Hitachi HV-D30 - Manual (Page 22)

Camera mounting
The camera is provided with threaded screw holes at the top and bottom. These allow
mounting to either a tripod or a mounting bracket.
Screw type
U 1/4-20
Length: 4.5 to 6 mm
Screws longer than 6 mm can cause internal damage, while less than 5
mm prevents secure fastening and risks dropping to cause damage and
injury.
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