1、SURFACE VEHICLESTANDARDJ20 MAR2015Issued 1944-01Reaffirmed 2015-03Superseding J20 JUN2006Coolant System HosesRATIONALEJ20 has been reaffirmed to comply with the SAE five-year review policy.1. ScopeThis SAE Standard covers reinforced and flexible hoses intended for use in water and ethylene glycol-ba
2、sed engine-coolant system applications.2. References2.1 Applicable PublicationsThe following publications form a part of the specification to the extent specified herein. Unless otherwise indicated, the latest revision of SAE publications shall apply.2.1.1 SAE PUBLICATIONSAvailable from SAE, 400 Com
3、monwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.SAE J1231Formed Tube Ends for Hose Connections and Hose FittingsSAE J1508Hose Clamp SpecificationSAE J1610Test Method for Evaluating the Sealing Capability of Hose Connect
4、ions with a PVT Test FacilitySAE J1638Compression Set of Hoses or Solid DiscsSAE J1684Test Method for Evaluating the Electrochemical Resistance of Coolant System Hoses and MaterialsSAE J2370Geometric Dimensions and Tolerancing for Curved HoseSAE J2387Dimensions and Tolerances for Coolant System Hose
5、sSAE J2605Non-Contact Hose Measurement Study 1_SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, in
6、cluding any patent infringement arising therefrom, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.Copyright 2015 SAE Internati
7、onalAll rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE.TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (i
8、nside USA and Canada)Tel: +1 724-776-4970 (outside USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/J20_201503SAE INTERNATIONAL J20 Reaffirmed MAR2
9、015 Page 2 of 182.1.2 ASTM PUBLICATIONSAvailable from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM D 380Methods of Testing Rubber HoseASTM D 395Test Methods for Rubber Property Compression SetASTM D 412Test Method for Rubber Properties in Tensio
10、nASTM D 413Test Methods for Rubber Property Adhesion to Flexible SubstrateASTM D 471Test Method for Rubber Property Effect of LiquidsASTM D 573Test Method for Rubber Deterioration in an Air OvenASTM D 1149Test Method for Rubber Deterioration Surface Ozone Cracking in a Chamber (Flat Specimens)ASTM D
11、 2240Test Method for Rubber Property Durometer Hardness2.1.3 MILITARY SPECIFICATION PUBLICATIONAvailable from Department of Defense Specification, Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094, Tel: 215-697-2179, http:/assist.daps.mil or http:/stin
12、et.dtic.mil.MIL-HDBK-695Rubber Products: Recommended Shelf Life2.1.4 RUBBER MANUFACTURERS ASSOCIATION (RMA) PUBLICATIONAvailable from RMA, 1400 K Street, NW, Suite 900, Washington, DC 20005, Tel: 202-682-4800, www.rma.org.IP-2Hose Handbook2.1.5 ISO PUBLICATIONAvailable from ANSI, 25 West 43rd Street
13、, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org.ISO 9001Quality systemsModel for quality assurance in design, development, production, installation and servicing2.1.6 AUTOMOTIVE INDUSTRY PUBLICATIONAvailable from AIAG, 26200 Lahser Road, Suite 200, Southfield, MI 48034-7100, Tel: 248-358-
14、3570, www.aiag.org.QS 9000Quality System RequirementsSAE INTERNATIONAL J20 Reaffirmed MAR2015 Page 3 of 182.2 Related PublicationsThe following publications are provided for information purposes only and are not a required part of this document.2.2.1 SAE PUBLICATIONSAvailable from SAE, 400 Commonwea
15、lth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.SAE J20-1Coolant Hose (Supplement to SAE J20 for Government Use Replacing Part of MS52130)SAE J20-2Coolant HoseNormal Service Type Convoluted, Wire Support Hose (Supplement to S
16、AE J20 for Government Use Replacing Part of MS51008)3. Definitions of Hose Types3.1 SAE 20R1Heavy-duty type for service in heavy-duty application. This type is available in two wall thicknesses as indicated in 6.3.3.2 SAE 20R2Flexible heavy-duty wire embedded type for the same service as SAE 20R1.3.
17、3 SAE 20R3Heater hose for normal service.3.4 SAE 20R4Radiator hose for normal service.3.5 SAE 20R5Convoluted wire supported type for normal service.3.6 Hose Special Designators for SAE 20RXYX Refers to the hose type. Y designators may be used for hoses with special features. Multiple Y designators m
18、ay be used if needed.3.6.1 HTThis High Temperature designation is for any hose type, SAE 20R1 to SAE 20R5, which is required to operate in an environment above 125 C. (See Section 11.)SAE INTERNATIONAL J20 Reaffirmed MAR2015 Page 4 of 183.6.2 ECThis Electrochemical designation is for any hose type S
19、AE 20R1 to SAE 20R5 which is required to have electrochemical resistance as defined by SAE J1684. (See Section 12.)3.6.3 LTThis Low Temperature designation is for any hose type SAE 20R1 to SAE 20R5 which is required to operate in an environment down to 55 C. (See Section 13.)3.7 Hose ClassesCompound
20、s based on different synthetic rubber grades are specified and designated (see 5.2 for test methods):Class Ahigh-temperature resistantClass Bhigh oil resistantClass Cmedium oil resistantClass D-1low oil resistant, improved serviceClass D-2low oil resistant, standard serviceClass D-3low oil resistant
21、, high-temperature resistant, premium serviceClass Elow oil resistant, fiber elastomer compositePhysical characteristics for each hose class are shown in Table 1.SAE INTERNATIONAL J20 Reaffirmed MAR2015 Page 5 of 18TABLE 1COOLANT SYSTEM HOSE ELASTOMERIC MATERIAL, PHYSICAL PROPERTIESSAE DesignationTy
22、pical ElastomerClass ASiliconeClass BNBRClass CCRClass D1EPDMClass D2EPDMClass D3EPDMClass EEPDM/FiberTypical TemperatureRange, C55 to 175 40 to 10040 to 10040 to 125 40 to 125 40 to 15040 to 125Original PropertiesDurometer, points Shore A55 to 75 55 to 75 55 to 75 55 to 75 55 to 75 55 to 75 65 to 8
23、5Tensile, min, MPa 5.5 8.5 7.0 7.0 5.0 7.0 5.0Elongation, min, % 200 250 200 250 150 250 100Oven Aging Conditions andChange Limits, Hours/C 70/175 70/100 70/100 70/125 70/125 168/150 70/125Durometer, points Shore A+10 +15 +20 +15 +15 +15 +15Tensile, max % 15 15 20 20 20 35 20Elongation, max, % 40 50
24、 50 50 50 65 50Oil Immersion Change LimitsASTM No. 3 Oil or IRM 903(IRM 903 is being phased into replace ASTM No. 3)Hours/C 70/100 70/100 70/100 Volume, max, % 0 to +45 5 to +25 +80 Tensile, max, % 40 20 50 Coolant Immersion (Tube only)Change LimitsHours/at Boiling Point 70 70 70 70 70 168 70Volume,
25、 % 0 to +40 0 to +20 0 to +20 5 to +20 5 to +20 5 to +20 5 to +20Durometer, points ShoreA10 to +10 10 to +1010 to +1010 to +10 10 to +10 10 to +1010 to +10Tensile, max, % 30 20 20 20 20 20 20Elongation, max, % 25 40 40 50 25 25 25Compression Set C 125 100 100 125 125 125 12570 h, max, % 40 50 75 75
26、85 75 85Cold Flexibility (C)(1) 40 40 40 40 40 40 401. LT designator extends the low temperature flexibility to 55 C.SAE INTERNATIONAL J20 Reaffirmed MAR2015 Page 6 of 183.8 MarkingThe outer cover will be printed with the designation SAE 20RXY (the X being the hose type and Y any special designator(
27、s) such as “LT”), class, size of the inside diameter in millimeters, hose manufacturers code marking, and any other identification as agreed upon between user and manufacturer/supplier. It is recommended that this marking shall appear on the outer cover of the hose at intervals not greater than 380
28、mm.3.8.1 SMALL ID OR SHORT HOSEIf there is insufficient space on the hose for the required marking due to size or configuration, the marking shall be agreedupon by the customer and the manufacturer/supplier.4. Dimensional RequirementsGeometric Dimensioning and Tolerancing requirements are outlined i
29、n SAE J2370. The following requirements are minimal standards:4.1 Tube and Cover ThicknessMinimum thickness shall be 1.6 mm for the tube and 0.8 mm for the cover.NOTEThis requirement does not apply for hoses without distinctive tube and cover construction.4.2 Length Tolerancea. Straight HoseUnless o
30、therwise specified by the customer or manufacturer, Commercial Tolerances will be used. See Table 2.TABLE 2LENGTH TOLERANCELengthmmPrecision TolerancemmCommercial Tolerancemm0300 3.2 +9.73.2300 1% +3%1%b. Curved HoseThe tolerances on arm lengths, measured from end to intersection of nearest centerli
31、ne, shall be as shown in Table 3.SAE INTERNATIONAL J20 Reaffirmed MAR2015 Page 7 of 18TABLE 3TOLERANCE ON ARM LENGTHArm LengthmmPrecision TolerancemmCommercial Tolerancemm0300.0 4.0 6.4300.1610.0 4.8 7.2610.1910.0 6.4 9.7910.11220.0 9.7 11.21220.11830.0 12.7 15.9over 1830 1% 2%4.3 General Layout Tol
32、erances, Curved HoseDimensions locating bend intersections and centerline radii are to establish the theoretical design centerline of the hose. Actual outside contour of hose must be held within a total range of 9.6 mm of all planes with respect to theoretical outside contour of hose. For hose check
33、, hose ends should first be placed in theoretical design position before checking (hose may have to be flexed to correct for any distortion caused by handling or during shipment). SAE arm length tolerances shall apply.Tolerances apply to all arm and body lengths in addition to contour tolerances. Di
34、mensions covering more than one arm or body length are reference only and have no tolerances. The wall thickness within bends of a curved hose may differ from the wall thickness of the straight by no more than 33%.When an alignment mark is required for assembly operations, the basic identifier in Fi
35、gure 1 is recommended:FIGURE 1ALIGNMENT MARKLocation of the alignment mark and/or additional information shall be determined by the customer and the manufacturer.4.4 Enlarged EndsWhen the ID of one end of the hose is enlarged, normally the ID of the enlarged end should not exceed the ID of the rest
36、of the hose by more than 33%. Enlarged ends should be considered arm lengths for tolerance purposes. The wall thickness normally changes with enlarged ends.SAE INTERNATIONAL J20 Reaffirmed MAR2015 Page 8 of 184.5 End SquarenessAll points on the hose end surface must lie within a tolerance zone consi
37、sting of two parallel planes perpendicular to the hose axis. The tolerance zone is determined by Table 4.TABLE 4END SQUARENESSHose ID Precision Tolerance Commercial Tolerance25.4 mm and larger 10% of ID 15% of IDsmaller than 25.4 mm2.54 mm 3.75 mm4.6 Finish and Roundness on ConnectionsUsers of coola
38、nt hose should take every precaution to obtain connections as smooth and round as practical. (Reference SAE J1231)4.7 ClampsRefer to SAE J1508 for available clamp types.5. Physical Test Requirements and Procedures5.1 Finished Product5.1.1 ADHESIONWhen applicable, use test procedure ASTM D 413. The m
39、inimum requirement is 1400 N/m between all elastomer or elastomer-coated plies.5.1.2 COLD FLEXIBILITYThe following procedure shall be used:For hose 25.4 mm ID and smaller, specimen shall consist of a complete hose of length sufficient to perform bend test described as follows: the hose shall be plac
40、ed in a cold box for 5 h at the temperature specified in Table 1. The hose shall then be flexed in the cold chamber through 180 degrees from the centerline to a diameter of ten times the maximum outside diameter of the hose within 4 s. The hose shall not fracture and shall not show any cracks or bre
41、aks in the tube or cover.For hose larger than 25.4 mm ID, specimens are to be 25.4 mm long sections of the complete hose. The specimen and test fixture shall be placed in a cold box for 5 h at the temperature specified in Table 1. The specimen is then compressed to 50% of its original inside diamete
42、r between parallel plates within 4 s. The specimen shall not crack or break. The testing fixture shall be in the cold box during the entire test.NOTEFor LT hose, refer to Section 13 for specific cold flexibility requirements.SAE INTERNATIONAL J20 Reaffirmed MAR2015 Page 9 of 185.1.3 OZONE TEST AND R
43、EQUIREMENTSThe following test and requirements apply:When applicable, use test procedure ASTM D 1149.For hose 25.4 mm ID and smaller, a specimen of hose of sufficient length shall be bent around a mandrel with an outside diameter equal to eight times the specified OD of the sample. The two ends shal
44、l be tied at their crossing with enameled copper or aluminum wire. After mounting, the specimen shall be allowed to rest in an ozone-free atmosphere for 24 h at standard laboratory test temperature. The mounted specimen shall be placed in a test chamber containing ozone at a partial pressure of 50 m
45、Pa 5 mPa at a temperature of 40 C 1 C.After 100 h of exposure, the specimen shall be removed and allowed to cool to standard laboratory test temperature and then be inspected visually under 7X magnification. The sample must not show any cracks except for the area immediately adjacent to the wire, wh
46、ich shall be ignored.For hose larger than 25.4 mm ID, prepare a specimen by cutting a strip of the whole hose 12.7 mm x 100 mm and tie specimen (cover out) around a 12.7 mm diameter mandrel. Condition in the same manner as specified previously for the whole hose and apply the same conditions and req
47、uirements. This test applies to the cover only and cracks in the exposed tube or cut edges of the cover shall be ignored.5.1.4 KINK TESTThis test applies to SAE 20R3 hose only. (Not recommended for formed hoses.)5.1.4.1 Test ProcedureCondition specimen length of hose at standard laboratory test temp
48、erature for at least 2 h. Measure the minimum OD at the approximate center of the specimen length. When a sufficient length of hose is available, it is permissible and suggested that a length in excess of the specimen length be used in an effort to minimize the handling variable and overbending. Insertone end of the hose into one hole of the specified test fixture, carefully bend the hose (in direction of natural curvature) and insert the other hose end into the second test fixture hole. Do not overbend or bend hose with sharp motion to prevent excessive kinking or collapse. With
