GFB Collet Nut ER20 M Type

The GFB Collet Nut is ER20 series, is the M nut type. A collet nut clamps the collet into the holder; the eccentric ring inside both draws and extracts the collet, so the nut has to match the collet series. UM is the standard hex nut, M the mini nut for smaller holders. Bought to replace a worn, cracked or missing nut. An unbalanced nut causes runout and vibration at speed; a balanced nut is preferred on CNC. Seza Global supplies GFB collets and holders wholesale. Request a quote for stock, pricing and delivery.