An R8 collet is a specialized clamping device used in machining and milling. It is designed to hold workpieces securely in place, allowing for precise cutting, shaping, and drilling operations. The “R8” designation refers to the taper size of the collet, which is commonly found on milling machines.

The standard series are: ER-8, ER-11, ER-16, ER-20, ER-25, ER-32, ER-40, and ER-50. The "ER" name came from an existing "E" collet (which were a letter series of names) which Rego-Fix modified and appended "R" for "Rego-Fix". The series number is the opening diameter of the tapered receptacle, in millimetres.

R8 Collets in round sizes are 1/16" to 7/8" in 1/32" increments, or 3mm to 22mm in 1mm increments. Our R8 Collets allow for more rapid tool changes, and provide an inexpensive and accurate tool holding method.

ER32 series collets have a capacity of 1mm-20mm. Each ER32 collet has a range of (1 mm). The size indicated on the collet is the largest size it can hold and can be collapsed smaller within its collapse range of (0.9mm). For example, ER32-6mm can grab a round shank from 6mm diameter to 5.1mm diameter.