Why is the nose of my 5C Collet Chuck threaded?

[Cartierusm]

Title explains it all. Why is the nose of my 5C collet chuck threaded? Must have a function? My chuck is a power chuck.

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[mactec54]

Title explains it all. Why is the nose of my 5C collet chuck threaded? Must have a function? My chuck is a power chuck.

Post a photo, it depends on the chuck type and manufacturer, it could be just for the Collet closer for the large 5C collets 2" or larger there is a ring with a taper that screws on to the nose and the large collets are closed by this

[Cartierusm]

Here's a pic. Believe it or not there isn't one single mark on it at all, so I have not idea who the manuf is. Also what are the two threaded holes on the sides for? They go all the way through.

[steryd]

Side holes are for oiling. You can thread short screws there to prevent from dust.
Thread on the back of the collet is for older type of chuck.

[Cartierusm]

@steryd what do you mean by "Thread on the back of the collet is for older type of chuck." I was asking what the thread on the nose of the collet chuck is for.

[mactec54]

Here's a pic. Believe it or not there isn't one single mark on it at all, so I have not idea who the manuf is. Also what are the two threaded holes on the sides for? They go all the way through.

They have a cap that screws on to protect it, there will be a 2-3/16 x 10 TPI if it is standard, some manufactures are still making these 5C type chucks with a threaded nose Bison below is a good example

the screw hole in the side of your one is most likely for the Key to stop the collet turning

[Cartierusm]

Kinda what I thought. Thanks.