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. 2008 by Navistar, Inc. MAY 2008 Page 1 of 2 NAVISTAR, INC. Engineering Standard Parts NUMBER: ESP-EM-6.00
2、1-GI TITLE: Hex Slotted Nuts General Information Metric Series CURRENT ISSUE DATE: May 2008 WRITTEN/REVIEWED BY: Corporate Technical Standards APPROVED BY: Corporate Technical StandardsSUPERSEDES ISSUE OF: August 2006PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION Change Notice
3、: Zinc Trivalent plus Sealer (ZN8F) finish specification changed to Zinc Trivalent (ZN8A) finish specification. Replaced International Truck and Engine Corporation with Navistar, Inc. per corporate directive. GENERAL: Implementation of this standard must be in accordance with the policies and proced
4、ures outlined in ESP-A-0.101. There 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 national standards. In recognition of these differences, the sizes and tolerance
5、ranges used were established in an effort to enable the use of commercially available items, dimensionally interchangeable worldwide. DESIGN CONSIDERATION: Hex slotted nuts are not intended for general use. This nut is designed for insertion of a split (cotter) pin to secure the nut in place when us
6、ed with a drilled threaded rod or fastener. Coarse 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 oversize minor diameter of i
7、nternal threads. In the event of failure of matched class bolt/nut combination, the stronger thread will increase tendency toward bolt fracture rather than undetectable nut strip. METRIC-INCH RELATED SIZES: During the inch to metric design transition period, the following chart of related sizes can
8、be used for reference. This information is not to be considered as a recommendation for substitutions but only as a means of determining approximate equivalents. Metric Series mm Approximate Inch Series Metric Series mm Approximate Inch Series 6 1/4 20 3/4 8 5/16 22 7/8 10 3/8, 7/16 24 1 12 1/2 27 1
9、4 9/16 30 1-1/8, 1-1/4 16 5/8 36 1-1/2 18 9/16 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: ESP-EM-6.001-GI TITLE: Hex Slotted Nuts General Information CURRENT ISSUE DA
10、TE: May 2008 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. 2008 by Navistar, Inc. MAY 2008 Page 2 of 2 THREADS: The ISO basic profile is essentially th
11、e same geometric configuration as the unified screw thread basic form. The threads will be coarse series, tolerance class 6H. 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 comparable size. For example: Thre
12、ad AllowanceM10 x 1.5 - 6H/6g 0.032 mm (.00126 in) 3/8-16 UNC 2A/2B .0013 in (0.033 mm) MATERIAL: Proof and tensile strength values are listed in ESP-EM-6.201-GS. Nuts will not be used for special applications such as those requiring weldability, corrosion resistance, or ability to withstand tempera
13、tures above 300 C or below minus 50 C. PROPERTY CLASS: The property class designation for steel nuts is equal to one-hundredth of the approximate proof load stress in megapascals (1 MPa = 1 N/mm2). COLOR CODING: Not recommended, except in cases where adequate insurance is needed to prevent mixing of
14、 “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 needed and is meant to be supplemental to the normal finish and easily deleted when the need for supplemental identification no long
15、er exists. The supplemental blue color should not be used on materials such as stainless steel when used for cosmetic purposes, or phosphate coating which causes a loss of color identity. METHOD OF DESIGNATION: Hex slotted nuts will be designated on purchase orders by size, word description, materia
16、l class, finish, and part number as follows: M10, Hex Slotted Nut, Class 8, ZN8A, Part Number The absence of a specification for pitch indicates that coarse thread is required; e.g., a coarse thread of the dimensions M10 x 1.5 is designated as “M10“. Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
