标准编号:	GB/T 12-1988
中文名称:	半圆头方颈螺栓
英文名称:	Cup head square neck bolts
行业分类:	GB    国家标准
发布机构:	中国机械工业联合会
发布日期:	1988-6-24
实施日期:	1989-7-1
标准状态:	superseded
被新标准替代:	GB/T 12-2013 圆头方颈螺栓
被替代日期:	2014-3-1
翻译语言:	英文
文件格式:	PDF

1 Subject Content This standard specifies that thread specification shall be M 6~M 20 step bolts of C level. Notes: varieties of commodity fastening pieces shall be given priority. 2 Normative References GB 196 General Purpose Metric Screw Threads-Basic Dimensions GB 197 General Purpose Screw Threads-Tolerances and Fits GB 2 Fasteners-Ends of Parts with External Thread GB 3098.1 Mechanical Properties of Fasteners-Bolts, Screws and Studs GB 3103.1 Tolerances for Fasteners--Bolts, Screws, Studs and Nuts GB 5267 Electroplated Coatings on Threaded Fasteners GB 1237 Designation System for Fasteners GB 90 Acceptance Inspection, Marking and Packaging of Fasteners 3 Dimensions See the following drawing and Table 1 for the dimension.