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 1.0 GENERAL: This standard conforms essentially with the SAE
2、 Standard and the American National Standard for Hexagon Socket Set Screws. 2.0 CONTENTS: Page General 1 Miscellaneous Dimensions 1 Points 2 Length 2 Threads 2 Material 3 Finishes 3 Restricted Chemical Substances 3 Policy for Selecting Parts for New Design 3 Workmanship 3 Dimensions 4 Part List 6 Te
3、chnical Information 7 3.0 MISCELLANEOUS DIMENSIONS: The socket end of screw will be flat, normal to the axis of the screw, and on screws longer than lengths tabulated in Table 1, the face will be chamfered. The chamfer will extend slightly below the root diameter of the thread and the angle of chamf
4、er will be 30 to 45. The edge between the flat and the chamfer may be slightly rounded. On screws of lengths equal to-or shorter than those listed in Table 1, the chamfering will be optional with the manufacturer and, where chamfered, the angle will not exceed 45. 3.1 Sockets: The minimum key engage
5、ments specified will apply only to screws having nominal lengths equal to or greater than those listed in Table 1 on 3. Sockets in screws of shorter lengths will be as deep as is practicable. NAVISTAR, INC. Material, Parts, and Process Specifications (MPAPS) NUMBER: MPAPS S-C-32.101-GS/PL Former Des
6、ignation: ESP-C-32.101-GS TITLE: Headless Hex Socket Set 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-32.101-GS - August 2006 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED
7、 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 practices and to determine the applic
8、ability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format; Combined GS, PP, NPP. NUMBER: MPAPS S-C-32.101-GS/PL TITLE: Headless Hex Socket Set Screws REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission fro
9、m Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 2 of 7 For broached sockets which are at or near the maximum size limit, the overcut resulting from dulling will not exceed 20 percent of the length of any hexagon flat. Suit
10、ability of sockets in set screws may be determined by use of hexagon socket gages specified in MPAPS S-C- 28.101-GS/PL. 4.0 POINTS: The point angle for flat and cup point screws of lengths equal to or longer than those listed in Table 1 will be 45 to 50. On screws of shorter length, the minimum poin
11、t angle may be reduced to 30. The external point angles specified will apply only to those portions of the angles which lie below the thread root diameter, it being recognized the angle within the thread profile may vary due to manufacturing processes. The tolerance on oval point radius will be plus
12、 .015 inch for screw sizes up to and including No. 5, and plus .031 inch for larger sizes. The axis of half dog points will not be eccentric with the axis of the thread by more than 3 percent of the basic screw diameter or .005 inch, for sizes up to and including 3/4 inch; or .010 inch, for larger s
13、izes; whichever is the smaller. (Eccentricity is defined as one-half of the total or full indicator reading.) Acceptance of style variations on the standard cup point, produced by some manufacturers, under part numbers for cup points shown herein, will be at the discretion of user. 5.0 LENGTH: The l
14、ength of set screws will be measured overall on a line parallel to the axis of the screw. The tolerance on length of set screws will be as tabulated below. Nominal Screw Length Tolerance on Length Up to 5/8, Incl .01 Over 5/8 to 2, Incl .02 Over 2 to 6, Incl .03 Over 6 .06 6.0 THREADS: Unified Serie
15、s, Class 3A. Acceptance gaging of Class 3A threads will be on the basis of thread ring gages. Since standard gages provide only for lengths of engagement up to 1-1/2 diameters, changes in pitch diameter of either or both external or internal thread may be required for longer lengths of engagement. N
16、UMBER: MPAPS S-C-32.101-GS/PL TITLE: Headless Hex Socket Set 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 required to assume all patent liability. 2015 by Navistar, Inc.
17、 JUNE 2015 Page 3 of 7 7.0 MATERIAL: Socket set screws will be made from steel or corrosion resistant steel conforming to the specifications below: Steel set screws will be fabricated from an alloy steel having one or more of the following alloying elements: chromium, nickel, molybdenum, or vanadium
18、, in sufficient quantity to assure that the hardness range at the surface of Rockwell C45 to 53 is met when the screws are hardened by quenching from austenetizing temperature and tempered. Corrosion resistant steel set screws will be fabricated from austenitic corrosion resistant steel of type 304
19、per MPAPS A-37. 8.0 FINISH: Screws will be furnished plain, plated, or coated in accordance with the Navistar Engineering Material Specification and class listed below: Zinc Trivalent, Class 6A (ZN6A) MPAPS G-20, Class 6A. Phosphate Coated (PHC) MPAPS G-1, Class B2. Blued (BLU) - Standard with manuf
20、acturer. 9.0 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. 10.0 POLICY FOR SELECTING PARTS FOR NEW DESIGN: Approved parts are so designated to reduce variety
21、 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. Sizes: 6, 8, 10, 1/4, 5/16, 3/8, 1/2, 5/8, 3/4 Point: Cup Thread: UNC 3A Material: Alloy Steel Finish: Plain (PLN), Zinc Trivalent,
22、 Class 6A (ZN6A), and Phosphate Coating (PHC) Length Incrementation: 0 to 1/2 inch 1/16 Over 1/2 to 1 inch 1/8 Over 1 to 2 inches 1/4 Over 2 inches 1/2 11.0 WORKMANSHIP: Set screws will be free from burrs, loose scale, and other defects affecting their serviceability; threads will be free from slive
23、rs, splits, laps, or defects due to imperfections of thread rolling dies. NUMBER: MPAPS S-C-32.101-GS/PL TITLE: Headless Hex Socket Set Screws REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Su
24、ppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 4 of 7 Table 1 - Determinant Screw Lengths Nominal Size Nominal Screw Length Cup and Flat Points Oval and 90 Cone Points Half Dog Point 0 7 /64 1 /8 7 /64 1 1 /8 9 /64 1 /8 2 1 /8 9 /64 9 /64 3 9 /64 5 /32 5 /
25、32 4 9 /64 11 /64 5 /32 5 3 /16 3 /16 11 /64 6 11 /64 13 /64 3 /16 8 3/16 7/32 13/64 10 3/16 1/4 15/64 1 /4 1 /4 5 /16 19 /64 5/16 5 /16 25 /64 23 /64 3 /8 3 /8 7 /16 7 /16 7/16 7/16 35/64 31/64 1 /2 1 /2 39 /64 35 /64 5/8 5 /8 49 /64 43 /64 3 /4 3 /4 29 /32 51 /64 7 /8 7 /8 1- 1 /8 63 /64 1 1 1- 17
26、 /64 1- 1 /8 1- 1 /8 1-1 /8 1- 25 /64 1- 3 /16 1-1 /4 1-1 /4 1- 1 /2 1- 5 /16 1- 3 /8 1-3 /8 1- 21 /32 1- 7 /16 1- 1 /2 1-1 /2 1- 51 /64 1- 9 /16 1- 3 /4 1-3 /4 2- 7 /32 1- 61 /64 2 2 2-25 /64 2- 5 /64 12.0 DIMENSIONS: NUMBER: MPAPS S-C-32.101-GS/PL TITLE: Headless Hex Socket Set Screws REVISION: 15
27、06 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 Dimensions in inches: NominalSize Threads Per Inch J* N*
28、Q R S T U THREAD DETAIL Socket Width Across Flats Key Engagement Cup and Flat Point Diameter Oval Point Radius Cone Point Angle Half Dog Point Pitch Diameter 90 2 for This length and Over 118 2 for all shorter lengths Diameter Length Max Min Min Max Min Max Min Max Min Max Min Max Min *0 80 .0285 .0
29、280 .050 .033 .027 .060 .045 5/64 .040 .037 .017 .013 .0519 .0506 *1 64 .0355 .0350 .060 .040 .033 .070 .055 3/32 .049 .045 .021 .017 .0629 .0614 *1 72 .0355 .0350 .060 .040 .033 .070 .055 3/32 .049 .045 .021 .017 .0640 .0626 *2 56 .0355 .0350 .060 .047 .039 .079 .064 7/64 .057 .053 .024 .020 .0744
30、.0728 *2 64 .0355 .0350 .060 .047 .039 .079 .064 7/64 .057 .053 .024 .020 .0759 .0744 *3 48 .0510 .0500 .070 .054 .045 .089 .074 1/8 .066 .062 .027 .023 .0855 .0838 *3 56 .0510 .0500 .070 .054 .045 .089 .074 1/8 .066 .062 .027 .023 .0874 .0858 *4 40 .0510 .0500 .070 .061 .051 .099 .084 5/32 .075 .07
31、0 .030 .026 .0958 .0939 *4 48 .0510 .0500 .070 .061 .051 .099 .084 5/32 .075 .070 .030 .026 .0985 .0967 *5 40 .0635 .0625 .080 .067 .057 .109 .094 3/16 .083 .078 .033 .027 .1088 .1069 *5 44 .0635 .0625 .080 .067 .057 .109 .094 3/16 .083 .078 .033 .027 .1102 .1083 *6 32 .0635 .0625 .080 .074 .064 .13
32、5 .104 3/16 .092 .087 .038 .032 .1177 .1156 *6 40 .0635 .0625 .080 .074 .064 .135 .104 3/16 .092 .087 .038 .032 .1218 .1198 *8 32 .0791 .0781 .090 .087 .076 .154 .123 1/4 .109 .103 .043 .037 .1437 .1415 *8 36 .0791 .0781 .090 .087 .076 .154 .123 1/4 .109 .103 .043 .037 .1460 .1439 *10 24 .0952 .0937
33、 .100 .102 .088 .173 .142 1/4 .127 .120 .049 .041 .1629 .1604 *10 32 .0952 .0937 .100 .102 .088 .173 .142 1/4 .127 .120 .049 .041 .1697 .1674 *1/4 20 .1270 .1250 .125 .132 .118 .219 .188 5/16 .156 .149 .067 .059 .2175 .2147 *1/4 28 ,1270 .1250 .125 .132 .118 .219 .188 5/16 .156 .149 .067 .059 .2268
34、.2243 *5/16 18 .1587 .1562 .156 .172 .156 .265 .234 3/8 .203 .195 .082 .074 .2764 .2734 *5/16 24 ,1587 .1562 .156 .172 .156 .265 .234 3/8 .203 .195 .082 .074 .2854 .3827 *3/8 16 .1900 .1875 .188 .212 .194 .312 .281 7/16 .250 .241 .099 .089 .3344 .3311 *3/8 24 .1900 .1875 .188 .212 .194 .312 .281 7/1
35、6 .250 .241 .099 .089 .3479 .3450 *7/16 14 .2217 .2187 .219 .252 .232 .359 .328 1/2 .297 .287 .114 .104 .3911 .3876 *7/16 20 .2217 .2187 .219 .252 .232 .359 .328 1/2 .297 .287 .114 .104 .4050 .4019 *1/2 13 .2530 .2500 .250 .291 .270 .406 .375 9/16 .344 .334 .130 .120 .4500 .4463 *1/2 20 .2530 .2500
36、.250 .291 .270 .406 .375 9/16 .344 .334 .130 .120 .4675 .4643 *5/8 11 .3160 .3125 .312 .371 .347 .500 .469 3/4 .469 .456 .164 .148 .5660 .5619 *5/8 18 .3160 .3125 .312 .371 .347 .500 .469 3/4 .469 .456 .164 .148 .5889 .5854 *3/4 10 .3790 .3750 .375 .450 .425 .593 .562 7/8 .562 .549 .196 .180 .6850 .
37、6806 *3/4 16 .3790 .3750 .375 .450 .425 .593 .562 7/8 .562 .549 .196 .180 .7094 .7056 *7/8 9 .5050 .5000 .500 .530 .502 .687 .656 1 .656 .642 .227 .211 .8028 .7981 *7/8 14 .5050 .5000 .500 .530 .502 .687 .656 1 .656 .642 .227 .211 .8286 .8245 *1 8 .5680 .5625 .562 .609 .579 .781 .750 1-1/8 .750 .734
38、 .260 .240 .9188 .9137 *1 12 .5680 .5625 .562 .609 .579 .781 .750 1-1/8 .750 .734 .260 .240 .9459 .9415 *1 14 .5680 .5625 .562 .609 .579 .781 .750 1-1/8 .750 .734 .260 .240 .9536 .9494 * Non-Preferred Sizes, Threads, and Points * See paragraph headed “Sockets“ in section 3 NUMBER: MPAPS S-C-32.101-G
39、S/PL TITLE: Headless Hex Socket Set 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 required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 6 of 7 Di
40、mensions in inches: NominalSize Threads Per Inch J* N* Q R S T U THREAD DETAIL Socket Width Across Flats Key Engage- ment Cup and Flat Point Diameter Oval Point Radius Cone Point Angle 90 2 f r This Length and Over 118 2 for All shorter Lengths Half Dog Point Pitch Diameter Diameter Length Max Min M
41、in Max Min. Max Min. Max Min Max Min. Max Min. * 1-1/8 7 .5680 .5625 .562 .689 .655 .875 .844 1-1/4 .844 .826 .291 .271 1.0322 1.0268 * 1-1/8 12 .5680 .5625 .562 .689 .655 .875 .844 1-1/4 .844 .826 .291 .271 1.0709 1.0664 * 1-1/4 7 .6310 .6250 .625 .767 .733 .969 .938 1-1/2 .938 .920 .323 .303 1.157
42、2 1.1517 * 1-1/4 12 .6310 .6250 .625 .767 .733 .969 .938 1-1/2 .938 .920 .323 .303 1.1959 1.1913 * 1-3/8 6 .6310 .6250 .625 .848 .808 1.062 1.031 1-5/8 1.031 1.011 .354 .334 1.2667 1.2607 * 1-3/8 12 .7570 .6250 .625 .848 .808 1.062 1.031 1-5/8 1.031 1.011 .354 .334 1.3209 1.3162 *1-1/2 6 .7570 .7500
43、 .750 .926 .886 1.156 1.125 1-3/4 1.125 1.105 .385 .365 1.3917 1.3856 *1-1/2 12 .7570 .7500 .750 .926 .886 1.156 1.125 1-3/4 1.125 1.105 .385 .365 1.4459 1.4411 * 1-3/4 5 1.0100 1.0000 1.000 1.086 1.039 1.343 1.312 2 1.312 1.289 .488 .428 1.6201 1.6134 * 1-3/4 12 1.0100 1.0000 1.000 1.086 1.039 1.34
44、3 1.312 2 1.312 1.289 .448 .428 1.6959 1.6914 * 2 4-1/2 1.0100 1.0000 1.000 1.244 1.193 1.531 1.500 2-1/4 1.500 1.474 .510 .490 1.8557 1.8486 * 2 12 1.0100 1.0000 1.00 1.244 1.193 1.531 1.500 1-1/4 1.500 1.474 .510 .490 1.9459 1.9414 * Non-Preferred Sizes and Points * See section 3.1 headed “Sockets
45、“ 13.0 PART LIST: 13.1 Approved: 13.2 Not for New Design: Nominal Size-TPI Length Point Type Finish Part Number 1/4 -20 1 1/4 CUP BLU 3902082C1 3/8 -16 3/8 CUP PLN 102592 Nominal Size-TPI Length Point Type Finish Part Number 10 -24 1/4 CUP PHC 426094 1/4 -20 3/8 CUP ZN6A 125735 5/16 -18 3/4 CUP ZN6A
46、 191951 3/8 -16 1 /2 CUP ZN6A 426374 3/8 -16 1 1/2 CUP ZN6A 23309R1 1/4 -20 2 CUP PLN 102579 1/2 -13 1 CUP PLN 102619 NUMBER: MPAPS S-C-32.101-GS/PL TITLE: Headless Hex Socket Set Screws REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permi
47、ssion from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 7 of 7 14.0 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:/
