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 4 NAVISTAR, INC. Material, Parts, and Process Specifications (
2、MPAPS) NUMBER: MPAPS S-BM-4.101-GS/PL Former Designation: ESP-BM-4.101-GS TITLE: Prevailing-Torque Hex Head Bolts Metric Series (Noun Code 0810) CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-BM-4.101-GS - February 20
3、13 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 appropriate safe
4、ty 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: A prevailing-torque bolt is one which is torsionally resistant to rotation due to a self-contained prevailing-torque feature and not
5、 because of a compressive load developed against the under head bearing surface, a tensile load developed in the shank, or frictional devices designed into the underside of the head. These latter types normally are considered “free running“ locking bolts and have high breakaway torque requirements b
6、ut no prevailing-torque. A prevailing-torque bolt intends to delay or prevent total disassembly of joint when clamp force is decreased or ceases to exist. The threaded fasteners covered by this standard are prevailing-torque hexagon head bolts with a non-metallic plastic patch bonded to a specified
7、portion of the threads to provide the prevailing-torque feature. These bolts are for applications where temperatures will not exceed 121 C. General Information for metric hex head bolts shown in MPAPS S-BM-1.101-GS/PL will also apply for these Prevailing-Torque Hex Head Bolts. NUMBER: MPAPS S-BM-4.1
8、01-GS/PL TITLE: Prevailing-Torque Hex Head Bolts 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 2 o
9、f 5 2.0 CONTENTS: Page General 1 Policy for Selecting Parts for New Design 2 Basic Bolt 2 Surface Discontinuities 2 Method of Designation 2 Prevailing-Torque Feature 2 Prevailing-Torque Performance Requirements 3 Test Method 3 Restricted Chemical Substances 4 Part List 4 Technical Information 5 3.0
10、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. For new design, parts shall be selected from “Approved“ part list only. Material: Class 10.9 Finish: Phosphate Coating (PHC) N
11、ominal Sizes: M6, M8, M10, M12, M16, M20, M24, M30, and M36 Length Incrementation: Same as Metric Hex Head Bolts 4.0 BASIC BOLT: The bolt must comply in all respects with the General Specifications for Metric Hex Head Bolts, MPAPS S-BM-1.101-GS/PL. 5.0 SURFACE DISCONTINUITIES: Per MPAPS F-31. The us
12、e of serrated thread rolling dies is optional for the parts contained in and referenced to this standard. 6.0 METHOD OF DESIGNATION: Prevailing-Torque Hex Head Bolts will be designated on purchase order by size, length, word description, material, special feature, if any, finish, and part number as
13、shown in the following example: M 10 x 50, Hex Head Bolt, Class 10.9, Prevailing-Torque, PHC, Part Number 7.0 PREVAILING-TORQUE FEATURE: The location and size of the non-metallic plastic patch must comply with the illustration shown above. Bolts will assemble a minimum of one full turn by hand into
14、any mating internally threaded component that is accepted by a properly selected GO thread plug gage. The prevailing-torque feature will be free from visible porosity, voids, and cracks, and will be uniform in color without streaks, dark areas or other indicators of contamination or degradation. It
15、will be firmly attached to the bolt and will not loosen under normal handling. It will be chemically inert to Regular Gear Lubricant Grade 90 HR, CEMS B-22; Heavy Duty Type Engine Oil Grade lOW-30HD, MPAPS B-21, Part II; Anti-freeze, Single Phase, Ethylene Glycol Base, MPAPS B-1; and “Hy-Tran Fluid,
16、“ CEMS B-6. NUMBER: MPAPS S-BM-4.101-GS/PL TITLE: Prevailing-Torque Hex Head Bolts 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
17、 Navistar, Inc. JUNE 2015 Page 3 of 5 8.0 PREVAILING-TORQUE PERFORMANCE REQUIREMENTS: The prevailing-torque occurring during first installation, or any subsequent installation or removal, will not exceed the first installation prevailing-torque specified in Table 1 when tested as specified in Test M
18、ethod. In addition, the highest and lowest prevailing-torque reading occurring during first and fifth removals will equal or exceed the highest and lowest removal torques respectively as specified in Table 1. TABLE 1 Nominal Size Clamp Load 10.9 Bolt PREVAILING TORQUES First First Fifth Installation
19、 Removal Removal kN Nm Max Nm Min Nm Min M5 M6 8.8 14 2.3 4.5 0.36 0.56 0.23 0.34 M8 23 10 0.9 0.58 M10 36 14 1.8 1.1 M12 52 21 2.6 1.5 M14 72 30 3.6 2.3 M16 98 40 5 3.4 M20 150 60 8 5.5 M24 220 90 13 8.5 M30 350 120 19 13 M36 510 150 28 18 9.0 TEST METHOD: Test Nut: The test nut will be a hex nut c
20、onforming to MPAPS S-EM-1.101-GS/PL; phosphate coated per MPAPS G-1, Class B-2; Class 6G thread; carbon steel with a hardness of Rockwell 36 HRC max. A new test nut will be used for each bolt tested. 9.1 Tensile Load Measure Device: The tensile load measuring device will be an instrument capable of
21、measuring the actual tension induced in the test bolt as it is being tightened. The device will be accurate within l-1/2 percent of the tensile clamp load to be induced. Diameter of the test bolt clearance hole in the backing plate will be the test bolt nominal diameter plus 0.8 mm for sizes up to a
22、nd including M24, and plus 1.6 mm for sizes beyond M24. 9.2 Prevailing-Torque Test Procedure: The sample lock screw will be assembled with a test washer and a test nut in a load measuring device with the test washer located adjacent to the component to be turned. During the complete performance of t
23、he test, either the lock screw or the test nut will be turned. When the lock screw is turned, the restraining mechanism will be such that it imparts no radial distortion to the test nut. The lock screw or test nut will be advanced until its bearing surface is seated against the test washer. The tota
24、l thickness of spacer material in the test assembly will be selected so that at seating, the locking element of the screw will be fully engaged within the test nut, and a minimum length of lock screw equivalent to two thread pitches will project through the top of the test nut. During this first ins
25、tallation the maximum prevailing torque (first on torque) occurring while the lock screw of test nut is in motion and prior to development of any axial load will be measured and recorded. Tightening will be continued until an axial tensile clamp load equal to the load as specified in Table 1 for the
26、 applicable screw size and property class is developed. The axial tensile clamp load in the lock screw will be reduced to zero by backing the turned member off until the test washer is free to move by the fingers. Following a pause (it is generally NUMBER: MPAPS S-BM-4.101-GS/PL TITLE: Prevailing-To
27、rque Hex Head Bolts 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 5 necessary to change the w
28、rench to one of a lower torque capacity), removal will be continued and the maximum torque (first removal torque) occurring while the lock screw or test nut is being backed off throughout the next 360 degree of rotation will be measured and recorded. The lock screw or test nut will then be backed of
29、f until the locking element is disengaged from the test nut. The lock screw and test nut will be reassembled and disassembled four more times. On each reassembly the lock screw will be assembled with the test nut until the turned element is seated against the test washer but no tensile load will be
30、induced in the lock screw. During the fifth removal, the maximum torque (fifth removal torque) occurring while the lock screw or test nut is being backed off throughout the first 360 degree of rotation will be measured and recorded. At no time during the four additional installations and removal sho
31、uld the prevailing torque exceed the maximum prevailing torque as specified in Table 1. Sufficient time will elapse between torquing cycles to prevent overheating (warm to the touch) of the test assembly. Speed of driving will not exceed 30 RPM. 10.0 RESTRICTED CHEMICAL SUBSTANCES: Effective January
32、 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the MPAPS B-50 specification. 11.0 PART LIST: 11.1 Approved: Nominal Size Length Finish Material Part Number M6 16 PHC 10.9 30920R1 M8 25 PHC 10.9 40267R1 M8 25 PLN SST-304 40205R1 M8 30 PHC
33、 10.9 30815R1 M8 30 PLN SST-304 40206R1 M8 35 PLN SST-304 40208R1 M8 40 PHC 10.9 30837R1 M10 20 PHC 10.9 30223R1 M10 30 PHC 10.9 30224R1 M10 40 PHC 10.9 30254R1 M10 45 PHC 10.9 30383R1 M10 80 PHC 10.9 30255R1 M12 25 PHC 10.9 30216R1 M12 30 PHC 10.9 30225R1 M12 35 PHC 10.9 30286R1 M12 40 PHC 10.9 302
34、87R1 M12 50 PHC 10.9 30231R1 M16 25 PHC 10.9 30795R1 M16 30 PHC 10.9 30260R1 M16 35 PHC 10.9 30269R1 M16 45 PHC 10.9 30215R1 M16 80 PHC 10.9 30298R1 M16 90 PHC 10.9 40276R1 M16 100 PHC 10.9 40430R1 M20 100 PHC 10.9 30977R1 NUMBER: MPAPS S-BM-4.101-GS/PL TITLE: Prevailing-Torque Hex Head Bolts REVISI
35、ON: 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 5 of 5 12.0 TECHNICAL INFORMATION: For further information
36、 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:/
