Toroid Button, High-Feed, Square & Octagonal Inserts


Dapra's Toroid Line includes three high-performance inserts, including our RHINO-CARB™ line, to maximize the versatility of our Toroid cutting tools:

Button, high-feed, square and octagonal inserts

Match the insert R value to the designation on your cutter body.

‡ Fits 1-1/4" diameter and above only.

Cutting Edge Comparison

Cutting EdgeEdge StrengthTool PressureHeat Creation
T (T-Land)StrongestHighestHighest
N (Neutral)StrongMediumMedium
D (Dished)MediumLowestLowest
T-Land Cutting Edge "T" inserts have a strong, negative reinforced cutting edge for steels, irons and hard milling.
Neutral Cutting Edge "N" inserts (round and octagonal only) are more positive than the "T" edge, but stronger than "D." The "N" should be your go-to geometry for most steels, cast irons and 400-series stainless applications.
Dished Cutting Edge "D" inserts have a high-positive cutting edge for stainless steels, high-temperature alloys and gummy materials.

RHINO-CARB CNC-Pressed Inserts

CNC-Pressed Toroid Inserts

CNC-Pressed Toroid Inserts

Dapra's RHINO-CARB™ high-performance inserts are designed for very aggressive metal cutting and long tool life.

  1. Stronger cutting edge for heavier chiploads, greater shock absorption and longer tool life
  2. Positive top rake for reduced cutting forces and lower torque
  3. Thicker inserts for greater strength and enhanced heat-absorption capabilities

Important: These thicker pressed inserts may cause your cutter to cut a slightly larger diameter than with ground inserts. Always measure tool diameter before use.

Button Inserts

1 – Button Inserts – R3, R4, R5, R6

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

  • Mold cavity and core roughing
  • Roughing of complex part contours
  • Helical interpolation (larger diameter hole making)
  • Pocketing
  • Semifinishing
  • Face milling

Follow these links to view the Button Inserts that are available for each R/IC value:

Click here for technical help on optimum feeds for button inserts.

Read more about common applications for button cutters.


Square Inserts

2 – Square Inserts – R4

(1-1/4" dia. and above only)

Your Toroid cutter can now be used for the most common applications involving 90° milling. Utilize the more economical 4-sided inserts for:

  • Profiling
  • Step milling
  • Face milling
  • Slotting
  • Helical interpolation (cored holes only)
  • Plunge milling

Follow the link below to view available Square Inserts:

Octagonal Inserts

3 – Octagonal Inserts – R4*, R5, R6

8-sided geometry is excellent for general face milling. 45° lead angle provides increased feed capacity for:

  • Face milling
  • Profiling
  • Helical interpolation
  • Chamfering

Each of the 8 usable edges comes with an integral wiper flat for outstanding surface finishes (RHINO-CARB only).

Click here for information regarding 45° lead angle compensation for octagonal inserts.

* R4 Octagonal available in RHINO-CARB style only.


Toroid Insert Grade Selection
Shock & Wear Resistance Uncoated (Base Grade) with Coating Description Specifications
TOUGHEST
Shock Resistance
DMK30 Moderate wear resistance/high shock resistance. Recommended for interrupted or unstable steel, most stainless steel, hightemperature alloys and cast iron applications. ANSI C1-C2, ISO K25-K40, M25-M35
DMK30-HP High-performance medium-temperature grade. Optimum performance and wear resistance in most soft steels, soft stainless steels and cast irons.
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.
MEDIUM
Shock and Wear
DMK25 Micro-grain carbide providing higher wear resistance and good shock resistance for applications in tough stainless steels, high-temperature alloys, irons and many tool steels. ANSI C2-C3, ISO K15-K30, M15-M30
  DMK25-HP High-performance medium-temperature grade. Optimum performance and wear resistance in most soft steels, soft stainless steels and cast irons.
  DMK25-GLH Premium high-temperature coating. Outstanding performance and wear resistance in high-heat applications involving tough stainless steels, hightemperature alloys and many tool steels.
MEDIUM
Shock and Wear
DMP25 High wear resistance/moderate shock resistance. Recommended for most steel and many ductile iron applications. ANSI C5-C6, ISO P25-P40
DMP25-HP High-performance medium-temperature grade. Optimum performance and wear resistance in most soft steels and cast irons.
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.
HARDEST
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. Optimum cast iron substrate. ANSI C2-C3, ISO K15-K25, M15-M25
DMK15-HP High-performance medium-temperature grade. Optimum performance and wear resistance in most soft steels, soft stainless steels and cast irons.
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. Unbeatable performance and wear resistance in high-heat applications such as harder steels, tough stainless steels and high-temperature alloys.

The older "3" coating has been replaced by the new "TCI" grade. "3" is available upon request, but will typically have a 1-2 week delivery time.

The older "7" coating has been replaced by the new "GLH" grade. "7" is available upon request, but will typically have a 1-2 week delivery time.

DMK30-GLH is a good first choice for most applications. Additional coatings available on request. Contact Dapra for details.

DMK25 substrate is available for RHINO-CARB D and N geometries only.

Dapra Toroid products are made in the USA.