Available in diameters from .0375–1 in. with flute length up to 2.5 times diameter, 6-flute Models S638 and S638R take larger radial depths of cut as compared with 7- and 9-flute tools. AlTiN coating allows end mills to achieve long, predictable tool life in milling applications that involve high temperatures and abrasive workpiece materials, such as titanium and pH stainless steels. For smooth cutting and high surface finishes, variable indexing minimizes harmonics.