Collet Life Span Collets have a life span of 400-600 hours, which roughly translates to between two and three months with the collet being used eight hours a day. When inspecting your collet, metallic damage, such as bell mouthing or burrs, should be checked with every tool change.

R8 collets are designed for use in milling machines. Unusually, R8 collets fit into the machine taper itself (there is no separate chuck), and tools with integral R8 taper can also be directly fitted.

The manufacturing process of collets is a complex and intricate one that requires precision, expertise, and attention to detail. The first step in creating a collet involves selecting the appropriate material based on its intended use. Materials commonly used for collet manufacturing include steel, brass, and aluminum.

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.