Identify THK ballscrew

I have a

THK
BTF 1404C

ballscrew with nut

I have found out the 1404 means 14mm dia and 4mm pitch.

Want to know what BTF means and C.

I am trying to figure out if this is ground or rolled and if it is
preloaded. The ballnut looks and measures the same as the BTK series
but this one has no wipers built in. The look alike BTK is here.

http://www.thk.com/products/ballscrews/btk.htm



Wally K.