I was told that the F stands for Finishing, other places say that it means Full (as in not a skip tooth). FC is full cut or finishing cut. Basically the same thing, however sometimes you will notice that the mm listed on the blade is different. For example i have a Buttercut 5F that is 6mm and an Andis 5FC that is 6.3mm. I prefer the 5F because it gives a nicer, smoother cut. The skip tooth blades are used for bulk trimming, and they are easier to cut a dog with if you don't know what you are doing.
On yorkies that are getting short puppy coats i use either a 5F or a 7F all over. These are especially nice on cotton coats. I usually use a 7F on Morgan all over except her head, which i use thinning shears to give her a round head.
The 7F cuts hair to 1/8 of an inche and the 5F does 1/4 of an inch.
__________________ Kellie  and  Morgan |