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 2 NAVISTAR, INC. Material, Parts, and Process Specifications (
2、MPAPS) NUMBER: MPAPS S-N-21.101-GS/PL Former Designation: ESP-N-21.101-GS TITLE: Metal Balls (Noun Code 0460) English Series CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-N-21.101-GS - August 2006 PRINTED COPIES OF T
3、HIS 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 safety and health practice
4、s and to determine the applicability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format; Combined GS, PP. 1.0 GENERAL: This standard establishes the requirements for finished metal balls for rolling contact (ball) bearings and other uses as described in ANSI/AFBMA 10. 2.0
5、RESTRICTED CHEMICAL SUBSTANCES: Effective January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the MPAPS B-50 specification. 3.0 DIMENSIONS: All dimensions in this standard are in inches. Metric dimensioned metal balls may be found on M
6、PAPS S-NM-21.101-GS/PL. 4.0 NOMINAL DIAMETER: The diameter value that is used for the purpose of general identification of a ball, e.g. 1/4“ (D). 5.0 BALL GRADES AND TOLERANCES: MASTER TABLE OF BALL GRADES AND TOLERANCES (IN INCH) NavistarGrade Diameter Tolerance Per Ball “V“ Block Out-of-Round in 1
7、20 Angle Diameter Tolerance Per Unit Container Basic Diameter Tolerance Plus or Minus Marking Increments Maximum Surface Roughness Microinch AA * 24 .000024 .000024 .000048 .0001 .00001 2 100 .0001 .0001 .0002 .0005 .0001 5.0 200 .0002 .0002 .0004 .0010 .0002 8.0 1000 .001 .001 .002 .005 - Not Appli
8、cable * Formerly Grade 25 NUMBER: MPAPS S-N-21.101-GS/PL TITLE: Metal Balls REVISION: 1506 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 Navist
9、ar, Inc. JUNE 2015 Page 2 of 2 6.0 MATERIALS: Balls will be manufactured from materials defined in CEMS A-34. When the numeric grade designation is specified without a prefix, chrome alloyed steel is required. SST or BRS prefix designations are used with the numeric code when stainless steel or bras
10、s, respectively, is required. 7.0 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 in volume buying. For new design, parts shall be selected from “Approved“ part list only. NAVI
11、STAR GRADE 24 8.0 SURFACE ROUGHNESS: Relatively fine-spaced surface irregularities, where height, width and direction establish the predominant surface pattern. 9.0 PART LIST: 9.1 Approved: Nominal Diameter Grade Part Number 1/4 200 7911T 1/4 SST100 28546R1 11/32 100 3072917R1 1/2 200 D 2616 1/2 100
12、0 13722D 5/8 24 17020R1 10.0 TECHNICAL INFORMATION: For further information related to the technical content of this specification, contact: Suppliers may purchase controlled copies of this specification by contacting: Materials Engineering and Technology Dept. 10400 W. North Avenue Melrose Park, IL 60160 E-mail: MaterialsEngineeringN IHS Global Inc. 15 Inverness Way East Englewood CO 80112-5776 Phone: 1-800-854-7179 E-mail: AutomotiveIHS.com Website: http:/
