C-mount		d=1"	tpi=32		flange-distance=17.526mm
CS-mount	d=1"	tpi=32		flange-distance=12.5mm
S-mount		d=12mm	pitch=0.5mm	flange-distance=unspecified
T-mount		d=42	pitch=0.75mm
X-mount		d=10mm	pitch=0.5mm	flange-distance=unspecified 
Schmidt		d=50mm	pitch=1mm	

http://www.mapug.com/ragreiner/adapters.html#Flanges
http://www.a1.nl/phomepag/markerink/mounts.htm