GB/T 6559-1986 English PDF (GBT6559-1986)

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GB/T 6559-1986: Screw thread shanks for thread forming screw. Metric coarse thread series
GB 6559-86
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC 621.882
Screw Thread Shanks for Thread Forming
Screw – Metric Coarse Thread Series
ISSUED ON. JULY 2, 1986
IMPLEMENTED ON. MAY 1, 1987
Issued by. National Bureau of Standard
Table of Contents
1 Introduction... 3 
2 Normative References ... 3 
3 Dimensions... 3 
4 Dimensional Inspection ... 6 
5 Marking ... 7 
Additional Instructions... 7 
Screw Thread Shanks for Thread Forming
Screw – Metric Coarse Thread Series
1 Introduction
This Standard applies to the thread forming screws of metric coarse thread series and
thread specification M2 to M12.
The screw thread shanks for thread forming screw have threads of arc-shaped
triangular cross section, as shown in Figure 1. The screw is hardened on the surface;
it can be screwed in the pre-drilled holes (made by drilling, punching or pressure
casting) of ferrous or nonferrous metals; and it forms internal thread by tapping.
The thread forming screw shall be possessed of low screwing-in torque and high
locking performance.
Figure 1
2 Normative References
GB 196-81 General Purpose Screw Threads - Basic Dimensions
GB 197-81 General Purpose Screw Threads – Tolerances and Fits
3 Dimensions
3.1 The types and dimensions of thread shall be as specified in Figure 2 and Table
1.