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 12 NAVISTAR, INC. Material, Parts, and Process Specifications
2、(MPAPS) NUMBER: MPAPS S-B-1.101-GS/PL Former Designation: ESP-B-1.101-GS TITLE: Hex Head Bolts English Series (Noun Code 0810) CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-B-1.101-GS - December 2012 PRINTED COPIES O
3、F 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 pract
4、ices and to determine the applicability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format; Combined GS, PP, NPP. 1.0 GENERAL: The Hex Head Bolts in this standard are the same as Finished Hex Head Bolts described in SAE J105 and ANSI B 18.2.1-1981 with Style 1 max/min radi
5、us fillet. The ANSI Standard is a consolidation of two former standards, “Hex Cap Screws“ and “Finished Hex Bolts.“ Sizes from 1/4 inch to 1-1/2 inch inclusive, are unified dimensionally with the British and Canadian Standards. NAVISTAR has retained the 1-14NF, now 1-14UNS, as standard for the 1 inc
6、h fine thread. 2.0 CONTENTS: Page General 1 Policy for Selecting Parts for New Design 2 Dimensions 2 Head 2 Point 2 Length Tolerance 3 Threads 3 Thread Length 3 Incomplete Thread Diameter 4 Body Diameter 4 Material and Physical Properties 4 Finishes 4 Restricted Chemical Substances 5 Head Marking 5
7、Requirements For Drilled (DRLD) Holes In Body 5 Straightness 5 Thread Runout and Straightness Sleeve Gages and Gaging 5 Straightness Gages and Gaging 6 Surface Discontinuities 7 Service Parts Substitution Policy 7 Part List 8 Technical Information 12 NUMBER: MPAPS S-B-1.101-GS/PL TITLE: Hex Head Bol
8、ts 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 of 12 3.0 POLICY FOR SELECTING PARTS FOR NEW DE
9、SIGN: Approved parts are so designated to reduce variety of parts and assure maximum availability, interchangeability, and cost savings in volume buying. For new design, parts shall be selected from “Approved“ part list only. Material and Finish: MPAPS F-31, Part I, Type 5; Zinc Trivalent with Seale
10、r (ZN8F) MPAPS F-31, Part I, Type 8; Phosphate Coated (PHC) Thread Pitch: Coarse Diameters: 1/4, 5/16, 3/8, 1/2, 5/8, 3/4, 1, 1-1/4, and 1-1/2 Lengths: All diameters - 1/4 inch increments thru 4 inches. 1/4 and 5/16 Diameters 1/2 inch Increments - 4 thru 7 inches 1 inch Increments - Over 7 inches 3/
11、8 thru 1-1/2 Diameters 1/2 inch Increments - 4 thru 9 inches 1 inch Increments - Over 9 inches All preferred lengths beyond the 7 and 9 inch ranges indicated above will be carried in the “Not for new Design” section because of limited usage. 4.0 DIMENSIONS: All dimensions in this standard are in inc
12、hes. 5.0 HEAD: Top of the head will be full form and chamfered or rounded with the diameter of chamfer circle or start of rounding being equal to the maximum width across flats within a tolerance of minus 15 percent. Bearing surface will be flat washer faced. Diameter of bearing surface will be equa
13、l to the maximum width across flats within a tolerance of minus 10 percent. Thickness of the washer face will not be less than .015 inch nor greater than .025 inch for bolt sizes 3/4 inch and smaller and not less than .015 inch nor greater than .035 inch for sizes larger than 3/4 inch. Wrenching hei
14、ght is a distance measured from the bearing surface up the side of the head at the corners. The width across corners will be within specified limits for the full wrenching height. The plane of the bearing surface will be perpendicular to the axis of the body within the FIM limits specified. Measurem
15、ent of FIM will be made as close to the periphery of the bearing surface as possible while the bolt is held in a collet or other gripping device at a distance of one bolt diameter from the underside of the head. The axis of the head will be located at true position with respect to the axis of the bo
16、dy (determined over a distance under the head equal to one diameter) within a tolerance zone whose diameter is equivalent to 6% of the maximum width across flats, regardless of feature size. 6.0 POINT: Point will be chamfered or rounded at manufacturers option from approximately .016 inch below the
17、minor diameter of the thread, the length of point to be from 1/2 to 1-1/2 threads. NUMBER: MPAPS S-B-1.101-GS/PL TITLE: 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
18、are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 3 of 12 7.0 LENGTH TOLERANCE: Bolts will be as tabulated below: Length Nominal Sizes 1/4 to 3/8 7/16 and 1/2 9/16 to 3/4 7/8 and 1 1-1/8 to 1-1/2 Up to 1 in, incl + .0, -.03 +.0, -.03 + .0. -.03 Over 1 in to 2-1/2 in,
19、 incl + .0, -.04 +.0, -.06 + .0, -.08 +.0, -.10 +.0, -.12 Over 2-1/2 in to 4 in, incl + .0, -.06 +.0, -.08 + .0, -.10 +.0, -.14 +.0, -.16 Over 4 in to 6 in, incl + .0, -.10 + .0, -.10 + .0, -.10 + .0, -.16 + .0, -.18 Longer than 6 in + .0, -.18 + .0, -.18 + .0, -.18 + .0, -.20 + .0, -.22 8.0 THREADS
20、: Threads will be Unified Series, Class 2A in accordance with American National Standard B-1.1. Threads, when rolled, will be Unified Inch coarse, fine, (UNRC or UNRF Series), Class 2A. Threads produced by other methods will preferably be UNRC or UNRF, but at manufacturers option, may be Unified Inc
21、h coarse, fine, (UNC or UNF Series), Class 2A. Acceptability of screw threads will be determined based on System 21, ANSI B1.3 Screw Thread Gaging Systems for Dimensional Acceptability. For threads with additive finish, the maximum diameter of Class 2A may be exceeded by the amount of the allowance;
22、 that is, the Class 2A maximum diameters apply to an unplated or uncoated part or to a part before plating or coating, whereas the basic diameters (Class 2A maximum diameters plus the allowance) apply to a part after plating or coating 9.0 THREAD LENGTH: The length of thread on bolts will be control
23、led by the grip gaging length LG max and body length LB min as set forth in the following: Grip gaging length LG max is the distance measured parallel to the axis of bolt from the underhead bearing surface to the face of a non-counterbored or non-countersunk standard GO thread ring gage assembled by
24、 hand as far as the thread will permit. It will be used as the criterion for inspection. The maximum grip gaging length, as calculated and rounded to two decimal places for any bolt not threaded full length, will be equal to the nominal bolt length minus the basic thread length (LG max = L nom LT).
25、For bolts which are threaded full length, LG max defines the unthreaded length under the head and will conform to the values listed in table below for the respective nominal bolt lengths, LG max represents the minimum design grip length of the bolt and will be used for determining thread availabilit
26、y when selecting bolt lengths even though usable threads may extend beyond this point. Basic thread length LT is a reference dimension, intended for calculation purposes only, which represents the distance from the extreme end of the bolt to the last complete (full form) thread. Basic thread length
27、equals twice the basic thread diameter plus 0.25 in. for nominal bolt lengths up to and including 6 in., and twice the basic thread diameter plus 0.50 in. for nominal lengths over 6 in. Body length LB min is the distance measured parallel to the axis of bolt from the underhead bearing surface to the
28、 last scratch of thread or to the top of the extrusion angle. It will be used as a criterion for inspection. The minimum body length as calculated and rounded to two decimal places will be equal to the maximum grip gaging length minus the maximum transition thread length (LB min = LG max - Y max). B
29、olts of nominal lengths which have a calculated LB min length equal to or shorter than the length of 2.5 times the coarse thread (UNC) pitch (see nominal lengths listed in the fifth column of table on page 4) will be threaded for full length. The distance from underhead bearing surface to the last s
30、cratch of thread will not be less than LB max. NUMBER: MPAPS S-B-1.101-GS/PL TITLE: 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 li
31、ability. 2015 by Navistar, Inc. JUNE 2015 Page 4 of 12 Transition thread length Y is a reference dimension equal to five coarse (UNC) pitches intended for calculation purposes only, which includes the length of incomplete threads, the extrusion angle on rolled threads, and tolerances on grip length.
32、 LIMITATIONS FOR PRODUCTS THREADED FULL LENGTH Dimensions in inches: Unthreaded Length Under Head Nominal Size For Nominal Product Lengths (1) LG Max (2) For Nominal Product Lengths LG Max (3) Than All Thread Series Than Than Course (UNC) Thd Fine (UNF) Thd 1/4 1/2 0.075 1/2 1.125 0.125 0.089 5/16 5
33、/8 0.083 5/8 1.375 0.139 0.104 3/8 3/4 0.094 3/4 1.500 0.156 0.104 7/16 7/8 0.107 7/8 1.750 0.179 0.125 1/2 1 0.115 1 1.875 0.192 0.125 9/16 1-1/8 0.125 1 1/8 2.000 0.208 0.139 5/8 1-1/4 0.136 1 1/4 2.250 0.227 0.139 3/4 1-1/2 0.150 1 1/2 2.250 0.250 0.156 7/8 . . . 2.875 0.278 0.179 1 . . . 3.250 0
34、.312 0.208 1-1/8 . . . 3.625 0.357 0.208 1-1/4 . . . 3.875 0.357 0.208 1-3/8 . . . 4.250 0.417 0.208 1-1/2 . . . 4.500 0.417 0.208 NOTES: (1) Tabulated values are equal to 2 times the basic product diameter. (2) Tabulated values are equal to 1.5 times the coarse thread (UNC) pitch. (3) Tabulated val
35、ues are equal to 2.5 times the thread pitch. 10.0 INCOMPLETE THREAD DIAMETER: The major diameter of incomplete threads will not exceed the actual major diameter of full form threads. 11.0 BODY DIAMETER: The diameter of body over the LB minimum length will conform to the limits for E given in table o
36、n page 7. On screws threaded for full length, the diameter of the unthreaded shank will not exceed the tabulated E max body diameter nor be less than the specified minimum pitch diameter of the thread. 12.0 MATERIAL AND PHYSICAL PROPERTIES: NAVISTAR Types 1, 5 and 8 in accordance with MPAPS F-31, Pa
37、rt I. Stainless steel will be SST-304 or SST-410 as specified per MPAPS A-37. 13.0 FINISHES: Bolts will be furnished plain, plated or coated in accordance with Material Part And Process Specification (MPAPS) Phosphate Coating (PHC) MPAPS G-1, Class B2. Zinc Trivalent with Sealer (ZN8F) 24 threads pe
38、r inch and coarser, MPAPS G-20, Class 8F. Chromium Bright (CRB) 12 threads per inch and coarser, MPAPS G-19, Class 8. 24 to 13 threads per inch, MPAPS G-19, Class 5. 28 threads per inch and finer, MPAPS G-19, Class 3. Zinc Aluminum Clear (ZACLR) Per MPAPS G-4518, Type 1. NUMBER: MPAPS S-B-1.101-GS/P
39、L TITLE: 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 5 of 12 14.0 RESTRICTED CHEM
40、ICAL SUBSTANCES: Effective January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the MPAPS B-50 specification. 15.0 HEAD MARKING: Bolts will have legible, raised radial head markings to indicate bolt type (see MPAPS F-31, Part I), and a
41、manufacturers identification symbol recognizable in the trade to indicate source. Marking symbols on the heads for bolt sizes 5/8 inch and smaller will project not less than .005 inch above surface nor more than .015 inch over the specified maximum head height: and for bolt sizes larger than 5/8 inc
42、h will project not less than the equivalent in inches of .0075 times the basic bolt diameter above the surface nor more than .030 inch over the specified maximum head height. 16.0 REQUIREMENTS FOR DRILLED (DRLD) HOLES IN BODY: * Drilled holes are to be located from under the head at a distance equal
43、 to nominal C minus N. 17.0 STRAIGHTNESS: Shanks Of bolts will be straight within the following limits: for bolts with nominal lengths to and including 12 inches the maximum camber will be .006 inch per inch of bolt length, and for bolts with nominal lengths over 12 inches to and including 24 inches
44、, the maximum camber will be .008 inch per inch of length. 18.0 THREAD RUNOUT AND STRAIGHTNESS SLEEVE GAGES AND GAGING (for lengths 10 inch and shorter): Gages capable of simultaneously checking thread runout and bolt straightness are illustrated below for all bolts with lengths 10 inch and shorter.
45、 Both constructions can accommodate different lengths of bolts through the combination of various lengths of sleeves to build up the required length L. When two or more sections are combined, care must be exercised to assure accurate alignment of the internal hole. In the right hand construction, th
46、read ring gage A is centered on the sleeve B by means of positioning plug E and is secured in position by attachment bolts C. The ring gage is set to class 2B maximum pitch diameter by use of the positioning plug E. The maximum length of the sleeve gage B for any diameter and length of bolt will be
47、9 in. The hole diameter of the sleeve will be the nominal screw diameter plus .031 inch when inspecting bolts of sizes 3/4 in. and smaller with lengths 6 in. and shorter; and plus .062 inch when inspecting bolts of larger sizes and/or longer lengths. To insure adequate service life, gages and sleeve
48、 sections should be suitably hardened. Failure of the product to enter the threads of the gage freely by hand for a minimum of two complete threads indicates excessive thread runout and/or out-of-straightness. Dimensions in inches: A N* G Cotter Pin Size 1/4 .109 .078 1/16 5/16 .125 .078 1/16 3/8 .1
49、56 .125 3/32 7/16 .156 .125 3/32 1/2 .172 .125 3/32 5/8 .188 .156 1/8 3/4 .219 .156 1/8 7/8 .250 .156 1/8 1 .250 .156 1/8 NUMBER: MPAPS S-B-1.101-GS/PL TITLE: 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 6 of 12 A - Thread ring gage set to Class 2B max pitch diameter. B - Sleeve
