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 18 NAVISTAR, INC. Material, Parts, and Process Specifications
2、(MPAPS) NUMBER: MPAPS S-DM-1.101-GS/PL Former Designation: ESP-DM-1.101-GS TITLE: Tapping Screws Metric Series CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-DM-1.101-GS - August 2006 PRINTED COPIES OF THIS DOCUMENT M
3、UST 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 practices and to deter
4、mine the applicability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format; Combined GS, GI, PP. 1.0 GENERAL: This standard may differ in some respects with certain segments of national standards. In recognition of these differences, the sizes and tolerance ranges used were
5、 established in an effort to enable the use of commercially available items, dimensionally interchangeable worldwide. Implementation of this standard must be in accordance with the policies and procedures outlined in MPAPS S-A-0.101. There may also be supplemental group instructions in regard to use
6、 of metric standards that should be taken into account. This standard covers requirements for metric series steel, self-drilling, tapping screws and contains the essentials of inch dimensioned SAE J78 and following standards: International Organization for Standardization: ISO 261, 965, 1478, 1479,
7、4757, 7045, 7047, 7049, 7051 and 7721 The inclusion of dimensional data is not intended to imply that all the screws described are stock production sizes. 2.0 CONTENTS: Page General 1 Design Consideration 2 Metric-Inch Related Sizes 2 Color Coding 3 Method of Designation 3 Minimum Practical Screw Le
8、ngth 3 Application Data For Spaced Thread Screws (Types C and F) 4 Application Data For Thread Cutting Screws (Types D, F and T) 5 References 6 Policy for Selecting Parts for New Design 6 Head 7 NUMBER: MPAPS S-DM-1.101-GS/PL TITLE: Tapping Screws REVISION: 1506 This document is restricted and may n
9、ot 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 18 3.0 DESIGN CONSIDERATIONS: Two drives, ISO Type H recess and hex washer head, will be considered
10、 as part of this standard for standardization purposes and manufacturing advantages. Type H recess is preferred over slotted because of improved driving characteristics. Hexagon washer heads, in addition to greater bearing area, provide a shoulder for the socket, thus protecting the assembly surface
11、 from socket disfigurement. Type C point is preferred in most thread forming applications for rapid assembly. Blunt points are specified where damage to hose, wire damage or customer operator injury is possible. Thread cutting screws are not generally recommended in cast metals having a thickness le
12、ss than three thread pitches or in metal parts with thread engagement greater than 10 pitches. Thicker materials can be fastened by counterboring to give the proper length of thread engagement. Short screw applications may require a hole size smaller than the recommended hole size. Generally two ful
13、l threads above the slot should be engaged, particularly when using Type T. For best results with plastic applications, all holes should be counterbored to prevent fracturing the plastic. Type BSD spaced threads are essentially a direct conversion of present inch standards. Inch data in MPAPS S-D-40
14、.101-GS/PL will apply in cases where metric series is a direct conversion. Self-drilling and tapping screws should be considered for use in attachments which will require drilling of holes at the point of screw installation. For such usage to be practical, however, the application must have good acc
15、essibility for the power tool to drive as near to perpendicular to the work surface as possible and permit the operator to apply adequate end pressure without undue fatigue. Self-drilling and tapping screws should not be used in thermoplastic materials or in blind holes. 4.0 METRIC-INCH RELATED SIZE
16、S: 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 a means of determining approximate equivalents. Page Hex Washer Heads 8 Threads 8 Length 9
17、 Material Finish Restricted Chemical Substances Workmanship 10 11 11 11 Position Tolerance 11 Reference Data 11 Oval Head Cross Recess Tapping Screws 13 Pan Head Cross Recess Tapping Screws 15 Hexagon Washer Head Tapping Screws 16 Technical Information 18 NUMBER: MPAPS S-DM-1.101-GS/PL TITLE: Tappin
18、g 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 3 of 18 Spaced Thread Screws (Types BSD) Sp
19、aced Thread Screws (Types C and F) Machine Screw Threads (Types D, F, and T) Metric Series mm Approximate Inch Series Metric Series mm Approximate Inch Series Metric Series mm Approximate Inch Series 3.5 #6 3.5 #6 3 #4, #5 4.2 #8 4.2 #8 4 #6, #8 4.8 #10 4.8 #10 5 #10 6.3 1/4 6.3 1/4 8 #12, 1/4 8 5/1
20、6 10 3/8 5.0 COLOR CODING: Not recommended, except in cases where adequate insurance is needed to prevent mixing of “metric parts“ with look-alike “inch parts.“ The color blue is a standard identifier used in some industries. This must be handled internally at individual plants, where needed, and is
21、 meant to be supplemental to the normal finish and easily deleted when the need for supplemental 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 o
22、f color identity. 6.0 METHOD OF DESIGNATION: Metric tapping screws will be designated on purchase orders by nominal size, pitch, length, point type, product name, including head type and driving provision, material, finish, and part number as shown in the following examples: 6.3 x 1.8 x 20 mm, Type
23、H Recess, Pan Head Tapping Screw, Type C, STL, PHC, Part Number 4.2 x 1.4 x 10 mm, Hex Washer Head Tapping Screw, Type F, STL, PHC, Part Number 4 x 0.7 x 8 mm, Type H Recess, Pan Head Tapping Screw, Type D, STL, ZN6A, Part Number 10 x 1.5 x 25 mm, Hex Washer Head Tapping Screw, Type T, STL, ZN6A, Pa
24、rt Number Metric self-drilling tapping screws will be designated on purchase orders by size, pitch, length, type, word description, (product name, including head, point style), material, finish, and part number as shown in the following example: 6.3 x 1.81 x 20 mm, Type BSD, Type lA Recess Pan Head.
25、 Style 2 point, Self-Drilling Tapping Screw, STL, PHC 4.2 x 1.41 x 10 mm, Type BSD, Hex Washer Head, Style 2 point, Self-Drilling Tapping Screw, STL, PHC 7.0 MINIMUM PRACTICAL SCREW LENGTH: Lengths shown below are theoretical minimum. Refer to section 12.0 for recommended diameter - length combinati
26、ons. These values are to assist the user in the selection of proper screw lengths and will not be subject to inspection. Nominal Size Minimum Practical Screw Lengths Types C and F Pan and Hex Washer Heads Nominal Size Minimum Practical Screw Lengths Types D, F. and T Pan and Hex Washer Heads 3.5 8.7
27、 3 5 4.2 8.7 4 6 4.8 8.7 5 8 6.3 12.2 6 10 8 15.2 8 12 10 15 NUMBER: MPAPS S-DM-1.101-GS/PL TITLE: 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 assum
28、e all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 4 of 18 8.0 APPLICATION DATA FOR SPACED THREAD SCREWS (Types C and F): The following is published as a guide only. Because conditions differ widely, it may be necessary to modify the hole size to suit a particular application. The advisab
29、ility and the extent of such modifications can best be determined by experiment in the particular assembly environment. Refer to MPAPS S-D-200.101-GS/PL & MPAPS S-D-200.102-GS/PL for more comprehensive data concerning holes. Drilled or Clean-Punched Holes in Sheet Metal Dimensions in millimeters: D1
30、 Nominal Size 3.5 4 4.2 4.8 4.8 5.4 6.3 7 D2 Clearance Hole * S D3 Hole Size 0.1 -0 Thickness Range Sheet Metal Aluminum Brass Steel Aluminum Brass Steel Aluminum Brass Steel Aluminum Brass Steel Material Over 0.6 To 0.8 mm 2.7 3.2 3.7 Over 0.8 To 1.2 mm 2.65 2.8 3 3.2 3.7 3.7 4.9 Over 1.2 To 1.4 mm
31、 2.65 2.8 3.2 3.3 3.7 3.9 4.9 Over 1.4 To 1.6 mm 2.7 2.9 3.5 3.5 3.7 3.9 5 5 Over 1.6 To 1.8 mm 2.8 3 3.5 3.5 3.7 3.9 5 5 Over 1.8 To 2 mm 2.8 3 3.5 3.5 3.8 4 5 5.2 Over 2 To 2.5 mm 2.8 3 3.5 3.5 3.8 4 5.2 5.3 Over 2.5 To 3mm 2.9 3.2 3.7 3.8 3.8 4.1 5.2 5.3 Over 3 To 3.2 mm 3 3.7 3.8 3.9 4.3 5.2 5.8
32、 Over 3.2 To 3.5 mm 3 3.8 3.9 3.9 4.3 5.3 5.8 Over 3.5 To 4mm 3 3.9 3.9 4.3 5.3 5.8 Over 4 To 4.8 mm 3 3.9 4 4.4 5.4 5.9 Over 4.8 To 5 mm 3 3.9 4.2 5.6 5.9 Over 5 To 6 mm 3 3.9 4.2 5.8 Over 6 To 10 mm 3.9 4.2 5.8 *As thickness of the member to be tapped becomes greater it is recommended that a clear
33、ance hole be placed in the upper sheet to relieve the torque strain required and it insure against wedging of threads which would tend to keep sections apart. 9.0 APPLICATION DATA FOR SPACED THREAD SCREWS (Types C and F): Pierced or Extruded Holes in Sheet Metal NUMBER: MPAPS S-DM-1.101-GS/PL TITLE:
34、 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 Navistar, Inc. JUNE 2015 Page 5 of 18 Dimensions to millimeters: D
35、1 Nominal Size 3.5 4.2 4.8 6.3 S Sheet Metal Thickness Range All Over 0.7 to 1.4 mm Materials Aluminum Brass Aluminum Brass Aluminum Brass Aluminum Brass Steel Steel Steel Steel D4 Hole Size+0. 1 0 2.8 3.5 4 5.3 H Hole Extrusion Min 1.2 1.3 1.5 1.8 r Extrusion Radius Max 0.25 0.25 0.25 0.25 z Spacin
36、g Min 7 7.4 7.6 8.3 Blind Holes in Nonferrous Castings or Plastics Dimensions in millimeters: D1 Nominal Size 3.5 4.2 4.8 6.3 Material Nonferrous Castings D5 Hole Size 3.2 3.9 4.5 6 F1 Thread En a Engagement Min 6.4 6.4 6.4 8 Plastics Material Acrylic Cellulosic Styrene Phenolic Acrylic Cellulosic S
37、tyrene Phenolic Acrylic Cellulosic Styrene Phenolic Acrylic Cellulosic Styrene Phenolic D5 Hole Size Nom 3 3.2 3.7 3.8 4.3 4.5 5.6 6 F1 Thread Engagement Min 6.4 8 8 9.5 10.0 APPLICATION DATA FOR THREAD CUTTING SCREWS (Types D, F, & T): The following is published as a guide only. Because conditions
38、differ widely, it may be necessary to modify the hole size to suit a particular application. The advisability and the extent of such modifications can best be determined by experiment in the particular assembly environment. Refer to MPAPS S-D-200.101-GS/PL for more comprehensive data concerning hole
39、s. * Values listed are for 410 SST screws in high tensile stainless steel. Parenthesis indicate Type D screw which is recommended for steel parts with thickness less than 1 /2 of the screw diameter. Type T screws are recommended for all other applications in metal because of the wide cutting slot wi
40、th addition chip clearance. NUMBER: MPAPS S-DM-1.101-GS/PL TITLE: 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 N
41、avistar, Inc. JUNE 2015 Page 6 of 18 Holes in Castings Dimensions in millimeters: Nominal Size 3 4 5 6 8 10 Casting Thickness Range * Casting Materials AL IRN AL IRN AL IRN AL IRN AL IRN AL IRN & ZN & ZN & ZN & ZN & ZN & ZN Hole Size 3 up to 3.9 2.7 2.8 3.6 3.7 4.5 4.7 5.4 5.6 7.3 7.5 9.1 9.4 4 up t
42、o 4.9 2.7 2.8 3.6 3.8 4.5 4.7 5.4 5.6 7.3 7.6 9.2 9.5 5 up to 6.4 2.7 2.8 3.6 3.8 4.6 4.8 5.5 5.7 7.3 7.6 9.2 9.5 6.5 up to 8 2.8 2.9 3.7 3.8 4.6 4.8 5.5 5.7 7.4 7.6 9.3 9.6 8 up to 9.9 2.8 2.9 3.7 3.8 4.6 4.8 5.6 5.7 7.5 7.6 9.3 9.6 10 and over 2.8 2.9 3.7 3.8 4.7 4.8 5.6 5.7 7.5 7.6 9.4 9.6 * Not
43、recommended for thicknesses less than 3 mm. 11.0 REFERENCES: General Specifications pertaining to this product are printed in MPAPS S-D-1.101-GS/PL, inch series tapping screws and in MPAPS S-D-40.101-GS/PL, inch series self-drilling tapping screws. Essential data for design layout and detailing purp
44、oses is provided in the following paragraphs. 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. Mat
45、erial: Carbon Steel (CST) Finishes: Phosphate Coating (PHC) and Zinc Trivalent (ZN6A) Nominal Sizes and Length Incrementation: See charts below. Drilled or Clean-Punched Holes in Sheet Metal Dimensions in millimeters: 3 4 5 6 8 10 Materials CST SST* AL CST SST* AL CST SST* AL CST SST* AL CST SST* AL
46、 CST SST* AL Hole Sizes 1 up to 1.4 (2.55) (2.6) 2.5 (3.3) (3.4) 3.3 (4.3) (4.3) 4.2 (5.1) (5.2) 5 (6.8) (6.9) 6.8 (8.6) (8.7) 8.5 1.5 up to 1.9 2.55 2.6 2.55 (3.4) (3.5) 3.4 (4.3) (4.4) 4.3 (5.1) (5.2) 5.1 (6.9) (7 ) 6.8 (8.7) (8.8) 8.6 2 up to 2.4 2.6 2.6 2.55 3.4 3.5 3.4 (4.4) (4.4) 4.3 (5.2) (5.
47、3) 5.1 (7 ) (7.1) 6.9 (8.8) (8.9) 8.7 2.5 up to 2.9 2.6 2.7 2.6 3.5 3.6 3.4 4.4 4.5 4.3 (5.3) (5.4) 5.2 (7.1) (7.2) 7 (8.9) (9 1 8.8 3 up to 3.9 2.7 2.7 2.6 3.5 3.6 3.5 4.5 4.5 4.4 (5.3) (5.4) 5.2 (7.2) (7.3) 7 (9) (9.1) 8.8 4 up to 4.9 2.7 2.8 2.7 3.6 3.7 3.5 4.6 4.6 4.5 5.5 5.6 5.3 7.3 7.4 7.2 9.2
48、 9.3 9 5 up to 6.4 2.8 2.8 2.7 3.7 3.8 3.6 4.7 4.8 4.5 5.6 5.7 5.4 7.5 7.6 7.3 9.4 9.5 9.2 6.5 up to 7.9 2.8 2.9 2.8 3.8 3.8 3.7 4.7 4.8 4.7 5.7 5.7 5.6 7.6 7.7 7.5 9.5 9.6 9.4 8 and over 2.8 2.9 2.8 3.8 3.8 3.8 4.7 4.8 4.7 5.7 5.7 5.7 7.6 7.7 7.6 9.5 9.6 9.5 NUMBER: MPAPS S-DM-1.101-GS/PL TITLE: Ta
49、pping 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 7 of 18 Spaced Threads Machine Screw Threads (Types C and F) (Types D, F, and T) Length mm Nominal Size 3.5 4.2 4.8 6.3 8 8 10 X X X 13 X X X X 16 X X X X X 20 X X X X X 25 X X X X X 30 X X X 35 X X X 40
