Chuck key compatibility?

PT Doc

Active User
Registered
I have a 5/8" no name chuck on my floor drill press. The chuck key is not labeled. I just bought a Jacobs super chuck 16n that is the same 5/8" capacity. The key according to Jacobs for this chuck is a k4. Both chucks are for a jt3. I don't have all the pieces in the same location at this time or I would check for myself.


Since the chucks are almost identical, would the keys be interchangeable? Any specific measurements that I could take on the keys that I have to confirm that the keys are indeed k4?


Thanks for the help.
 
Tried a 3/8" drill bit shank and it almost fit. I ordered a Jacobs k4 key. I don't want to bugger nice chuck up.
 
Back
Top