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-31.101-GS/PL Former Designation: ESP-E-31.101-GS TITLE: Hex Machine Screw 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-31.101-GS -August 2006 PRINTED
3、 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 safety and hea
4、lth 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: This standard conforms in all essentials with American National Standard B18.6.3 (R 1983) for Hex Machine Screw Nuts. 2.0 POLICY FOR SELE
5、CTING 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. Size & Threads: #6 thru #12, UNC Material: Steel, Ty
6、pe 1 or SST-304 Finishes: Zinc Trivalent, Class 6A (ZN6A) on Steel Plain (PLN) on SST-304 3.0 DIMENSIONS: Hex machine screw nuts will have tops flat with chamfered corners. Diameter of top circle will be equal to the maximum width across flats within a tolerance of minus 15 percent. The bearing surf
7、aces will be perpendicular to the axis of the threaded hole pitch cylinder within a tolerance of 4 degrees. Bottom of hex machine screw nuts are normally flat, but for special purposes may be chamfered if so specified by purchaser. For nuts 1/4 inch and larger, use regular hexagon nuts. 4.0 THREADS:
8、 Threads will be Unified Standard, Class 2B, UNC or UNF series. 5.0 MATERIAL: Steel nuts, Type 1, 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 nonmagnetic general
9、purpose stainless with excellent corrosion resistance. Stainless Steel will be *passivated per specification in MPAPS A-37. NUMBER: MPAPS S-E-31.101-GS/PL TITLE: Hex Machine Screw Nuts REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permiss
10、ion from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 2 of 3 6.0 FINISH: Nuts will be furnished plain, plated, or coated in accordance with the MPAPS and class listed below: Plain (PLN). Zinc (ZN) on brass MPAPS G-20, Cla
11、ss 1. Zinc Trivalent, Class 6A (ZN6A) on steel MPAPS G-20, Class 6A. Phosphate Coating (PHC) MPAPS G-1, Class B-2. 7.0 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 specifi
12、cation. 8.0 WORKMANSHIP: Nuts will not contain imperfections which affect usability or serviceability such as excessive amounts of burrs, seams, laps, loose scale, or irregular surfaces. Dimensions in inches: C E D Basic Threads Width Across Width Across Nominal Thread Per Inch Flats Corners Thickne
13、ss Size Diameter UNC UNF Basic Max Min Max Min Basic Max Min 0 .06 80 5/32 .156 .150 .180 .171 3/64 .050 .043 1 .073 64 72 5/32 .156 .150 .180 .171 3/64 .050 .043 2 .0860 56 64 3/16 .187 .180 .217 .205 1/16 .066 .057 3 4 .0990 .1120 48 40 56 48 3/16 1/4 .187 .250 .180 .241 .217 .289 .205 .275 1/16 3
14、/32 .066 .098 .057 .087 5 .1250 40 44 5/16 .312 .302 .361 .344 7/64 .114 .102 6 .1380 32 40 5/16 .312 .302 .361 .344 7/64 .114 .102 8 .1640 32 36 11/32 .344 .332 .397 .378 1/8 .130 .117 10 .1900 24 32 3/8 .375 .362 .433 .413 1/8 .130 .117 12 .2160 24 28 7/16 .437 .423 .505 .482 5/32 .161 .148 Note:
15、For 1/4 inch and larger size nuts, see Regular Hexagon Nuts in MPAPS S-E-1.101-GS/PL NUMBER: MPAPS S-E-31.101-GS/PL TITLE: Hex Machine Screw Nuts REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards.
16、 Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 3 of 3 9.0 PART LIST: 9.1 Approved: Nominal Size-TPI Finish Material Part Number 6 - 32 ZN6A 1 134530 8 - 32 ZN6A 1 120622 8 - 32 PLN SST-304 27296R1 10 - 24 ZN6A 1 120361 10 - 24 PLN SST-304 27297R1 3 - 48
17、 PLN SST-304 40337R1 8 - 32 PLN BRS 113103 10 - 32 ZN6A 1 120614 10 - 32 PHC 1 115999 10.0 TECHNICAL 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:/
