WIDIA ™ VariTurn
Grade Numbering System
A system of grades, geometries, and application guidelines to provide optimal solutions for your
metalcutting needs. It’s easy to determine which WIDIA ™ chip-control cutting tool will work best in
your specifi c workpiece materials and applications!
TN 15 M
Brand Relative Hardness
(ISO 513) Primary
Workpiece
Material (ISO 513)
01
= Hardest
10
20
30
40
50
B110
P
Steel
M Stainless Steel
= Toughest
K Cast Iron
N Non-Ferrous
S High-Temp Alloys
H Hardened Materials
U Universal Machining
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TN = WIDIA