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 7 NAVISTAR, INC. Material, Parts, and Process Specifications
2、(MPAPS) NUMBER: MPAPS S-JM-6.101-GS/PL Former Designation: ESP-JM-6.101-GS TITLE: Spring Pins - Metric Series (Noun Code - 6200) CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-JM-6.101-GS - August 2006 PRINTED COPIES
3、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 safety and health prac
4、tices and to determine the applicability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format; Combined GS, GI, NPP. 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 supplementa
5、l group instructions in regard to use of metric standards that should be taken into account. This standard may differ in some respects with certain segments of the ISO and national standards. In recognition of these possible differences, the sizes and tolerance ranges used were established in an eff
6、ort to enable the use of commercially available items, dimensionally interchangeable worldwide. The inclusion of dimensional data is not intended to imply that all the pins described are stock production sizes. Inch dimensioned standard pins may be found in MPAPS S-J-6.101-GS/PL. 2.0 CONTENTS: Page
7、General 1 Design Consideration 2 Metric-Inch Related Sizes 2 Color Coding 3 Method of Designation 3 Policy for Selecting Parts for New Design 3 Types and Series 4 Length Tolerance 4 Slot 4 Straightness 4 Material and Hardness 4 Performance 5 Finishes 5 Restricted Chemical Substances 6 NUMBER: MPAPS
8、S-JM-6.101-GS/PL TITLE: Spring Pins - Metric Series 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
9、2 of 7 3.0 DESIGN CONSIDERATION: Spring pins provide a low-cost and effective method of assembly where the loads imposed on the fastener are principally in shear. Design conditions which impose a vibration component in a direction parallel to the axis of the pin should be avoided. If the final assem
10、bly will be subjected to vibrations, testing of prototype assemblies is recommended. The selection of a pin size, its length and its location should be based on a careful analysis of the shear loads. The shear plane of the pin should be located at a minimum distance of one diameter from the end of t
11、he pin to prevent any premature failure. In many assemblies, it is desirable that the pin fail before the shafts or couplings with which they are being used. In soft metals, ultimate failure may depend more upon the strength of the hole material than upon shear strength of the spring pin. Under incr
12、eased load, hole edges are deformed by compressive forces. The effect of gap orientation on slotted spring pin shear strength is that random slot positioning is satisfactory for all but the most extreme slotted spring pin applications. For special applications maximum shear strength is assured by in
13、serting the slotted spring pin so the gap is in line with the direction of the load. Spring pins can usually be operated satisfactorily in excess of the permissible operating temperatures of the members in which they are inserted. However, for special applications the following values may be taken a
14、s safe limits before the physical properties of the spring pins are substantially altered. Carbon Steel 260C. Type 420 Corrosion Resistant Steel 371C 4.0 METRIC-INCH RELATED SIZES: During the inch to metric design transition period, the following chart of related sizes can be used for reference. Thi
15、s information is not to be considered as a recommendation for substitutions but only as a means of determining approximate dimensional equivalents. Metric Series Inch Series (mm) Approximate 2 1/16, 3/32 3 1/8 4 5/32 5 3/16 6 1/4 8 5/16 10 3/8, 7/16 12 1/2 Page Workmanship 6 Dimension 6 Part List 6
16、Technical Information 7 NUMBER: MPAPS S-JM-6.101-GS/PL TITLE: Spring Pins - Metric Series 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.
17、2015 by Navistar, Inc. JUNE 2015 Page 3 of 7 5.0 COLOR CODING: Not recommended, except in cases where adequate insurance is needed to prevent mixing of “metric parts” with look-alike “inch parts”. The color blue is standard identifier used in some industries. This must be handled internally at indiv
18、idual plants where needed and is meant to be supplemental to the normal finish and easily deleted when the need for supplemental identification no longer exists. The supplemental blue color should not be used on finishes such as chromium bright which are specified for cosmetic purposes, or phosphate
19、 coating which causes a loss of color identity. 6.0 METHOD OF DESIGNATION: Spring pins will be designated on purchase orders by size, length, word description, finish, material, and part number as follows: 8 x 10 mm, Slotted Spring Pin, Heavy, Plain, HTS, Part Number 10 x 24 mm. Coiled Spring Pin, H
20、eavy, Plain. HTS, Part Number 7.0 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. Types: Coiled, Heavy
21、 Series Material: Carbon Spring Steel (HTS) Finish: Plain (PLN) Nominal Sizes and Length Incrementation: Dimensions in millimeters: Standard Nominal Pin Size Lengths 2 3 4 5 6 8 10 12 16* 4 x 6 x 8 x x 10 x x x 12 x x x x 14 x x x x x 16 x x x x x 18 x x x x x x 20 x x x x x x 22 x x x x x x x 24 x
22、x x x x x x 26 x x x x x x x x 28 x x x x x x x x 30 x x x x x x x 32 x x x x x x x 36 x x x x x x x 40 x x x x x x x x 45 x x x x x x x 50 x x x x x x x 55 x x x x x x 60 x x x x x x 65 x x x x x 70 x x x x x 75 x x x x x 80 x x x x 85 x x x x 90 x x x x 95 x x x x 100 x x x x * Coiled Springs Only
23、 NUMBER: MPAPS S-JM-6.101-GS/PL TITLE: Spring Pins - Metric Series 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.
24、JUNE 2015 Page 4 of 7 8.0 TYPES AND SERIES: Spring pins are available in two types, slotted and coiled. The coiled type has a heavy and a medium duty series. Slotted Heavy Duty Series: (Non preferred) For high static shear loads in higher strength materials. Coiled Heavy Duty Series: For high static
25、 shear loads in higher strength materials. Medium or Standard Duty: For medium static shear loads with higher shock vibration loads, in materials of moderate strength. 9.0 LENGTH TOLERANCE: Dimensions in millimeters: Length Range Up to and Including 10 mm Long Over 10 mm Long Up To and Including 50
26、mm Long Over 50 mm Long Tolerance +0.5 mm +1 mm +1.5 mm on Length 0 0 0 10.0 SLOT: (For slotted spring pins only.) Slot design will be in accordance with the practice of the manufacturer, except that the slot width will be narrow enough to prevent nesting or interlocking of pins and wide enough to p
27、ermit satisfactory installation in a hole of the minimum diameter as recommended in the dimensional table. 11.0 STRAIGHTNESS: Straightness of pins will be within the limits necessary to permit pins to fall through a ring gage by their own weight. Ring gage dimensions will be as specified below: STRA
28、IGHTNESS LIMITS Dimensions in millimeters: Pin Length Gage Gage Hole Length Diameter Max Min Min Max Specified Specified Pin Dia, Max Pin Dia, Max plus plus To and Incl 25 25.15 24.85 0.20 0.21 Over 25 to 50 50.15 49.85 0.40 0.42 Over 50 75.15 74.85 0.60 0.63 12.0 MATERIAL AND HARDNESS: Hardness wil
29、l be tested in the following manner: For slotted pins, the readings will be taken near the center of a longitudinal flat ground on the pin at right angles to the slot. Coiled pins will be ground or cut in half along the longitudinal axis and the hardness readings will be taken on the inside surface
30、of the outer half coil. Table following designates materials and the proper Rockwell scale to be used for the various wall thickness ranges. Dimensions in millimeters: Wall Thickness Range Up To 0.25 mm Over 0.25 mm Up to 0.63 mm Over 0.63 mm Up to 1.27 mm Over 1.27 mm Up to 2.39 mm Hardness Scale D
31、PH (10 Kg) Rockwell 15N Rockwell A Rockwell C Material SAE 1070 - 1095 Carbon Steel. Per CEMS A-0, Part 1, Section B, Group 14B 458 - 562 83.6 - 87 73.6 - 78 46 - 53 AISI 420 Stainless Steel (SST) 413 - 545 82 - 86.6 72 - 77 43 - 52 NUMBER: MPAPS S-JM-6.101-GS/PL TITLE: Spring Pins - Metric Series R
32、EVISION: 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 7 13.0 PERFORMANCE: Spring pins will assemble an
33、d disassemble with light to moderate force when used with the recommended hole sizes without significant deformation to either pins or holes. Assembled pins will withstand the minimum double shear loads as specified in the dimensional tables. Spring pins will withstand the minimum double shear loads
34、 specified in the dimensional tables when tested in accordance with the following procedure: The shear test will be performed in a fixture in which the pin support members and the member for applying the load will have holes of a diameter conforming to the recommended hole size for the pins being te
35、sted and will have a Rockwell hardness of C58 or equivalent. The clearance between the supporting members and the loading member will not exceed 0.1 mm and the shear plane will be at least one diameter away from each end of the pin. Pins will be located so that the slot is approximately at right ang
36、les to the line of application of the load. The speed of load application will not exceed 12 mm per minute. Pins too short to be tested in double shear will be tested by shearing two pins simultaneously in single shear. Spring pins which have been tested for shear strength will show a ductile shear
37、without longitudinal cracks. Typical spring pin shear test fixtures are illustrated below: 14.0 FINISHES: Spring pins will be supplied plain, plated, or coated in accordance with the MPAPS and class listed below: Zinc Trivalent, Class 6A (ZN6A) MPAPS G-20, Class 6A Phosphate Coating (PHC) MPAPS G-1,
38、 Class B-2 High tensile strength steel components such as spring pins are more susceptible to embrittlement by hydrogen. Therefore, electroplating is not recommended for these products. However, if NUMBER: MPAPS S-JM-6.101-GS/PL TITLE: Spring Pins - Metric Series REVISION: 1506 This document is rest
39、ricted 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 6 of 7 chemical or electrochemical surface coating cannot be avoided, the plated spring
40、pin must be heated at a temperature sufficiently high and for a period sufficiently long to remove the hydrogen. 15.0 RESTRICTED CHEMICAL SUBSTANCES: Effective January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the MPAPS B-50 specific
41、ation. 16.0 WORKMANSHIP: Spring pins will be free from burrs, loose scale, seams, notches, sharp edges, or other defects which might affect their serviceability. 17.0 DIMENSIONS: Dimensions in millimeters: Nominal Size 2 3 4 5 6 8 10 12 A Diameter, Max * 2.20 3.25 4.28 5.33 6.36 8.40 10.43 12.48 Dia
42、meter, Min * 2.12 3.15 4.15 5.17 6.2 8.22 10.25 12.28 B Chamfer Diameter, Max 1.9 2.9 3.9 4.8 5.8 7.8 9.7 11.7 C Chamfer Length, Max 0.8 1 1.2 1.4 1.6 2 2.4 2.8 Min 0.2 0.2 0.3 0.3 0.4 0.4 0.5 0.6 D Stock Thickness, Nom 0.4 0.6 0.8 1 1.2 1.6 2 2.5 Min 2 3 4 5 6 8 10 12 Recomd Hole Size, (Note) Max 2
43、.07 3.1 4.1 5.12 6.13 8.15 10.15 12.18 Min Double Shear (kN) 3 7.1 13.2 20.2 29.2 52.8 84 106 * Maximum diameter will be checked by “GO“ Ring Gages. * Minimum diameter of slotted pin types will be the average of the A1, A2, and A3 diameters. NOTE: Recommended hole sizes shown are North American indu
44、stry practice and are published as a guide only. Because conditions differ widely, it may be necessary to modify the hole size to suit a particular application. The advisability and the extent of such modifications can best be determined by experiment in the particular assembly environment. 18.0 PAR
45、T LIST: 18.1 Approved: Nominal Size Length Series Finish Material Part Number 4 24 HVY PLN HTS 30892R1 NUMBER: MPAPS S-JM-6.101-GS/PL TITLE: Spring Pins - Metric Series REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corpora
46、te Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 7 of 7 19.0 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:/
