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 9 NAVISTAR, INC. Material, Parts, and Process Specifications (
2、MPAPS) NUMBER: MPAPS S-E-1.101-GS/PL Former Designation: ESP-E-1.101-GS TITLE: Hex Nuts English Series- Not Recommended (Noun Code 5780) CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-E-1.101-GS - May 2008 PRINTED COP
3、IES 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
4、practices and to determine the applicability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format; Combined GS, PP, NPP, NR. 1.0 GENERAL: This specification conforms with American National Standard B-18.2.2. Sizes from 1/4 thru 1-1/2 inch in the coarse thread series and from
5、 1/4 thru 1 inch in the fine thread series are unified dimensionally with British and Canadian Standards with the exception that International has retained 1-14 UNS as standard. 2.0 CONTENTS: Page General 1 Policy for Selecting Parts for New Design 2 Service Parts Substitution Policy 2 Top and Beari
6、ng Surfaces of Nuts 2 Width Across Flats 2 Corner Fill 2 Concentricity of Tapped Hole 3 Countersink 3 Slots 3 Threads 3 Identification 3 Material 3 Finish 3 Restricted Chemical Substances 3 Surface Discontinuities 3 Hex Nuts 3 Hex Jam Nuts 5 Hex Thick Nuts 6 Hex Thick Slotted Nuts 7 Hex Slotted Nuts
7、 8 Technical Information 9 NUMBER: MPAPS S-E-1.101-GS/PL TITLE: Hex 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 assume all patent liability. 2015 by Navistar,
8、 Inc. JUNE 2015 Page 2 of 9 3.0 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. Thread
9、s: Coarse Sizes: 1/4, 5/16, 3/8, 7/16, 1/2, 5/8, 3/4, 1, 1-1/4 and 1-1/2 Material and Finish: Type 5 Zinc Trivalent (ZN8A) Type 8 Phosphate Coating (PHC) 4.0 SERVICE PARTS SUBSTITUTION POLICY: In the event that engineering does not indicate a “Do not substitute“ in engineering specifications, the fo
10、llowing 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. Hex Nuts. Jam. Thick and Slotted To be Replaced Service Replacement Type 5 material with Plain (PLN) Type 5 material
11、with Zinc Trivalent (ZN8A) finish or type 8 material with phosphate coating (PHC) if type 5 (ZN8A) is not set up for service. Type 5 material with Phosphate Coating (PHC) Type 8 material with phosphate coating (PHC) Type 8 material with Plain (PLN) Finish Type 8 material with phosphate coating (PHC)
12、 5.0 TOPS AND BEARING SURFACES OF NUTS: Nuts in sizes 5/8 inch nominal size and smaller will be double chamfered. Larger size nuts will be double chamfered or have washer faced bearing surface and chamfered top. The diameter of chamfer circle on double chamfered nuts and diameter of washer face will
13、 be within the limits of the maximum width across flats and 95 percent of the minimum width across flats. The tops of washer faced nuts will be flat and the diameter of chamfer circle will be equal to the maximum width across flats within a tolerance of minus 15 percent. The length of chamfer at hex
14、 corners will be from 5 to 15 percent of the basic thread diameter. The surface of chamfer may be slightly convex or rounded. Bearing surfaces will be flat and perpendicular to the axis of the threaded hole within the FIR (Full Indicator Reading) limits specified for the respective nut type and stre
15、ngth level. 6.0 WIDTH ACROSS FLATS: Maximum width across flats will not be exceeded. No transverse section through the nut between 25 and 75 percent of the actual nut thickness as measured from the bearing surface will be less than the minimum width across flats. 7.0 CORNER FILL: A rounding or lack
16、of fill at junction of hex corners with chamfer will be permissible provided the width across corners is within specified limits at and beyond a distance equal to 17.5 percent of the basic thread diameter from the chamfered faces. NUMBER: MPAPS S-E-1.101-GS/PL TITLE: Hex Nuts REVISION: 1506 This doc
17、ument 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 3 of 9 8.0 CONCENTRICITY OF TAPPED HOLE: Axis of tapped hole will be concen
18、tric with axis of nut body within a tolerance equal to 3 percent (6 percent FIR) of the maximum width across flats. 9.0 COUNTERSINK: Tapped holes will be countersunk on the bearing face or faces. The maximum countersink diameter will be the thread basic (nominal) major diameter plus .030 inch for 3/
19、8 inch nominal size nuts and smaller, and 1.08 times the basic major diameter for nuts larger than 3/8 inch. No part of the threaded portion will project beyond the bearing surface. 10.0 SLOTS: Slots will be normal to nut flats. Contour of bottom of slots will be at manufacturers option. Requirement
20、s for gaging slots are given in ANSI B-18.2.2, Appendix II. 11.0 THREADS: Threads will be Unified Series, Class 2B, in accordance with American National Standard B1.1. 12.0 IDENTIFICATION: Type 8 hex nuts will be marked for type identification in accordance with MPAPS F -31, Part II. 13.0 MATERIAL:
21、Steel nuts, Types 5 or 8, per MPAPS F-31, Part II. Brass (BRS) C36000 or equivalent, hard temper per CEMS C-3. Stainless Steel Type 18-8 (SST-304 as designated on part number page) per MPAPS A-37. Type 18-8 is a non-magnetic general purpose stainless with excellent corrosion resistance. Stainless St
22、eel Type 410 (SST-410) is a magnetic general purpose stainless with good corrosion resistance and excellent strength properties. SST-410 will be supplied in the annealed condition; if higher strength is needed, a new drawing will be created. Both 18-8 and 410 Stainless Steel will be *passivated per
23、specification MPAPS A-37. 14.0 FINISH: As designated by part number, nuts will be furnished plain, plated or coated in accordance with MPAPS and class listed below. Zinc Trivalent, Class 8A (ZN8A) on steel MPAPS G-20, Class 8A. Phosphate Coating (PHC) MPAPS G-1, Class B-2. 15.0 RESTRICTED CHEMICAL S
24、UBSTANCES: Effective January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the MPAPS B-50 specification. 16.0 SURFACE DISCONTINUITIES: Surface discontinuities will be determined by methods shown in MPAPS F-31. Part II. 17.0 HEX NUTS: NUM
25、BER: MPAPS S-E-1.101-GS/PL TITLE: Hex 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 assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 4 of 9 Di
26、mensions in inches: Nominal Size Or Basic Major Diameter of Thread Hex Nuts C E D Specified Proof Load Width Across Flats Width Across Corners Thickness Hex Nuts Up to 150,000 Psi 150,000 psi and Greater Basic Max Min Max Min Basic Max Min Runout of Bearing Face, FIR max 1/4 7/16 .438 .428 .505 .488
27、 7/32 .226 .212 .015 .010 5/16 1/2 .500 .489 .577 .557 17/64 .273 .258 .016 .011 3/8 9/16 .562 .551 .650 .628 21/64 .337 .320 .017 .012 7/16 11/16 .688 .675 .794 .768 3/8 .385 .365 .018 .013 1/2 3/4 .750 .736 .866 .840 7/16 .448 .427 .019 .014 * 9/16 7/8 .875 .861 1.010 .982 31/64 .496 .473 .020 .01
28、5 5/8 15/16 .938 .922 1.083 1.051 35/64 .559 .535 .021 .016 3/4 1- 1/8 1.125 1.088 1.299 1.240 41/64 .665 .617 .023 .018 * 7/8 1- 5/16 1.312 1.269 1.516 1.447 3/4 .776 .726 .025 .020 1 1- 1/2 1.500 1.450 1.732 1.653 55/64 .887 .831 .027 .022 * 1-1/8 1- 11/16 1.688 1.631 1.949 1.859 31/32 .999 .939 .
29、030 .025 1-1/4 1- 7/8 1.875 1.812 2.165 2.066 1- 1/16 1.094 1.030 .033 .028 * 1-3/8 2- 1/16 2.062 1.994 2.382 2.273 1- 11/64 1.206 1.138 .036 .031 1-1/2 2- 1/4 2.250 2.175 2.598 2.480 1- 9/32 1.317 1.245 .039 .034 * NON-PREFERRED * Not Preferred for New Design 17.1 Part List: 17.1.1 Approved: Nomina
30、l Size-TPI Finish Material Part Number 1/4 -20 ZN8F 5 120375 1/4 -20 PHC 8 25519R1 5/16 -18 ZN8F 5 120376 5/ 16-18 PHC 8 25520R1 3/8 -16 ZN8F 5 120377 3/8 -16 PHC 8 25522R1 1/2 -13 ZN8F 5 120378 1/2 -13 PHC 8 25526R1 5/8 -11 PHC 8 25528R1 3/4 -10 PHC 8 25529R1 1 1/4 - 7 PHC 8 25984R1 1/4 - 20 PLN 5
31、109084 1/4 - 20 PHC 5 118613 1/4 - 20 PLN 8 23232R1 1/4 - 20 ZN8F 8 25402R1 1/4 - 20 PLN SST-304 25458R1 1/4 - 20 PLN SST-410 27298R1 1/4 - 28 PLN 5 103024 1/4 - 28 PHC 8 26030R1 5/16 - 18 PLN 5 102634 5/16 - 18 ZN8F 8 27254R1 5/16 - 18 PLN SST-304 26302R1 5/16 - 18 PLN SST-410 27299R1 * 5/16 - 24 P
32、HC 8 26059R1 Nominal Size-TPI Finish Material Part Number 3/8 - 16 PHC 5 118615 3/8 - 16 ZN8F 8 21333R1 * 3/8 - 16 ZN8F 8 40434R1 3/8 - 16 PLN SST-304 25727R1 3/8 - 24 PLN 5 103026 3/8 - 24 ZN8F 5 120369 3/8 - 24 PHC 8 25523R1 7/16 - 14 PHC 8 25524R1 7/16 - 20 ZN8F 5 271506 7/16 - 20 PHC 8 25525R1 1
33、/2 - 13 PLN 5 102637 * 1/2 - 13 PLN 5 18277R1 1/2 - 13 ZN8F 8 21330R1 1/2 - 20 PHC 8 25527R1 9/16 - 12 PHC 8 25758R1 5/8 - 18 ZN8F 8 225861 3/4 - 16 PLN 5 218197 3/4 - 16 PLN 8 218404 3/4 - 16 ZN8F 8 426639 1 - 14 ZN8A 8 40342R1 5/16 - 18 PHC 5 118614 3/8 - 16 PLN 5 102635 1/2 - 20 PHC 5 118627 * =
34、Left Hand Thread NUMBER: MPAPS S-E-1.101-GS/PL TITLE: Hex 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 assume all patent liability. 2015 by Navistar, Inc. JUNE
35、 2015 Page 5 of 9 18.0 HEX JAM NUTS: 18.1 Application Guide: It is recommended that Regular Hex Nuts (section 17.0) be given first consideration. Jam Nuts have become increasingly costly and difficult to obtain due to lack of demand in the industry. Dimensions in inches: Nominal C E D Jam Size Nuts
36、Or Basic Major Width Across Flats Width Across Corners Thickness Hex Jam Nuts All Strength Levels Diameter of Thread Basic Max Min Max Min Basic Max Min Runout of Bearing Face, FIR max 1/4 7/16 .438 .428 .505 .488 5/32 .163 .150 .015 5/16 1/2 .500 .489 .577 .557 3/16 .195 .180 .016 3/8 9/16 .562 .55
37、1 .650 .628 7/32 .227 .210 .017 7/16 11/16 .688 .675 .794 .768 1/4 .260 .240 .018 1/2 3/4 .750 .736 .866 .840 5/16 .323 .302 .019 9/16 7/8 .875 .861 1.010 .982 5/16 .324 .301 .020 5/8 15/16 .938 .922 1.083 1.051 3/8 .387 .363 .021 3/4 1- 1/8 1.125 1.088 1.299 1.240 27/64 .446 .398 .023 7/8 1- 5/16 1
38、.312 1.269 1.516 1.447 31/64 .510 .458 .025 1 1- 1/2 1.500 1.450 1.732 1.653 35/64 .575 .519 .027 1-1/8 1- 11/16 1.688 1.631 1.949 1.859 39/64 .639 .579 .030 1-1/4 1- 7/8 1.875 1.812 2.165 2.066 23/32 .751 .687 .033 1-3/8 2- 1/16 2.062 1.994 2.382 2.273 25/32 .815 .747 .036 1-1/2 2- 1/4 2.250 2.175
39、2.598 2.480 27/32 .880 .808 .039 18.2 Part List: 18.2.1 Not for New Design : Nominal Size-TPI Finish Material Part Number 1/4 - 20 PHC 5 118643 1/4 - 28 PHC 5 118623 1/4 - 28 PHC 8 25930R1 5/16 18 ZN8A 5 124824 5/16 18 PHC 8 26061R1 5/16 - 24 PLN 5 114493 5/16 - 24 PHC 5 118624 5/16 - 24 PHC 8 25931
40、R1 Nominal Size-TPI Finish Material Part Number 3/8 - 16 PLN 5 114503 3/8 - 16 ZN8A 5 124829 3/8 - 16 PHC 8 25932R1 3/8 - 24 ZN8A 5 124925 3/8 - 24 PHC 5 118625 7/16 - 20 ZN8A 5 272123 7/16 - 14 PHC 8 25960R1 * 7/16 - 14 PHC 8 26484R1 NOT PREFERRED FOR NEW DESIGN NUMBER: MPAPS S-E-1.101-GS/PL TITLE:
41、 Hex 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 assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 6 of 9 Nominal Size-TPI Finish Material Pa
42、rt Number 1/2 - 13 ZN8A 5 120238 1/2 - 13 PHC 5 118647 1/2 - 13 PHC 8 25933R1 1/2 - 20 ZN8A 5 124934 9/16 - 18 PLN 5 114497 5/8 - 18 ZN8A 5 124944 5/8 - 18 PHC 5 118629 Nominal Size-TPI Finish Material Part Number 3/4 - 10 PLN 5 218443 3/4 - 16 ZN8A 5 219758 3/4 - 16 PHC 5 427350 3/4 - 16 PHC 8 2654
43、6R1 1 - 14 ZN8A 5 219760 1 - 14 PHC 5 26920R1 1 1/8 - 12 PHC 8 26577R1 * = Left Hand Thread Part number 124925 replaces part number 23460R1 (3/8-24, ZN8A, Type 5). 19.0 HEX THICK NUTS: 19.1 Application Guide: It is recommended that Regular hex nuts (section 17.0) be given first consideration for new
44、 design in order to reduce the variety of nuts in use. Dimensions in inches: C E D Specified Proof Load Width Across Flats Width Across Corners Thickness Up to 150,000 psi 150,000 psi and Greater Nominal Size Basic Max Min Max Min Basic Max Min Runout of Bearing Face, FIR max 1/4 7/16 .438 .428 .505
45、 .488 9/32 .288 .274 .015 .010 5/16 1/2 .500 .489 .577 .557 21/64 .336 .320 .016 .011 3/8 9/16 .562 .551 .650 .628 13/32 .415 .398 .017 .012 7/16 11/16 .688 .675 .794 .768 29/64 .463 .444 .018 .013 1/2 3/4 .750 .736 .866 .840 9/16 .573 .552 .019 .014 9/16 7/8 .875 .861 1.010 .982 39/64 .621 .598 .02
46、0 .015 5/8 15/16 .938 .922 1.083 1.051 23/32 .731 .706 .021 .016 3/4 1- 1/8 1.125 1.088 1.299 1.240 13/16 .827 .798 .023 .018 7/8 1- 5/16 1.312 1.269 1.516 1.447 29/32 .922 .890 .025 .020 1 1- 1/2 1.500 1.450 1.732 1.653 1 1.018 .982 .027 .022 1-1/8 1- 11/16 1.688 1.631 1.949 1.859 1- 5/32 1.176 1.1
47、36 .030 .025 1-1/4 1- 7/8 1.875 1.812 2.165 2.066 1- 1/4 1.272 1.228 .033 .028 1-3/8 2- 1/16 2.062 1.994 2.382 2.273 1- 3/8 1.399 1.351 .036 .031 1-1/2 2- 1/4 2.250 2.175 2.598 2.480 1- 1/2 1.526 1.474 .039 .034 NOT RECOMMENDED FOR NEW DESIGN NUMBER: MPAPS S-E-1.101-GS/PL TITLE: Hex 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 assume all patent li
