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 2015 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:/www.sae.org/technical/standards/MAP4919 AEROSPACE RECOMMENDED PRACTICE MAP4919 Issued 1998-05 Reaffirmed 2015-08
5、Fluid Connections, Fittings, Hex Width, Metric RATIONALE MAP4919 has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE :This SAE Metric Aerospace Recommended Practice (MAP) is intended as a guide toward standard practice for selection of nominal hex widths for fittings.1.1 Fie
6、ld of Application :Primarily for fittings which are machined from bar stock and incorporate a hex wrenching surface. The document applies to union fittings (both ends the same size). For reducer fittings, use the hex width for the largest fitting end.2. APPLICABLE DOCUMENTS :The following publicatio
7、ns form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and references cited
8、 herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.2.1 SAE Publications :Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.MAP1201 Hexagon Bar, Machined F
9、lat and Forged Wrenching Flat Sizes for Fluid Fittings2.2 ANSI Publications :Available from ANSI, 11 West 42nd Street, New York, NY 10036-8002.ANSI Y14.5M Dimensioning and TolerancingSAE INTERNATIONAL MAP4919 Page 2 of 3 3. TECHNICAL REQUIREMENTS :3.1 Design and Fabrication :3.1.1 Dimensions : Refer
10、 to Figure 1 and Table 1. For sizes not listed in the table, the hex width can be determined by the following empirical equation: hex width = hex size x .144 + 2.178 rounded .x.FIGURE 1 - Fitting Hex WidthTABLE 1 - DimensionsHexSizeDN A NominalHexSizeDN A NominalHexSizeDN A Nominal04 3.3 14 4.7 28 6
11、.805 3.4 16 5.0 32 7.306 3.6 18 5.308 3.9 20 5.610 4.2 22 5.912 4.4 25 6.3SAE INTERNATIONAL MAP4919 Page 3 of 3 4. NOTES :4.1 Break Edges :Break edges 0.1 to 0.4 unless otherwise specified.4.2 Dimensions :Dimensions in millimeters. Unless otherwise specified, tolerances: linear dimensions 0.25, angular dimensions 5.4.3 Refer to MAP1201 for typical dimensions across hex flats.4.4 Key Words :Aerospace, fluid connections, fittings, hex width, wrenchingPREPARED BY SAE SUBCOMMITTEE G-3B, AEROSPACE FITTINGS OF COMMITTEE G-3, AEROSPACE COUPLINGS, FITTINGS, HOSE, AND TUBING ASSEMBLIES
