Router Collet question

[UncleJoe]

I have a Bora PM-P254 Router in my router table. I would to have extra collets but I can't find them. When Bora made the newest version of this router they used the standard ER 20 collet and Nut that can be purchased anywhere. There is no identification on the nut but an ER20 nut is not threaded the same and will not fit ( I tried). In my sniffing around the internet I can find very little information, some have guessed that it might be the same as the larger porter cable nut but I can't get verification on that. It would be great if Bora would just answer my email and tell me where I can buy a collect and nut or even what it is compatible with but they have not responded to my email.

I figured I would ask here incase someone had experience with this.

Thanks

 

[bob vaughan]

I duplicated a 690 shaft once. My notes say .975 x 20. I'd guess that it is a 1"x20.
Get some machine screws and match the threads on the shaft. A 1/4-20 bolt will be fine for determining the thread pitch. Metric screws will work for the various metric threads. A thread gauge would be nice but I doubt if you have one readily available.