04-18-2016, 02:32 PM
The "S" suffix on the grade is to indicate a post-coating treatment that smooths the suface of the coating for less chip adhesion (helps prevent Built Up Edge failure mode) and longer life. It's not worth paying twice as much for the newer version but does work. As the older grade WSM35 is depleted, only the WSM35S will be available and it's the SAME PRICE as the older grade. I would think you can get the older version for less because it's being closed out.
BTW, the S suffix on the grades seems to do a lot more for WKP35 than it does for WSM35 in terms of increased tool life. WSM35 & WSM35S can also be used on superalloys such as titanium, Monel and Inconel while the steel/cast iron grades (WKP) wouldn't last very long at all.
BTW, the S suffix on the grades seems to do a lot more for WKP35 than it does for WSM35 in terms of increased tool life. WSM35 & WSM35S can also be used on superalloys such as titanium, Monel and Inconel while the steel/cast iron grades (WKP) wouldn't last very long at all.