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 3 NAVISTAR, INC. Engineering Standard Parts NUMBER: ESP-EM-6.20
2、1-GS TITLE: Hex Slotted Nuts General Specifications Metric Series (Noun Code 5780) 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 RE
3、VISION Change Notice: 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: This specification contains the essentials of the following st
4、andards: International Organization for Standardization: ISO 68, R262, R272, R288, R898/II, R898/III, DR952, and 965/II Association of French Standards: NF E27-414 German Institute of Standardization: DIN 935 Inch series slotted nuts may be found in ESP-E-6.201-NPP. SQUARENESS (ANGULARITY): The axis
5、 of the thread of the nut will be square to the face of the nut subject to the squareness tolerance given in the table on the last page. ECCENTRICITY: The eccentricity of the hexagon flats of nuts relative to the thread diameter will not exceed the values given in the dimensional table in the table
6、on the last page. CQRNER CHAMFER: Nuts without a washer face will have a chamfer of 30 degrees on both faces. The bearing surface will also be countersunk at an included angle of 120 degrees of the thread. The diameter of the countersink will not exceed the nominal major diameter of the thread plus
7、0.13 mm up to and including 12 mm diameter, and plus 0.25 mm above 12 mm diameter. SLOT BASE: The base of slot will be round, radiused or chamfered at manufacturers option. BEARING SURFACE: The bearing surface will be flat, free from tool marks and burrs. The diameter of the bearing surface or washe
8、r face will be 95 percent of the width across flats within a tolerance of plus or minus 5 percent. The values for total runout are as shown: Dimensions in millimeters: Nominal Sizes 6 8 10 12 14 16 18 20 22 24 27 30 36 Total Runout 0.33 0.36 0.39 0.42 0.44 0.48 0.52 0.56 0.6 0.64 0.71 0.76 0.89 THRE
9、ADS: Thread form, diameters and associated pitches are in accordance with ISO recommendations. Thread will be made to the tolerances for the medium class of fit (6H - internal threads) as shown in ISO 965/II, General Purpose Metric Screw Threads. Type B nuts may be supplied with or without threads i
10、n the slotted thickness. Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: ESP-EM-6.201-GS TITLE: Hex Slotted Nuts General Specifications CURRENT ISSUE DATE: May 2008 This d
11、ocument is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate MARKING: Nuts may carry some form of manufacturers identification. The property class will be approximately marked by either of the following methods: 1. The property class symbol indente
12、d into the bearing face of the nut. 2. The property class indicated by means of a clock face system which will be marked preferably on the external chamfers of the nut by indenting or embossing. Embossed marks will in no case protrude beyond the bearing face of the nut. The clock face system may alt
13、ernatively be indented in the bearing face of the nut. MATERIAL: Steel, Class 8 and Class 10, per CEMS A-31, Part II. Nuts may be produced by cold forging, hot forming, or by turning from bar. MECHANICAL PROPERTIES: The property class designation system for steel nuts will be a number which is one-h
14、undredth of the approximate proof load stress in megapascals (MPa). The proof load stress corresponds to the minimum tensile strength of the highest class of bolt or screw with which the nut can be used. Property Class Designation for Nuts Property Class Designation 8 10 Proof Load Stress, MPa 840 1
15、040 Nuts will meet the proof load requirements for property class 8.8 bolts as shown in ESP-BM-1.001-GI. It is recommended that the class of nut be used with each class of threaded rod or bolt as indicated in the following: Recommended Threaded Rod or Bolt and Nut Combination Class of Bolt 4.6 5.8 8
16、8 10.9 Class of Nut 8 10 Technical Standards. Suppliers are required to assume all patent liability. 2008 by Navistar, Inc. MAY 2008 Page 2 of 3 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without licens
17、e from IHS-,-,-NUMBER: ESP-EM-6.201-GS TITLE: Hex Slotted Nuts General Specifications CURRENT ISSUE DATE: 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 l
18、iability. 2008 by Navistar, Inc. MAY 2008 Page 3 of 3 FINISHES: In accordance with the International Engineering Material Specification and class listed below: Plain (PLN) Free from dirt and rust and coated with a light oil film. Zinc Trivalent (ZN8A) CEMS G-20, Class 8A. RESTRICTED CHEMICAL SUBSTAN
19、CES: Effective January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the CEMS B-50 specification. WORKMANSHIP: Nuts must be free from burrs, slivers, seams, and other defects which might affect their serviceability. Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
