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 Navistar, Inc. JUNE 2015 Page 1 of 3 NAVISTAR, INC. Material, Parts, and Process Specifications (MPA
2、PS) NUMBER: MPAPS S-E-71.101-GS/PL Former Designation: ESP-E-71.101-GS TITLE: Stamped 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-71.101-GS - August 2006 PRINTED COPIES OF T
3、HIS 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 practice
4、s and to determine the applicability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format; Combined GS, PP. 1.0 GENERAL: This specification covers performance and other requirements for stamped nuts described in section 10.0. Formed thread stamped nuts are single thread nuts
5、 with the thread engaging portion spirally formed permitting free spinning run down on the bolt. Self-threading stamped nuts are turned on an “unthreaded stud“ (any projection without screw threads). Generally the projection is solid or tubular metal or plastic. 2.0 APPLICATIONS: Stamped nuts are ge
6、nerally used for lighter duty applications, where the primary stress is applied across the axis of the bolt or stud and the tension load on the nut is moderate. These types of fasteners are often used to reduce assembly costs. Formed thread stamped nuts have a self-cleaning action which allows assem
7、bly to bolts clogged with paint, dirt, burrs or other foreign elements. 3.0 MISCELLANEOUS DIMENSIONS: Taper on sides of hexagon portions of nuts (angle between one side and the axis of nut) will not exceed one degree, the maximum limit specified being the largest dimension. Tolerance on steel stock
8、thickness will be plus or minus .001 inch for thicknesses up to and including .028 inch, and plus or minus .0015 inch for heavier thicknesses. 4.0 THREAD EMBOSSMENTS: Detail of the thread engaging portion of formed thread style nuts will be such as to permit nut to assemble readily with the specifie
9、d screw and not strip or deform at the recommended torques. The edges around the opening will be spirally formed to match the pitch of the screw threads and, as indicated, the top or top and bottom corners on edges of holes will be swaged to provide flats for bearing on flanks of the mating thread.
10、The detail and formation of embossments in thread forming style nuts will be such as to enable nuts to cut or form threads on cast or wire studs conforming to the recommended stud designs contained herein, at or below the recommended torques. The formed hole in these embossments will accept plain cy
11、lindrical gages having diameters conforming to the tabulated formed hole gage diameters when inserted parallel to the axis of the nut. 5.0 SCREW LENGTH: The proper machine screw length to be used with single thread engaging nuts, is to allow one and one-half threads to protrude beyond the thread eng
12、aging element of the NUMBER: MPAPS S-E-71.101-GS/PL TITLE: Stamped Nut 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 Navistar, Inc.
13、 JUNE 2015 Page 2 of 3 fastener. Sheet metal screws with tapered ends (Types AB and B) should protrude two or three threads beyond the thread-engaging element to assure engagement on the full screw root diameter. 6.0 MATERIAL: Spring steel, 1050 thru 1065 per MPAPS A-0, Part I, suitably processed to
14、 meet the performance requirements of the specification. 7.0 FINISH: Nuts will be furnished plain, plated or coated in accordance with the International Engineering Material Specification and class listed below. Plain (PLN). Zinc Trivalent (ZN6A) MPAPS G-20, Class 6A. Phosphate Coating (PHC) MPAPS G
15、-1, Class B-2. Chromium Bright (CRB) CEMS G-19, Part III, Class 13. 8.0 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. 9.0 SURFACE DISCONTINUITIES: Allowable
16、limits defined in MPAPS F-31, Part II. Dimensions in inches: TYPE AC (Acorn Type) Nominal Size L Torque Tension Max lb-In lb 6 -32 .21 9 130 8 -32 .24 11 150 10 -24 .25 18 240 10 -32 .25 15 150 1/4 -20 .28 38 350 5/16-18 .36 70 470 3/8 -16 .34 70 500 Flange Base Types Type DE DO Flange Dia L L Nomin
17、al Torque Tension Torque Tension lb Size Basic Min lb-in lb Min lb-in 6 -32 .437 - - - .28 16 120 6 -32 .531 - - - .30 16 110 8 -32 .469 .25 21 160 .30 23 160 8 -32 .625 - - - .31 28 150 8 -32 .750 - - - - - - 10 -24 .500 - - - .34 38 240 10 -24 .562 - - - .34 42 230 10 -24 .625 - - - .36 42 220 10
18、-24 .750 - - - .38 42 200 10 -24 .875 - - - .39 42 180 10 -32 .500 .25 26 180 .30 30 200 1/4 -20 .594 - - - .39 64 350 1/4 -20 .687 - - - .41 64 300 1/4 -20 .812 - - - .42 64 300 1/4 -20 .875 - - - .42 70 300 1/4 20 1.000 - - - .45 64 260 5/16-18 .812 - - - .44 110 470 3/8 -32 .625 .23 40 200 - - -
19、7/16-20 .812 .33 54 370 - - - NUMBER: MPAPS S-E-71.101-GS/PL TITLE: Stamped Nut 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 Navis
20、tar, Inc. JUNE 2015 Page 3 of 3 10.0 FORMED THREAD FLANGED TYPES ACORN TYPE STAMP NUTS: 10.1 Part List: 10.1.1 Approved: TYPE DO 1-NOTCH TYPE DE 1-NOTCH Size 10 10 10 12 1/4 1/4 10 3/8 Threads Per Inch 24 24 32 24 20 20 32 32 C P D W Nominal Width Width Across Corners Nominal Thickness Washer Diamet
21、er 3/8 .424 .212 1/2 3/8 .424 .248 3/4 3/8 .424 .208 1/2 3/8 .424 .220 9/16 7/16 .494 .239 19/32 7/16 .494 .271 13/16 3/8 .424 .166 1/2 1/2 .565 .155 5/8 Finish PART NUMBERS - STEEL Zinc Trivalent (ZN6A) 441239 * Formerly designated Type G * Formerly designated as Type GG. 11.0 TECHNICAL INFORMATION
22、: 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:/
