Slim Chuck (SK)

The NIKKEN Slim Chuck is our standard and precise collet chuck solution.

The construction consists of three components – the main body/shank with fine, molybdenum coated, external ground thread and internal collet bore, an external clamping nut with unique TiN bearing, fine internal coated ground thread and finally a precision collet. Both the collet and the body feature a highly accurate 8 degree taper. Competitor solutions (ER systems and the like) are normally based around a 16 degree collet taper so in reality provide less that half the accuracy and gripping capability of the Slim Chuck.

Operation is very simple. The collet is loaded into the nut before the two parts, now ‘as one’ are screwed onto the main/body shank of the holder. The cutting tool is then loaded into the bore of the collet at the required length before tightening in a clockwise direction. Normally starting by hand, and then with the appropriate wrench, this rotation moves the nut up the thread of the holder and, very effectively and precisely, collapses the collet to grip and retain the cutting tool. It is straight forward and common sense to appreciate when the Slim Chuck is tightened correctly, however, should it be preferred, torque wrenches are available to achieve our absolute recommended tightening torque for each size of Slim Chuck.

The Slim Chuck is available to suit all processes with numerous shank sizes, lengths and configurations available. The Slim chuck body shape is avalable in two configurations: Standard parallel SK and externally tapered SKT. These two forms allow versatility to suit most applications and requirements.

The scope for the Slim Chuck can also be extended to NIKKEN's Multi-Lock Milling Chuck by using the 'straight shank' Slim Chuck in conjunction with a Multi-Lock which, in this case, then becomes a rigid and reliable base holder.

As is common for several products the standard Slim Chuck features a notched nut requiring a flat/hook type wrench and the ‘high speed’ variant is smooth too suit the ‘GH Handle’ roller bearing wrench. Unlike the Multi-Lock the Slim Chuck absolutely requires a collet. A collet first requires selecting and loading into the nut (direct chucking is not possible).

Slim Chuck, depending on tool shank, is available in 6 sizes:

• SK6 - to suit diameters 0.7mm to 6.0mm.
• SK10 - to suit diameters 1.75mm to 10.0mm.
• SK13 - to suit diameters 2.75mm to 13.0mm.
• SK16 - to suit diameters 2.75mm to 16.0mm.
• SK20 - to suit diameters 3.5mm to 20.0mm.
• SK25 - to suit diameters 7.5mm to 25.4mm.

The Slim Chuck currently has 4 types of 8 degree collet available to select from to hone and fine tune both accuracy and coolant control. They are:

• Standard Collet - Example SK16-16 (Maximum 0.5mm collapse & 5 microns accuracy).
• Precision Collet - Example SK16-16P (Maximum 0.5mm collapse & 3 microns accuracy).
• Milling Collet - Example SK16-16A (No collapse & 3 microns accuracy).
• NEW Mechanically Sealed Coolant Collet - Example SK16-16AC (Designed for coolant hole cutters. No collapse & 3 microns accuracy).

The standard, precison and milling SK collets can also be used in conjunction with our 'Jetter' system. By selecting the appropriate optional 'Jetter' nut and cap it is possible to control the coolant supply to suit your specific process - depending on the cutter type and requirement.