1、 ENGINEERING STANDARDS General Specification SUPERCEDED EDS-T-7035 Material and Performance Requirements for Metric Series Case Hardened Tapping Screws This standard may be applied only for current projects. It is Superceded for all future projects and replaced by GMW15170. -,Bd 4*:8 E+ G%P B!18 8:
2、-C 2e#9 Note: 8 E:48t G8 =97 FF7 957%L+ , FG P-P Program .Bd# GMW15170 8p) $4=F7 957F$ . Copyright 2012 General Motors Company All Rights Reserved February 2012 Originating Department: GM Korea Engineering Standards Page 1 of 8 Version : 3 1 Introduction Note: Nothing in this standard supersedes app
3、licable laws and regulations. Note: In the event of conflict between the Korean and English language, the Korean language shall take precedence. 1.1 Purpose. This standard covers materials and performance requirements applicable to metric sizes of Types C and F (EDS-G-1405). 1.2 Scope. It is applica
4、ble also to SEMS employing the respective types of tapping screws. The standard dose not apply to corrosion resistance (stainless) steel except for tapping screws fabricated from SAE 51410 which, when suitably processed, have been found to satisfy the performance requirements of this specification.
5、Caution: Case hardened fasteners may be subject to delayed brittle fracture caused by hydrogen resulting from corrosion. Small amounts of water such as might condense from humid air can cause this type of failure, particularly in the presence of anodic surface coating such as zinc or cadmium plate.
6、Consequently, it is recommended that case hardened fasteners not be used in structural applications. 1.2.1 The primary objective of this specification is to insure that screws form or cut mating threads in materials of construction into which they are normally driven, without deforming their own thr
7、ead and without breaking during assembly or service. 1.2.1.1 Certain limitations on basic material and manufacturing processes have been incorporated because the size and configuration of the parts under consideration make them vulnerable to relatively small variations in chemistry, heat treatment,
8、etc, and because experience has shown that in processing it is difficult to keep these variables consistently “in balance“. 1 P7 :0 : ., E:48 6 $* F84 6# F , )=8# P9 Gm8t -%P 9PE8 )= 987 98= : 4G 8x -L.) 3LFF 0* ,l2PGF6 F$ . 8. 77 86 GM :04 .2P7t )=888 F87 8F $%P : 4G 8x 44F 3L 8$ . 4 7 9 -C 4G 92 M
9、ax. /$4 Min. / 2 Max. /$4 For Screws 0.13 0.25 0.64 1.16 For SEMS 0.13 0.27 0.64 1.71 Note 1: Boron is permitted in range of 0.0005 to 0.0035 weight percent. / :0 1: Boron 8 F7-88# 0.0005 0.0035 % 8$ . 4.1.2 Heat Treatment. Screws shall be heat treated in a continuous carbonitriding or gas carburizi
10、ng system. 4.1.2.1 Tempering Temperature. The minimum tempering temperature shall be 340 E . 4.2 Mechanical and Performance Requirements. 4.2.1 Core Hardness. Screws shall have a core hardness of HRC 28 to 38 when tested as specified in 4.3.1. 4.2.2 Case Hardness. Screws shall have a case hardness o
11、f HR15N83 minimum (equivalent to HRC45 minimum) when tested as specified in 4.3.2. 4.2.3 Case Depth. Screws shall have a total case depth confirming to the following, when tested as specified in 4.3.3. 4.1.2 7(=* . 3A *# 7$2958 A .:G D# 43AG 43B72P 7(=*F$ . 4.1.2.1 BD* 7$ . 2 BD* 7$# 340 E8$ . 4.2 d
12、95 -C 2e# 9 . 4.2.1 4 . $ . 3A *# 4.3.1F7 9I%P $4) 4G F 4.3.6 7$2e4G . 2 F 3A * G%P 10 5Dd /H)8! dA 95$-F Gt7 184A$ . +8t )? 3A * :.($ 0.5 1.0 mm (0.020 0.040 inch) 6 F$ . 3A * +l*8 F. E+8 3A * 7 3L:F +7 $4F7 10) 75 DF%T &: 3A * +l*8 9I17 6 F:E8x 2 4F$ . 4.3.7 3L2 ?2e4G $.F !118x J# 3A *72P $4 -,Fp?
13、 l87 F$-F# 2 3D82P % * 9P)Fd 88F Fx7F +A -6* 7t2 D# 3D82P 6x(7 .4958p) 7t2 (3A * A d7 8?F# A d8 GM Korea d3TE:47 !A! $4) I8 -,Bd4 D7t2 )* 17F$ . !118 6# .8 8# h 3A *8 7 , 98= !118 4G DD % !7 +,p*#: G8Fd 88F 6# 9I$8 )88 8# !8 67$I8 3D82P! -6* 7t2 D# ?7Bd2eA 3D82P* 17F$ . 4.3.7.17 2P3T%P $4) B*A 8 80
14、%7 18 F# B*A ) 3A * 98$ . 3A *# 24 48 % 6| 97 : 1B) 8T:4P6 F$ . ,* !2P 8( ?2e 4G B*A * $4 4F F= B*A * :06 3A * F9PF$ . 3A *8 D2 :# 666 F$ . 4.3.7.1 D2 B*A . D2 B*A # 4.3.7 F7 2X+%P $4) +l* -E7 7t2 D# 3D82P* F =F &7 2 5 P8 3A *4 D2%T &: 988p)4 66: B*A 8 D 4G F866 F$ . (: , 3A *4 % 818p) D2%T &: ). 4.
15、4 *A . 2.9 mm 818 )? :8x J# 8 -C +8 +l* 3A * 9P7F +& -,Bd4 3A *# !1 9P988 E47t F 3_8 2 ) 75 958p) )k8 E4%L66 F$ . 3A * +l* 9I17 E4F7 E4# 2F 0.1 mm .0)F6 F+ , “8# 6x(* &d(6 F$ . Screw Size (mm) / 3A * A d (mm) Height of Symbol (mm) / dGl “8 (mm) 2.9 1.2 min 3.5 1.4 min GM KOREA ENGINEERING STANDARDS
16、EDS-T-7035 Copyright 2012 General Motors Company All Rights Reserved February 2012 Page 8 of 8 Version : 3 Screw Size (mm) / 3A * A d (mm) Height of Symbol (mm) / dGl “8 (mm) 4.2 1.4 min 4.8 1.5 min 5.5 1.5 min 6.3 1.5 min 8.0 2.3 min 9.5 2.3 min The letters Metric may be used instead of the numeral
17、 2, at option of the manufacturer. Metric screws shall not be marked with radial line symbols. 5 Provisions for Shipping 6 Notes 6.1 Glossary. Not applicable. 6.2 Acronyms, Abbreviations, and Symbols. Not applicable. 7 Additional Paragraphs 7.1 All parts or systems supplied to this standard must com
18、ply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: EDS-T-7035 9 Release and Revisions This standard was originated in December 1995. It was first approved by Engineeri
19、ng Standard Committee in December 1995. It was first published in December 1995. 9P987 &d( ,l8 “Metric”8x 3_8 2 $447 17F 3L 8$ . -,Bd 3A * -12T dGl7t F E4%L62T 6| %P$ . 5 2T957 $4F 9F 6 768 9I8 6.1 98,l 76 . F$-1F 68 . 6.2 66 -C dGl . F$-1F 68 . 7 .4 1F 7.1 ., E:47 9P4%P +& .E&0 43B8t GMW3059 (8TF,p
20、: 179P )8 9P* &d(6 F$ . 8 Ed - $* ,l2P! $+ &%72P ., E:48 87%T &# $80 M8 EdF$ . EDS-T-7035 9 9P9I -C P9I 8)Y ., E:48t 1995“x 1287 E:4 -Gl4 .7 %L6 , d3TE:41,h7 8F 1995 “x 12 87 38%L6$ . ., E:48t 1995 “x 12 87 ) 9P9I / -PF%L6$ . Issue / P9I8)Y Publication Date / 38 88 Description (Organization) / 9PP9I76 (:04.2P ) 3 FEB 2012 Apply new Engineering Standard Template. Superceded (Corrosion / Metallurgical Material Lab Team) / 4 d3TE:4 64 957 . F9I957 =* (28*4G D4 )
