Various Joint Screws

GQ-10-0 serves as a T-shaped nut utilized for securing the lower attachment.
Joint screws are designated as GQ-10-1 through GQ-10-4 and GQ-30-1 through GQ-30-3.
Universal joints are identified as GQ-20-1 and GQ-20-2.
Pin joints are labelled as GQ-31-1 and GQ-31-2.

Type	Screw diameter
GQ-10-0	M8
GQ-10-1	M6(M)×M6(M)
GQ-10-2	M12(M)×M6(M)
GQ-10-3	M12(M)×M10(M)
GQ-10-4	M12(M)×M12(M)
GQ-20-1	M6(F)×M6(F)
GQ-20-2	M12(F)×M12(F)
GQ-30-1	M6(F)×M6(F)
GQ-30-2	M12(F)×M12(F)
GQ-30-3	M12(F)×M10(F)
GQ-31-1	M6(F)×M6(F)
GP-31-2	M12(F)×M12(F)

You can download the jig drawing by clicking the drawing image above.