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 4 NAVISTAR, INC. Material, Parts, and Process Specifications (
2、MPAPS) NUMBER: MPAPS S-F-1.301-GS/PL Former Designation: ESP-F-1.301-GS TITLE: Tooth Lock Washers - English Series (Noun Code 9720) CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-F-1.301-GS - August 2006 PRINTED COPIE
3、S OF THIS 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 pr
4、actices and to determine the applicability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format; Combined GS, PP, NPP. 1.0 GENERAL: This standard covers the dimensions, physical properties, and methods of testing Tooth Lock Washers which are available in two distinct types,
5、A and B, as indicated. They are specified under a single series of part numbers and are procurable from separate sources. Exercise of purchasers option as to type is thereby controlled by selection of source. The tooth lock washers described herein are in conformance with American National Standard
6、B-18.21.1. It should be noted that the word “Lock“ appearing in the names of the products in this standard is a generic term historically associated with their identification and is not intended to imply an indefinite permanency of fixity in attachments where they are used. 2.0 MANUFACTURING DETAIL:
7、 The number of teeth, the length of teeth, the width of the rim and the thickness of the washer over the teeth (free height) will be optional with the manufacturer, with the provision, however, that the projection of the teeth on both sides of the washer will be uniform within a tolerance equal to o
8、ne half of the projection on one side. Washers will be symmetrical in shape and free from defects that might affect their serviceability. 3.0 POLICY FOR SELECTING PARTS FOR NEW DESIGN: Approved parts are so designated to reduce variety of parts and assure maximum availability, interchangeability, an
9、d cost savings in volume buying. For new design, parts shall be selected from “Approved“ part list only. Type: Internal-External Finishes: Zinc Trivalent (ZN6A) Materials: SAE 1050 or 1066 Steel (STL) Heat Treated Sizes: #4, #6, #8, #10, #12, 1/4, 5/16, 3/8, 1/2, and 5/8 4.0 SERVICE PARTS SUBSTITUTI
10、ON 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 subsequently approved by engineering departments worldwide.
11、 NUMBER: MPAPS S-F-1.301-GS/PL TITLE: Tooth Lock Washers 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 Navistar, Inc. JUNE 2015
12、Page 2 of 4 5.0 Tooth Lock Washers To Be Replaced Service Replacement Internal Tooth with Plain (PLN) Finish Internal tooth with zinc trivalent (ZN6A) finish or phosphate coated (PHC) (if ZN6A equivalent is not set up for service). External Tooth with Plain (PLN) Finish External tooth with zinc triv
13、alent (ZN6A) finish or phosphate coated (PHC) (if ZN6A equivalent is not set up for service). Internal-External tooth with Plain (PLN) Finish Internal-External tooth with zinc trivalent (ZN6A) finish or phosphate coated (PHC) (if ZN6A equivalent is not set up for service). Countersunk External tooth
14、 with Plain (PLN) Finish Countersunk External tooth with zinc trivalent (ZN6A) finish or phosphate coated (PHC) (if ZN6A equivalent is not set up for service). 6.0 MATERIAL: Steel (STL) SAE 1050 or 1066 heat treated to Rc 40-50. It is recommended that the lighter, more sensitive Rockwell A scale be
15、used when testing washers of thin section. Decarburization will be removed before hardness test. Stainless Steel (SST) Type 302 per MPAPS A-37. Note: Stainless steel washers will be *passivated per International Engineering Standard Parts MPAPS A-37. 7.0 FINISH: Washers will be furnished in accordan
16、ce with MPAPS and class listed below: Plain (PLN) Zinc Trivalent (ZN6A) MPAPS G-20, Class 6A Phosphate Coating (PHC) MPAPS G-1, Class B2 Chromium Bright (CRB) CEMS G-19, Part III, Class 13 CRB Note: Chromium plating on carbon steel tooth lock washers is generally unsatisfactory and should be avoided
17、. 8.0 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. 9.0 CLAMPING TEST: Plated washers will be clamped to a height equal to the actual material thickness plus
18、 .005 inch for a period of 24 hours without breaking. The clamping will be accomplished between parallel flat surfaces for flat varieties of tooth washers and between mating countersunk holes and cones for countersunk tooth washers. 10.0 TWIST TEST: The rim of the lock washer will be cut or severed
19、with a cold chisel or cutting pliers and the severed ends will be gripped by pliers or vise and pliers. Separation of the ends in the form of a helix, to a distance equal to the inside diameter of the washer, will not result in fracture. When the ends are separated a greater distance and the washer
20、does fracture, the structure at the point of fracture will show a fine grain, and the washer up to the instant of fracture will deliver a tough springy reaction. NUMBER: MPAPS S-F-1.301-GS/PL TITLE: Tooth Lock Washers REVISION: 1506 This document is restricted and may not be sent outside Navistar, I
21、nc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 3 of 4 11.0 WORKMANSHIP: Lock washers will not contain imperfections which affect usability or serviceability such as excessive amount
22、s of burrs, seams, laps, loose scale or irregular surfaces. Dimensions in inches: Nominal Washer Size A B C Nominal Washer Size A B C Inside Outside Inside Outside Diameter Diameter Thickness Diameter Diameter Thickness Max Min Max Min Max Min Max Min Max Min Max Min .900 .865 .040 .032 .475 .460 .0
23、21 .016 5/16 (.312) .332 .320 .985 .965 .045 .037 No. 4 (.112) .123 .115 .510 .495 .021 .017 1.070 1.045 .050 .042 .610 .580 .021 .017 1.155 1.130 .050 .042 .985 .965 .045 .037 .510 .495 .028 .023 3/8 (.375) .398 .384 1.070 1.045 .050 .042 No. 6 (.138) .150 .141 .610 .580 .028 .023 1.155 1.130 .050
24、.042 .690 .670 .028 .023 1.260 1.220 .050 .042 1.070 1.045 .050 .042 .610 .580 .034 .028 * 7/16 (.438) .464 .448 1.155 1.130 .050 .042 No. 8 (.164) .176 .168 .690 .670 .034 .028 1.260 1.220 .055 .047 .760 .740 .034 .028 1.315 1.290 .055 .047 .610 .580 .034 .028 1.260 1.220 .055 .047 .690 .670 .040 .
25、032 1/2 (.500) .530 .512 1.315 1.290 .055 .047 No. 10 (.190) .204 .195 .760 .740 .040 .032 1.410 1.380 .060 .052 .900 .880 .040 .032 1.620 1.590 .067 .059 .690 .670 .040 .032 1.315 1.290 .055 .047 .760 .725 .040 .032 * 9/16 (.562) .596 .576 1.430 1.380 .060 .052 No. 12 (.216) .231 .221 .900 .880 .04
26、0 .032 1.620 1.590 .067 .059 .985 .965 .045 .037 1.830 1.797 .067 .059 .760 .725 .040 .032 1.410 1.380 .060 .052 .900 .880 .040 .032 5/8 (.625) .663 .640 1.620 1.590 .067 .059 1/4 (.250) .267 .256 .985 .965 .045 .037 1.830 1.797 .067 .059 1.070 1.045 .045 .037 1.975 1.935 .067 .059 The decimal equiv
27、alent of the numbered sizes and both the decimal and fractional dimension of all other sizes represent the basic diameter of the screw or bolt that should be used with the washer. * Non-Preferred. NUMBER: MPAPS S-F-1.301-GS/PL TITLE: Tooth Lock Washers REVISION: 1506 This document is restricted and
28、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 4 of 4 12.0 PART LIST: 12.1 Approved: Nominal Washer Inside Outside Material Finish Part Size Type
29、Diameter Diameter Number 10 EXT-INT .195 .580 - ZN6A 178378 1/4 EXT-INT .256 .725 - ZN6A 174916 8 INT .168 .325 STL PLN 115544 10 CTSK-EXT .195 .354 STL ZN6A 138597 10 INT .195 .365 STL PLN 115545 1/4 CTSK-EXT .255 .454 STL ZN6A 138604 1/4 INT .256 .460 STL PLN 115547 1/4 INT .256 .460 STL ZN6A 1204
30、23 5/16 INT .320 .594 STL ZN6A 23060R1 1/2 HVY-INT .512 .880 STL PLN 118975 7/16 INT .448 .740 STL ZN6A 131718 1/2 HVY-INT .512 .880 STL ZN6A 180447 1/2 EXT .513 .880 STL PLN 114608 5/8 INT .640 1.045 STL PHC 138559 3/4 INT .769 1.220 STL ZN6A 138561 1 INT 1.019 1.590 STL ZN6A 138572 10 INT .195 .36
31、5 STL ZN6A 121801 10 INT .195 .365 STL PHC 138534 12.2 Not for New Design: Nominal Washer Inside Outside Material Finish Part Size Type Diameter Diameter Number 8 EXT-INT .168 .670 - ZN6A 178369 5/16 EXT-INT .320 .865 - ZN6A 178532 3/8 EXT-INT .384 .965 - ZN6A 178551 1/2 EXT-INT .512 1.220 - ZN6A 17
32、8591 5/8 EXT-INT .640 1.380 - ZN6A 178627 10 EXT .195 .395 STL ZN6A 138479 1/4 INT .256 .460 SST PLN 21158R1 5/8 INT .640 1.045 STL ZN6A 138557 7/8 INT .894 1.364 STL ZN6A 138566 1 1/4 INT 1.275 1.921 STL ZN6A 138584 Abbreviations: EXT-INT External-Internal, CTSK Countersunk; HVY - Heavy 13.0 TECHNI
33、CAL 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:/
