GFB Collet ER32 4 mm

The GFB Collet is ER32 series, clamps a 4 mm shank. A collet is a slit sleeve that grips the tool shank all the way round: tightening the holder's nut closes it and centres the tool. The series (ER8-ER40, OZ) is the collet's outside size, the second figure the shank diameter it closes on. Used to hold tools in milling machines, CNC and die grinders. A collet closes to roughly 1 mm under its nominal size; forcing it past that adds runout and permanently deforms the collet. Seza Global supplies GFB collets and holders wholesale. Request a quote for stock, pricing and delivery.