Table of Contents
What size is 5C collet?
5C Collets- Hardened and Ground Collets in round sizes are 1/16″ to 1-1/16″ in 1/64″ increments, or 3mm to 26mm in 1mm increments; 5c square and hex collet sizes are 1/8″ to 11/16″ in 1/16″ increments.
What are ER collets?
An ER mill collet is a cnc tool holder for endmills, drills etc in a mill. They can also be used in a small micro lathe in the place of a chuck to clamp the workpiece. The ER collet system consists of a main shaft or body with a threaded end, a nut, which screws onto the main body and interchangeable collets.

What does ER mean in collet?
In 1980, the company officially adopted the Rego-Fix name, using “Rego” from the city of its founding, and “Fix” simply meaning to fix things. The R in “ER collet” stands for Rego-Fix, representing the company’s modification to the E collet design.
What size is a 5c Collet?
5C Collets- Hardened and Ground Dunham Tool precision 5C collets are available in both inch and metric sizes. Collets in round sizes are 1/16″ to 1-1/16″ in 1/64″ increments, or 3mm to 26mm in 1mm increments; 5c square and hex collet sizes are 1/8″ to 11/16″ in 1/16″ increments.

What is the size of a round Collet?
Collets in round sizes are 1/16″ to 1-1/16″ in 1/64″ increments, or 3mm to 26mm in 1mm increments; 5c square and hex collet sizes are 1/8″ to 11/16″ in 1/16″ increments. These collets can be used with Dunham Tools standard 5C collet fixtures and spindles as well as other manufacturers’ R8 and 5C fixtures.
Can Dunham collets be used in other manufacturers’5C collets?
These collets can also be used in any other manufacturers’ 5C collet fixtures, 5C spindles, etc. Dunham Tool collets are designed for precision workholding applications that require holding a workpiece on an outside diameter.
How to choose the right Collet?
Choose from collets that can grip round -, hexagon -, or square-shaped workpieces. Also known as emergency collets, these collets have a machinable face for boring an opening to the exact size and shape you need.