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-E-1.101
2、GS TITLE: Hex Nuts General Specifications (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 REVISION Change Notice: Z
3、inc Trivalent plus Sealer (ZN8F) finish specification changed to Zinc Trivalent (ZN8A) finish specification. Zinc Trivalent plus Sealer (ZN8F) finish specification removed. Replaced International Truck and Engine Corporation with Navistar, Inc. per corporate directive. GENERAL: This specification co
4、nforms with American National Standard B-18.2.2. Sizes from 1/4 thru 1-1/2 inch in the coarse thread series and from 1/4 thru 1 inch in the fine thread series are unified dimensionally with British and Canadian Standards with the exception that International has retained 1-14 UNS as standard. PREFER
5、RED PARTS POLICY: Preferred parts are so designated to reduce variety of parts and assure maximum availability, interchangeability and cost savings in volume buying. Threads: Coarse Sizes: 1/4, 5/16, 3/8, 7/16, 1/2, 5/8, 3/4, 1, 1-1/4 and 1-1/2 Material and Finish: Type 5 Zinc Trivalent (ZN8A) Type
6、8 Phosphate Coating (PHC) SERVICE PARTS SUBSTITUTION POLICY: In the event that engineering does not indicate a “Do not substitute“ in engineering specifications, the following substitutions may be implemented in service. This policy is the result of a proposal circulated April 20, 1981 and subsequen
7、tly approved by engineering departments worldwide. Hex Nuts. Jam. Thick and Slotted To be Replaced Service ReplacementType 5 material with Plain (PLN) Type 5 material with Zinc Trivalent (ZN8A) finish or type 8 material with phosphate coating (PHC) if type 5 (ZN8A) is not set up for service. Type 5
8、material with Phosphate Type 8 material with phosphate coating (PHC) Coating (PHC) Type 8 material with phosphate coating (PHC) Type 8 material with Plain (PLN) Finish Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking pe
9、rmitted without license from IHS-,-,-NUMBER: ESP-E-1.101-GS TITLE: Hex 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
10、 all patent liability. 2008 by Navistar, Inc. MAY 2008 Page 2 of 3 TOPS AND BEARING SURFACES OF NUTS: Nuts in sizes 5/8 inch nominal size and smaller will be double chamfered. Larger size nuts will be double chamfered or have washer faced bearing surface and chamfered top. The diameter of chamfer ci
11、rcle on double chamfered nuts and diameter of washer face will be within the limits of the maximum width across flats and 95 percent of the minimum width across flats. The tops of washer faced nuts will be flat and the diameter of chamfer circle will be equal to the maximum width across flats within
12、 a tolerance of minus 15 percent. The length of chamfer at hex corners will be from 5 to 15 percent of the basic thread diameter. The surface of chamfer may be slightly convex or rounded. Bearing surfaces will be flat and perpendicular to the axis of the threaded hole within the FIR (Full Indicator
13、Reading) limits specified for the respective nut type and strength level. WIDTH ACROSS FLATS: Maximum width across flats will not be exceeded. No transverse section through the nut between 25 and 75 percent of the actual nut thickness as measured from the bearing surface will be less than the minimu
14、m width across flats. CORNER FILL: A rounding or lack of fill at junction of hex corners with chamfer will be permissible provided the width across corners is within specified limits at and beyond a distance equal to 17.5 percent of the basic thread diameter from the chamfered faces. CONCENTRICITY O
15、F TAPPED HOLE: Axis of tapped hole will be concentric with axis of nut body within a tolerance equal to 3 percent (6 percent FIR) of the maximum width across flats. COUNTERSINK: Tapped holes will be countersunk on the bearing face or faces. The maximum countersink diameter will be the thread basic (
16、nominal) major diameter plus .030 inch for 3/8 inch nominal size nuts and smaller, and 1.08 times the basic major diameter for nuts larger than 3/8 inch. No part of the threaded portion will project beyond the bearing surface. SLOTS: Slots will be normal to nut flats. Contour of bottom of slots will
17、 be at manufacturers option. Requirements for gaging slots are given in ANSI B-18.2.2, Appendix II. THREADS: Threads will be Unified Series, Class 2B, in accordance with American National Standard B1.1. IDENTIFICATION: Type 8 hex nuts will be marked for type identification in accordance with CEMS A-
18、31, Part II. MATERIAL: Steel nuts, Types 5 or 8, per CEMS A-31, Part II. Brass (BRS) C36000 or equivalent, hard temper per CEMS C-3. Stainless Steel Type 18-8 (SST-304 as designated on part number page) per CEMS A-37. Type 18-8 is a non-magnetic general purpose stainless with excellent corrosion res
19、istance. Stainless Steel Type 410 (SST-410) is a magnetic general purpose stainless with good corrosion resistance and excellent strength properties. SST-410 will be supplied in the annealed condition; if higher strength is needed, a new drawing will be created. Both 18-8 and 410 Stainless Steel wil
20、l be passivated per specification ESP-A-1.301. Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: ESP-E-1.101-GS TITLE: Hex Nuts General Specifications CURRENT ISSUE DATE: Ma
21、y 2008 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate FINISH: As designated by part number, nuts will be furnished plain, plated or coated in accordance with CEMS and class listed below. Zinc Trivalent, Class 8A (ZN8A) on steel
22、CEMS G-20, Class 8A. Phosphate Coating (PHC) CEMS G-1, Class B-2. 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-50 specification. SURFACE DISCONTINUITIES: Surface discontinuiti
23、es will be determined by methods shown in CEMS A-31. Part II. Dimensions in inches: Nominal Hex Nuts Size C E D Specified Proof Load Or Basic Major Width Across Flats Width Across Corners Thickness Hex Nuts Up to 150,000psi 150,000 psi and Greater Diameter of Thread Basic Max Min Max Min Basic Max M
24、in Runout of Bearing Face, FIR max 1/4 7/16 .438 .428 .505 .488 7/32 .226 .212 .015 .010 5/16 1/2 .500 .489 .577 .557 17/64 .273 .258 .016 .011 3/8 9/16 .562 .551 .650 .628 21/64 .337 .320 .017 .012 7/16 11/16 .688 .675 .794 .768 3/8 .385 .365 .018 .013 1/2 3/4 .750 .736 .866 .840 7/16 .448 .427 .01
25、9 .014 * 9/16 7/8 .875 .861 1.010 .982 31/64 .496 .473 .020 .015 5/8 15/16 .938 .922 1.083 1.051 35/64 .559 .535 .021 .016 3/4 1- 1/8 1.125 1.088 1.299 1.240 41/64 .665 .617 .023 .018 * 7/8 1- 5/16 1.312 1.269 1.516 1.447 3/4 .776 .726 .025 .020 1 1- 1/2 1.500 1.450 1.732 1.653 55/64 .887 .831 .027
26、022 * 1-1/8 1- 11/16 1.688 1.631 1.949 1.859 31/32 .999 .939 .030 .025 1-1/4 1- 7/8 1.875 1.812 2.165 2.066 1- 1/16 1.094 1.030 .033 .028 * 1-3/8 2- 1/16 2.062 1.994 2.382 2.273 1- 11/64 1.206 1.138 .036 .031 1-1/2 2- 1/4 2.250 2.175 2.598 2.480 1- 9/32 1.317 1.245 .039 .034 * NON-PREFERRED * Not P
27、referred for New Design Technical Standards. Suppliers are required to assume all patent liability. 2008 by Navistar, Inc. MAY 2008 Page 3 of 3 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
