Allan, from measurements of a bolt that I have that fits, the thread diameter is 6mm and pitch is 1.3mm. After a google search I have found it to be 1/4 inch 20TPI
Quote:
Tripod mount.
A threaded socket in the base of most cameras to which a screw can be attached.
These sockets are used to attach camera bodies and lenses to tripod heads, flash brackets, monopods, etc. They come in two sizes - 1/4 inch (with 20 threads per inch pitch, or 1/4-20) for smaller cameras such as nearly all 35mm cameras and 3/8 inch (with 16 threads per inch pitch, or 3/8-16) for larger cameras. Even most European and Japanese manufacturers use these non-metric sizes for historical reasons, though tripod mounts with incompatible thread counts are sometimes found on European and Russian equipment.
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