NAVISTAR MPAPS S-EM-70 101-GS PL-2015 Multi-Thread Wide Range U Nuts 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 8 NAVISTAR, INC. Material, Parts, and Process Specifications (
2、MPAPS) NUMBER: MPAPS S-EM-70.101-GS/PL Former Designation: ESP-EM-70.101-GS TITLE: Multi-Thread Wide Range “U” Nuts Metric Series (Noun Code 5780) CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-EM-70.101-GS - Septembe
3、r 2000 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 appropriate
4、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 ma
5、y also be supplemental group instructions in regard to use of metric standards that should be taken into account. The metric wide range U-shape multi-thread spring nuts covered in this standard are intended for applications where it is desired to use spring nuts in conjunction with bolts, machine sc
6、rews or screw and washer assemblies. Nuts conforming to this standard are suitable for use with mating fasteners conforming to 9.8 or lower property classes. 2.0 RESTRICTED CHEMICAL SUBSTANCES: Effective January 1, 2007, all product supplied to the requirements of this specification must comply with
7、 the requirements of the MPAPS B-50 specification. 3.0 CONTENTS: Page General 1 Restricted Chemical Substances 1 Design Consideration 2 Metric-Inch Related Sizes 2 Threads 2 Thread Tolerances 3 Property Class 3 Color Coding 3 Method of Designation 3 Policy for Selecting Parts for New Design 3 Identi
8、fication 3 Contours 3 Extruded Barrel 3 Retaining Extrusion 3 NUMBER: MPAPS S-EM-70.101-GS/PL TITLE: Multi-Thread Wide Range “U” Nuts REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers a
9、re required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 2 of 8 4.0 DESIGN CONSIDERATION: In general, U shape nuts are preferred to J shape nuts for standardization purposes due to their superior retention capabilities and the complete support they provide around the hole in
10、 the panel. Nuts conforming to this standard are suitable for use with mating metric fasteners having class 9.8 or lower strength levels. The proof strengths of these nuts are equivalent to the tensile strengths of class 9.8 male fasteners; however, proof strengths are somewhat lower than class 9 he
11、x nuts. The maximum installation torques must be adjusted accordingly. Multi-Thread Wide Range “U“ Nuts are available in short and long throat styles, to cover variations in throat depth requirements. Nut styles will be selected to best suit the edge distances and panel thicknesses of the applicatio
12、n. To assure proper function and performance of spring nuts, to provide flexibility for changing nut designs and to achieve simplification, it is essential that the panel hole sizes, edge to center distances and any embossing or punching features necessary be kept in conformance with the assembly co
13、nsiderations in section 20.0. 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 recommendation for substitutions but only as a means of determining approxima
14、te dimensional equivalents. Metric Series mm Approximate Inch Series 4 #6, #8 5 #10 6 1/4 8 5/16 10 3/8, 7/16 6.0 THREADS: The ISO basic profile is essentially the same geometric configuration as the unified screw thread basic form. The threads will be coarse series, tolerance class 6H. Threads in t
15、he extruded barrel will be produced only by the roll forming process and will conform to ISO Class 6H internal metric screw threads. However, the minor diameter may exceed the specified maximum limit providing the nut will meet the proof strength requirements. Page Material 4 Finishes 4 Relief of Em
16、brittlement 4 Performance Requirements 4 Assembly Considerations 5 Workmanship 6 Dimensions 7 Part List 8 Technical Information 8 NUMBER: MPAPS S-EM-70.101-GS/PL TITLE: Multi-Thread Wide Range “U” Nuts REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduce
17、d without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 3 of 8 7.0 THREAD TOLERANCES: The medium ISO class of fit 6H(Int)/6g(Ext) is approximately the same as the 2A(Ext)/2B(Int) allowance in the U.S. unifi
18、ed thread series for comparable size. For example: Thread Allowance M10 x 1.5 - 6H(Int)/6g(Ext) 0.032 mm (.00126 in) 3/8-16 UNC 2A(Ext)/2B(Int) .0013 in (0.033 mm) 8.0 PROPERTY CLASS: The property class designation for steel nuts is equal to one-hundredth of the approximate proof load stress in mega
19、pascals (1 MPa = 1 N/mm2). 9.0 COLOR CODING: Not recommended, except in cases where adequate insurance is needed to prevent mixing of “metric parts“ with look-alike “inch parts.“ The color blue is standard identifier used in some industries. This must be handled internally at individual plants where
20、 needed and is meant to be supplemental to the normal finish and easily deleted when the need for supplemental identification no longer exists. The supplemental blue color should not be used on finishes such as chromium bright which are specified for cosmetic purposes or phosphate coating which may
21、cause a loss of color identity. 10.0 METHOD OF DESIGNATION: Nuts will be designated by size, word description, throat, finish, material, and part number as follows: M10, Multi-Thread Wide Range “U“ Nut, Short, PHC, HTS, Part Number The absence of a specification for pitch indicates the coarse thread
22、 is required; e.g., a coarse thread of the dimensions M10 x 1.5 is designated as “M10.“ 11.0 POLICY FOR SELECTING PARTS FOR NEW DESIGN: Approved parts are so designated to reduce variety of parts and assure maximum availability, interchangeability and cost savings. For new design, parts shall be sel
23、ected from “Approved“ part list only. Nominal sizes: All sizes listed Throat style: Short Finish: Phosphate coated (PHC) 12.0 IDENTIFICATION: Spring nuts will be permanently and legibly marked with manufacturers identification on the upper surface of the top leg adjacent to the fold. The marking wil
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