K&M 21920

I use these to mount small video cameras and a digital recorder onto mic stands, which are much less obtrusive than a camera tripod for the audience at a performance.

A minor but annoying problem is that the 1/4" thread is way too long for the attached equipment. The screw bottoms before the shoulder of the adapter can rest against the baseplate of any camera or recorder I have tested. This makes the attachment flimsy and unreliable.

The thread is 9.85 mm long, while the applicable standard, ISO 1222:2010, stipulates that tripod mount bolts should be 4.5 mm long.