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-D-300.101-GS/PL Former Designation: ESP-D-300.101-GS TITLE: Recommended Hole Sizes for Tapping Screws-English Series (Noun Code 7450) CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-D-300.101-GS
3、- September 2000 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 ap
4、propriate safety and health practices and to determine the applicability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format. 1.0 GENERAL: The hole sizes tabulated on subsequent pages for the various types of tapping screws in commonly used materials represent recommendatio
5、ns based on practical experience of screw manufacturers and users and are not to be misconstrued as being a part of the tapping screw specifications. (Performance requirements are set forth in MPAPS S-D-100.101-GS/PL) 2.0 RESTRICTED CHEMICAL SUBSTANCES: Effective January 1, 2007, all product supplie
6、d to the requirements of this specification must comply with the requirements of the MPAPS B-50 specification. 3.0 CONTENTS: 4.0 ASSEMBLY CONSIDERATION: The finish (plain, plated or coated) on tapping screws and the material composition and hardness of the mating component are factors which often af
7、fect the facility and strength of assembly in individual applications. Although the hole sizes specified herein were originally based on the use of plain (unfinished) carbon steel screws, experience has since proven the recommended holes to be suitable for screws with most types of commercial finish
8、es. However, it should be noted, that due to various finishes having different degrees of lubricity, some adjustment of installation torques may be necessary to suit specific applications. Also, where exceptionally heavy platings and coatings are involved or where screws are to be assembled into mat
9、erials of relatively high hardness, slight deviations from the specified hole sizes Page General 1 Restricted Chemical Substances Assembly Consideration 1 1 Tolerance 2 Use of Extruded Holes 2 Flange Dimensions For Extruded Holes 2 Approximate Hole Sizes For Wood Screws 7 Technical Information 7 NUM
10、BER: MPAPS S-D-300.101-GS/PL TITLE: Recommended Hole Sizes for Tapping 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 Navi
11、star, Inc. JUNE 2015 Page 2 of 7 may be required to provide optimum assembly. The advisability and the extent of such deviations can best be determined by experiment in the particular assembly environment. 5.0 TOLERANCE: Application of a plus .004, minus .000, tolerance on the hole sizes tabulated h
12、as been found satisfactory for most general assembly conditions. 6.0 USE OF EXTRUDED HOLES: It is advisable to limit the use of extruded hole to material thicker than 1/5 the nominal diameter of the screw so there will be enough strength in the extruded hole to develop a reasonable proportion of the
13、 strength of the screw. In other words, avoid using screws larger than 5 times the material thickness. Screws in extruded holes in thin material develop twice as much fastening strength as could be developed with the unextruded plate. At the other extreme, the full strength of the thread forming scr
14、ew can normally be developed with a drilled or clean punched hole when the material thickness exceeds 75% of the screw diameter making extrusion unnecessary. Use only thread forming screws or thread forming taps with extrusions because thread cutting screws and thread cutting taps cut away so much o
15、f the thin wall of the extrusion that the strength of the fastening is impaired. 7.0 FLANGE DIMENSIONS FOR EXTRUDED HOLES: Apply to extruded holes in low carbon sheet stock .025 to .213 thick; 50-70 Rockwell B. These dimensions are for flanged holes produced by a shoulder-type punch. First, a small
16、hole is produced by the flat end of the punch and then this hole is enlarged to the desired size by the body of the punch. The metal flows into the die opening producing a projection with a reasonably smooth edge. Hole Dia. D Metal Thickness T .024 thru .035 .042 thru .048 .060 .075 .090 .106 .118 .
17、122 H R H R H R H R H R H R H R H R Over .08 Thru .10 .040 .005 .040 .005 .040 .006 .043 .008 .043 .010 Over .10 Thru .13 .047 .005 .047 .005 .047 .006 .052 008 .052 .010 .054 .010 Over .13 Thru .15 .053 .005 .053 .005 .053 .006 .060 .008 .060 .010 .063 .010 .063 .012 .072 .013 Over .15 Thru .18 .06
18、0 .005 .061 .006 .070 .008 .070 .010 .075 .010 .075 .012 .087 .013 Over .18 Thru .22 .070 .005 .070 .006 .090 008 .090 .010 .095 .010 .095 .012 .104 .013 Over .22 Thru .26 .075 .006 .100 .008 .100 .010 .105 .010 .105 .012 .120 .013 Over .26 Thru .30 .083 .006 .116 .008 .116 .010 .125 .010 .125 .012
19、.140 .013 Over .30 Thru .34 .130 008 .130 .010 .140 .010 .140 .012 .154 .013 Over .34 Thru .38 .140 .010 .155 .010 .155 .012 .170 .013 Over .38 Thru .43 .150 .010 .170 .010 .170 .012 .184 .013 Minium Extrusion Thickness W Nominal Metal .024 .026 .030 .032 .035 .041 .048 .053 .060 .075 .090 .106 .118
20、 .125 Thickness Flange Thickness .012 .013 .015 .016 .017 .020 .024 .026 .030 .037 .045 .053 .059 .062 W Min. NUMBER: MPAPS S-D-300.101-GS/PL TITLE: Recommended Hole Sizes for Tapping Screws REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without p
21、ermission 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 Metal Thickness STEEL, STAINLESS STEEL MONEL METAL, BRASS ALUMINUM ALLOY Pierced or Extruded Hole Diameter Drilled or Clean-Punched Pie
22、rced or Extruded Drilled or Clean-Punched Hole Dia* Drill Size Hole Diameter Hole Dia* Drill Size 2 015 - .064 52 - - - 018 - .064 52 - 024 - .067 51 - .064 52 030 - .070 50 - .064 52 036 - .073 49 - .064 52 048 - .073 49 - .067 51 060 - .076 48 - .070 50 4 015 .086 .086 44 - - - 018 .086 .086 44 -
23、- - 024 .098 .089 43 .086 - - 030 .098 .094 42 .086 .086 44 036 .098 .094 42 .086 .086 44 048 - .096 41 .086 .086 44 060 - .100 39 - .089 43 075 - .102 38 - .089 43 105 - - - - .094 42 6 015 .111 .104 37 - - - 018 .111 .104 37 - - - 024 .111 .106 36 .111 - - 030 .111 .106 36 .111 .104 37 036 .111 .1
24、10 35 .111 .104. 37 048 - .111 34 .111 .104 37 060 - .116 32 - .106 36 075 - .120 31 - .110 35 105 - .128 30 - .111 34 .128 to .250 - - - - .120 31 7 018 .120 .116 32 - - - 024 .120 .116 32 .120 - - 030 .120 .116 32 .120 .113 33 036 .120 .116 32 .120 .113 33 048 .120 .120 31 .120 .116 32 060 - .128
25、30 - .120 31 075 - .136 29 - .128 30 105 - .140 28 - .136 29 .128 to .250 .136 29 8 018 .136 - - - - - 024 .136 .125 1/8 .136 - - 030 .136 .125 1/8 .136 .116 32 036 .136 .125 1/8 .136 .120 31 048 .136 .128 30 .136 .128 30 060 - .136 29 - .136 29 075 - .140 28 - .140 28 105 - .150 25 - .147 26 125 -
26、.150 25 - .147 26 135 - .152 24 - .149 25 .162 to .375 - - - - .152 24 10 018 .157 - - 024 .157 .144 27 .157 - - 030 .157 .144 27 .157 - - 036 .157 .147 26 .157 .144 27 048 .157 .152 24 .157 .144 27 060 - .152 24 - .144 27 075 - .157 22 - .147 26 105 - .161 20 - .147 26 125 - .170 18 - .154 23 135 -
27、 .170 18 - .154 23 164 - .173 17 - .159 21 .200 to .375 - - - .166 19 12 024 .185 .166 19 - - - 030 .185 .166 19 - - - .036 .185 .166 19 - - - .048 .185 .170 18 - .161 20 .060 - .177 16 - .166 19 .075 - .182 14 - .173 17 105 - .185 13 - .180 i5 125 - .196 9 - .182 14 135 - .196 9 - .182 14 164 - .20
28、1 7 - .189 12 .200 to .375 - - .196 9 1/4 030 209 194 10 - - - 036 209 194 10 - - - 048 209 194 10 - - - 060 - 199 8 - 199 8 075 - 204 6 - 201 7 105 = 209 4 - 204 6 125 228 1 - 209 4 135 - 228 1 - 209 4 164 - 234 15/64 - 213 3 187 - 234 15/64 - 213 3 194 - 234 15/64 - 221 2 .200 to .375 .228 1 Nomin
29、al Screw Hole Drill Material Thickness Penetration in Blind Holes Size Dia. * # Size Min Min Max 2 .073 49 .125 .188 .500 4 .100 39 .188 .250 .625 6 .125 1/8 .188 .250 .625 7 .136 29 .188 .250 .750 8 .144 27 .188 .250 .750 10 .173 17 .250 .312 1.000 12 .194 10 .312 .375 1.000 1/4 .228 1 .312 .375 1.
30、000 In Resin Impregnated Plywoods In Sheet Metals In Asbestos Compositions Nominal Screw Hole Drill Material Thickness Penetration in Blind Holes Size Dia. * Size Min Min Max 2 .076 48 .125 .188 .500 4 .101 38 .188 .250 .625 6 .120 31 .188 .250 .625 7 .136 29 .250 .312 .750 8 .147 26 .312 .375 .750
31、10 .166 19 .312 .375 1.000 12 .196 9 .312 .375 1.000 1/4 .228 1 .438 .500 1.000 In Aluminum, Magnesium, Zinc, & Brass Castings Nominal Screw Hole Drill Material Thickness Penetration in Blind HolesSize Dia. * Size Min Min Max 2 .076 48 .125 .188 .500 4 .101 38 .188 .250 .625 6 .120 31 .188 .250 .625
32、 7 .136 29 .250 .312 .750 8 .147 26 .312 .375 .750 10 .166 19 .312 .375 1.000 12 .196 9 .312 .375 1.000 1/4 .228 1 .438 .500 1.000 In Plastics PHENOL CEL ACETATE, CEL NITRATE Minimum Nominal FORMALDEHYDE ACRYLIC RESIN STYRENE RESIN Penetration in Bline Holes Screw Hole Drill Hole Drill Size Dia. * *
33、 Size Dia. * * Size 2 .078 47 .078 47 .188- 4 .100 39 .094 42 .250 6 .128 30 .120 31 .250 7 .136 29 .128 30 .250 8 .150 25 .144 27 .312 10 .177 16 .170 18 .312 12 .199 8 .191 11 .375 1/4 .234 15/64 .221 2 .375 * Hole sizes shown for wrought metals, resin impregnated plywoods, and asbestos compositio
34、ns are applicable to Type AB screws except those for sheet metal thicknesses of .105 or greater, which apply to Types B and BP only. * * Decimal values shown are standard drill sizes rounded-off to the nearest .001 inch. Based on full thread engagement of Type B Screw through entire material with ta
35、pered portion of screw projecting completely. Total length of thread in engagement. NUMBER: MPAPS S-D-300.101-GS/PL TITLE: Recommended Hole Sizes for Tapping Screws REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate T
36、echnical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 4 of 7 Nominal Screw Size Metal Thickness Hole Dia * Drill Size Nominal Screw Size Metal Thickness Hole Dia * Drill Size 2 .060 .073 49 10 .125 .166 19 .083 .073 49 .140 .166 19 .109 .076
37、 48 .188 .166 19 .125 .076 48 .250 .170 18 .140 .076 48 .312 .172 11/64 3 .060 .086 44 .375 .172 11/64 .083 .086 44 12 .125 .191 11 .109 .086 44 .140 .191 11 .125 .086 44 .188 .191 11 .140 .089 43 .250 .196 9 .188 .089 43 .312 .196 9 4 .109 .098 40 .375 .196 9 .125 .100 39 1/4 .125 .221 2 .140 .100
38、39 .140 .221 2 .188 .100 39 .188 .221 2 .250 .102 38 .250 .228 1 5 .109 .111 34 .312 .288 1 .125 .111 34 .375 .228 1 .140 .113 33 5/16 .125 .281 K .188 .113 33 .140 .281 K .250 .116 32 .188 .281 K 6 .125 .120 31 .250 .281 K .140 .120 31 .312 .290 L .188 .120 31 .375 .290 L .250 .125 1/8 3/8 .125 .34
39、4 11/32 .312 .125 1/8 .140 .344 11/32 8 .125 .149 25 .188 .344 11/32 .140 .149 25 .250 .344 11/32 .188 .149 25 .312 .348 S .250 .152 24 .375 .348 S .312 .152 24 Nominal Screw Size PHENOL FORMALDEHYDE CEL ACETATE, CEL NITRATE ACRYLIC RESIN STYRENE RESIN Penetration in Blind Holes Hole Dia. * * Drill
40、Size Hole Dia. * * Drill Size Min Max 2 .078 5/64 .076 48 .094 .250 3 .089 43 .089 43 .125 .312 4 .104 37 .100 39 .125 .312 5 .116 32 .113 33 .188 .375 6 .125 1/8 .120 31 .188 .375 8 .147 26 .144 27 .250 .500 10 .170 18 .166 19 .312 .625 12 .194 10 .189 12 .375 .625 1/4 .228 1 .221 2 .375 .750 * Dec
41、imal values shown are standard drill sizes rounded-off to the nearest .001 inch. Total length of thread in engagement Type BF and BT In Plastics Types BF and BT In Zinc and Aluminum Die Nominal Screw Size Threads Per Inch Metal Thickness STEEL Hole Dia. * * Drill Size .037 .094 42 .048 .094 42 4 40
42、.062 .096 41 .075 .100 39 .105 .102 38 .134 .102 38 .037 .113 33 .048 .116 32 6 32 .062 .116 32 .075 .122 3.l MM .105 .125 1/8 .134 .125 1/8 .037 .136 29 .048 .144 27 8 32 .062 .144 27 .075 .147 26 .105 .150 25 .134 .150 25 .037 .154 23 .048 .161 20 24 .062 .166 19 .075 .170 18 .105 .173 17 10 .134
43、.177 16 .037 .170 18 .048 .170 18 32 .062 .170 18 .075 .173 17 .105 .177 16 .134 .177 16 .037 .189 12 .048 .194 10 12 24 .062 .194 10 .075 .199 8 .105 .199 8 .134 .199 8 .037 .221 2 .048 .221 2 20 .062 .234 1 .075 .234 A .105 .234 A .134 .236 6 MM 1/4 .037 .224 5.7 MM .048 .228 1 .062 .232 5.9 MM 28
44、 .075 .234 A .105 .238 B .134 .238 B 5/16 .037 .290 L .048 .290 L 18 .062 .290 L .075 .295 M .105 .295 M .134 .295 M - - - 24 - - - 3/8 - - - 16 - - - - - - 24 - - - Type C In Sheet Metals NUMBER: MPAPS S-D-300.101-GS/PL TITLE: Recommended Hole Sizes for Tapping Screws REVISION: 1506 This document i
45、s 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 Types D, F, G, and T In Sheet Metals Nominal Screw Size Metal Thickness STE
46、EL ALUMINUM Hole Din. # * Drill Size Hole Dia. * Drill Size .050 .073 49 .070 50 .060 .073 49 .073 49 2-56 .083 .073 49 .073 49 .109 .073 49 .073 49 .125 .076 48 .073 49 .140 .076 48 .073 49 .050 .081 46 .078 5/64 .060 .081 46 .081 46 .083 .082 45 .082 45 3-48 .109 .086 44 .082 45 .125 .086 44 .082
47、45 .140 .086 44 .086 44 .187 .089 43 .086 44 .050 .089 43 .089 43 .060 .089 43 .089 43 .083 .094 42 .089 43 4-40 .109 .096 41 .094 42 .125 .098 40 .094 42 .140 .098 40 .094 3/32 .187 .102 38 .098 40 .050 .106 36 .102 38 .060 .106 36 .102 38 .083 .106 36 .104 37 5-40 .109 .106 36 .104 37 .125 .109 7/64 .106 36 .140 .110 35 .106 36 .187 .116 32 .110 35 .250 .116 32 .113 33 .050 .110 35 .109 7/64 .060 .113 33 .109 7/64 .083 .116 32 .111 34 6-32 .109 .116 32 .113 33 .125 .116 32 .116 32 .140 .120 31 .116 32 .187 .125 1/8 .120 31 .250 .125 1/8 .125 1/8 .050 .136 29 .136 29 .060 .14
