Toroid Button, High-Feed, Square & Octagonal Inserts
Dapra's Toroid Line includes four high-performance inserts, including our new RHINO-CARB™ line, to maximize the versatility of our Toroid cutting tools:
Match the insert R value to the designation on your cutter body.
‡ Fits 1-1/4" diameter and above only.
Cutting Edge Comparison
| Cutting Edge | Edge Strength | Tool Pressure | Heat Creation |
|---|---|---|---|
| T (T-Land) | Strongest | Highest | Highest |
| N (Neutral) | Strong | Medium | Medium |
| D (Dished) | Medium | Lowest | Lowest |
 | Use Dapra's "T" geometry where the heaviest cuts are taken, or where vibration or chatter may be causing edge damage. This geometry is suitable for steels, irons and 400-series stainless. |
 | Use Dapra's "N" geometry in typical cutting applications where high-performance milling of steels, irons and 400-series stainless is desired. Available for round and octagonal RHINO-CARB inserts only. |
 | Use Dapra's D geometry in applications where the lowest tool pressure and higher shear are required. This geometry is best for most stainless steels and high-temperature alloys, but it is also a very free-cutting performer in softer steels. |
CNC-Pressed Toroid Inserts
Dapra's RHINO-CARB™ high-performance inserts are designed for very aggressive metal cutting and long tool life.
- Stronger cutting edge for heavier chiploads, greater shock absorption and longer tool life
- Positive top rake for reduced cutting forces and lower torque
- Thicker inserts for greater strength and enhanced heat-absorption capabilities
Important: These new, thicker inserts may cause your cutter to cut a slightly larger diameter than with our ground inserts. Always measure tool diameter before use.
New inserts fit current Toroid end mills and shell mills but require a thicker top clamp.*
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:
- R3: 3/8" IC Cutting Tools & Inserts
- R4: 1/2" IC Cutting Tools & Inserts
- R5: 5/8" IC Cutting Tools & Inserts
- R6: 3/4" IC Cutting Tools & Inserts
Click here for technical help on optimum feeds for button inserts.
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2 – High-Feed Inserts – R4
(R4 is 1-1/4" dia. and above only)
Ultra-aggressive geometry takes advantage of chip thinning to allow feed rates up to 6x faster than normal! Use high-feed inserts for:
- Mold cavity and core roughing
- Roughing of complex part contours
- Pocketing
- Helical interpolation
- Face milling (roughing only)
Follow these links to view the High-Feed Inserts that are available for each R/IC value:
Click here for technical help on feed compensation for high-feed inserts.
** High-feed inserts require a specific program radius in order to provide correct material removal and avoid undercutting.
3 – 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 these links to view the Square Inserts that are available for each R/IC value:
4 – 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.
Click here for information regarding 45° lead angle compensation for octagonal inserts.
* R4 Octagonal available in RHINO-CARB style only.
| Shock & Wear Resistance | Uncoated (Base Grade) | with Coating | Description | Specifications |
|---|---|---|---|---|
| TOUGHEST Shock Resistance |
DMK30 / DMK25 | Moderate wear resistance/high shock resistance. Recommended for interrupted or unstable steel, most 300 series stainless steel, high-temperature alloys and cast iron applications. DMK30 is higher in shock resistance, while the new DMK25 provides better edge life and slightly less toughness. DMK25 is better suited to the category of tough stainless steels and high-temperature alloys. | ANSI C1-C2, ISO K25-K40, M25-M35 | |
| DMK303 / DMK253 | PVD TiCN coating. Excellent wear resistance for low-to-medium operating temperatures. | |||
| DMK30-HP / DMK25-HP | High-performance medium-temperature grade. Optimum performance and wear resistance in most soft steels, soft stainless steels and cast irons. | |||
| DMK307 / DMK257 | PVD AlTiN coating. For higher-temperature applications including tougher stainless steels, high-temperature alloys and soft tool steels. | |||
| DMK30-GLH / DMK25-GLH | Premium high-temperature grade. Unbeatable performance in high-heat applications such as tough stainless steels, high-temperature alloys and soft tool steels. | |||
| MEDIUM Shock and Wear |
DMP25 | High wear resistance/moderate shock resistance, recommended for most steel and 400 series stainless steel applications. | ANSI C5-C6, ISO P25-P40 | |
| DMP253 | PVD TiCN coating. Excellent wear resistance for low-to-medium operating temperatures. | |||
| DMP25-HP | High-performance medium-temperature grade. Optimum performance and wear resistance in most soft steels, soft stainless steels and cast irons. | |||
| DMP257 | PVD AlTiN coating. For higher-temperature applications including high-speed machining in softer steels and ductile iron. | |||
| DMP25-GLH | Premium high-temperature grade. Unbeatable performance and wear resistance in high-heat applications in softer steels and ductile iron. | |||
| HARDEST Wear Resistance |
DMK15 | Highest wear resistance with reduced shock absorption capabilities. Micro-grain carbide provides excellent edge strength for abrasive applications in nonferrous materials. Suitable for castings, aluminum and smoother cuts in tough stainless steels, high-temperature alloys and hardened steel. | ANSI C2-C3, ISO K15-K25, M15-M25 | |
| DMK153 | PVD TiCN coating. Excellent wear resistance for low-to-medium operating temperatures. Good resistance to built-up edge for aluminum machining. | |||
| DMK15-HP | High-performance medium-temperature grade for lighter cuts. Optimum performance and wear resistance in most soft steels, soft stainless steels and cast irons. | |||
| DMK157 | PVD AlTiN coating. Appropriate for lighter cuts in higher-temperature applications such as high-velocity cast iron machining, tough stainless steels, high-temperature alloys and hardened steel. | |||
| DMK15-GLH | Premium high-temperature grade for lighter cuts. Unbeatable performance and wear resistance in high-heat applications such as harder steels, tough stainless steels and high-temperature alloys. |
DMP25-HP is a good first choice for most applications. Additional coatings available on request. Contact Dapra for details.
Dapra Toroid products are made in the USA.