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 7 NAVISTAR, INC. Material, Parts, and Process Specifications (
2、MPAPS) NUMBER: MPAPS S-FM-1.101-GS/PL Former Designation: ESP-FM-1.101-GS TITLE: Helical Spring Lock WashersMetric Series CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-FM-1.101-GS - August 2006 PRINTED COPIES OF THIS
3、 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 practices a
4、nd to determine the applicability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format; Combined GS, GI, PP. 1.0 GENERAL: Implementation of this standard must be in accordance with the policies and procedures outlined in MPAPS S-A-0.101. There may also be divisional suppleme
5、ntal instructions in regard to use of metric standards that should be taken into account. This standard may differ in some respects with certain segments of ISO and national standards. In recognition of these possible differences, the sizes and tolerance ranges used were established in an effort to
6、enable the use of commercially available items, dimensionally interchangeable worldwide. This specification contains the essentials of the following standards: British Standards Institution: BS 4464 German Institute of Standardization: DIN 127 Standards Association of Australia: AS 1968 Helical spri
7、ng lock washers are Form B per DIN 127 or Type B per BS 4464. 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
8、 The inclusion of dimensional data is not intended to imply that all the washers described are stock production sizes. Inch dimensioned standard helical spring lock washers may be found in MPAPS S-F-1.101-GS/PL NUMBER: MPAPS S-FM-1.101-GS/PL TITLE: Helical Spring Lock Washers REVISION: 1506 This do
9、cument 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 2 of 7 2.0 CONTENTS: 3.0 DESIGN CONSIDERATION: Helical spring lock washers
10、 are not recommended for use on soft materials, oversize, or elongated holes. For high strength joints where there is sufficient clearance and proper pre-load can be applied, hardened plain washers should be used. Metric helical spring lock washers in this standard approximate the “Inch Regular Seri
11、es“ (formerly designated Medium). 4.0 METRIC-INCH RELATED SIZES: During the inch to metric design transition period, the following chart of related sizes can be used for reference. This information is not to be considered as a recommendation for substitutions but only as a means of determining appro
12、ximate dimensional equivalents. Metric Series mm Approximate Inch Series 3 #4, #5 4 #6, #8 5 #10 6 #12, 1/4 8 5/16 10 3/8, 7/16 12 1/2 *14 9/16 16 5/8 20 3/4 *24 7/8, 1 *30 1-1/8, 1-1/4 *36 1-1/2 * Non-Preferred Page General 1 Design Consideration 2 Metric-Inch Related Sizes 2 Hardness comparison 3
13、Color Coding 3 Method of Designation 3 Policy for Selecting Parts for New Design 3 Shape 3 Manufacturing Detail 3 Material 3 Finishes 4 Restricted Chemical Substances 4 Short Load Test 4 Prolonged Load Test 4 Torsion Test 5 Workmanship 5 Dimensions 6 Part List 7 Technical Information 7 NUMBER: MPAPS
14、 S-FM-1.101-GS/PL TITLE: Helical Spring 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 Page
15、 3 of 7 5.0 HARDNESS COMPARISON: Hardness Metric Series Inch Series Max (Rockwell) C51 C53 Min (Rockwell) C44 C45 Range (Max to Min) 7 8 6.0 COLOR CODING: Not recommended, except in cases where adequate insurance is needed to prevent mixing of “metric parts“ with look-alike “inch parts.“ The color b
16、lue is standard identifier used in some industries. This must be handled internally at individual plants where needed and is meant to be supplemental to the normal finish and easily deleted when the need for supplemental identification no longer exists. The supplemental blue color should not be used
17、 on material such as stainless steel when specified for cosmetic purposes, or phosphate coating which may cause a loss of color identity. 7.0 METHOD OF DESIGNATION: Washers will be designated on purchase orders by nominal diameter, word description, material, finish and part number. 5 mm, Helical Sp
18、ring Lock Washer, Steel, ZN6A, Part Number 8.0 POLICY FOR SELECTING PARTS FOR NEW DESIGN: Approved parts are so designated to reduce the variety of parts and assure maximum availability, interchangeability, and cost savings. For new design, parts shall be selected from “Approved“ part list only. Nom
19、inal Sizes: 3, 4, 5, 6, 8, 10, 12, 16, 20 mm Material: Hardened Spring Steel (STL) Finish: Zinc Trivalent (ZN6A) 9.0 SHAPE: The helical spring lock washers will be evenly wound with uniform pitch and during use the washers will remain circular and their section will be such as not to cause them to s
20、pread when set down by a nut, under normal service conditions. 10.0 MANUFACTURING DETAIL: Washers will be coiled such that the free height is approximately twice the thickness of the washer section. The flat faces and inner and outer peripheries will be smooth and free from knurling, serration, die
21、marks, deep scratches, etc., although slight feed roll marks will be permissible. 11.0 MATERIAL: Carbon steel washers will be made from lock washer wire meeting the limits of decarburization shown below. They will be heat treated to a Rockwell Hardness of C 44-51. The washers will be prepared for ch
22、ecking material hardness by grinding both sides flat and parallel to assure the removal of a decarburized or plated surface. During the grinding operation, care must be exercised to prevent the temperature of the washer from exceeding 120 C. NUMBER: MPAPS S-FM-1.101-GS/PL TITLE: Helical Spring Lock
23、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 Page 4 of 7 Decarburization Limits Dimensions in
24、millimeters: Diameter of Round Wire or Maximum Depth of Free Ferrite Maximum Total Affected Sections of Equivalent Area Depth, (Free Ferrite Plus mm Partial Decarburization) Up to 3.5, inclusive 0.05 0.15 Over 3.5 to 6.3, inclusive 0.08 0.2 Over 6.3 to 9.5, inclusive 0.1 0.25 Over 9.5 to 0.13, inclu
25、sive 0.15 0.38 Stainless steel washers will be fabricated from AISI 420, or equivalent per MPAPS A-37; heat treated after coiling by quenching in air or oil as dictated by proportions of washer section and tempering at a temperature not to exceed 425 C to a hardness of Rockwell C 44-51, or equivalen
26、t. 12.0 FINISHES: Washers are furnished plain, plated, or coated in accordance with MPAPS and class listed below: Zinc Trivalent (ZN6A) MPAPS G-20, Class 6A. Phosphate Coated (PHC) MPAPS G-1, Class B2. The determinant of plating thickness will be the thickness of plating on the flat surface of the w
27、asher approximately midway between the inside and outside diameters. Because of the high degree of strength and hardness, plated spring lock washers must be heated at a temperature sufficiently high and for a period sufficiently long to relieve possible hydrogen embrittlement. 13.0 RESTRICTED CHEMIC
28、AL 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. 14.0 SHORT LOAD TEST: Spring lock washers will withstand being compressed flat for a period of two minutes by the application of
29、 the test load specified in table below. When the load is released, the height of the lock washer must not be less than the specified minimum. 15.0 PROLONGED LOAD TEST: Electroplated lock washers will be subjected to the prolonged load test. Ten spring washers assembled on a pin and separated from e
30、ach other by a flat washer must withstand being compressed by the test load specified below for 48 hours without fracturing. On removal of the load, the lock washer height must not be less than the minimum specified below. NUMBER: MPAPS S-FM-1.101-GS/PL TITLE: Helical Spring Lock Washers REVISION: 1
31、506 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 5 of 7 Size mm Test Load Minimum Spring Lock Washer Height afte
32、r Loading mm kN Short Load Test Prolonged Load Test 4 2.9 1.53 1.44 5 4.7 1.53 1.44 6 6.7 2.72 2.56 8 12.2 3.4 3.2 10 19.3 3.74 3.52 12 28 4.25 4 *14 38.2 5.1 4.8 16 52.2 5.95 5.6 *18 64 5.95 5.6 20 81 6.8 6.4 *22 101 6.8 6.4 *24 117 8.5 8 *27 153 8.5 8 *30 187 10.2 9.6 *36 272 10.2 9.6 * Non-Prefer
33、red 16.0 TORSION TEST: Spring lock washers will withstand being twisted through 90 in the direction that increases their face height without sign of fracture. When twisted to fracture, the fraction will show a fine grain and the washer will have a tough springy reaction up to the instant of fracture
34、 17.0 WORKMANSHIP: The surface of spring lock washers will be smooth and free from burrs, rust, pit marks, loose scale, and other defects that might affect their serviceability. The gap and relationship of severed ends will be such as to prevent washers tangling and to assure all washers will compr
35、ess flat. NUMBER: MPAPS S-FM-1.101-GS/PL TITLE: Helical Spring 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 Navist
36、ar, Inc. JUNE 2015 Page 6 of 7 18.0 DIMENSIONS: Dimensions in millimeters: Nominal Washer Size or Nominal Fastener Diameter A B C R Inside Diameter Rectangular Section Width Trapezoidal Section Width Rectangular Section Thickness Trapezoidal Mean Section Thickness Radius Max Min Max Min Min Max Min
37、Max Min 3 3.3 3.1 1.4 1.2 1.19 0.9 0.7 0.94 0.79 0.25 4 4.4 4.1 1.6 1.4 1.4 1 0.8 1.17 1.02 0.3 5 5.4 5.1 1.9 1.7 1.57 1.3 1.1 1.35 1.19 0.4 6 6.5 6.1 2.65 2.35 2.77 1.7 1.5 1.83 1.57 0.5 8 8.5 8.1 3.15 2.85 3.18 2.1 1.9 2.24 1.98 0.65 10 10.7 10.2 3.7 3.3 3.58 2.35 2.05 2.64 2.39 0.7 12 12.7 12.2 4
38、2 3.8 4.34 2.65 2.35 3.43 3.18 0.8 *14 14.7 14.2 4.7 4.3 4.78 3.15 2.85 3.84 3.58 1.0 16 17 16.2 5.2 4.8 5.16 3.7 3.3 4.22 3.96 1.15 *18 19 18.2 5.2 4.8 - 3.7 3.3 - - 1.15 20 21.2 20.3 6.2 5.8 5.94 4.2 3.8 5.03 4.78 1.3 *22 23.2 22.3 6.2 5.8 - 4.2 3.8 - - 1.5 *24 25.5 24.3 7.25 6.75 7.14 5.2 4.8 6.
39、45 5.94 1.65 *27 28.5 27.5 7.25 6.75 - 5.2 4.8 - - 1.65 *30 31.7 30.5 8.25 7.75 8.74 6.2 5.8 8.05 7.54 2 *36 37.7 36.5 10.25 9.75 10.31 6.2 5.8 9.63 9.12 2 * Non-Preferred NUMBER: MPAPS S-FM-1.101-GS/PL TITLE: Helical Spring Lock Washers REVISION: 1506 This document is restricted and may not be sent
40、 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 7 of 7 19.0 PART LIST: 19.1 Approved: Nominal Size Min I.D. Finish Material Part Number 3 3.1 ZN6A STL 30273R1 6 6
41、1 ZN6A STL 933833R1 8 8.1 ZN6A STL 934309R1 19.2 Not for New Design: Nominal Size Min I.D. Finish Material Part Number 4 4.1 ZN6A STL 933832R1 5 5.1 ZN6A STL 30264R1 10 10.2 ZN6A STL 933965R1 12 12.2 ZN6A STL 933966R1 16 16.2 ZN6A STL 934185R1 20 20.3 ZN6A STL 933815R1 20.0 TECHNICAL INFORMATION: F
42、or 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:/
