PwnCNC has a bunch of extra collet nuts available. Our spindle motors will use either ER11A or ER20A nuts.
If you're looking for collets... checkout our ER Collets and ER High Precision collet sets options.
Our black collet nuts are all balanced at a standard 14,000 RPMs. This is perfect for woodworking, acrylic, and other low-precision projects.
If you're getting into metalworking... then you'll love our silver collet nuts which are balanced at a whopping 18,000 RPMs. These are the same collet nuts included in our High Precision collet sets.