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 3 NAVISTAR, INC. Material, Parts, and Process Specifications (
2、MPAPS) NUMBER: MPAPS S-E-72.101-GS/PL Former Designation: ESP-E-72.101-GS TITLE: Crown Nuts English Series (Noun Code 5780) CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-E-72.101-GS - February 2010 PRINTED COPIES OF
3、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 practic
4、es and to determine the applicability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format; Combined GS, PP. 1.0 MISCELLANEOUS DIMENSIONS: The bearing surface of nuts will be flat with chamfered corners, the diameter of bearing circle being the maximum width across flats wit
5、hin a tolerance of minus 5 percent. Tops of hexagons will be chamfered from the boss diameter. The length of chamfers at hexagon corners will be from .05 to .15 times the basic thread diameter. The surface of chamfers may be slightly convex or rounded. A rounding or lack of fill at junction of corne
6、rs with chamfer will be permissible provided the minimum width across corners is reached and maintained beyond a distance of .175 times the basic thread diameter from both the bearing face and the top of hexagon portion of nut. The bearing surface will be at right angles to the axis of the threaded
7、hole within 2 for 5/8 inch size, or smaller; and within 1 for larger sizes. (The maximum total runout of bearing face equals the tangent of the specified angle times the width across flats.) Actual size across flats will be not less than specified minimum limit between two planes, perpendicular to t
8、he axis of the nut, spaced at a distance equal to .25 times hexagon thickness above and below the mid-plane through the nut flats. Tolerance on dimensions not otherwise controlled will be plus and minus .010 inch. The threaded hole will be at true position within a tolerance zone having a radius equ
9、al to .03 times the maximum width across flats, regardless of feature size, and will be countersunk on the bearing face. The maximum countersink diameter will be the thread basic diameter plus .025 inch for 3/8 inch size, or smaller; and plus .06 times the basic thread diameter for larger sizes. The
10、 minimum countersink diameter and depth will be such that no part of the threaded portion projects beyond the bearing face. 2.0 THREADS: Threads will be Unified Coarse or Fine (UNC, UNF) Class 2B. 3.0 MATERIAL: Steel (STL), Type 5, per MPAPS F-31, Part II. Stainless steel (SST-304) Type 304 per MPAP
11、S A-37. Brass (BRS) C36000 or equivalent, hard temper, per CEMS C-3. NUMBER: MPAPS S-E-72.101-GS/PL TITLE: Crown Nuts 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 a
12、ssume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 2 of 3 Nominal Size Range Minimum Proof Load, psi Low Crown Nuts High Crown Nuts Coarse Thread Fine Thread Coarse Thread Fine Thread 1/4 to 3/4, incl 7/8 and 1 1-1/8 and 1-1/4 132,000 126,000 115,500 120,000 115,000 105,000 141,000 13
13、5,000 123,000 128,000 122,500 112,000 4.0 FINISHES: Nuts will be furnished plain, plated or coated in accordance with MPAPS and class listed below: Zinc Trivalent (ZN6A) on steel MPAPS G-20, Class 6A. Chromium Bright (CRB) on steel CEMS G-19, Part III, Class 3, 5, or 8 depending on pitch. Chromium B
14、right (CRB) on brass CEMSG-19, Part III, Class 3, 5, or 8 depending on pitch. Black Organic (BLZ) on steel TMS-4113 5.0 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 specif
15、ication. 6.0 SURFACE DISCONTINUITIES: Will conform to allowable limits shown in SAE Recommended Practice J122, “Sampling Procedure“ and “Methods of Test“ per MPAPS F-31, Part II. 7.0 HIGH CROWN NUTS: NUMBER: MPAPS S-E-72.101-GS/PL TITLE: Crown Nuts REVISION: 1506 This document is restricted and may
16、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 3 of 3 Dimensions in inches: Nominal SizeThreads Per InchTHREAD DETAIL C p O D H R S T U Pitch Minor Wi
17、dth Across Body DiaOverall HeightHexagon HeightNose RadiusBody RadiusDrill Depth Tap Depth Diameter Diameter Corners Min Max Min Max Max Min Max Min Max Min 6 32 .1177 .1212 .104 .114 .3125 .302 .361 .344 .30 .42 .17 .05 .25 .28 .188 8 32 .1437 .1475 .130 .139 .3125 .302 .361 .344 .30 .42 .17 .05 .2
18、5 .28 .188 10 24 .1629 .1672 .145 .156 .3750 .362 .433 .413 .36 .52 .20 .06 .30 .34 .250 10 32 .1697 .1736 .156 .164 .3750 .362 .433 .413 .36 .52 .20 .06 .30 .34 .250 12 24 .1889 .1933 .171 .181 .3750 .362 .433 .413 .36 .52 .20 .06 .30 .38 .281 1/4 20 .2175 .2223 .196 .207 .4375 .428 .505 .488 .41 .
19、59 .23 .06 .34 .41 .312 1/4 28 .2268 .2311 .211 .220 .4375 .428 .505 .488 .41 .59 .23 .06 .34 .41 .312 5/16 18 .2764 .2817 .252 .265 .5000 .489 .577 .557 .47 .69 .28 .08 .41 .47 .375 5/16 24 .2854 .2902 .267 .277 .5000 .489 .577 .557 .47 .69 .28 .08 .41 .47 .375 3/8 16 .3344 .3401 .307 .321 .5625 .5
20、51 .650 .628 .53 .78 .31 .09 .44 .56 .469 3/8 24 .3479 .3528 .330 .340 .5625 .551 .650 .628 .53 .78 .31 .09 .44 .56 .469 7/16 14 .3911 .3972 .360 .376 .6250 .612 .722 .698 .59 .88 .34 .09 .50 .62 .531 7/16 20 .4050 .4102 .383 .395 .6250 .612 .722 .698 .59 .88 .34 .09 .50 .62 .531 1/2 13 .4500 .4565
21、417 .434 .7500 .736 .866 .840 .72 1.03 .42 .12 .59 .75 .625 1/2 20 .4675 .4731 .446 .457 .7500 .736 .866 .840 .72 1.03 .42 .12 .59 .75 .625 9/16 12 .5084 .5152 .472 .490 .8750 .861 1.010 .982 .84 1.19 .48 .16 .69 .81 .688 9/16 18 .5264 .5323 .502 .515 .8750 .861 1.010 .982 .84 1.19 .48 .16 .69 .81
22、688 5/8 11 .5660 .5732 .527 .564 .9375 .922 1.083 1.051 .91 1.28 .53 .16 .75 .91 .781 5/8 18 .5889 .5949 .565 .578 .9375 .922 1.083 1.051 .91 1.28 .53 .16 .75 .91 .781 3/4 10 .6850 .6927 .642 .663 1.0625 1.045 1.227 1.191 1.03 1.45 .59 .17 .84 1.06 .938 3/4 16 .7094 .7159 .682 .696 1.0625 1.045 1.2
23、27 1.191 1.03 1.45 .59 .17 .84 1.06 .938 7/8 9 .8028 .8110 .755 .778 1.2500 1.231 1.443 1.403 1.22 1.72 .70 .20 .98 1.22 1.094 7/8 14 .8286 .8356 .798 .814 1.2500 1.231 1.443 1.403 1.22 1.72 .70 .20 .98 1.22 1.094 1 8 .9188 .9276 .865 .890 1.4375 1.417 1.660 1.615 1.41 1.97 .81 .23 1.14 1.38 1.250 1
24、 14 .9459 .9535 .910 .928 1.4375 1.417 1.660 1.615 1.41 1.97 .81 .23 1.14 1.38 1.250 1-1/8 7 1.0322 1.0416 .970 .998 1.6250 1.602 1.876 1.826 1.59 2.22 .92 .27 1.28 1.59 1.406 1-1/8 12 1.0709 1.0787 1.035 1.053 1.6250 1.602 1.876 1.826 1.59 2.22 .92 .27 1.28 1.59 1.406 1-1/4 7 1.1572 1.1668 1.095 1.
25、123 1.8125 1.788 2.093 2.038 1.78 2.47 1.03 .28 1.44 1.75 1.562 1-1/4 12 1.1959 1.2039 1.160 1.178 1.8125 1.788 2.093 2.038 1.78 2.47 1.03 .28 1.44 1.75 1.562 7.1 Part List: 7.1.1 Approved: Nominal Size-TPI Finish Material Part Number 1/4 -20 BLZ STL 1655013C1 3/8 -16 PLN SST-304 40024R1 8.0 TECHNIC
26、AL 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:/
