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 4 NAVISTAR, INC. Engineering Standard Parts NUMBER: ESP-EM-3.10
2、1-GS TITLE: Hex Flange 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 REV
3、ISION 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 is based on ISO 4161, ANSI B18.2.4.4 and con
4、tains elements of the following standards: International Organization for Standardization: ISO 68, 261, 262, 272, 898/2 and 965/2. PREFERRED PARTS POLICY: Preferred parts are so designated to reduce variety of parts and ssure maximum availability, interchangeability and cost savings. aNominal Sizes:
5、 M6, M8, M10, M12, M16, and M20 Material and Finish: Class 8 for sizes M6 and M8 Class 10 for All Others Steel Phosphate Coated (PHC) WIDTH ACROSS FLATS: The width across flats will be the distance, measured perpendicular to the axis of the nut, between two opposite wrenching flats. TOP OF NUT: The
6、top of nut will be flat with chamfered corners. The diameter of the chamfer circle will be equal to the maximum width across flats within a tolerance of minus 15 percent. THICKNESS: The nut thickness will be the overall distance, measured parallel to the axis of the nut, from the top of the nut to t
7、he plane of the bearing circle diameter, and will exclude raised identification markings, if present. HEX HEIGHT: The hex height will be the distance, measured at a corner of the hex from the junction of hex head with the flange to the top of the head. WRENCHING HEIGHT: The wrenching height, Ta, is
8、the distance, measured at a corner of the hex, from the junction of the hex head with the flange to the last plane of full formed hex, i.e., the plane perpendicular to the nut axis which is closest to the top of the head at which the width across corners is within its specified limits. CORNER FILL:
9、The rounding due to lack of fill at the six corners of the hex will be reasonably uniform. GAGING OF HEX PORTION: The nut will be gaged using two plain ring gages, A and B, to demonstrate the coincidental acceptability of hex height, wrenching height, corner fill and width across Copyright Navistar
10、International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: ESP-EM-3.101-GS TITLE: Hex Flange Nuts General Specifications CURRENT ISSUE DATE: May 2008 This document is restricted and may not be sent out
11、side Navistar, Inc. or reproduced without permission from Corporate corners. Gage A will be placed over the hex and will seat on the flange. Gage B will be placed on the top of the nut normal to the nut-axis. The two gages will not be in contact. (NOTE: The minimum inside diameter of Gage A equals t
12、he maximum width across corners; the maximum inside diameter of Gage B equals the minimum width across corners minus 0.01 mm; the maximum thickness of Gage A equals or is greater than the computed wrenching height necessary to provide sufficient driveability to develop two times the torsional streng
13、th of the properly mated externally threaded component.) FLANGE: The top surface of the flange will be conical or slightly rounded (convex). The flange periphery will be round within the specified maximum flange diameter and a tolerance of minus 5 percent. The contour of the edge at the flange perip
14、hery will be optional provided the minimum flange thickness is maintained at the minimum bearing circle diameter. GAGING OF FLANGE: The flange will be gaged using two plain ring gages, A and C, to demonstrate the coincidental acceptability of flange diameter and thickness. Gage C will be seated on a
15、 flat surface and the nut placed in it. Gage A will be placed over the hex portion. The nut will seat within Gage C and Gages A and C will not be in contact. Gaging of Hex Flange Nut Wa Ta Wb Tb Wc Tc Gage A Gage B Gage C Inside Inside Inside Diameter Thickness Diameter Diameter Thickness Nominal Nu
16、t Size Max Min Max Min Max MinThick- ness Min Max Min Max MinM6 11.56 11.55 3.10 3.09 11.04 11.03 4.0 14.40 14.30 1.19 1.03 M8 15.02 15.01 4.50 4.49 14.37 14.36 4.0 18.10 18.00 1.31 1.30 M10 17.33 17.32 5.50 5.49 16.63 16.62 5.0 22.00 21.90 1.81 1.80 M12 20.79 20.78 6.70 6.69 20.02 20.01 5.0 26.20 2
17、6.10 2.20 2.19 M14 24.26 24.25 7.80 7.79 23.34 23.33 6.0 30.10 30.00 2.55 2.54 M16 27.72 27.71 9.00 8.99 26.74 26.73 6.0 34.70 34.60 2.96 2.95 M20 34.65 34.64 11.10 11.09 32.94 32.93 6.0 43.00 42.90 3.70 3.60 BEARING SURFACE: The bearing surface will be flat to concave to a maximum of 2 degrees from
18、 the plane formed by the bearing circle diameter. The plane formed by the bearing circle diameter will be perpendicular to the thread within the runout limit specified on last page when measured at diameter Dw. Technical Standards. Suppliers are required to assume all patent liability. 2008 by Navis
19、tar, Inc. MAY 2008 Page 2 of 4 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: ESP-EM-3.101-GS TITLE: Hex Flange Nuts General Specifications CURRENT ISSUE DATE: May 2008 T
20、his 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 3 of 4 TRUE POSITION OF TAPPED HOLE: The axis of tapped hole will be
21、located at true position with respect to the axis of nut body within a tolerance zone having a diameter equivalent to 4 percent of the maximum width across flats, regardless of feature size. COUNTERSINK: The tapped hole will be countersunk on the bearing face. The countersink included reference angl
22、e will be 90 degrees to 120 degrees. The maximum countersink diameter will be the nominal thread diameter (major diameter) plus 0.75 mm for M8 and smaller nuts, and 1.08 times the nominal thread diameter for M10 and larger nuts. The minimum countersink diameter will be the nominal thread diameter. T
23、HREADS: Thread form, diameters, and associated pitches are in accordance with ISO recommendations. Threads will be made to the tolerances for the medium class of fit (6H = Internal Threads) as shown in ISO 965/2, General Purpose Metric Screw Threads. NUT IDENTIFICATION: Refer to CEMS A-31, Part II.
24、MATERIAL: Classes 8 and 10 per CEMS A-31, Part II. Class 9 is an acceptable alternate material for applications specifying Class 8 material. FINISHES: Nuts will be furnished plain, plated, or coated in accordance with the International Engineering Material Specification and class listed below: Zinc
25、Trivalent (ZN8A) CEMS G-20, Class 8A. Phosphate Coated (PHC) CEMS G-1, Class B-2. Zinc Aluminum Clear (ZACLR) TMS-4518, Type II. RESTRICTED CHEMICAL SUBSTANCES: Effective January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the CEMS B-5
26、0 specification. SURFACE DISCONTINUITIES: Surface discontinuities are shown and limits are defined in CEMS A-31, Part II, and SAE J122a. Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IH
27、S-,-,-NUMBER: ESP-EM-3.101-GS TITLE: Hex Flange 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 Dimensions in millimeters: Nominal Size M6 M8 M10 M12 M14* M16 M20 10 13 15
28、18 21 24 30 S Width Across Flats, Max Min 9.78 12.73 14.73 17.73 20.67 23.67 29.16 E Width Across Corners, Min 11.05 14.38 16.64 20.03 23.35 26.75 32.95 6 8 10 12 14 16 20 M Overall Height, Max Min 5.7 7.6 9.6 11.6 13.3 15.3 18.9 Dc Flange Diameter, Max 14.2 17.9 21.8 26.0 29.9 34.5 42.8 Dw Bearing
29、Circle Diameter, Min 12.2 15.8 19.6 23.8 27.6 31.9 39.9 C Flange Thickness, Min 1.1 1.2 1.5 1.8 2.1 2.4 3.0 R Flange Fillet Radius 0.4 0.5 0.6 0.7 0.9 1.0 1.2 Circular Runout of Bearing Circles FIM, Max 0.34 0.38 0.43 0.50 0.55 0.61 0.76 Coarse Thread Pitch, Nominal 1 1.25 1.5 1.75 2 2 2.5 5.153 6.9
30、12 8.676 10.441 12.21 14.210 17.744 Minor Diameter, Max Min 4.197 6.647 8.376 10.106 11.835 13.835 17.294 Pitch Diameter, Max (Ref) 5.5 7.348 9.206 11.063 12.913 14.913 18.6 Pitch Diameter, Min (Ref) 5.35 7.188 9.026 10.863 12.701 14.701 18.376 * Non-Preferred Size Technical Standards. Suppliers are required to assume all patent liability. 2008 by Navistar, Inc. MAY 2008 Page 4 of 4 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
