The UNILOCK SMH COLLETS are made up from metal inserts, units of vulcanised rubber. This allows the collet to close radially in a perfect manner, blocking the piece along the entire length of the hole and eliminates the intrusion of shavings to pass inside the spindle.Applied to the lathe main spindle it is suitable for bar machining. Moreover, the construction flexibility of the system allows easy specific solutions (drawn bars, rectified items, rolled items, pipes).

“QUICK CHANGE” COLLETS The system allows a fast front removal of the collet. In this way, replacement or disassembly collet cleaning operations result easier and quicker, without dead times.
All UNILOCK SMH collets are COMPATIBLE with original HAINBUCH collet-chucks.


• Excellent elasticity
• Reduction of vibrations
• Less tool wear
• No wear on the collet
• Does not mark the surface of the piece
• Quick collet change
• Fewer machine downtimes


Collet closure with tapered coupling
The Unilock SMH Collet has closure with TAPERED COUPLING.
This feature allows each individual sector of the collet to close radially, tightening the piece along the entire length of the hole and developing a clamping force that is 5 to 10 times greater with respect to “traditional mono-cone” collets which only close on the front edge.
Excellent elsticity
Thanks to its high elasticity, the Unilock SMH Collet is adaptable to the imperfections of the bar to be clamped. Suitable for machining rolled, forged and cast elements.
Reduction of the vibration
The strong clamping force of the Unilock SMH collet greatly reduces vibrations and resonances.
Does not mark the surface of the piece 
During the clamping phase, thanks to the use of a fixed collet closing system (as jaws of self-centering) the bar or the piece is not scratched or marked by the collet.
Fewer machine downtimes 
The Unilock SMH Collets do not have cuts.
This feature makes it almost impossible for dirt to form inside the spindle.
UNILOCK pneumatic extractor
Quick and easy collet replacement.


The UNILOCK SMH – MD COLLET as well as maintaining the basic features, it has an interior “rough” coating with high friction coefficient, which increases the clamping force even further.

The “dynamic friction coefficient” is determined on the basis of the roughness present inside the collet and must be considered according to the type of material to be machined (e.g. stainless steel, steel, brass)

Unilock collets pulling force Unilock collets pulling force table