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 5 NAVISTAR, INC. Material, Parts, and Process Specifications (
2、MPAPS) NUMBER: MPAPS S-F-1.101-GS/PL Former Designation: ESP-F-1.101-GS TITLE: Spring Lock Washers English Series Not Recommended (Noun Code 9720) CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-F-1.101-GS - December 2
3、012 PRINTED COPIES 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 saf
4、ety and health practices 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: Lock washers covered in this standard are intended for general applications and based primarily on A.S.M.E. Standard B-18.21.1
5、. Spring lock washers are available in Regular, Heavy and Extra Duty series. Washers in certain materials are not available in all of the series covered by this standard. It should be noted that the word “Lock“ appearing in the names of the products in this standard is a generic term historically as
6、sociated with their identification and is not intended to imply an indefinite permanency of fixity in attachments where they are used. 2.0 CONTENTS: Page General 1 Policy for Selecting Parts for New Design 2 Washer Section 2 Manufacturing Detail 2 Material 2 Decarburization 2 Finishes 2 Restricted C
7、hemical Substances 3 Embrittlement 3 Temper Test 3 Twist Test 3 Regular Helical Spring Lock Washers 4 Part List 5 Technical Information 5 NUMBER: MPAPS S-F-1.101-GS/PL TITLE: Spring Lock Washers REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced witho
8、ut permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 2 of 5 3.0 POLICY FOR SELECTING PARTS FOR NEW DESIGN: Approved parts are so designated to reduce variety of parts and assure maximum availability, interchang
9、eability, and cost savings in volume buying. For new design, parts shall be selected from “Approved“ part list only. Sizes: 1/4, 5/16, 3/8, 1/2, 5/8, and 3/4 Type: Regular Series Finish: Zinc Trivalent (ZN6A) Material: Steel (STL) 4.0 WASHER SECTION: The section of finished washers will be slightly
10、trapezoidal in shape with the thickness at the inner periphery greater than the thickness at the outer periphery by an amount varying from a minimum of .0005 inch to a maximum of .001 inch per .0156 inch of the minimum section width. The minimum thickness specified in the dimensional tables represen
11、ts the nominal mean thickness of the trapezoid. Reduced to formulas, the increase in thickness from the outer periphery to inner periphery is timinus toor .032W (minimum) to .064W (maximum). The tolerance on the nominal mean thickness of the trapezoid will be plus and equal to the following: Size No
12、. 12 and smaller .006 inch Size 1/4 to 13/16 .010 inch Size 7/8 to 1-1/2 .020 inch 5.0 MANUFACTURING DETAIL: Washers will be coiled such that the free height is approximately twice the thickness of washer section. The gap and relationship of severed ends will be such as to prevent washers tangling a
13、nd insure that the washers will compress flat. The internal and external circumferential edges will be rounded sufficiently to avoid checks. The flat faces and inner and outer peripheries will be smooth and free from knurling, serrations, die marks, deep scratches, etc., although slight feed roll ma
14、rks will be permissible. 6.0 MATERIAL: Steel (STL) SAE 1050-1065, with a hardness range of Rockwell 38-46 HRC. Washers will be ground to assure removal of decarburized or plated surfaces before hardness test Stainless Steel (SST), Type 302 or 305, per MPAPS A-37, with a hardness range of Rockwell 35
15、-43 HRC 7.0 DECARBURIZATION: Carbon steel lock washers shall meet the limits for decarburization shown in Table 1. Method of testing decarburization limits shall conform to SAE J 419. Table 1 Diameter of Round Wire or Sections of Equivalent Area Maximum Free Ferrite Maximum Total Affected Depth, (Fr
16、ee Ferrite Plus Partial Decarburization Up to .140 incl .002 .006 Over .140 to .250 Incl .003 .008 Over .250 to .375 Incl .004 .010 Over .375 to .500 Incl .006 .015 8.0 FINISHES: Washers will be furnished in accordance with MPAPS and class listed below: Plain (PLN). Zinc Trivalent (ZN6A) MPAPS G-20,
17、 Class 6A or Class 6AM. Phosphate Coated (PHC) MPAPS G-1, Class B2. NUMBER: MPAPS S-F-1.101-GS/PL TITLE: 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 requir
18、ed to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 3 of 5 9.0 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. 10.0 EMBRITTLEMENT: Plated
19、or coated washers may be subject to hydrogen embrittlement and will be suitably treated or baked in such a manner as to obviate such embrittlement. Plated or coated carbon steel washers will not break after having been compressed flat between hardened and ground steel plates for a minimum period of
20、48 hours. 11.0 TEMPER TEST: After compressing to flat and releasing, the free height of a washer will be at least two-thirds of the original free height. 12.0 TWIST TEST: The washer will be gripped in vise jaws. The ends of the washers will be free and an axis passing through the slot will be parall
21、el to and slightly above the top of the vise. A 90-degree segment of the free end of the washer will be gripped in wrench jaws as shown in illustration below. Edges of the wrench jaws will be in a plane parallel to the vise. Movement of the wrench in a direction that increases the free height of the
22、 spring lock washer will twist carbon steel washers through an angle of 90 degrees and corrosion resistant steel and non-ferrous washers through an angle of 45 degrees without sign of fracture. When the washer fractures at a greater degree of twist, the structure at the point of fracture will show a
23、 fine grain, and the washer up to the instant of fracture will deliver a tough springy reaction. NUMBER: MPAPS S-F-1.101-GS/PL TITLE: Spring Lock Washers REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical St
24、andards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 4 of 5 13.0 REGULAR HELICAL SPRING LOCK WASHERS: Nominal Washer Size A B C W Inside Outside Mean Section Thickness Section Diameter Diameter ti + t o Width 2 Max Min Max Min Min No. 2 .086 .094 .088
25、 .172 .020 .035 No. 3 .099 .107 .101 .195 .025 .040 No. 4 .112 .120 .114 .209 .025 .040 No. 5 .125 .133 .127 .236 .031 .047 No. 6 .138 .148 .141 .250 .031 .047 No. 8 .164 .174 .167 .293 .040 .055 No. 10 .190 .200 .193 .334 .047 .062 No. 12 .216 .227 .220 .377 .056 .070 1/4 .250 .260 .252 .487 .062 .
26、109 5/16 .312 .322 .314 .583 .078 .125 3/8 .375 .385 .377 .680 .094 .141 7/16 .438 .450 .440 .776 .109 .156 1/2 .500 .512 .502 .869 .125 .171 9/16 .562 .574 .564 .965 .141 .188 5/8 .625 .640 .628 1.072 .156 .203 11/16 .688 .703 .691 1.169 .172 .219 3/4 .750 .765 .753 1.264 .188 .234 13/16 .812 .828
27、.816 1.359 .203 .250 7/8 .875 .890 .878 1.455 .219 .266 15/16 .938 .953 .941 1.551 .234 .281 1 1.000 1.015 1.003 1.647 .250 .297 1-1/16 1.062 1.080 1.066 1.742 .266 .312 1-1/8 1.125 1.144 1.129 1.838 .281 .328 Dimensions in inches: A B C W Nominal Washer Size Inside Outside Mean Section Thickness Se
28、ction Diameter Diameter ti + t o Width 2 Max Min Max Min Min 1-3/ 16 1.188 1.208 1.192 1.934 .297 .344 1-1/4 1.250 1.272 1.254 2.028 .312 .359 1-5/16 1.312 1.335 1.317 2.124 .328 .375 1-3/8 1.375 1.399 1.379 2.210 .344 .391 1-7/16 1.438 1.462 1.442 2.314 .359 .406 1-1/2 1.500 1.524 1.504 2.409 .375
29、.422 NUMBER: MPAPS S-F-1.101-GS/PL TITLE: 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
30、2015 Page 5 of 5 14.0 PART LIST: 14.1 Approved: Nominal Size Inside Diameter Series Material Finish Part Number 3/4 .763 REGULAR STL ZN6A 131046 6 .141 REGULAR STL PHC 116117 8 .168 REGULAR SST PLN 27301R1 10 .194 REGULAR STL PHC 115707 1/4 .255 REGULAR STL PHC 115109 1/4 .255 REGULAR SST PLN 27303R
31、1 5/16 .318 REGULAR STL PHC 116120 3/8 .382 REGULAR STL PHC 115093 3/8 .382 REGULAR SST PLN 27500R1 7/16 .446 REGULAR STL PHC 115314 7/16 .446 REGULAR SST PLN 27501R1 1/2 .509 REGULAR STL PHC 116121 1/2 .509 HEAVY STL ZN6A 131101 9/16 .572 REGULAR STL PHC 116122 5/8 .636 HEAVY STL ZN6A 131140 1 1.01
32、7 HEAVY STL PHC 131169 1 1/2 1.525 REGULAR STL ZN6A 131052 14.2 Not for New Design: Nominal Size Inside Diameter Series Material Finish Part Number 1 /4 .255 REGULAR STL ZN6A 120380 5/16 .318 REGULAR STL ZN6A 120214 3/8 .382 REGULAR STL ZN6A 120382 1 /2 509 REGULAR STL ZN6A 120384 5/8 .636 REGULAR S
33、TL ZN6A 121574 6 .141 REGULAR STL ZN6A 131044 8 .168 REGULAR STL ZN6A 121841 10 .194 REGULAR STL ZN6A 120217 10 .194 REGULAR SST PLN 27302R1 5/16 .318 REGULAR SST PLN 27304R1 7/16 .446 REGULAR STL ZN6A 120383 1/2 .509 REGULAR SST PLN 27502R1 15.0 TECHNICAL INFORMATION: For further information relate
34、d 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:/
