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-EM-42.101-GS/PL Former Designation: ESP-EM-42.101-GS TITLE: Tapping Bosses - Metric Series CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-EM-42.101-GS - September 2000 PRINTED COPIES OF THIS DOC
3、UMENT 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 practices and t
4、o determine the applicability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format; Combined GS, GI, PP. 1.0 GENERAL: Implementation of this standard must be in accordance with the policies and procedures outlined in MPAPS S-A-0.101. There may also be supplemental group inst
5、ructions in regard to use of metric standards that should be taken into account. There is no National or International standard on this product. The specifications are based upon local manufacture and user requirements. This standard consists of weldable round and rectangular parts containing a sing
6、le through tapped hole. The following design parameters must be adhered to: Rectangular Parts: F dimensions must be on center line. Length (L) must not exceed five times width (W). Round Parts: Length (L) must not exceed 2 times outside diameter (D). Threads: Coarse only. Nominal Thread Sizes: M6, M
7、8, M10, M12, M16, M20, and M24 Length: 5 mm increments thru 90 mm 10 mm increments over 90 mm thru 200 mm 20 mm increments over 200 mm Width (W) (Rectangular): 12, 16, 20, 25, 30, 35, 40, 50, and 60 mm (Preferred width per ANSI B32.3) Thickness (T) (Rectangular): 8, 10, 12, 16, 20, 25, 30, 35, and 4
8、0 mm (Preferred thickness per ANSI B32.3) Diameter (D) (Round): 12, 20, 25, 30, 40, 45, 50, and 60 mm (Selected preferred diameters per ANSI B32.4) Center of Drilled Hole (E): 1 mm increments only. NUMBER: MPAPS S-EM-42.101-GS/PL TITLE: Tapping Bosses REVISION: 1506 This document is restricted and m
9、ay 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 4 2.0 RESTRICTED CHEMICAL SUBSTANCES: Effective January 1, 2007, all product supplied to the re
10、quirements of this specification must comply with the requirements of the MPAPS B-50 specification. 3.0 DESIGN CONSIDERATION: Coarse thread series only will be considered as part of this standard, because of the following advantages: Less tendency to cross thread. Less likely to be seriously affecte
11、d by decarburization and oversize minor diameter of internal threads. 4.0 METRIC-INCH RELATED SIZES: During the inch to metric design transition period, the following chart of related tapping boss sizes can be used for reference. This information is not to be considered as a recommendation for subst
12、itutions but only as a means of determining approximate dimensional equivalents. Metric Series Approximate mm Inch Series 6 1/4 8 5/16 10 3/8, 7/16 12 1/2 16 9/16, 5/8 20 3/4 24 7/8, 1 5.0 THREADS: The ISO basic profile is essentially the same geometric configuration as the unified screw thread basi
13、c form. The threads will be coarse series, tolerance class 6H. 6.0 THREAD TOLERANCES: The ISO medium class of fit 6H(Int)/6g(Ext) is approximately the same as the 2A(Ext)/2B(Int) allowance in the U.S. unified thread series for comparable size. For example: Thread Allowance M10 x 1.5 - 6H(Int)/6g(Ext
14、) 0.032 mm (.00126 in) 3/8-16 UNC 2A(Ext)/2B(Int) .0013 in (0.033 mm) 7.0 COLOR CODING: Not recommended, particularly for parts which are to be welded during a subsequent assembly operation. The blue color identifier used in some industries has a tendency to adversely affect the welding operation an
15、d produce noxious fumes and odor during welding. NUMBER: MPAPS S-EM-42.101-GS/PL TITLE: Tapping Bosses 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 paten
16、t liability. 2015 by Navistar, Inc. JUNE 2015 Page 3 of 4 8.0 METHOD OF DESIGNATION: Tapping bosses will be designated by size, length, width, diameter, thickness, general product description, material and part number as follows:- M3 x 10 long x 12 diameter, Round Tapping Boss, CST, Part Number M6 x
17、 15 long x 12 wide x 8 thick, Rectangular Tapping Boss, CST, Part Number The absence of a specification for pitch indicates that coarse thread is required; e.g., a coarse thread of the dimensions M6 x 1 is designated as “M6.“ 9.0 EDGES: A breakout of 15% thickness permissible with sheared edges. 10.
18、0 TOLERANCES: (Round Parts) Diameter (D) must be concentric with the axis of threaded hole within 1 mm. Both ends (T) must be square with the axis of threaded hole within 0.41 mm. 11.0 THREADS: Thread form, diameters and associated pitches are in accordance with ISO recommendations. Threads will be
19、made to the tolerances for the medium class fit (6H) as shown in ISO 965/II, General Purpose Metric Screw Threads. 12.0 MATERIAL: As designated by part number, Code 0-202W or 2-202W steel per MPAPS A-0, Part II. 13.0 FINISH: Plain (PLN) or Copper Plated (COP) for special applications (electrical gro
20、und connection). Minimum thickness of copper plating 8 m (0.00030). 14.0 MINIMUM THICKNESS: Where Class 8.8 clamp loads are required, the following chart indicates minimum preferred thickness required. Dimensions in millimeters: Thread Size T Min Thread Size T Min M6 10 M16 25 M8 12 M20 30 M10 16 M2
21、4 40 M12 20 15.0 WORKMANSHIP: Bosses must be free from all defects which might affect their serviceability. 16.0 PART LIST: 16.1 Not for New Design: Nominal Size T Length D Diameter Material Part Number M8 20 20 2-202W 30268R1 NUMBER: MPAPS S-EM-42.101-GS/PL TITLE: Tapping Bosses REVISION: 1506 This
22、 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 4 17.0 TECHNICAL INFORMATION: For further information related to t
23、he 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:/
