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Boring Bar Holders accept round bar type boring bars for internal boring, threading or facing. Regular high speed steel, carbide tipped, or replaceable tip boring bars work well with these holders. Split sleeve adapters are available to mount 1/2" round bars into the 3/4" boring bar holders.

The height "T" for the Boring Bar holders is measured from the top of the compound to the center of the boring bar. If the tool bit cutting edge is above or below the centerline of the boring bar be sure to allow for this difference when you determine the actual height of the cutting edge. You can make "custom" split bushings to hold boring bars smaller than the hole in the Boring Bar holders. If you make the hole in the bushing off-center (nonconcentric) you can further adjust the height of the boring bar