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There are two types of camera release screws: parallel screws and tapered screws. Both Tap (M3.4x0.5) are special.
gauge is also a special product, but the external thread is only a tapered screw, and the taper (slope angle of 14°) is too strong to produce a ring gauge . (Only plug gauge can be manufactured)
JIS B 7104 Camera Release and Mounting Parts
You can search for the standard from the link below.
・Japan Industrial Standards Committee website JIS search
(FAQID:299)