This Korean Industrial Standard specifies basic profile, formulae and basic dimensions of general purpose metric coarse screw threads. In addition, the requirements of screw threads of M1.7, M2.3 and M2.6 shall comply with the Appendix. Remark The basic profile, designation of screw threads and basic dimensions specified in the text of this standard shall comply with the following standards of ISO. Basic Profile : ISO 68 (ISO General Purpose Screw Threads-Basic Profile) Designation of Screw Threads : The coarse screw threads specified in ISO 261 (ISO General Purpose Metric Screw Threads-General Plan) Basic Dimensions : The basic dimensions of coarse scre in ISO 724 (ISO Metric Screw Threads-Basic Dimensions)