NAVISTAR MPAPS S-C-29 101-GS PL-2015 Flanged 12- Point Screws C English Series (Noun Code 7450).pdf

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-C-29.101-GS/PL Former Designation: ESP-C-29.101-GS TITLE: Flanged 12- Point Screws English Series (Noun Code 7450) CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-C-29.101-GS - February 2011 PRIN

3、TED 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 safety and

4、health practices 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: This standard conforms essentially with the SAE J58 Standard for Flanged 12-Point Screws, with the notable exception of material. 2.0

5、CONTENTS: Page General 1 Policy for Selecting Parts for New Design 2 Service Parts Substitution Policy 2 Top of Head 2 Corner Fill 2 Wrenching Height 2 Bearing Surface 2 Length 2 Body Diameter 3 Threads 3 Length of Thread 3 Thread Runout and Bow of Shank 4 Material 5 Finishes 5 Restricted Chemical S

6、ubstances 5 Surface Discontinuities 5 Part List 6 Technical Information 7 NUMBER: MPAPS S-C-29.101-GS/PL TITLE: Flanged 12 Point Screws REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers

7、 are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 2 of 7 3.0 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 in volume buying. For new design,

8、 parts shall be selected from “Approved“ part list only. Finishes: Phosphate Coated (PHC) Material: Navistar Type 9 Threads: Unified 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 inches. 1/4 and 5/16 diameters 1/2 inch incremen

9、ts - 4 thru 7 inches 1 inch increments - over 7 inches 3/8 thru 1-1/2 diameters 1/2 inch increments - 4 thru 9 inches 1 inch increments - over 9 inches 4.0 SERVICE PARTS SUBSTITUTION POLICY: In the event that engineering does not indicate a “Do not substitute“ in engineering specifications, the foll

10、owing substitutions may be implemented in service. This policy is the result of a proposal circulated April 20, 1981, and subsequently approved by engineering departments worldwide. Flanged 12-Point Screws To Be Replaced Service Replacement Plain (PLN) Finish Phosphate Coated (PHC) Finish 5.0 TOP OF

11、 HEAD: The top of head may be full form or indented at the option of the manufacturer. If full form, the top of head will be chamfered or rounded with the diameter of chamfer circle or start of rounding being equal to the specified maximum width across flats within a tolerance of -15%. If the top of

12、 head is indented, the periphery may be rounded. 6.0 CORNER FILL: The rounding due to lack of fill at all 12 corners of the head will be reasonably uniform and the width across corners of the head be such that when a sharp ring, having an inside diameter equal to the “T“ dimension and a thickness wi

13、thin the limits for “A“ specified in dimensional table, is placed on the top of the head, normal to the screw axis, the head may enter but will not protrude through the gage. 7.0 WRENCHING HEIGHT: The wrenching height will be measured, parallel to the axis of screw, from the intersection of the top

14、contour of flange with any corner of head to the top of the head. 8.0 BEARING SURFACE: The outer periphery may be rounded or chamfered to the extent permitted by “X,“ as measured on the bearing face. The plane of the bearing face will be perpendicular to the axis of screw within the runout limit spe

15、cified in dimensional table. Measurement of runout will be made as close to the periphery of bearing face as possible while the screw is held in a collet or other gripping device at a distance equal to one screw diameter from the underside of the head. 9.0 LENGTH: The length of the screw (L) will be

16、 measured on a line parallel to the axis, from the plane of the bearing surface under the head, to the plane of the flat of the point. The tolerances for length are as follows: NUMBER: MPAPS S-C-29.101-GS/PL TITLE: Flanged 12 Point Screws REVISION: 1506 This document is restricted and may not be sen

17、t 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 3 of 7 Nominal Screw Size 0 thru 3/8 7/16 thru 3/4 7/8 thru 1-1/2 Nominal Screw Length, in Tolerance on Length Up

18、 to 1, incl -.03 -.03 -.05 Over 1 to 2-1/2, incl -.04 -.06 -.10 Over 2-1/2 to 6, incl -.06 -.08 -.14 Over 6 -.12 -.12 -.20 10.0 BODY DIAMETER: On screws threaded full length, the diameter of the screw under the head will not be less than the specified minimum pitch diameter of the thread. 11.0 THREA

19、DS: Unified coarse or fine series (UNC or UNF), Class 3A limits will apply. 12.0 LENGTH OF THREAD: The length of thread on screws will be controlled by grip length LG max and the body length LB min as set forth in the following: 12.1 Grip Gaging Length - LG max is the distance, measured parallel to

20、the axis of screw, from the underside of head to the face of a noncounterbored or nonchamfered standard GO thread ring gage assembled by hand as far as the thread will permit. It represents the minimum design grip length and will be used as the criterion for inspection and for determining thread ava

21、ilability when selecting screw lengths even though usable threads may extend beyond this point. Values for LG max applicable to common nominal screw lengths are shown in Table 1. For screws having nominal lengths which fall between those tabulated in Table 1, the LG max value shown for the next shor

22、ter tabulated nominal length and respective screw size will apply. For screws having nominal lengths longer than those specified in Table 1 for the respective screw size, the LG max value will be determined by subtracting the LT value from the nominal screw length. For screws having shorter nominal

23、lengths than those specified in Table 1 for the respective screw size, the complete (full form) thread, as measured with a thread ring gage, will extend to within two threads (pitches) of the bearing face for sizes up to and including 5/8 in, and as close to the head as practicable for larger sizes.

24、 12.2 Body Length - LB min is the distance, measured parallel to the axis of screw, from the underside of the head to the last scratch of thread or the top of extrusion angle. The minimum body length for any screw length will be equal to the maximum grip length minus the transition thread length (LB

25、 min = LG max - Y max). It will be used as a criterion for inspection. 12.3 Basic Thread Length - LT is a reference dimension, intended for calculation purposes only, which represents the distance from the extreme end of the screw to the last complete (full form) thread. 12.4 Transition Thread Lengt

26、h - Y max is a reference dimension, interviewed for calculation purposes only, which represents the length of incomplete threads and the tolerance on grip length. 12.5 Point - The point will be flat and chamfered from a diameter approximately .016 inch below the minor diameter of thread to produce a

27、 length of point equivalent to 1/2 to 1-1/2 threads (pitches). 12.6 Incomplete Thread Diameter - The major diameter of incomplete thread will not exceed the actual major diameter of the full form thread. NUMBER: MPAPS S-C-29.101-GS/PL TITLE: Flanged 12 Point Screws REVISION: 1506 This document is re

28、stricted 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 7 12.7 Thread Runout - The total runout between thread, body, and head of screws

29、will be such that screw may be assembled for a minimum of two full turns into the threaded hole of a concentricity sleeve gage as shown below. TABLE 1 - MAXIMUM GAGING LENGTHS (LG ) Dimensions in inches: Nominal Nominal Size Length 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 1-1

30、/2 .500 - - - - - - 1-3/4 .500 .625 .500 - - - - - 2 1.000 .625 .500 .625 - - - 2-1/4 1.000 1.125 1.000 .625 .750 .750 - 2-1/2 1.500 1.125 1.000 1.125 .750 .750 .750 - - - 2-3/4 1.500 1.625 1.500 1.125 .750 .750 .750 - - - 3 2.000 1.625 1.500 1.625 1.500 1.500 .750 1.000 - - - 3-1/4 2.000 2.125 2.00

31、0 1.625 1.500 1.500 1.500 1.000 1.000 - - 3-1/2 2.500 2.125 2.000 2.125 1.500 1.500 1.500 1.000 1.000 1.000 - - - - 3-3/4 2.500 2.625 2.500 2.125 2.250 2.250 1.500 1.000 1.000 1.000 1.000 - - - 4 3.000 2.625 2.500 2.625 2.250 2.250 2.250 2.000 1.000 1.000 1.000 1.000 - - 4-1/4 3.000 3.125 3.000 2.62

32、5 2.250 2.250 2.250 2.000 1.000 1.000 1.000 1.000 1.000 - 4-1/2 3.500 3.125 3.000 3.125 3.000 3.000 2.250 2.000 2.000 2.000 1.000 1.000 1.000 1.000 4-3/4 3.500 3.625 3.500 3.125 3.000 3.000 3.000 2.000 2.000 2.000 2.000 1.000 1.000 1.000 5 4.000 3.625 3.500 3.625 3.000 3.000 3.000 3.000 2.000 2.000

33、2.000 2.000 1.000 1.000 5-1/4 - 4.125 4.000 3.625 3.750 3.750 3.000 3.000 3.000 2.000 2.000 2.000 2.000 1.000 5-1/2 - 4.125 4.000 4.125 3.750 3.750 3.750 3.000 3.000 3.000 2.000 2.000 2.000 2.000 5-3/4 - 4.625 4.500 4.125 3.750 3.750 3.750 3.000 3.000 3.000 3.000 2.000 2.000 2.000 6 - 4.625 4.500 4.

34、625 4.500 4.500 3.750 4.000 3.000 3.000 3.000 3.000 2.000 2.000 6-1/4 - 5.125 5.000 4.625 4.500 4.500 4.500 4.000 4.000 3.000 3.000 3.000 3.000 2.000 6-1/2 - 5.125 5.000 5.125 4.500 4.500 4.500 4.000 4.000 4.000 3.000 3.000 3.000 3.000 6-3/4 - - 5.500 5.125 5.250 5.250 4.500 4.000 4.000 4.000 4.000

35、3.000 3.000 3.000 7 - - 5.500 5.625 5.250 5.250 5.250 5.000 4.000 4.000 4.000 4.000 3.000 3.000 7-1/4 - - 6.000 5.625 5.250 5.250 5.250 5.000 5.000 4.000 4.000 4.000 4.000 3.000 7-1/2 - - - 6.125 6.000 6.000 5.250 5.000 5.000 5.000 4.000 4.000 4.000 4.000 7-3/4 - - - 6.125 6.000 6.000 6.000 5.000 5.

36、000 5.000 5.000 4.000 4.000 4.000 8 - - - 6.625 6.000 6.750 6.000 6.000 5.000 5.000 5.000 5.000 4.000 4.000 8-1/2 - - - 7.125 7.000 6.750 6.750 6.000 6.000 6.000 5.000 5.000 5.000 4.000 9 - - - 7.625 7.000 7.750 6.750 7.000 6.000 6.000 6.000 5.000 5.000 5.000 9-1/2 - - - - 8.000 7.750 7.750 7.000 7.

37、000 7.000 6.000 6.000 5.000 5.000 10 - - - - 8.000 9.25 7.750 8.000 7.000 7.000 7.000 6.000 6.000 5.000 11 - - - - - 10.25 9.25 9.000 8.000 8.000 7.000 7.000 6.000 6.000 12 - - - - - 10.25 10.000 9.000 9.000 8.000 7.000 7.000 6.000 13 - - - - - - 11.000 10.000 10.000 9.000 8.000 7.000 7.000 14 - - -

38、 - - - 12.000 11.000 11.000 10.000 9.000 8.000 7.000 15 - - - - - - 13.000 12.000 12.000 11.000 10.000 9.000 8.000 16 - - - - - - 13.000 13.000 12.000 11.000 10.000 9.000 17 - - - - - - 14.000 14.000 13.000 12.000 11.000 10.000 18 - - - - - - 15.000 15.000 14.000 13.000 12.000 11.000 19 - - - - - -

39、- 16.000 15.000 14.000 13.000 12.000 20 - - - - - - - 17.000 16.000 15.000 14.000 13.000 13.0 THREAD RUNOUT AND BOW OF SHANK: A gage capable of checking the head and thread eccentricity along with the bow of shank on screws is illustrated below. The gage construction incorporates three primary compo

40、nents: ring gage A, shank sleeve B2 and head sleeve B1. Shank sleeve length can be varied to accommodate different lengths of product and also diameters D2 and D1 can be varied depending on the screw diameter and head size, respectively. Ring gage A and head sleeve B1 and centered on the sleeve B2 b

41、y means of the positioning plug shown below the gage proper and are secured in position by means of attachment screws C. The ring gage A is also set to Class 3B maximum pitch diameter. Diameter D1, of the head sleeve, equals the maximum flange diameter of the screw plus .031 inch allowance. Diameter

42、 D2, of the shank sleeve, equals the maximum screw diameter plus the runout allowance given on the following page as a function of product length. The shank sleeve length L2 NUMBER: MPAPS S-C-29.101-GS/PL TITLE: Flanged 12 Point Screws REVISION: 1506 This document is restricted and may not be sent o

43、utside 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 should be such that entering face of gage A extends beyond the last thread of the product to be inspected. Fa

44、ilure of the screw to enter the threads of gage or interference between the sides of hole D1 or D2 and the screw while engaging threads of the gage indicates excessive runout. 14.0 MATERIAL: MPAPS F-31, Part I, Class 9. 15.0 FINISH: As designated by part number, screws will be furnished plain, plate

45、d or coated in accordance with the Navistar Engineering Material Specification and class listed below: Plain (PLN). Zinc Aluminum Clear (ZACLR) MPAPS G-4518, Type I. Phosphate Coated (PHC) MPAPS G-1, Class B-2. High strength steel fasteners, e.g., Type 9 and Class 12.9 are more susceptible to hydrog

46、en embrittlement than lower strength fasteners. Thus electrochemical plating is not preferred. However, if this process cannot be avoided and is specified, the fasteners must be treated at an appropriate temperature for a sufficient period of time to remove hydrogen from the material as stated in A-

47、31, Part I, Surface Coatings and A-31 Appendix. 16.0 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 specification. 17.0 SURFACE DISCONTINUITIES: Surface discontinuities will

48、 be determined by methods shown in MPAPS F-31, Part I. Flanged 12-Point Screws NUMBER: MPAPS S-C-29.101-GS/PL TITLE: Flanged 12 Point Screws REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Supp

49、liers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 6 of 7 Dimensions in inches Nominal Size Or Basic Major Dia of Thread E C F D H J K Body Dia Min (Max Equal to Nom Size) Flange Diameter Width Across Flats Width Across Corner Head Height Wrenching Height Flange Thickness Max Min Max Min Min Max Min Min 1/4 .2500 .2435 .375 .365 .252 .244 .278 .260 .15 .058 5/16 .3125 .3053 .469 .457 .315 .306 .348 .312 .18 .074 3/8 .3750 .3678 .562 .550 .377 .