ER Collets
ER Collets are the most popular and widely used collet. Developed by Rego-Fix in 1973, the ER collet derived its name from the already established E-collet with the first letter of their brand Rego-Fix. These collets are manufactured in a series from ER-8 through ER-50 with each number referring to the bore in millimeters. These collets are only used with tools that have a cylindrical shaft such as endmills, drills, thread mills, taps, etc.
ER Collets are the most popular and widely used collet. Developed by Rego-Fix in 1973, the ER collet derived its name from the already established E-collet with the first letter of their brand Rego-Fix. These collets are manufactured in a series from ER-8 through ER-50 with each number referring to the bore in millimeters. These collets are only used with tools that have a cylindrical shaft such as endmills, drills, thread mills, taps, etc.
ER collets have some clear advantages over traditional set screw holders.
- Runout is much lower extending tool life
- Increased stiffness provides better surface finish
- Better roughing abilities due to increased stiffness
- Self-centering bore
- Better balance for high speed milling
- Holds the tool more securely
ER collets have some clear advantages over traditional set screw holders.