DIN6343 Compression Collets are mechanical devices primarily used in machining centers and CNC lathes for clamping bars or workpieces during machining operations.

Operation and Applications

• They rely on a self-centering chuck mechanism that applies uniform pressure to the bar or workpiece.

• They are ideal for high-precision operations such as turning, milling, cutoff, and grooving.

• They are used in CNC lathes, automatic machines, and special chucks.

Advantages

• High repeatability and concentricity, with minimal runout errors.

• Stable grip even at high machining speeds.

• Made of hardened steel to resist wear and thermal variations.

• Suitable for materials such as steel, aluminum alloys, brass, titanium, and special alloys.

Differences Compared to Other Collets

• Unlike draw collets, compression collets clamp from the outside inward, ensuring greater rigidity for heavy-duty machining.

• Often preferred in high-production machines due to their durability and reliability.

Our bar-pulling collets feature a custom internal profile that provides a higher clamping force than standard market collets. This modification ensures a constant closing force distributed evenly across the entire clamping surface. Since the load is uniformly distributed over the entire cylindrical clamping surface, the collet offers significant advantages in holding force, not only at the front but especially in radial load resistance.

A common issue in automatic machines occurs when machining a workpiece with radial profiling tools while simultaneously using front drills: the collet tends to open due to the radial load generated by the profiling tool. Meanwhile, the drill pushing along the workpiece axis facilitates the bar’s backward movement. Our design prevents this, ensuring superior stability.

The collets are supplied according to the available profiles, if you need a specific profile, please write to us by clicking here.