1、 ENGINEERING STANDARDS Material Specification SUPERCEDED EDS-G-1112 Mechanical Properties of Steel Bolts and Screws This standard may be applied only for current projects. It is Superceded for all future projects and replaced by GMW25. I9P .0C7t 88t !18 d95 2e: Note: 8 E:48t G8 =97 FF7 957%L+ , FG P
2、P Program .Bd# GMW25 ) $4=F7 957F$ . Copyright 2012 General Motors Company All Rights Reserved February 2012 Originating Department: GM Korea Engineering Standards Page 1 of 8 Version : 5 1 Scope This standard specifies mechanical properties, test method and indication of the bolts and screws (here
3、inafter referred to as the external screw threaded parts). Remark: The units and values in in this standard conform to the international unit standard (SI) and is for reference. 1.1 Kinds of External Screw Threaded Parts. This standard applies to external screw threaded parts, such as bolts, stud bo
4、lts, machine screws and set screws, regardless of the existence and shape of the head. However, set screws are excluded. 1.2 Types and Nominal Diameter Range of Screw Threads. Basic thread profile, nominal diameter and pitch shall conform to EDS-G-1101 and EDS-G-1102 conforms to 1.6 ) 39 mm nominal
5、diameters. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. KS B0233 KS B0802 KS B0805 KS B0806 2.2 GM Standards/Specifications. EDS-G-1101 EDS-G-1102 GMW3059 2.3 Additional References. TMC003 Material Safety Data
6、 Sheet guidance documents 3 Requirements 3.1 Mechanical Properties. 3.1.1 Mechanical Properties by Strength Class. Mechanical properties of external screw threaded parts by strength class shall conform to Appendix A. 1 P7 8 E:48t .0C -C 88t!1 .E (8F “3L!1 .E “8( F$ )8 d95 2e: , 4G - , E4- 8 88T !1.7
7、 -P2F7 , ,8 +l*6x(8 %4d D# +l*.7 G$4F 8t 9$ . (10) 98 !18 8t , Bd;8 +l*. ;8 9P 117 2$ , +l*.4 /xC)X !6: 68p+ %P$ . (11) ,* 17 &d*$ . (12l# KS B02337 &d* ). GM KOREA ENGINEERING STANDARDS EDS-G-1112 Copyright 2012 General Motors Company All Rights Reserved February 2012 Page 8 of 8 Version :5 Figure
8、1: Decarburizing of Threaded Portion / ,* 1: !1.8 AA (12) It is a layer in the thread skin composed entirely of ferrite with carbon removed. G is the decarburized depth from the pitch line to the surface layer. (13) This portion has some martensite and shows hardness much lower than that of the base metal due to reduced carbon content. (14) It is the screw thread height at Maximum Material Condition. (12) !11 E?i.72P8 A24 24F D(8C +8p) %P ?i8p)2P , G # Fp?2T18 E+ ?i72P.Bd8 AA?i 88 . (13) 688 *B18C4 .(8 , A2* D2 4dd &,l7 2:$4 4=72P8 !118 “88 .
