MTS Chipbreaker Drills

Standard drill in action

Standard drill in action

This outstanding development increases drill cutting efficiency by means of greatly improved chip control. A chipbreaker rib is positioned along the length of the flutes, which curls and breaks long chip forming material into small manageable chips for easier evacuation. There is no clogging of chips in the flutes, as small chips flow freely along the flutes. The chipbreaker drill thus cuts more freely than standard drills.

The small chips also permit coolant to flow more freely to the drill point, giving improved heat dissipation and drilling performance. As the chipbreaker rib extends down the entire flute length, the chipbreaker form and effect is retained even after conventional sharpening. The chipbreaker rib gives added rigidity, markedly increasing the number of holes per re-grind, even where chip control is not considered important.

Chipbreaker Coolant Feed Drills

Chipbreaker drill in action

Chipbreaker drill in action

The benefits of providing coolant internally directly to the drill cutting edge include higher cutting speeds (reduced times by up to 75%), higher feed rates, longer tool life (3 to 10 times), and less frequent resharpening. In addition they provide a superior finish.

The coolant assists in clearing chips from the drill point and it’s pressure forces the swarf along the flutes of the drill facilitating drilling to greater depths without repeated withdrawal to clear swarf.

Coolant tubes or holes are located away from the drill web, thus not affecting web strength. Both variants connect to all coolant systems.

Coolant can be provided by the normal coolant pump supplied with most machines using soluble oil. However, we recommend using a mist coolant at a pressure of 550 to 800 kPa (80 to 120psi). This method is clean and efficient, eliminating the problem of collecting, filtering and re-using the coolant.

Style Variations

Somta offers a range of Morse Taper Shank Chipbreaker Drills, with variations in point angle, HSS grade and coolant feed options.

Point Styles

normal 118° & 130°
The conventional chipbreaker drill point angle is 118° or 130°, which is suitable for the majority of high performance applications. 130° is suitable for harder materials.


Where through-holes are being drilled and there is a requirement for high operational efficiency without the need for deburring on punch-through, we recommend the use of a 170° brad point angle.

Coolant Feed Styles

Normal Chipbreaker Normal Chipbreaker
This is the usual configuration of the Chipbreaker Drill, which has no coolant feed.


Oil Tube ChipbreakerOil Tube Chipbreaker
Coolant is fed through shank cross holes into oil tubes which are inserted into a groove which runs down the length of the flutes. Oil is fed from the tubes at the outer edge of the point diameter directly onto the workpiece, cooling the workpiece and stimulating small chip evacuation. Because the chipbreaker rib breaks up long stringy chips into small pieces there is no chance of chips snagging and removing the coolant tube.

High Speed Steel Material Grades

HSS (M2)
Most chipbreaker drills are manufactured from standard HSS material. HSS chipbreakers have a black oxide steam tempered finish.

HSS-Co5 (M35)
We also offer HSS-Co5 to extend product life even further due to the superiority of HSS-Co5 over HSS. All HSS-Co5 chipbreakers are finished with Gold Oxide surface treatment to differentiate from the HSS steam tempered finish.

Chipbreaker Product Codes & Features


Product Code Coolant Feed Option Material Point Style Flute Form
2A1 None HSS 118° standard Chipbreaker
2A2 Oil Tube HSS 130° standard Chipbreaker
2A6* Oil Tube HSS-Co5 130° standard Chipbreaker
2A7 Oil Tube HSS-Co5 170° brad Chipbreaker

* Non Standard Product

pdfView the MTS Chipbreaker Drills Leaflet