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 theref
2、rom, 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 2008 SAE International All rights reserved. No part of this publication ma
3、y 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: 724-776-4970 (outside USA)
4、Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AS1132HAS1132H AEROSPACESTANDARDIssued 1970-02 Reaffirmed 2004-02 Revised 2008-10 Superseding AS11
5、32G Bolts, Screws and Nuts - External Wrenching UNJ Thread, Inch - Design Standard RATIONALEUpdate standard by aligning datum call-outs for geometric and positional requirements with ASME Y14.5M-1994, clarifying lightening hole depth for double hexagonal bolts and adding positional tolerances for va
6、riuos features to complete requirements. 1. SCOPE The scope of this standard is to define the following dimensional requirements for double hexagon, hexagon head and tee headed bolts, and nuts having a minimum tensile strength ranging up to 220 ksi, unless otherwise specified. a. Head dimensions (se
7、e 3.1) b. Shank dimensions (see 3.2) c. Geometric control (see 3.3) d. Surface texture (see 3.4) e. Dimensions for nuts (see Section 4) For design calculations the AS8879 coarse threads, UNJC, shall be used for 0.1640 thread sizes and smaller, and for larger thread sizes use fine threads, UNJF. For
8、particulars of thread runout and lead threads for bolts, see AS3062. NOTE: The ability of a design to achieve a given strength class will ultimately depend on the selected material and the associated processing. 1.1 Purpose To establish design requirements for bolts, screws and nuts in the UNJ threa
9、d inch series primarily for use in propulsion systems. As defined by the Federal Cataloging System, thread sizes less than 0.1900 are referred to as screws and larger sizes are referred to as bolts. For the purpose of this document, the term bolt will be used for all sizes. Copyright SAE Internation
10、al Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS1132H - 2 -1.2 Dimensions 1.2.1 Dimensional Units Dimensions and tolerances in this document are in inches, unless otherwise specified. 1.2.2 Coatings Dimensions specifie
11、d in this document apply after finish when bolts or nuts are plated and before finish when bolts or nuts are dry film lubricated. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall
12、apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order, unless a specific issue date or revision level is indicated in this paragraph. In the event of conflict between the text of thisdocument and references cited herein, the text of this doc
13、ument takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) o
14、r 724-776-4970 (outside USA), www.sae.org.AS870 Wrenching Configuration, Bi-Hexagonal (12 Point) Drive, Design Standard For AS3062 Bolts, Screws and Studs, Screw Thread Requirements AS3063 Bolts, Screws, and Studs, Geometric Control Requirements AS5443 Wrenching Element, Spline Drive - Dimensions fo
15、r AS8879 Screw Threads - UNJ Profile, Inch, Controlled Radius Root with Increased Minor Diameter 2.1.2 ASME Publications Available from American Society of Mechanical Engineers, 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900, Tel: 973-882-1170, www.asme.org.ASME B46.1 Surface Texture (Surface
16、 Roughness, Waviness, Lay) ASME Y14.5M-1994 Dimensioning and Tolerancing ANSI Y14.36M Surface Texture Symbols 3. GENERAL REQUIREMENTS 3.1 Head Dimensions 3.1.1 Double hexagon headed bolts up to a strength level of 220 ksi min fasteners shall have head configuration in accordance with Figure 1A and T
17、able 1A. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS1132H - 3 -3.1.1.1 Where heads are required to be drilled for lockwire or safety wire, the particulars in Figure 1B and Table 1B shall a
18、pply. 3.1.2 Double hexagon headed bolts for 260 ksi min fasteners shall have head configuration in accordance with Figure 2A and Table 2A. 3.1.2.1 Where heads are required to be drilled for lockwire or safety wire, the particulars in Figure 2B and Table 2B shall apply. 3.1.3 Hexagon headed bolts sha
19、ll have a head configuration in accordance with Figure 3A and Table 3A. 3.1.3.1 Where heads are required to be drilled for lockwire or safety wire, the particulars in Figure 3B and Table 3B (1 hole) and Figure 3C and Table 3C (6 holes) shall apply. 3.1.3.2 In the case of hexagon heads, it is necessa
20、ry to increase the head height to accommodate the holes. 3.1.4 Formulae used for calculating hexagon across flats and the across corner dimensions are as follows: 3.1.4.1 Minimum Width Across Flats AF min = AF nom 0.010 (AF nom)0.25 (Eq. 1) where:AF nom = nominal width across hexagon flats 3.1.4.2 M
21、aximum Width Across Flats AF max AF nom 0.001=+ (Eq. 2) where:AF nom = nominal width across hexagon flats less than 0.500 AF max AF nom 0.002=+ (Eq. 3) where:AF nom = nominal width across hexagon flats equal to or greater than 0.500 3.1.4.3 Minimum Distance Across Corners E min 1.141(AF min) 0.009=
22、(Eq. 4) where:AF min = minimum width across hexagon flats 3.1.5 Tee head bolts shall have a head configuration in accordance with Figure 4 and Table 4A. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-
23、,-SAE AS1132H - 4 -3.2 Shank Dimensions 3.2.1 Coarse Tolerance Shank Bolts These are bolts having a tolerance on the shank diameter greater than 0.001 and include full shank and pitch diameter shank bolts. 3.2.1.1 Length of bolt from under head (Dimension L, Figures 4B, Figures 5A and 5B) shall be i
24、n steps of 0.0625 up to 2.000 and in steps of 0.125 above 2.000 rounded to three decimal places. 3.2.1.2 Length of Threads, Bolts Not Threaded to Head Thread Length, L nom M max 2D 0.250 =+ (Eq. 5) where:L nom = nominal overall shank length M max = maximum length from under head to full thread D = n
25、ominal thread diameter 3.2.1.3 Minimum Length of Plain Shank (N min) and Maximum Length from Under Head to First Full Thread (M max), see Figures 5A and 5B and Table 5 These dimensions fall into two categories with a transitional stage depending on under head overall length (L nom) as described in 3
26、.2.1.3.1 and 3.2.1.3.2. 3.2.1.3.1 Bolts Not Threaded to Head Length to full thread, M max L nom (2D 0.250)= + (Eq. 6) where:M max = under head length to full thread, rounded to three decimal places L nom = nominal overall shank length D = nominal thread diameter Length of plain shank (except for tra
27、nsitional sizes, see 3.2.1.3.2 and Table 5): N min M max 2P 0.060= (Eq. 7) where:N min = length of plain shank, rounded to three decimal places 0.060 = tolerance factor P = pitch of thread Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking p
28、ermitted without license from IHS-,-,-SAE AS1132H - 5 -3.2.1.3.2 Where bolts with a simple under head radius, e.g., as in Figure 1A, are threaded to head, the following formulae will apply: Nmin Rmax= (Eq. 8) Where the bolt has a compound radius, e.g., as in Figure 4, under the head, the following f
29、ormulae will apply: 2221 2 1N min (R max R max) (R max A max) R max= + (Eq. 9) Mmax Nmin 2P=+ (Eq. 10) where:N min = minimum length of plain shank M max = maximum length to full thread rounded to three decimal places R max = maximum under head radius P = pitch of thread See Figure 4 for R1max, R2max
30、, and A max. Example for thread size 0.1900 - 32, is as foIlows: N min = R max = 0.025 M max = N min + 2P = 0.025 + 0.0625 = 0.0875; rounded to 0.088 The transition stage for bolts threaded to head occurs when N min obtained from Equation 7 provides a value less than the under head maximum radius (R
31、 max) which is not acceptable. At this transition stage, the following formulae apply: N min = R max, for threaded to head bolts (Eq. 8), andM max = L nom - (2D + 0.250), for bolts not threaded to head (Eq. 6). The shortest threaded to head bolt length is determined by the following: The shortest to
32、 head shank length L nom = N min + 3.5P + 0.8D + 0.062 (Eq. 11) where:N min = R max, maximum under head radius 3.5P = thread pitch allowance for lead (1.5P) and runout threads (2P) 0.8D = nominal nut thickness 0.062 = factor for bolt length increment Copyright SAE International Provided by IHS under
33、 license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS1132H - 6 -Results to be rounded up to the nearest 0.0625 for lengths less than 2.000; for lengths 2.000 and greater round up to the nearest 0.1250. The nominal under head shank lengths (L nom)
34、for the shortest and longest threaded to head bolts are listed in Table 4B and Table 5. 3.2.1.4 Diameter of Shank 3.2.1.4.1 Coarse Tolerance Full Shank Bolts Coarse tolerance full shank bolts (see Figure 6A) shall have a shank 0.001 less than the nominal bolt diameter rounded to 3 decimal places. Th
35、e tolerance shall be in accordance with Table 6. 3.2.1.4.2 Pitch Diameter Shank Bolts Pitch diameter shank bolts (see Figure 6B) shall have a shank diameter equal to the maximum (basic) pitch diameter with a plus and minus tolerance of 0.005, see Table 6. 3.2.1.4.3 Threaded to Head Bolts All bolts w
36、here plain shank N min = R max (this includes transitional sizes, see 3.2.1.3.2) shall be designed with pitch diameter shanks. 3.2.2 Close Tolerance Full Shank Bolts These are bolts with a shank diameter tolerance of 0.001 or less. 3.2.2.1 Nominal length of bolt from under head is determined by M ma
37、x + thread length. Tolerance applied shall be 0.010.3.2.2.2 Grip Length (N) Shall be computed as follows, see Figure 7. Results shall be rounded up to the nearest 0.0625: N min = R max + 0.3D (Eq. 12) where:N min = minimum grip length R max = maximum under head fillet radius D = nominal thread size
38、0.3 = minimum body length factor Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS1132H - 7 -3.2.2.3 Start of First Full Thread (M) See Figure 7. Shall be computed as follows: M max = N min + 2P
39、 + 0.010 (Eq. 13) where:M max = under head maximum length to full thread N min = minimum grip length P = pitch of thread 0.010 = allowance for length tolerance 3.2.2.4 Length of Thread Length of thread shall be computed as follows, see Figure 7. Thread Length = 0.062 + maximum nut height - sum of in
40、ternal chamfers in nut + 3P (Eq. 14) where:0.062 = bolt length increment 3P = 1.5P for lead threads + 1 .5P for tolerances on clamped parts and bolt overall length P = pitch of thread NOTE 1: For the maximum nut height for strength classes less than 260 ksi use values in Figure 10 and 14. For streng
41、th class 260 ksi use a factor of 1.4D (D = Nominal thread diameter). NOTE 2: The term “sum of internal chamfers in nut” is included only when the nominal chamfer diameter is greater than the basic major diameter of the nut thread. NOTE 3: The 1.5P lead threads take into account the fact that the thr
42、ead pitch diameter will conform with the thread specification at a distance 1.5P from the end of the bolt and therefore will be the start of the full thread. 3.2.2.5 Diameter of Shank Close tolerance full shank bolts shall have a shank diameter 0.0005 in less than the nominal bolt diameter with a to
43、lerance of minus 0.001. 3.2.2.6 The maximum thread major diameter shall be modified and be equal to the minimum shank diameter less 0.001.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS1132H -
44、 8 -3.2.3 Thread Chamfer The thread chamfer at the lead threads is controlled by a diameter (AB) and a 45 degree chamfer, see Figure 6A and Table 6. The requirement is applicable to coarse tolerance full shank bolts, PD shank bolts and close tolerance shank bolts. The values (rounded to three decima
45、l places), see Table 6, are based on the following: AB max = Minimum thread minor diameter (D) (Eq. 15) AB min = AB max - 0.020 (Eq. 16) 3.2.3.1 The permissible offset (AK) of the chamfer relative to the minimum thread major diameter (D) is based on: AK min = (D AB max ) 0.5 0.005 (Eq. 17) 3.3 Geome
46、tric and Positional Controls ASME Y14.5M and AS3063. For definition of the terms coarse tolerance and close tolerance shank bolts as used in Tables 8 and 9, see 3.2.1 and 3.2.2. 3.3.1 Straightness of the axis of the threads shall be in accordance with the tolerance specified in Table 8 and the requi
47、rements of AS3063. 3.3.2 Circular runout of the plain shank surface to the thread pitch cylinder shall be in accordance with the tolerance specified in Table 9 and the requirements of AS3063. Circular runout of the double hexagon head flange outer surface, crest of double hexagon, and the crest of t
48、he hexagon wrenching surfaces relative to the plain shank surfaces for a length not less than 1.5 times the nominal bolt diameter from the bearing surface shall be in accordance with the tolerance in Table 10 and the requirements of AS3063. For bolts having a plain shank less than 1.5 times the nominal bolt diameter, the thread pitch cylinder shall replace the plain shank surface (Datum “Y” in Figure 8) and the tolerance in Table 10 are relative to the thread pitch cylinder (Datum “Z” in Figure 8) instead of the
