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 8 NAVISTAR, INC. Material, Parts, and Process Specifications (
2、MPAPS) NUMBER: MPAPS S-BM-11.101-GS/PL Former Designation: ESP-BM-11.101-GS TITLE: Round Head Short Square Neck (Carriage) 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-11.10
3、1-GS - August 2006 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
4、appropriate safety and health practices and to determine the applicability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format; Combined GS, GI, PP. 1.0 GENERAL: This standard is based on, and contains elements of, the following standard: American National Standard: ANSI B
5、18.5.2.1 M Bolts in this standard approximate the neck (depth of square) dimensions of the inch Short Square Neck Carriage Bolts per ANSI B18.5 and intended primarily for applications in thin metals. This standard is essentially the same as latest proposed American National Standard covering Metric
6、Round Head Short Square Neck Bolts. The inclusion of dimensional data is not intended to imply that all the bolts described are stock production sizes. Inch dimensioned standard bolts may be found in MPAPS S-B-10.101-GS/PL. Letter symbols designating dimensional characteristics are in accord with th
7、ose used in ANSI and ISO standards. 2.0 CONTENTS: Page General 1 Design Consideration 2 Metric-Inch Related Sizes 2 Threads 2 Thread Tolerances 3 Thread Length Formula 3 Property Class 3 Hardness comparison 3 Color Coding 3 Method of Designation 3 Policy for Selecting Parts for New Design 4 Head 4 N
8、UMBER: MPAPS S-BM-11.101-GS/PL TITLE: Round Head Short Square Neck (Carriage) 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 b
9、y Navistar, Inc. JUNE 2015 Page 2 of 8 3.0 DESIGN CONSIDERATION: Where Class 9.8 material is specified as acceptable option to 8.8, the design must be to the 8.8 strength level. Class 9.8 is acceptable to assure maximum material availability in North America. Designing to Class 8.8 assures material
10、availability and interchangeability worldwide. Coarse thread series only will be considered as part of this standard, because of the following advantages: Less tendency to cross thread. Resists nicking and has less stress concentration at the thread roots. Less likely to be seriously affected by dec
11、arburization 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 sizes can be used for reference. This information is not to be considered as a recommendation for substitutions but only as
12、a means of determining approximate dimensional equivalents. Metric Series mm Approximate Inch Series 6 1/4 8 5/16 10 3/8 12 1/2 16 9/16, 5/8 20 3/4 5.0 THREADS: The ISO basic profile is essentially the same geometric configuration as the unified screw thread basic form. The threads will be coarse se
13、ries, tolerance class 6g (Ext). Page Head Periphery 4 Bearing Surface 4 Depth of Square Neck 5 Corner Depth 5 Corner Fill 5 Fillet 5 Body Diameter 5 Length 5 Straightness 5 Thread Length 5 Thread Series 7 Material Restricted Chemical Substances Identification Symbols 7 7 7 Requirements For Drilled H
14、oles In Body 7 Workmanship 8 Part List 8 Technical Information 8 NUMBER: MPAPS S-BM-11.101-GS/PL TITLE: Round Head Short Square Neck (Carriage) Bolts REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standa
15、rds. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 3 of 8 6.0 THREAD TOLERANCES: The ISO medium class of fit 6H(Int)/6g(Ext) is approximately the same as the 2A/2B allowance in the U.S. unified thread series for comparable size. For example: Thread Allo
16、wance M10 x 1.5 - 6H(Int)/6g(Ext) 0.032 mm (.00126 in) 3/8-16 UNC 2A(Ext)/2B(Int) .0013 in (0.033 mm) 7.0 THREAD LENGTH FORMULA: The thread lengths shown on Table 2 are based on the formulas shown below: Millimeters Nominal Length Formula for Thread Length Over To - 125 2d + 6 125 200 2d + 12 200 -
17、2d + 25 d = Nominal Diameter of the Bolt 8.0 PROPERTY CLASS: The property class designation symbol for steel bolts consists of two parts, the first is approximately one-hundredth of the minimum tensile in megapascals (MPa) * and the second is one-tenth of the ratio between the minimum yield stress a
18、nd the minimum tensile strength, expressed as a percentage. The multiplication of the figures will approximate 1/10 the minimum yield stress in megapascals (MPa). * 1 MPa = 1 N/mm2 9.0 HARDNESS COMPARISON: CORE HARDNESS ISO* Navistar* ISO* Class 8.8 Type 5 Class 9.8* Min (Rockwell) C23 C25 C27 Max (
19、Rockwell) C34 C34 C36 Range (Min to Max) 11 9 11 * For sizes 1/4 thru 1 inch. * Acceptable optional material for 8.8 design, sizes 6 mm thru 16 mm. * Hardness figures are those shown in ISO 898/1. 10.0 COLOR CODING: Not Recommended, except in cases where adequate insurance is needed to prevent mixin
20、g of “metric parts“ with look-alike “inch parts.“ The color blue is the standard identifier used in some industries (Automotive, etc.). This must be handled internally at individual plants where needed and is meant to be a supplemental to the normal finish and easily deleted when the need for supple
21、mental 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 coating which may cause a loss of color identity. 11.0 METHOD OF DESIGNATION: Round head short square neck bolts are desig
22、nated by the following data, preferably in the sequence shown: product name, nominal diameter, nominal length, steel property class or material identification special feature, if any, finish and part number as shown in the following examples: NUMBER: MPAPS S-BM-11.101-GS/PL TITLE: Round Head Short S
23、quare Neck (Carriage) 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 8 Round head short
24、square neck bolt, M10 x 50, class 9.8, ZND, Part Number. Round head short square neck bolt, M6 x 60, class 9.8, Drilled, ZND, Part Number. NOTE: It is common practice in ISO standards to omit thread pitch from the product size designation when screw threads are the metric coarse thread series, e.g.,
25、 M10 is M10 x 1.5. 12.0 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. Material: Classes 8.8 or 9.8 (A
26、cceptable Optional Material, Sizes 6 thru 16 mm) Finish: Zinc Trivalent with Sealer (ZN8F) Dimensions in millimeters: Nominal Diameters Lengths M6 M8 M10 M12 M16 M20 12 X 14 X X 16 X X 20 X X X X 25 X X X X 30 X X X X X 35 X X X X X X 40 X X X X X X 45 X X X X X X 50 X X X X X X 55 X X X X X X 60 X
27、X X X X X 65 X X X X X 70 X X X X X 80 X X X X X 90 X X X X 100 X X X X 110 X X X 120 X X X 130 X X 140 X X 150 X X 160 X X 180 X 200 X 2 mm increments under 12 mm 20 mm increments over 180 mm 13.0 HEAD: The height of head will be measured, parallel to the axis of the bolt, from the top of the head
28、to the under head bearing surface. The spherical top surface of the head may be under filled within a circle equal to the nominal bolt diameter, D, concentric to the bolt axis providing the height of head, K, is maintained. 14.0 HEAD PERIPHERY: The head periphery will be round within the specified m
29、aximum head diameter, Dc, and the minimum bearing surface diameter, Dw, and may be somewhat irregular. The edge may be rounded or flat, providing the limits C, head edge thickness, Dc, head diameter, and Dw, bearing surface diameter are maintained. 15.0 BEARING SURFACE: The bearing surface will be r
30、easonably flat and perpendicular to the axis of the bolt. However, a 0.5 mm maximum die seam fin across the bearing surface will be permissible. Nominal Sizes and within 0.008 mm/mm of bolt length for bolts having nominal lengths over 300 mm. The referee gage and gaging procedure for checking bolt s
31、traightness is given in Table 1. 23.0 THREAD LENGTH: The length of thread on bolts will be controlled by the maximum grip gaging length (Lg) and the minimum body length (Ls) as set forth below: Grip gaging length, (Lg) max, is the distance measured parallel to the axis of the bolt, from the under he
32、ad bearing surface to the face of a non-counterbored or non-countersunk standard GO thread ring gage assembled by hand as far as the thread will permit. For standard diameter length combinations of bolts, the values for Lg max are specified in Table 1. For diameter length combinations not listed in
33、Table 1, the maximum grip gaging length, as calculated and rounded to NUMBER: MPAPS S-BM-11.101-GS/PL TITLE: Round Head Short Square Neck (Carriage) Bolts REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical S
34、tandards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 6 of 8 one decimal place, will be equal to the nominal bolt length, L, minus the basic thread length, B, as specified in Table 2 (Lg max = L - B). Lg max will be used as a criterion for inspection.
35、 Body length, Ls min, is the distance, measured parallel to the axis of the bolt, from .the under the head bearing surface to the last scratch of thread or top of the extrusion angle, whichever is closest to the head. For standard diameter length combinations of bolts, the values of Ls min are speci
36、fied in Table 1. For diameter length combinations not listed in Table 1, the minimum body length, as calculated and rounded to one decimal place, will be equal to the maximum grip gaging length as computed minus the maximum transition thread length as specified in Table 2 (Ls min = Lg. max - X max).
37、 Ls min will be used as a criterion for inspection. Bolts of nominal lengths equal to or shorter than L 1, specified in Table 2, will be threaded full length. For bolts which are threaded full length, Lg. max will be as specified in Table 2. Basic thread length, B, as specified in Table 2 is a refer
38、ence dimension intended for calculation purposes only, and is the distance, measured parallel to the axis of the bolt, from the extreme end of the bolt to the last complete (full form) thread. Transition thread length, X max, as specified in Table 2 is a reference dimension intended for calculation
39、purposes only. It includes the length of incomplete threads and tolerances on grip gaging length and body length. The transition from full thread to incomplete threads will be smooth and uniform. The major diameter of the incomplete threads will not exceed the actual major diameter of the complete (
40、full form) threads. For bolts of property class 10.9 and higher strength materials (tensile strength 1040 MPa and higher), the transition threads will have a rounded root contour no radius of which will be less than the specified minimum radius at the root of the full form thread. TABLE 1 MAXIMUM GR
41、IP GAGING LENGTHS AND MINIMUM BODY LENGTHS Dimensions in millimeters: Nominal Dia Ls is body length. 2. Diameter-length combinations between the dashed lines are recommended. Lengths in parentheses are non-preferred. Standard lengths over 200 mm are in 20 mm increments. 3. Bolts with lengths above t
42、he heavy solid line are threaded full length. 4. For bolts with lengths not showing or below the lower dashed line, see grip gaging length formula. TABLE 2 THREAD LENGTHS Nominal Bolt Diameter and Thread Pitch B (Ref) X (Ref) Bolts Threaded Full Length Thread Length, Basic Transition Thread Length M
43、ax L1 Bolt Lengths To and Incl. Lg Grip Gaging Length Max Bolt Lengths 125 and 200 M6 x 1 18 24 37 5.0 50 5.0 M8 x 1.25 22 28 41 6.2 50 5.5 M10 x 1.5 26 32 45 7.5 50 7.0 M12 x 1.75 30 36 49 8.8 50 7.5 M16 x 2 38 44 57 10.0 60 9.0 M20 x 2.5 46 52 65 12.5 70 10.0 24.0 THREAD SERIES: Threads will be me
44、tric coarse thread series conforming to dimensions for general purpose external threads given in NAVISTAR EM15 and ANSI B 1.13. The class 6g tolerance will apply to plain finish (unplated or uncoated) bolts, and to plated or coated bolts before plating or coating. For bolts with additive finish, the
45、 6g diameters may be exceeded by the amount of the allowance, i.e., the basic diameters will apply to screws after plating or coating. 25.0 MATERIAL: Classes 8.8 or 9.8 (acceptable alternate material for 8.8 design, sizes 6 mm thru 16 mm) per MPAPS F-31. 26.0 RESTRICTED CHEMICAL SUBSTANCES: Effectiv
46、e January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the MPAPS B-50 specification. 27.0 IDENTIFICATION SYMBOLS: Steel bolts will be marked with the property class symbol and with the manufacturers identification symbol. Minimum height
47、 (top and bottom) of property class symbols will be 1.5 mm for bolt sizes M6, 2.3 mm for M8 and M 10 bolts, 3.2 mm for M 12, and 4.0 mm for M16 and larger bolts. Markings will be located on the top of the head and may be raised or indented unless otherwise agreed upon by the manufacturer and purchas
48、er. The total head height (head plus markings) will not exceed the specified maximum head height plus 0.1 mm for M6 bolts, 0.2 mm for M8 and M10 bolts, 0.3 mm for M12, and 0.4 mm for M16 and larger bolts. 28.0 REQUIREMENTS FOR DRILLED HOLES (DRLD) IN BODY: (Non-Preferred) * Drilled holes are to be located under the head a distance equal to nominal L minus J. A J* K 6 3 1.6 8 3.3 2 10 4.2 2.5 12 5 3.2 16 6 4 20 6.5 4 24 8.5 5 NUMBER: MPAPS S-BM-11.101-GS/
