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. 2014 by Navistar, Inc. APRIL 2014 Page 1 of 6 NAVISTAR, INC. Material, Parts, and Process Specifications
2、(MPAPS) NUMBER: MPAPS F-1053 Former Designation: TMS-1053 TITLE: U-Bolts, High Strength CURRENT REV. No.: 1404 DATE: April 2014 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: TMS-1053 Dec. 2012 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVI
3、SION 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 practices and to determine the applicability of regula
4、tory limits prior to use. Change Notice: Updated to new MPAPS format; revised Section 4.1 related to rolled threads; updated Section 4.2 on phosphate coating classification; revised Table 1 related to Type B elongation requirement; revised Table 2 related to Type B CDSR carbon level; updated Section
5、 8.0 drawing designations; editorial changes. Reference: File 20-2C Keywords: U-Bolts, high strength fasteners. 1.0 APPLICATION This specification covers two types (Type A and Type B) of high strength U-Bolts used to fasten springs, fifth wheels, tow loops, and similar parts, where higher clamp load
6、 capacity is required. Both types of U-Bolts can be provided as either quenched and tempered (Q a rating of Grade 9-G or better is required. To reduce embrittlement effects during the coating process, the use of acidic washes/cleaners should be avoided. Coated production U-bolts will be supplied to
7、Navistar without any significant scratches, scrapes, or coating defects which might compromise the corrosion performance of the parts. Potential new suppliers of MPAPS F-1053 U-bolts will provide 5 production representative coated U-bolt samples to Navistar Fastener Engineering to validate the 96-hr
8、 corrosion performance. NUMBER: MPAPS F-1053 TITLE: U-Bolts, High Strength REVISION: 1404 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. 2014 by Navista
9、r, Inc. APRIL 2014 Page 3 of 6 4.2.1 Other Coatings: Other coatings may be used if approved by Navistar Fastener Engineering or Materials Engineering Depts., after evaluation for corrosion resistance and torque-tension properties. 4.3 Mechanical Properties (ASTM F 606) U-Bolts will meet the mechanic
10、al property requirements for each U-Bolt TYPE as indicated in Table 1. Table 1. Mechanical Properties* Mechanical Property U-Bolt, Type A * U-Bolt, Type B Ultimate Tensile Strength, min 915 MPa (133 000 psi) 1035 MPa (150 000 psi) Proof Stress (0.01% Offset), min 725 MPa (105 000 psi) 827 MPa (120 0
11、00 psi) Elongation % in 5 cm (2 in), min 12% 12% Reduction In Area %, min 35% minimum 35% minimum Hardness 28-39 HRC 33-39 HRC *Type A U-bolts, CDSR, ” dia. and under, will meet the mechanical property requirements of the Type B U-bolt as indicated in the Table. *NOTE: Hardness testing is not requir
12、ed if tensile testing shows that the parts meet the property requirements for the applicable bolt type. 4.4 Hardness Hardness of the heat-treated bolts shall be measured at mid-radius on a section one diameter from the bolt end. The surface hardness of Q the max shank diameter will be the nominal th
13、read diameter and the thread size only shall be specified. The thread rolling process shall control the minimum shank dimension. Example: 7/8 -14UNRF or - 16UNRF NUMBER: MPAPS F-1053 TITLE: U-Bolts, High Strength REVISION: 1404 This document is restricted and may not be sent outside Navistar, Inc. o
14、r reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2014 by Navistar, Inc. APRIL 2014 Page 6 of 6 9.0 APPROVED SUPPLIERS* 1) McCoy Bolt Works, Inc., Fort Wayne, IN *NOTE: TMS-1053 U-BOLTS MAY NOT BE PROCURED FROM NON-APPROVED SUP
15、PLIERS WITHOUT PRIOR APPROVAL FROM NAVISTAR FASTENER ENGINEERING AND MATERIALS ENGINEERING UPON SUBMITTAL OF TEST REPORTS OR EQUIVALENT SHOWING PRODUCT COMPLIANCE TO ALL REQUIREMENTS OF MPAPS F-1053. 10.0 TECHNICAL INFORMATION For further information related to the technical content of this specific
16、ation, contact: Suppliers may purchase controlled copies of this specification by contacting: Materials Engineering and Technology Dept. 10400 W. North Ave. 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:/ A.0 GENERAL INFORMATION (Not A Requirement) The following steels are suggested for the two types of bolts: Cold Drawn-Stress Relieved (CDSR) 1541, 1552 Heat Treated (Q&T) 1038, 1045, 1050, 1541, 15B30, 15B46, 4037
