Koch Stainless chucks

The chucks of the DBF-series are not suitable for applications with high requirements on clamping force. Therefore the chucks are not suitable for turning or milling (exceptions might be micro turning or milling). Our chucks are specifically designed for low clamping forces but highest demands on accuracy.

The standard jaws are made of made of a hardened stainless steel, which is magnetic. But non magnetic jaws made of bronze are available. The material of chuck body and the clamping ring is depended on the chuck type. Please contact for further information. 

Yes, but note that the jaws are hardened to HRC54+2.

Yes, but we need the corresponding chuck for this. Each jaw must be ground in the chuck it will be used in, in order to get a good radial runout.

To ensure the chucking characteristics, a suitable lubricant must be used. We recommend: 

For standard and underwater applications:  

• AGIP GR Mu EP 2 (grease based on lithium soap base with additives) 

For usage in vacuum: 

• Fluoronox MS30/2 (grease based on Perfluoropolyether und PTFE)

Option 1 - alignment by hand

The most simple way of mounting the chucks is by using an even surface with threaded holes on the correct bolt circle. The chucks then needs to be aligned. Therefore a testing pin needs to be clamped. Then the radial run-out must be corrected carefully using a lever arm test indicator.

The surface should have the following diameter:

Option 2 - alignment via tap

The other option is to use a diameter for alignment like shown in the following picture:

Each chuck has a corresponding diameter for alignment on its backside as shown here:

The tap of the fixture should preferably has the following size:

Please note that best results can be achieved when the tap diameter is fitted individually to each chuck. The adaptation of the chuck is a crucial part in achieving a minimal radial run-out.