Reliable slit design ensures high accuracy

A unique BIG slit shape is adopted to achieve both the essential
runout accuracy and gripping force which are the key elements of a milling chuck. Stable clamping is possible due to sufficient elastic deformation and the ability to remove oil film from the tool shank.

HMC12J Type – Clamping diameter: ø12

• Slimmer nut diameter of ø32 reduces interference.
• A nut shape slimmer than collet chucks
• Peripheral coolant supply to cutting edge.

The Milling Chuck is also ideal as a basic holder

• Allows the reliable use of straight collets as well as boring bars, arbors such as face milling cutters. Also optimal as a basic holder

Runout Adjustable RA Holder

• Tool edge runout 2µm or less.
• Compensates for increased runout of machine tool spindles caused by extended use. Simple structure allows for easy adjustment in the machine.
• Simple structure allows for easy adjustment of runout accuracy!

The unique Key Grip locking mechanism prevents the tool from slipping or pulling out during heavy machining

Simple and easy handling with secure clamping
(1) Place the Key Grip onto the flat part of the endmill.
(2) Set the spring into the bore of chuck, then insert the endmill in alignment with the groove.
(3) Rotate the endmill and set the stopper pin.
(4) Clamp the tool until the nut contacts to the chuck body completely

Non-Pullout mechanism

The Key Grip engages in the groove of the chuck body to ensure no tool pullout.

Non-Slip Mechanism

The Key Grip maintains contact with the Stopper Pin to prevent any slip.

Complete fit of nut and body

Flood jet through coolant