DTB Roughing Series Button Inserts

Round inserts have a strong cutting edge, making them an excellent choice for many applications, including:

"T" inserts have a reinforced cutting edge for steels, irons and hard milling. "D" inserts have a positive cutting geometry, designed to reduce cutting forces and heat. This edge is suitable for all materials.
Button Inserts
Insert Part Number IC Thickness # of Usable Edges Radius Edge Type
DTB-12-T 12mm .250" 12 6mm Strongest
DTB-12-D 12mm .250" 12 6mm High-Shear
MAX DOC 0.100" for 6 indexes per side
Grade Availability
  Uncoated with Coating
TOUGHEST Shock Resistance DMK30
T, D
T, D
T, D
MEDIUM Shock and Wear DMP25
HARDEST Wear Resistance


Your DTB series tool has hemispherical dimples designed to provide anti-rotation support as well as help maintain a minimum of 6 indexes per insert side (12 indexes total per insert). It is important that the insert be loaded correctly – with the raised dimples on the insert seating down into the recessed dimples in the cutter body pocket. See the diagram below.

DTB insert loading

DTB Insert Grade Selection
Shock & Wear Resistance Uncoated (Base Grade) with Coating Description Specifications
Shock Resistance
DMK30 Moderate wear resistance/high shock resistance. Recommended for interrupted or unstable steel, most stainless steel, high-temperature alloys and cast iron applications. ANSI C1-C2 ISO K25-K40, M25-M35
  DMK30-TCI High-performance medium- to high-temperature grade. Outstanding shock and wear resistance in steels, irons and stainless steels. Best suited for materials < 44 Rc.
DMK30-GLH Premium high-temperature coating. Best resistance to heat for high-shock applications. Excellent for tough stainless steels, high-temperature alloys and many tool steels.
Shock and Wear
DMP25 High wear resistance/moderate shock resistance. Recommended for most steel and ductile iron applications. ANSI C5-C6 ISO P25-P40
  DMP25-TCI High-performance medium- to high-temperature grade. Outstanding wear resistance in steels and ductile. Best suited for materials < 44 Rc.
DMP25-GLH Premium high-temperature grade. Unbeatable performance and wear resistance in high-heat applications such as higher-speed machining in steels (< 44 Rc) and ductile irons.
Wear Resistance
DMK15 Highest wear resistance with reduced shock absorption capabilities. Micro-grain carbide provides excellent edge strength. Suitable for all materials under stable conditions. ANSI C2-C3 ISO K15-K25, M15-M25
  DMK15-TCI High-performance medium- to high-temperature grade. Great for higher-speed gray iron applications and lighter cuts in steels <52 Rc or ductile iron.
DMK15-GLH Premium high-temperature grade for optimum wear resistance in cast irons and steel hard milling > 44 Rc.

Other coatings available upon request

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