1、AEROSPACE STANDARDMA1759REV.AIssued 1986-09Revised 1996-08Reaffirmed 2006-05Center Hole, Metric1. SCOPE:This SAE Metric Aerospace Standard (MA) specifies the drawing requirements for center holes when center holes are required on the finished part.1.1 Application:Center holes make it possible to ins
2、tall a part between bench or machine centers in the process of manufacturing. With such center holes, it is possible to:a. Achieve center related runout requirementsb. Simplify manufacture and inspection of some revolution generated parts, namely those featuring multiple concentric diameters requiri
3、ng several machining operations1.2 Dimensional Standards:Dimensions and tolerances in this standard are expressed in millimeters and comply with those for Type A center holes per ISO 866 and Type B center holes per ISO 2540.2. REFERENCES:2.1 ANSI Publications:Available from ANSI, 11 West 42nd Street
4、, New York, NY 10036-8002.ISO 866ISO 2540ISO/R286RATIONALE This document has been reaffirmed to comply with the SAE 5-year Review policy. 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 rep
5、ort is entirely voluntary, and its applicability and suitability for any particular use, including 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 reaffirmed, revised, or cancelled
6、. SAE invites your written comments and suggestions. Copyright 2006 SAE International All 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 t
7、he prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org Copyright SAE International Provided by IHS under license with SAENot for Resale
8、No reproduction or networking permitted without license from IHS-,-,-SAE MA1759 Revision A- 2 -3. CENTER HOLE DESIGNATIONS:3.1 Hollow Part Centers:For hollow parts, the size of the countersink shall be determined from the size of the true hole (A) and specified either by direct dimensioning or by dr
9、awing note as follows: HOLLOW PART CENTER, MA1759.FIGURE 1 - Hollow Part Centers3.2 Tapped Hole Centers:Where centering from tapped holes could facilitate production, the hole ends should be designed as shown in Figure 2. Threads must be removed to a depth sufficient to assure that a machine or benc
10、h center does not contact on the threaded portion of the hole.The size of the countersink shall be determined from the size of the hole (A) and specified either by direct dimensioning or by drawing note as follows: TAPPED HOLE CENTER, MA1759.TABLE 1Dimensions in millimetersACSK B + 0.050.00Up to 12.
11、00 A Max + 1.5Over 12.00 to 25.00 A Max + 2.5Over 25.00 to 37.00 A Max + 3.0Over 37.00 A Max + 3.5Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE MA1759 Revision A- 3 -FIGURE 2 - Tapped Hole Cent
12、ers(1) This dimension is equal to the major thread diameter rounded off to the next larger standard drill size.(2) This dimension (length of thread relief) shall be determined by the designer, to provide clearance for machine center and allow sufficient thread engagement.3.3 Flat End Shaft:The cente
13、r hole shall be defined by drawing note or by direct dimensioning.The note shall designate:a. Center holeb. Type of center holec. Reference to this Aerospace Standard followed by the nominal diameters3.3.1 Center Hole, Type A:DRAWING CALL OUT: CENTER HOLE, MA1759-Ad/D(d and D from Table 2, nominal v
14、alues)Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE MA1759 Revision A- 4 -FIGURE 3 - Center Hole, Type ADimensions in Millimeters3.3.2 Center Hole with Protective Chamfer, Type B (Preferred Typ
15、e):DRAWING CALL OUT: CENTER HOLE, MA1759-Bd/E(d and E from Table 3, nominal values)TABLE 2 - Dimensions for Center Holes Type ADimensions in millimetersdNominal minD(Tol. Js11 *)minD(Tol. Js11 *)nomD(Tol. Js11 *)max0.50 * 0.8 1.03 1.06 1.090.63 * 0.9 1.29 1.32 1.350.80 * 1.1 1.67 1.70 1.731.00 1.3 2
16、.09 2.12 2.151.25 * 1.6 2.62 2.65 2.681.60 2.0 3.31 3.35 3.392.00 2.5 4.21 4.25 4.292.50 3.1 5.26 5.30 5.343.15 3.9 6.66 6.70 6.754.00 5.0 8.46 8.50 8.555.00 * 6.3 10.55 10.60 10.666.30 8.0 13.15 13.20 13.268.00 * 10.1 16.95 17.00 17.0610.00 12.8 21.14 21.20 21.26* Not preferred* Tolerances accordin
17、g to ISO/R286lCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE MA1759 Revision A- 5 -FIGURE 4 - Center Hole with Protective Chamfer, Type BPREPARED BY SAE COMMITTEE E-25, GENERAL STANDARDS FORAERO
18、SPACE PROPULSION SYSTEMSTABLE 3 - Dimensions for Center Holes Type BDimensions in millimetersdNominalzminE(Tol. Js11 *)minE(Tol. Js11 *)nomE(Tol. Js11 *)max1.00 1.3 3.11 3.15 3.191.25 * 1.6 3.96 4.00 4.041.60 2.0 4.96 5.00 5.042.00 2.5 6.26 6.30 6.352.50 3.1 7.96 8.00 8.053.15 3.9 9.96 10.00 10.054.
19、00 5.0 12.45 12.50 12.565.00 * 6.3 15.95 16.00 16.066.30 8.0 17.95 18.00 18.068.00 * 10.1 22.34 22.40 22.4710.00 12.8 27.94 28.00 28.07* Not preferred* Tolerances according to ISO/R286Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
