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/MAP1201 AEROSPACE RECOMMENDED PRACTICEMAP1201 Issued 1994-07 Reaffirmed 2015-08 T
5、olerances, Hexagon Bar, Machined Flat and Forged Wrenching Flat Sizes for Fluid Fittings, Metric RATIONALE MAP1201 has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE:This SAE metric Aerospace Recommended Practice (MAP) lists wrenching surface sizes andtolerances for fluid f
6、ittings which utilize machined or unmachined hex bar dimensions and machined orforged wrenching surfaces across the center body section of shape fittings.2. REFERENCES:2.1 Applicable Documents:There are no referenced publications specified herein.2.2 Related Publications:The following publications a
7、re provided for information purposes only and are not a required part of this document.ANSI/ASME B107.7M Gages, Wrench Opening, ReferenceISO/R286 ISO System of Limits and Fits3. TECHNICAL REQUIREMENTS:3.1 Sizes and Tolerances:The sizes and tolerances across the hex flats and center body section of s
8、hapes for fluid fitting wrenching surfaces shall be as shown in Table 1.SAE INTERNATIONAL MAP1201 Page 2 of 2 TABLE 1 - Size and Tolerances Across Hex Flats and Center Body Section of Shapes for Fluid Fitting Wrenching Surfaces4. NOTES:4.1 Dimensions in millimeters:4.2 Derivation of Tolerances:The m
9、aximum tolerance “E” was determined by calculating the minimum wrench opening to three decimal places as B = W +(.005W + 0.025) in accordance with the General Notes under Table 2 in ANSI B107.7M - 1991 where W is the nominal width of the part dimension. “E” was then set at two decimal places up thro
10、ugh size 14 and one decimal place for larger widths, at a value equal to or no more than 0.1 smaller than “B”. “E” was compared to and does not exceed the maximum tolerance of hex bar stock material. The minimum tolerance for hex flats or machined flats was chosen to match tolerances on published MA
11、 fitting standards, generally h13 up through size 32 and h14 for larger widths per ISO/R286. The minimum tolerance for as forged center sections was chosen as a compromise to give as much tolerance as possible for closed die forgings and still provide a minimum wall thickness necessary to meet pressure and performance test requirements and to minimize fitting weights.4.3 Key Words:Aerospace, fittings, tolerances, wrenching, wrench flatsPREPARED BY SAE SUBCOMMITTEE G-3B, AEROSPACE FITTINGS OFCOMMITTEE G-3, AEROSPACE COUPLINGS, FITTINGS, HOSE, AND TUBING ASSEMBLIES
