ER-40 collets are 1.62" (41.15 mm) maximum diameter and 1.81" (46 mm) long. They have a clamping range of 1/8" to 1" (3.0 mm to 26.0 mm).ER collets are made from high grade tool steel, hardened and ground to close tolerance. Kerf cuts allow the collet to expand and contract as needed within the specific clamping range to securely hold the tool or workpiece.*Collet must be assembled into a collet chuck nut before inserting into the collet chuck.
