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Our new 6-inch and 8-inch jointers are both fantastic machines, and one feature that makes them perform so well is the inclusion of the new spiral cutterhead. This cutterhead design consists of a heavy-duty aluminum extrusion over an inner shaft made from steel. The cutterhead is fitted with a number of 4-sided carbide inserts that provide unparalleled cutting sharpness for these wood cutting tools. The 6-inch jointer features 12 carbide steel cutter inserts while the 8-inch jointer has 16 4-sided inserts. Being 4-sided, these inserts provide four separate, sharply honed edges. If one edge becomes dulled or chipped, it's an easy process to loosen the mounting screw to rotate or replace the tip.
The spiral cutterhead also makes the jointers quieter to operate than jointers with straight knife cutterheads, plus you get a smoother finish on your stock. Replacement inserts are sold in packs of 10.