NAVISTAR MPAPS S-EM-56 101-GS PL-2015 Prevailing Torque Hex Nuts C All Metal C Metric Series (Noun Code 5780).pdf
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1、This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 1 of 11 NAVISTAR, INC. Material, Parts, and Process Specifications
2、(MPAPS) NUMBER: MPAPS S-EM-56.101-GS/PL Former Designation: ESP-EM-56.101-GS TITLE: Prevailing Torque Hex Nuts All Metal Metric Series (Noun Code 5780) CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-EM-56.101-GS - Aug
3、ust 2012 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION This specification may involve hazardous materials, equipment, and procedures. This specification does not purport to address all of the safety issues associated with its use. The user is responsible to consult appropriat
4、e safety and health practices and to determine the applicability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format; Combined GS, GI, PP. 1.0 GENERAL: Implementation of this standard must be in accordance with the policies and procedures outlined in MPAPS S-A-0.101. There
5、may also be supplemental group instructions in regard to use of metric standards that should be taken into account. This standard may differ in some respects with certain segments of ISO and national standards. In recognition of these possible differences, the sizes and tolerance ranges used were es
6、tablished in an effort to enable the use of commercially available items, dimensionally interchangeable worldwide. This specification contains elements of the following standards: American National Standards Institute: 18.16.3M International Organization for Standardization: ISO 2320, 7042, 7719 Pre
7、vailing torque type is a nut which is frictionally resistant to rotation due to a self-contained prevailing torque feature, and not because of a compressive load developed against the bearing surface of the nut. Prevailing torque is the torque necessary to rotate the nut on its mating externally thr
8、eaded component, with the torque being measured while the nut is in motion, and with no axial load in the mating component. Inch series prevailing torque hex nuts - all metal, may be found in MPAPS S-E-56.101-GS/PL. Letter symbols designating dimensional characteristics are in accord with those used
9、 in ANSI and ISO standards. 2.0 APPLICATION GUIDE: To ensure full benefit of the prevailing torque feature, two fully formed threads must be visible beyond the top surface of the nut. NUMBER: MPAPS S-EM-56.101-GS/PL TITLE: Prevailing Torque Hex Nuts All Metal REVISION: 1506 This document is restrict
10、ed and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 2 of 11 3.0 CONTENTS: 4.0 DESIGN CONSIDERATION: The use of thru hardened washers is recommen
11、ded in high strength bolted connections and in Class 8.8 applications involving oversized or slotted holes. Optimum uses for prevailing torque nuts are with short length bolts, joints where the pre-load may be less than the service load, soft materials, and joints subjected to severe vibration. Coar
12、se thread series only will be considered as part of this standard, because of the following advantages: Less tendency to cross thread. Less likely to be seriously affected by manufacturing errors such as decarburization and oversized minor diameter of internal threads. In the event of a failure of m
13、atched class bolt/nut combination, the tendency will be toward bolt fracture rather than undetectable strip. Page General 1 Application Guide 1 Design Consideration 2 Metric-Inch Related Sizes 3 Threads 3 Thread Tolerances 3 Performance Requirements 3 Property Class 3 Mechanical Properties 3 Color C
14、oding 4 Method of Designation 4 Policy for Selecting Parts for New Design 4 Width Across Flats 4 Thickness 4 Wrenching Height 4 Bearing Surface 4 True Position of Tapped Hole 4 Countersink 5 Threads 5 Material 5 Finishes 5 Restricted Chemical Substances 5 Workmanship 5 Performance Requirements 5 Tes
15、t Methods 6 Dimension of Hex Nuts 10 Part List 11 Technical Information 11 NUMBER: MPAPS S-EM-56.101-GS/PL TITLE: Prevailing Torque Hex Nuts All Metal REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Stand
16、ards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 3 of 11 5.0 METRIC INCH RELATED SIZES: During the inch to metric design transition period, the following chart of related sizes can be used for reference. This information is not to be considered as a
17、recommendation for substitutions but only as a means of determining approximate dimensional equivalents. Metric Series Approximate Metric Series Approximate mm Inch Series mm Inch Series 6 1/4 16 5/8 8 5/16 20 3/4 10 3/8, 7/16 24 7/8, 1 12 1/2 30 1-1/8, 1-1/4 14 9/16 36 1-1/2 6.0 THREADS: The ISO ba
18、sic profile is essentially the same geometric configuration as the unified screw thread basic form. The threads will be coarse series, tolerance class 6H. 7.0 THREAD TOLERANCES: The medium ISO class of fit 6H/6g is approximately the same as the 2A/2B allowance in the U.S. unified thread series for c
19、omparable size. For example: Thread Allowance M10 x 1.5 - 6H/6g 0.032 mm (.00126 in) 3/8-16 UNC 2A/2B .0013 in (0.033 mm) 8.0 PERFORMANCE REQUIREMENTS: Proof, clamp loads, and prevailing torques are listed in section 25.0. Nuts will not be used for special applications such as those requiring weldab
20、ility, corrosion resistance, or ability to withstand temperatures above 230C or below minus 50C for plated nuts and above 300C to below minus 50C for unplated nuts. 9.0 PROPERTY CLASS: The property class designation for steel nuts is equal to one hundredth of the approximate proof load stress in meg
21、apascals (1 MPa = N/mm2). 10.0 MECHANICAL PROPERTIES: The property class designation system for prevailing torque steel nuts will be a number which is one-hundredth to the approximate proof load stress in megapascals (MPa). The proof load stress corresponds to the minimum tensile strength of the hig
22、hest class of bolt or screw with which the nut can be used. Property Class Designation for Prevailing Torque Nuts Property class designation 10 Proof load stress, MPa 1040 It is recommended that the class of nut be used with each class of bolt as indicated in the following: Recommended Bolt and Nut
23、Combination Class of Bolt All Class of Nut 10 Caution! If it is necessary to combine a class 10 nut with a bolt of a lower class than 10.9, the prevailing torque characteristics will be significantly altered. NUMBER: MPAPS S-EM-56.101-GS/PL TITLE: Prevailing Torque Hex Nuts All Metal REVISION: 1506
24、This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 4 of 11 11.0 COLOR CODING: Not recommended, except in cases where a
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