PwnCNC has a bunch of extra collet nuts available. Our spindle motors will use either ER11A or ER20A nuts.
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.
Great product, need 2 one for 1/8 and 1/4 inch faster nut bit change out.