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-DM-61.101-GS/PL Former Designation: ESP-DM-61.101-GS TITLE: Round Head Metallic Drive Screws Metric Series (Noun Code 7450) CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-DM-61.101-GS - August 2
3、006 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 saf
4、ety 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 contains the essentials of the following standards: American National Standard: B-18.6.4 British Standards Insti
5、tution: BS 4174 Metallic drive screws in this standard are primarily for use in cast iron, metal shapes and plastics. These screws are hammered or forced into appropriate holes and are intended for making permanent fastenings. 2.0 POLICY FOR SELECTING PARTS FOR NEW DESIGN: Approved parts are so desi
6、gnated 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. Finishes: Plain (PLN) Zinc Trivalent (ZN6A) Nominal Sizes and Length Incrementation: Dimensions in millimeters: Length Nomi
7、nal Size 0 2 4 6 8 10 12 14 3.2 X 4.8 X X X 6.4 X X X X X 8 X X X X X X 9.5 X X X X X 12.7 X X X 3.0 HEAD HEIGHT: The tabulated head height represents a metal to metal measurement, parallel to axis of screw, from the top of head to the bearing surface. 4.0 BEARING SURFACE: The bearing surface of the
8、 head will be perpendicular to the axis of the screw shank within 2. NUMBER: MPAPS S-DM-61.101-GS/PL TITLE: Round Head Metallic Drive Screws REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Supp
9、liers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 2 of 3 5.0 ECCENTRICITY: The head will not be eccentric with axis of screw by more than 3 percent of the maximum head diameter. Eccentricity is defined as one-half of the full indicator movement (FIM). 6.0 LENGT
10、H: The length of screw will be measured, parallel to axis of screw, from the bearing surface of head to the extreme end of pilot point. The tolerance on length will be as tabulated below: Nominal Length Tolerance on Length Up to 9.5 mm (3/8 inch) Incl. Over 9.5 mm (3/8 inch) 0.5 mm (.02 in) 0.8 mm (
11、03 in) 7.0 THREADS: Threads will have a lead angle of 45 to 65 . 8.0 THREAD LENGTH: Screws will have fully formed threads extending from the base of pilot to the head except that the threads at entering end and under head may have incomplete crests for a length not to exceed one-half of the maximum
12、 screw diameter, due to the natural flow of material in the thread forming operation. 9.0 POINT: Screws will have pilot point, the blunt end of which may be slightly angular due to the natural flow of material in the cut-off process. 10.0 MATERIAL: Carbon steel screws (CST) suitably hardened to meet
13、 the following performance requirement. Screws driven into holes of sizes recommended (see dimensional table) in steel test plates having a hardness of Rockwell B 70 to 85, or in cast iron, will produce mating threads without shearing of the threads on screw or breaking the screw. 11.0 FINISHES: Scr
14、ews will be furnished plain, plated or coated in accordance with the Navistar Engineering Material Specification and Class listed below. Zinc Trivalent (ZN6A) on steel MPAPS G-20, Class 6A. Chromium Bright (CRB) CEMS G-19, Part III, Class 5 CRB. 12.0 RESTRICTED CHEMICAL SUBSTANCES: Effective January
15、 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the MPAPS B-50 specification. 13.0 METHOD OF DESIGNATION: Drive screws will be designated by nominal size, length, word description, material, finish, and part number as shown in the followi
16、ng example: 8 x 9.5 mm Drive Screw, CST, ZN6A, Part Number NUMBER: MPAPS S-DM-61.101-GS/PL TITLE: Round Head Metallic Drive Screws REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are
17、required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 3 of 3 14.0 WORKMANSHIP: Drive screws must be free from burrs, loose scale, and all other defects that might affect their serviceability. Dimensions in millimeters: Nominal Size Number of Thread Starts A B C D Recommended
18、 Thread Head Head Pilot Hole Size Diameter Diameter Height Diameter Drill Hole Max Min Max Min Max Min Max Min Size Diameter 0 6 1.9 1.83 3.22 3 1.24 1.04 1.6 1.52 51 1.7 2 8 2.54 2.46 4.11 3.71 1.75 1.5 2.11 2.03 44 2.18 4 7 2.95 2.84 5.36 4.9 2.18 1.9 2.44 2.34 37 2.64 6 7 3.56 3.45 6.6 6.1 2.62 2
19、31 2.95 2.84 31 3.05 7 8 3.91 3.81 7.24 6.7 2.82 2.51 3.2 3.1 29 3.45 8 8 4.24 4.11 7.85 7.29 3.05 2.72 3.45 3.35 27 3.66 10 8 4.62 4.5 9.12 8.48 3.48 3.12 3.81 3.71 20 4.09 12 8 5.38 5.23 10.36 9.7 3.89 3.53 4.5 4.39 11 4.85 14 9 6.15 6 11.61 10.9 4.32 3.94 5.13 5.03 2 5.61 L Length 3.1 4.8 6.35 7
20、9 9.5 12.7 E* Pilot Length For L 1.2 1.2 1.2 1.2 1.6 1.6 15.0 PART LIST: 15.1 Approved: Nominal Size Length Pilot LG Finish Material Part Number Mm In Mm In 0 3.2 1/8 1.2 .047 PLN CST 145362 0 4.8 3/16 1.2 .047 ZN6A CST 125622 0 6.4 1/4 1.2 .047 ZN6A CST 173639 2 6.4 1/4 1.2 .047 ZN6A CST 145371 4
21、8 5/16 1.2 .047 PLN CST 145374 6 6.4 1/4 1.2 .047 PLN CST 113231 6 6.4 1/4 1.2 .047 CRB CST 220349 16.0 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:/
