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-EM-58.101-GS/PL Former Designation: ESP-EM-58.101-GS TITLE: Prevailing Torque Hex Flange Nuts All Metal Metric Series (Noun Code 5780) CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-EM-58.101-GS
3、 - August 2012 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 appr
4、opriate safety and health practices 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 is based on and contains elements of the following standards: American National Standard: ANSI B-18.1
5、6.1M, B-18.16.2M, B-18.16.3M International Organization for Standardization: ISO 7044 General specifications, mechanical and performance requirement, and test requirements for prevailing torque nuts outlined in MPAPS S-EM-56.101-GS/PL are also applicable to this standard. 2.0 APPLICATION GUIDE: To e
6、nsure full benefit of the prevailing torque feature, two fully formed threads must be visible beyond the top surface of the nut. 3.0 RESTRICTED CHEMICAL SUBSTANCES: Effective January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the MPAP
7、S B-50 specification. 4.0 POLICY FOR SELECTING PARTS FOR NEW DESIGN: Approved parts are so designated to reduce variety of parts and assure maximum availability and cost savings: For new design, parts shall be selected from “Approved“ part list only. Nominal Sizes: M6, M8, M10, M12, M16, M20 Materia
8、l: Class 10 Finish: Phosphate Coating (PHC) 5.0 BEARING SURFACE: The bearing surface will be flat to concave to a maximum of 2 degrees from the plane formed by the bearing circle diameter. The plane formed by the bearing circle diameter will be perpendicular to the thread within the runout limit spe
9、cified when measured at diameter Dw. 6.0 HEX HEIGHT: The hex heights will be the distance, measured at a corner of the hex from the junction of hex head with the flange to the top of the head. NUMBER: MPAPS S-EM-58.101-GS/PL TITLE: Prevailing Torque Flange Nuts All Metal REVISION: 1506 This document
10、 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 2 of 3 7.0 WRENCHING HEIGHT: The wrenching height, Ta, is the distance, measured
11、 at a corner of the hex, from the junction of the hex head with the flange to the last plane of full formed hex, i.e., the plane perpendicular to the nut axis which is closest to the top of the head at which the width across corners is within its specified limits. 8.0 CORNER FILL: The rounding due t
12、o lack of fill at the six corners of the hex will be reasonably uniform. 9.0 GAGING OF HEX PORTION: The nut will be gaged using two plain ring gages, A and B, to demonstrate the coincidental acceptability of hex height, wrenching height, corner fill and width across corners. Gage A will be placed ov
13、er the hex and will seat on the flange. Gage B will be placed on the top of the nut normal to the nut axis. The two gages will not be in contact. (Note: The minimum inside diameter of Gage A equals the maximum width across corners; the maximum inside diameter of Gage B equals the minimum width acros
14、s corners minus 0.01 mm; the maximum thickness of Gage A equals or is greater than the computed wrenching height necessary to provide sufficient driveability to develop two times the torsional strength of the properly mated externally threaded component.) 10.0 FLANGE: The top surface of the flange w
15、ill be conical or slightly rounded (convex). The flange periphery will be round within the specified maximum flange diameter and a tolerance of minus 5 percent. The contour of the edge at the flange periphery will be optional provided the minimum flange thickness is maintained at the minimum bearing
16、 circle diameter. 11.0 GAGING OF FLANGE: The flange will be gaged using two plain ring gages, A and C, to demonstrate the coincidental acceptability of flange diameter and thickness. Gage C will be seated on a flat surface and the nut placed on it. Gage A will be placed over the hex portion. The nut
17、 will seat within Gage C and Gages A and C will not be in contact. 12.0 DIMENSIONS: DIMENSIONS OF PREVAILING TORQUE HEX FLANGE NUTS NUMBER: MPAPS S-EM-58.101-GS/PL TITLE: Prevailing Torque Flange Nuts All Metal REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or
18、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 MILLIMETERS: Nominal Nut Thread Dia and Thread Pitch S E M DcDw C Circular Runoutof Bearing R Wa Ta Wb Tb Wc Tc Width Ac
19、ross Flats Width Across Corners Thickness Flange DiaBearing Circle DaFlange Edge Flange TopFillet RadiusGage A Gage B Gage C Inside Dia Thickness Inside Dia Thick-nessInside Dia ThicknessMax Min Max Min Max Min Max Min Min Max Max Max Min Max Min Max Min Min Max Min Max Min M6 x 1 10.00 9.78 11.55 1
20、1.05 7.30 5.70 14.2 12.2 1.1 0.34 0.4 11.56 11.55 3.10 3.09 11.04 11.03 4.0 14.40 14.30 1.19 1.18 M8 x 1.25 13.00 12.73 15.01 14.38 9.40 7.60 17.9 15.8 1.2 0.38 0.5 15.02 15.01 4.50 4.49 14.37 14.36 4.0 18.10 18.00 1.31 1.30 M10 x 1.5 15.00 14.73 17.32 16.64 11.40 9.60 21.8 19.6 1.5 0.43 0.6 17.33 1
21、7.32 5.50 5.49 16.63 16.62 5.0 22.00 21.90 1.81 1.80 M12 x 1.75 18.00 17.73 20.78 20.03 13.80 11.60 26.0 23.8 1.8 0.50 0.7 20.79 20.78 6.70 6.69 20.02 20.01 5.0 26.20 26.10 2.20 2.19 M14 x 2 21.00 20.67 24.25 23.35 15.90 13.30 29.9 27.6 2.1 0.55 0.9 24.26 24.25 7.80 7.79 23.34 23.33 6.0 30.10 30.00
22、2.55 2.54 M16 x 2 24.00 23.67 27.71 26.75 18.30 15.30 34.5 31.9 2.4 0.61 1.0 27.72 27.71 9.00 8.99 26.74 26.73 6.0 34.70 34.60 2.96 2.95 M20 x 2.5 30.00 29.16 34.64 32.95 22.40 18.90 42.8 39.9 3.0 0.76 1.2 34.65 34.64 11.10 11.09 32.94 32.93 6.0 43.00 42.90 3.70 3.69 13.0 PART LIST: 13.1 Approved: N
23、ominal Size Finish Material Part Number M6 PHC 10 40209R1 M6 ZACLR 10 3544378C1 M8 PHC 10 40066R1 M8 ZACLR 10 3544379C1 M10 PHC 10 30754R1 M10 ZACLR 10 3535556C1 M12 PHC 10 30755R1 M12 ZACLR 10 3535859C1 M14 PHC 10 40262R1 M16 PHC 10 30756R1 M16 ZACLR 10 3535554C1 M20 PHC 10 40204R1 M20 ZACLR 10 402
24、40R1 14.0 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:/
