Indexable Boring Tool permits small-hole rough boring.

Press Release Summary:

With boring range of 16–21 mm diameter, MW Boring Tool is suited for semi-finish boring operations of workpieces with die cast holes. Product is built with 20 mm diameter straight shank and performs best when paired with milling chuck at fixed bore depths up to 4 x D. Spiral groove carved into body facilitates clean chip removal with help of coolant holes near end of groove. For blind-hole situations, additional center-through coolant option was added.

Original Press Release:

BIG Kaiser Expands Small Diameter Rough Boring Offering

Hoffman Estates, IL – BIG Kaiser Precision Tooling Inc. introduces a new small-diameter indexable rough boring solution for a range not previously available. The new MW boring head permits small-hole rough boring in a range of Ø16mm-21mm (Ø630”-.827”) and is ideal for semi-finish boring operations of workpieces with die cast holes.

Unlike other boring tools from BIG Kaiser, the new MW does not feature the modular KAISER KA/KAB connection. Built with a Ø20mm straight shank, the product performs best when paired with a milling chuck at fixed bore depths up to 4xd.

Efficient chip evacuation was a major consideration in the design of this tool. A spiral groove carved in to the body facilitates clean and quick chip removal with the help of coolant holes near the end of the groove. However, for blind-hole situations, an additional center-through coolant option was added to aid in chip evacuation for this tricky scenario. Simple stop screws makes choosing coolant preferences fast and easy.     

The two opposing die-steel insert holders feature a precision serrated mounting system, providing a secure and rigid connection similar to the KAISER 319 SW series. The insert holders are conveniently marked with a scale for coarse setting, and the radial adjustment screw allows for fine-tuning thanks to its .008” pitch. Coated inserts are available for common materials like steels (including stainless), ferrous materials such as ductile and cast iron, as well as non-ferrous materials like aluminum.

BIG Kaiser Precision Tooling Inc. is a leader in high precision tooling systems and solutions. With brands including BIG Daishowa, KAISER, Speroni, Unilock, Sphinx and more, BIG Kaiser’s line is focused on extreme accuracy and repeatability. BIG Kaiser’s mission is to support North American manufacturers with products that are designed and manufactured to a superior standard. Guaranteed.

For more information, contact BIG Kaiser, Hoffman Estates, IL at 847-228-7660, e-mail or visit

Contact: Tim Stapula

Marketing Manager

BIG Kaiser Precision Tooling Inc.



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