Appearance8.1 The sealing surfaces of the insert shall be smooth andfree of foreign material. The fitting walls shall be free ofcracks, holes, blisters, voids, foreign inclusions, or otherdefects that are visible to the unaided eye and that affect thewall integrity.8.2 The molded insert shall be free of flash.8.3 Flash, mismatch, and witness mark requirements for theinsert shall be in accordance with 6.3, 6.4, and 7.3.8.4 Stainless steel press sleeves finish and appearance shallbe of bright polished appearance and void of anydiscolorations, visible seams, dents, nicks, or scratches.9. Assembly9.1 Pressing JointsInsert fittings shall be joined by thecompression of a stainless steel sleeve around the outercircumference of the tubing, forcing the tubing material intoannular spaces formed by ribs on the fitting. Insert fittings andpress sleeves shall meet the dimensional and material require-ments of this standard. PEX tubing shall meet the requirementsof either Specification F876 or F3253. The dimensions of the*EThe three view holes’ diameter and location per the fitting manufacture’s specifications.FIG. 2 Un-Pressed Stainless Steel Sleeve DimensionsTABLE 2 Press Sleeve Dimensions before PressingA,B,C,DNTS ID ± Wall ±in. in. in. in.3⁄8 0.512 0.006 0.023 0.0031⁄2 0.636 0.006 0.023 0.0033⁄4 0.892 0.006 0.023 0.0031 1.140 0.006 0.023 0.00311⁄4 1.386 0.006 0.031 0.00311⁄2 1.636 0.006 0.031 0.0032 2.138 0.006 0.031 0.003AAll dimensions shall be measured with appropriate micrometers, such as pin orball micrometers for wall and outside diameter micrometers with flat anvils orvernier calipers shall be used to measure outside diameters and width of sleeves.BThe average measurement is obtained from measurements taken in at least twodifferent circumferential positions which are equally spaced around thecircumference.CThe average wall measurement is obtained from measurements taken in eightdifferent positions which are equally spaced around the circumference.DThe maximum out-of-roundness of the press sleeve shall not inhibit assemblywith the fitting and tubing. The press sleeve dimensions after pressing shall complywith Table 3.F3348 − 194press sleeve after it has been pressed
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