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, including any patent infringement arising there
2、from, 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 2017 SAE International All rights reserved. No part of this p
3、ublication 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 (inside USA and Canada) Tel: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/J512_201705 SURFACE VEHICLE STANDARD J512 MAY2017 Issued 1912-06 Revised 1997-04 Reaffirmed 201
5、7-05 Superseding J512 APR1997 Automotive Tube Fittings RATIONALE J512 has been reaffirmed to comply with the SAE Five-Year Review policy. 1. Scope This SAE Standard covers complete general and dimensional specifications for the various types of tubefittings intended for general application in the au
6、tomotive, appliance, and allied fields. See SAE J1131 for theperformance requirements of reusable (push to connect) fittings intended for use in automotive air brake systems.Flare type fittings shall be as specified in Figures 1 to 4 and Tables 3 to 5.N OTE For sizes 3/16 to 3/8 and 1/2 to 3/4 the f
7、lare type fittings depicted in Figures 1A to 3C are identical with thecorresponding refrigeration tube fittings specified in SAE J513. Special size combination fittings 3/16 to3/8 and 1/2 to 3/4 shall be as specified in SAE J513.Inverted flared type fittings shall be as specified in Figure s 5 to 11
8、 and Tables 3, 6, 7, 8, and 9. Gages and gagingprocedures pertaining to inverted flared tube fittings are given in Appendix A.N OTEThe seat dimensions specified in Table 6 are predicated on practical threading limitations in steel fittingsand use of these fittings with double flared tubing. Therefor
9、e, wherever purchasers contemplate usingthese fittings with single flared tubing, it is recommended that the optional inverted flare nut (Figure 9A) beused.Tapered sleeve compression type fittings intended for general use with annealed copper alloy tubings shall be asspecified in Figures 12 to 17 an
10、d Tables 3, 10, 11, and 12. To assure satisfactory performance, spherical sleevecompression type fitting components (see SAE J246) should not be intermixed with tapered sleeve compressiontype fitting components when assembling connections in areas where both types are available.Dimensions of single
11、and double 45 degree flares on tubing to be used in conjunction with flared and invertedflared fittings are given in Figure 2 and Table 3 of SAE J533.The following general specifications supplement the dimensional data for all types of fittings contained in Tables 3to 13 with respect to all unspecif
12、ied detail.2. References2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein.The latest issue of SAE publications shall apply.2.1.1 SAE P UBLICATIONS Available from SAE, 400 Commonwealth Drive, Warrendale , PA 15096-0001.SAE J246 Spheri
13、cal and Flanged Sleeve (Compression) Tube FittingsSAE J476 Dryseal Pipe ThreadsSAE J513 Refrigeration Tube FittingsSAE J533Flares for TubingSAE J846 Coding Systems for Identification of Fluid Conductors and Connectors2.1.2 ANSI P UBLICATION Available from ANSI, 11 West 42nd Street, New York, NY 1003
14、6-8002.ANSI B1.1 Screw Threads2.1.3 ASTM P UBLICATION Available from ASTM, 1916 Race Street, Philadelphia, PA 19103-1187.ASTM B 117 Method of Salt Spray (Fog) Testing3. General Specificati ons3.1 Size DesignationsFitting sizes are designated by the corresponding outside diameter of the tubing for th
15、evarious types of tube ends and by the corresponding standard nominal pipe size for pipe thread ends.3.2 Dimensions and TolerancesExcept for nominal sizes and thread specifications, dimensions and tolerancesare given in both SI units and U.S. customary as designated. Tabulated dimensions shall apply
16、 to the finishedparts, plated or otherwise processed, as specified by the purchaser. Unless otherwise specified, the maximumand minimum across flats dimensions shall be within the commercial tolerance of bar or extruded stock fromwhich the fittings are produced. The minimum across corners dimensions
17、 of hexagons shall be 1.092 times thenominal width across flats, but shall not result in a side flat width less than 0.43 times the nominal width acrossflats.Unless otherwise specified, tolerance on hole diameters designated drill in the dimensional tables shall be astabulated in Table 1:TABLE 1DIME
18、NSIONS AND TOLERANCESTolerance Tolerance Tolerance Toleranceon on on onDrill Drill Hole Hole Hole HoleSize Size Diameter Diameter Diameter DiameterRange Range Plus Plus Minus Minusmm in mm in mm in0.343 thru 4.699 0.0135 thru 0.1850 0.08 0.003 0.05 0.0024.762 thru 6.299 0.1875 thru 0.2480 0.10 0.004
19、 0.05 0.0026.350 thru 19.050 0.2500 thru 0.7500 0.15 0.006 0.08 0.00319.251 thru 25.400 0.7579 thru 1.0000 0.18 0.007 0.10 0.004Tolerance on all dimensions n ot otherwise limited shall be 0.25 mm ( 0.010 in). Angular tolerance on axis of endson elbows, tees, and crosses shall be 2.50 degrees for siz
20、es up to and including 3/8 in, and 1.50 degrees forsizes larger than 3/8 in.Integral internal seats in inv erted flared tube fittings shall be concentric with straight thread pitch diameters within0.13 mm (0.005 in) full indicator reading (FIR). Unless otherwise specified, fitting seats shall be con
21、centric withstraight thread pitch diameters within 0.25 mm (0.010 in) full indicator reading (FIR).SAE INTERNATIONAL J512 MAY2017 Page 2 of 37_ Where so illustrated and not otherwise specified, hexagon corners shall be chamfered 30 degrees 5 degrees toa diameter equal to the nominal width across fla
22、ts, with a tolerance of 0.41 mm ( 0.016 in); or 0.41 where designpermits, corners may be chamfered to the diameter of the abutting surface provided the length of chamfer doesnot exceed that produced by the 30 degree chamfer previously described.3.3 Passages Where passages in straight fittings are ma
23、chined from opposite ends, the offset at the meeting pointshall not exceed 0.38 mm (0.015 in). The cross-sectional area at the junction of passages in angle fittings shallnot be less than that of the smallest passage. Where the passage is specified as a maximum, or as tap drilldiameter or less, the
24、minimum shall be no less than the minimum diameter of the smallest passage in the fitting.3.4 Wall Thickness Unless otherwise designated, the wall thickness at any point on fittings shall not be less thanthe thickness established by the specified dimensions, tolerances, and eccentricities for inner
25、and outer surfaces.3.5 ContourDetails of contour shall be optional with the manufacturer, provided the tabulated dimensions aremaintained and serviceability of the fittings is not impaired. Wrench flats on elbows and tees shall be optional.Where extruded or forged shapes are reduced to conserve mate
26、rial, the wall thickness, unless otherwisespecified, shall not be less than the respective minimum values tabulated in Table 2:TABLE 2WALL THICKNESSWall Wall Wall WallThickness Thickness Thickness ThicknessNom Min Min Min MinTube Extruded Extruded Forged ForgedOD Shapea Shapea Shape Shapein mm in mm
27、 in1/8 1.0 0.04 1.52 0.0603/16 1.0 0.04 1.78 0.0701/4 1.0 0.04 1.90 0.0755/16 1.3 0.05 1.90 0.0753/8 1.3 0.05 2.29 0.0907/16 1.5 0.06 2.29 0.0901/2 1.5 0.06 2.29 0.0909/16 1.5 0.06 2.29 0.0905/8 2.0 0.08 2.54 0.1003/4 2.0 0.08 2.54 0.1007/8 2.0 0.08 3.05 0.1201 2.0 0.08 3.05 0.120a Applies to reduct
28、ion to one plane of shape only.3.6 Straight ThreadsUnified Standard Class 2A external threads and Class 2B internal threads with minordiameters, where specified, modified to Class 3B limits, shall apply to plain finish ( unplated) fittings of all types. Forexternally threaded parts with additive fin
29、ish, the maximum diameters of Class 2A may be exceeded by theamount of the allowance; that is, the basic diameters (Class 2A maximum diameters plus the allowance) shallapply to an externally threaded part after plating. For internally threaded parts with additive finish, the Class 2Bdiameters and mo
30、dified minor diameters shall apply after plating.The pitch diameter tolerance shall be the same as the corresponding diameter-pitch combination and the class ofthe Unified coarse and fine thread series or for special diameter-pitch combinations shall be based on diameter,pitch, and a length of engag
31、ement of 9 times the pitch. See ANSI B1.1.SAE INTERNATIONAL J512 MAY2017 Page 3 of 37_ Where external threads are produced by roll threading and the body is not undercut, the unthreaded portion ofbody adjacent to the shoulder may be reduced to the minimum pitch diameter.External threads shall be cha
32、mfered to the diameter of abutting surfaces, or to the diameters specified, to producea length of chamfered or partial thread equivalent to 3/4 to 1-1/4 times the pitch (rounded to a three-placedecimal).Internal threads shall be countersunk 90 degrees, included angle, to the diameters specified to t
33、he dimensionaltables.3.7 Thread Eccentricity TolerancesThe various thread elements of Class 2A external and Class 2B, modified,internal threads on tube fittings shall be concentric within the following limitations:3.8 External Thread (Screw)3.8.1 Where screw pitch diameter is maximum and screw major
34、 diameter is maximum, these two thread elementsmust be concentric. However, if the screw major diameter is out-of-round, undersize, these two thread elementsmay be eccentric at the point of out-of-roundness, a full indicator reading amount equal to the screw majordiameter tolerance.3.8.2 Where screw
35、 pitch diameter is minimum and screw major diameter is maximum, these two thread elementsmay be eccentric a full indicator reading amount equal to the screw pitch diameter tolerance.3.8.3 Where screw pitch diameter is maximum and screw major diameter is minimum, these two thread elementsmay be eccen
36、tric a full indicator reading amount equal to the screw major diameter tolerance.3.8.4 Where screw pitch diameter is minimum and screw major diameter is minimum, these two thread elements maybe eccentric a full indicator reading amount equal to the sum of the screw pitch diameter tolerance and the s
37、crewmajor diameter tolerance.3.9 Internal Thread (Nut)3.9.1 Where nut pitch diameter is minimum and nut minor diameter is minimum, these two thread elements must beconcentric. However, if the nut minor diameter is out-of-round, oversize, the two thread elements may beeccentric at the point of out-of
38、-roundness, a full indicator reading amount equal to the nut minor diametertolerance.3.9.2 Where nut pitch diameter is maximum and nut minor diameter is minimum, these two thread elements may beeccentric a full indicator reading amount equal to the nut pitch diameter tolerance.3.9.3 Where nut pitch
39、diameter is minimum and nut minor diameter is maximum , these two thread elements may beeccentric a full indicator reading amount equal to the nut minor diameter tolerance.3.9.4 Where nut pitch diameter is maximum and nut minor diameter is maximum, these two thread elements may beeccentric a full in
40、dicator reading amount equal to the sum of the nut pitch diameter tolerance and the nut minordiameter tolerance.3.10 Pipe Threads Pipe threads, unless there is specific authorization to the contrary, shall conform to the DrysealAmerican Standard Taper Pipe Thread (NPTF). At purchasers option, the pi
41、pe thread on automotive tube fittingsmay be shortened in conformity with the SAE Short Dryseal Taper Pipe Thread (PTF-SAE Short). Specificationsfor pipe threads are given in detail in SAE J476.SAE INTERNATIONAL J512 MAY2017 Page 4 of 37_ The length of full form external thread shall not be shorter t
42、han L 2, plus one pitch (thread) for Dryseal NPTF andL 2, for Dryseal PTF-SAE Short, except that where thread is cut through into a relieved body or undercut on thefitting, the minimum full thread length may be reduced by one pitch (thread).Where external pipe threads are produced by roll threading,
43、 the diameter of the unthreaded portion of shankadjacent to shoulder may be reduced to the E, basic diameter.The tube fitting dimensions tabulated herein are based on length of the Dryseal American Standard Taper PipeThread (NPTF) , it being the consensus of manufacturers and users that trouble-free
44、 assembly cannot be assuredunless a full length is used. However, the tap drill depths and overall lengths specified in the tables for fittings withinternal taper pipe threads are not consistent with the tap drill depths and overall thread lengths of the DrysealAmerican Standard Taper Pipe Threads (
45、NPTF) given in Table A2, Appendix A, of SAE J476. The full lengthDryseal American Standard Taper Pipe Taps specified in Table B2 of SAE J476 cannot be used, as the tap drilldepths and overall lengths of the fittings have been reduced to the minimum required by bottoming taps toproduce standard full
46、length thread. The deviations described previously are peculiar to these tube fittings and asspecial tooling is required, caution should be exercised in specifying such deviations for any other products.External pipe threads shall be chamfered from the diameters s hown in Table 13 to produce the spe
47、cified length ofchamfered or partial thread. Internal pipe threads shall be countersunk 90 degrees, included angle, to thediameters shown in Table 13.3.11 Material and Manufacture All types of automotive tube fittings shall be made from brass or steel as specifiedby the purchaser and, at manufacture
48、rs option and in accordance with his process of manufacture, may be milledfrom the bar or forged. Brass shall be UNS C36000 (half-hard), UNS C34500, or UNS C35000 for bar or extrudedstock and UNS C37700 for forgings.3.12 FinishThe external surfaces and threads of all carbon steel parts shall be plated or coated with a suitablematerial that passes a 72 h salt spray test in accordance with A
