Boring Bars

A boring bar reaches into a pre-drilled or cored hole to open it out to a finished diameter, on a lathe or a mill fitted with a boring head. The bar has to be stiff enough not to deflect under cut and short enough to clear the hole — chatter and taper are almost always a rigidity problem, not a tooling problem.

We stock Vortex and Omega indexable boring bars from mini bars (around 4-6mm shank) up to 25mm and above, in steel and carbide shank, screw-clamp holders for CCMT/CCGT, DCMT/DCGT and VCMT/VCGT inserts at 93° and 95° entering angles. Through-coolant and non-coolant versions are both stocked, along with reduced-vibration HSS-shank bars for extended-reach work where a solid carbide bar would be overkill.

Need to bore down to 1-3mm diameter? See our Carmex Tiny Tools boring bars — solid carbide bars for micro-bore work below what a standard indexable bar can reach. Fitting a small-shank bar into a larger toolholder? See boring bar sleeves.

All held in UK stock. Order before 4pm and it ships same day.