Standard No.:	GB/T 12-1988
Chinese Name:	半圆头方颈螺栓
English Name:	Cup head square neck bolts
Professional Classification:	J13 Fastener
Professional Classification:	GB National Standard
ICS Classification:	21.060.10
Issued by:
Issued on:	1988-06-24
Implemented on:	1989-07-01
Status:	ABOLISHED
Replace By:	GB/T12-2013 Cup head square neck bolts
Replace By Date:	2014-03-01
Language:	English
File Format:	PDF
Word Count:	1500 words
Price(USD):	45 (USD)
Delivery:	via email in 1-3 business day

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.