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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2013 SAE International All rights reserved. No part of this publication m
3、ay 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: +1 724-776-4970 (outside U
4、SA) 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/AMS2243K AEROSPACE MATERIAL SPECIFICATION AMS2243 REV. K Issued 1945-05 Reaffirmed 2000-10 Re
5、vised 2013-06 Superseding AMS2243J Tolerances Corrosion and Heat-Resistant Steel Tubing RATIONALE AMS2243K revises diametral and wall thickness tolerances (Tables 1, 2 and 3) by including provisions for both standard and special tolerances (2.1, 2.2, 3.1). 1. SCOPE This specification covers manufact
6、uring tolerances applicable to seamless and welded tubing of corrosion and heat-resistant steel ordered to inch dimensions. These tolerances apply to all conditions and are based on individual measurements, unless otherwise noted. Tubing may be specified by two dimensions only (OD and wall thickness
7、 ID and wall thickness, or OD and ID). 2. DIAMETER 2.1 Tubing Other than Pressure Tubing; Welded (See 2.1.1) or Seamless (See 2.1.2) Shall be as shown in Table 1. Standard tolerances shall apply unless special tolerances are specified by the purchaser. TABLE 1 Specified OD or ID Inches Standard Tol
8、erance, Inch Including Ovality (See 2.3) Plus and Minus Special Tolerance, Inch Including Ovality (See 2.3) Plus and Minus Up to 0.5, excl 0.005 0.003 0.5 to 1.5, excl 0.005 0.003 1.5 to 3.5, excl 0.010 0.004 3.5 to 5.5, excl 0.015 0.005 5.5 and over 0.031 0.010 2.1.1 Welded Tubing Shall be bead-red
9、uced or shall be cold finished by tube-reducing, cold-drawing, machining, or grinding. 2.1.2 Seamless Tubing Shall be cold-finished by tube-reducing, cold-drawing, machining, or grinding. SAE AMS2243K Page 2 of 3 2.2 Pressure Tubing (See 6.1.5); Cold Drawn or Cold Reduced (Seamless or Welded) Shall
10、be as shown in Table 2. Standard tolerances shall apply unless special tolerances are specified by the purchaser. TABLE 2 Specified OD or ID Inches Standard OD or ID Tolerance, Inch Including Ovality (See 2.3) Plus and Minus Special OD or ID Tolerance, Inch Including Ovality (See 2.3) Plus and Minus
11、 Up to 0.5, incl 0.003 0.003 Over 0.5 to 1.0, excl 0.004 0.003 1.0 to 1.5, excl 0.005 0.003 1.5 to 2.0, excl 0.006 0.004 2.0 to 2.5, excl 0.007 0.004 2.5 to 3.5, excl 0.010 0.004 3.5 to 5.5, excl 0.015 0.005 5.5 to 8.0, excl 0.030 0.010 8.0 to 8.625, incl 0.045 0.020 2.2.1 Half Tolerances When half
12、tolerances are specified, the tolerances of Table 2 shall be plus only; the minus side of the tolerance range shall not be applicable. 2.3 Ovality, All Tubing All of the tolerances shown in Tables 1 and 2 include ovality except on light-walled tubing where the specified wall thickness is 3% or less
13、of the specified OD. On such light-walled tubing, there is an additional ovality tolerance (in addition to the tabular tolerances) equal to 0.5% of the specified OD (or ID); however, the average diameter shall be within the tabular tolerances. 3. WALL THICKNESS 3.1 Tubing Other than Pressure Tubing;
14、 Welded or Seamless Shall be as shown in Table 3. Standard tolerances shall apply unless special tolerances specified by the purchaser. TABLE 3 Specified OD or ID Inches Standard Wall Thickness Tolerance, % Plus or Minus Special Wall Thickness Tolerance, % Plus or Minus For Wall Thickness, Inch, Sho
15、wn For Wall Thickness, Inch, Shown Under 0.250 0.250 and Over Under 0.250 0.250 and Over Up to 0.5, excl 15 15 10 10 0.5 to 1.5, excl 12.5 10 10 10 1.5 to 3.5, excl 12.5 10 12.5 10 3.5 to 5.5, excl 12.5 10 12.5 10 5.5 and Over 12.5 10 12.5 10 3.2 Pressure Tubing (See 6.1.5); Seamless or Welded Shall
16、 be 10% for all specified diameters. 3.2.1 Half Tolerances When half tolerances are specified, tolerance shall be +10%, only. The minus side of the tolerance range shall not be applicable SAE AMS2243K Page 3 of 3 4. LENGTH When cut lengths are specified, the following tolerances apply to straight tu
17、bing in lengths up to 24 feet, inclusive. For each 10 feet or fraction thereof beyond 24 feet, an additional 1/8 inch tolerance is permitted up to a maximum of 1/2 inch. TABLE 4 Specified OD or ID Inches Tolerance, Inch Plus Only Up to 1.5, incl 1/8 Over 1.5 3/16 5. STRAIGHTNESS The maximum allowabl
18、e deviation from a straight edge shall be as shown in Table 5. These tolerances apply to all types of tubing to which this specification applies. TABLE 5 Specified OD or ID Inches Maximum Curvature in any 3 feet Inch Maximum Curvature in Total Length Inch Up to 5.0, incl 0.030 0.010 length in feet O
19、ver 5.0 to 8.0, incl 0.045 0.015 length in feet Over 8.0 0.060 0.020 length in feet 6. NOTES 6.1 A change bar (|) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. A
20、n (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. 6.2 Terms used in AMS are clarified in ARP1917 and as follows:
21、 6.2.1 The term “excl” (exclusive) applies only to the upper limit of a specified range. 6.2.2 The term “incl” (inclusive) applies to both upper and lower limits of a specified range. 6.2.3 The mean diameter is the average of two diameter measurements taken at right angles to each other in the same
22、cross-section of tubing. 6.2.4 Ovality is the difference between the maximum and minimum diameters of any plane at 90 degrees to the axis of the tube. 6.2.5 Pressure tubing is tubing intended primarily for the transmission of liquids or gasses (e.g., hydraulic tubing). Such tubing is usually used wi
23、thout machining. 6.3 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information. PREPARED BY AMS COMMITTEE “F”
