SK Collet Chucks

Due to Nikken’s special heat treatment, grinding, and custom slotting process, we can guarantee a 5-micron runout tolerance for our “on size” fractional and metric size precision collets.

Some common challenges that manufacturers face when machining can be short tool life, poor part quality, or poor surface finish on a workpiece. The design features of the SK collet chuck can help solve those problems.

The uniquely designed gold ring reduces collet damage, reduces micro vibration with the collet flange, and eliminates friction with the collet. It improves the cutting rigidity and the quality of the cut compared to traditional collet chucks.

Narrow Body Provides Better Clearance

Allows access to tight spaces and provides better clearance.

Taper Angle Provides Increased Gripping Power

The SK’s 8-degree collet seats deeper in the body of the holder, providing double the clamping force and precision than traditional 16-degree collets.

Comparison of Design Features

The illustrations below show a side-by-side comparison of the design features, and effects they can have on machining, between the design of the Lyndex-Nikken SK collet chuck versus other tool holders. The Lyndex-Nikken SK collet chuck provides high machining accuracy due to flat shoulder pushing. This is achieved with the combination of the simple and rigid Titanium Nitrided (TiN) Bearing Nut and 8-degree taper. Other tool holders have designs that result in taper shoulder pushing that results in unstable runout and poor gripping torque. Reason being is that they have a complicated nut that changes the balance of the tool holder during high-speed rotation. Additionally, their wider-angle collets can misalign causing poor runout and gripping force.

Watch Video: SK Collet Chuck Improves Machining

Watch this video to hear more about how machining with the SK collet chuck improves machining versus using other toolholders.

With over 1 million SK collet chucks and over 15 million SK collets sold worldwide, the SK is proven tool holder technology that manufacturers prefer due to the advanced design that consistently performs – here’s why:

• Lean – narrow body design allows access to tight spots
• Versatile – applicable for all milling, drilling, reaming, and rigid tapping applications
• Flexible – covers sizes from 0.028” to 1”
• Accurate – 2x more accurate than ER collet chucks, within 10x better repeatability
• Extremely Precise – 0.0002” or less concentricity guarantee with on-size collets
• Double Gripping Power – with an 8-degree collet taper, the SK collet chuck has double the gripping power over ER collet chucks

• Outstanding runout accuracy for longer tool life
• Vibration dampening for increased productivity
• High rigidity for smooth and stable cutting

SK collet chuck is ideal for use with coolant thru tools (when coolant nut is paired with the coolant-thru slotted disk) as well as non-coolant thru tools (when coolant nut is paired with the slotted disk).

Every machining application is unique and requires toolholders that are designed to enable the desired performance. When deciding between an SK collet chuck versus an ER collet chuck, manufacturers should consider these critical points:

See and hear more about why the SK collet chuck out performs the ER collet chuck in this video.

Below is a comparison of three popular collet chucks that show key features and which processes each perform best. All toolholder systems below will typically complete the job, but the key is knowing in advance what precision is required for the application. The greater the requirement for high precision and high productivity, the greater the need for SK collet chucks.

Seeing is believing when comparing machining results from an SK collet chuck vs. ER collet chuck. Check it out!

If you look at the chips from the ER collet chuck, they are frayed and jagged like feathers while the SK collet chuck chips are extremely smooth and consistent. That is an indication that the cutting tool is being pulled out of the ER collet chuck. And if you look at the part, in the ER collet chuck cut passes you will see the chatter with lines on the walls and swirl marks on the floors while the SK collet chuck produces smooth almost mirror finish on walls and floors. Bottom line is with the ER collet chuck you would have to go back and re-cut the part, which is inefficient, but with the SK collet chuck the cut is done right the first time – increasing your efficiency and accuracy. SK collet chucks are 2x more accurate than ER collet chucks, with 10x better repeatability.

Summary – Why SK Collet Chuck Outperforms ER Collet Chuck

• Better Clearance
• Innovative Titanium Nitride Nut (TiN Nut) Design – will not misalign or rock
• Improved Runout Accuracy – improves tool life
• Better Gripping Strength – Allows for greater depths of cut and prevents cutter pull out
• Better Vibration Dampening Characteristics – enables better surface finish and part precision

Watch tool holder videos to hear and see for yourself how Lyndex-Nikken quality products provide optimal machining solutions.