Unlike true rounds, Helido 400 Round inserts have a periphery that consists of bounding arcs with radii that would be found on pure rounds twice their size. Each insert has four 120 degree arcs. This enables the cutters to have more flutes compared to existing standards resulting in higher feed capability. The inserts are double sided, with helical cutting edges for gentler entry plus top-face geometry to create 10 degree positive-rake inclination. They feature ISCAR's innovative SumoTec post-coating treatment that improves performance 35 percent on average. Each insert provides four 120 degree arcs.
Dovetail clamping design in the cutter helps to direct forces to the body thus relieving clamping screw of the impact loads. The unique Helido 400 Round insert shape creates four fixed indexing positions per side and firmer no-twist seating able to withstand high cutting forces. Fixed indexing positions also ensure that all four edges are used, and eliminate the uncertainties that lead to discarding of rounds which still have good edges.