R4 1/2" IC Toroid Cutting Tools & Inserts
R4: 1/2" Insert Cutting Tools
- 1.250" shank dia. cutters and smaller are available in limited supply without Weldon Flats. Add WOF to the end of the part number when ordering.
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Toroid End Mills (with thru-tool coolant unless noted) OD
Dia.Holder R
Effective LengthL
Overall LengthS
Shank Dia.Flutes Insert
Match color to inserts belowInsert Dia. 1.000" TREM100-125-R4-2‡ 1.250" 3.530" 1.000" 2 
.500" 1.000" TREM100-250-R4-2‡ 2.500" 4.750" 1.000" 2 .500" 1.000" TREM100-450-R4-2‡ 4.500" 6.750" 1.000" 2 .500" 1.250" TREM125-300-R4-3* 3.000" 5.280" 1.250" 3 
.500" 1.250" TREM125-500-R4-3* 5.000" 7.280" 1.250" 3 .500" 1.500" TREM150-350-R4-3* 3.500" 5.780" 1.250" 3 .500" 1.500" TREM150-550-R4-3* 5.500" 7.780" 1.250" 3 .500" -
Toroid Carbide Core End Mills (solid, no thru-tool coolant) OD
Dia.Holder R
Effective LengthL
Overall LengthS
Shank Dia.Flutes Insert
Match color to inserts belowInsert Dia. 1.000" CC-TREM100-450-R4-2‡ 4.500" 6.750" 1.000" 2 .500" 1.250" CC-TREM125-500-R4-3 5.000" 7.280" 1.250" 3 .500" 1.500" CC-TREM150-550-R4-3 5.500" 7.780" 1.250" 3 .500" - * Does not have thru-tool coolant. ‡ Uses RDCH-43 / RPMH-44 / OPMH442 Inserts only.
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Toroid Shell Mills OD
Dia.Holder R
Effective LengthB
Arbor Dia.H
Counter Bore Dia.Flutes Insert
Match color to inserts belowInsert Dia. 2.000" TRSM200-075-R4-4 1.500" .750" .590" 4 .500" 2.000" TRSM200-075-R4-5 1.500" .750" .590" 5 .500" 2.500" TRSM250-100-R4-6 2.000" 1.000" .790" 6 .500" 3.000" TRSM300-100-R4-6 2.000" 1.000" .790" 6 .500" 4.000" TRSM400-150-R4-7 2.000" 1.500" 2.050" 7 .500" 5.000" TRSM500-150-R4-9 2.000" 1.500" 2.060" 9 .500" 6.000" TRSM600-150-R4-9 2.000" 1.500" 2.060" 9 .500" 6.000" TRSM600-150-R4-12 2.000" 1.500" 2.060" 12 .500"
R4: 1/2" IC Inserts
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"T" inserts have a reinforced cutting edge for steels, irons and hard milling. 
"N" inserts are for typical cutting applications where high-performance milling of steels, irons and 400-series stainless is desired. 
"D" inserts have a high-positive cutting edge for stainless steels, high-temperature alloys and gummy materials. 
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R4 Button Inserts Insert IC Thickness Radius Uncoated Coated 
DMK30
DMK25†
DMP25
DMK15
DMK253†
DMP253
DMK153DMK30-HP
DMK25-HP†
DMP25-HP
DMK15-HPDMK307
DMK257†
DMP257
DMK157DMK30-GLH
DMK25-GLH†
DMP25-GLH
DMK15-GLHRPMH-44-T .500" .220" .250" • • • • • RPMH-44-N .500" .220" .250" • • • • • RPMH-44-D .500" .220" .250" • • • • • Ground DMK30
DMP25
DMK15
DMP253
DMK153DMK30-HP
DMP25-HP
DMK15-HPDMK307
DMP257
DMK157DMK30-GLH
DMP25-GLH
DMK15-GLHRDCH-43-T .500" .187" .250" • • • • • RDCH-43-D .500" .187" .250" • • • • • - † DMK25 substrate is available for RHINO-CARB D and N geometries only.
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R4 High-Feed Inserts Insert IC Thickness Max. DOC Program Radius** Coated 
DMK303
DMP253DMK30-HP
DMP30-HPDMK307
DMP257DMK30-GLH
DMP25-GLHHFDEH1305-T* .500" .220" .080" .135" • • • • Ground HFDCH-43-T4* .500" .187" .040" .220" • • • • HFDEH1305-D* .500" .220" .080" .135" • • • • - * High-feed inserts require a specific program radius in order to provide correct material removal and avoid undercutting. HFDCH-43 and HFDEH inserts are suitable for 1-1/4" diameters and above only.
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R4 Square Inserts Insert IC Thickness Corner Radius Coated 
DMK303
DMP253
DMK153DMK30-HP
DMP25-HP
DMK15-HPDMK307
DMP257
DMK157DMK30-GLH
DMP25-GLH
DMK15-GLHSXEH-432-T .500" .200" .031" • • • • SXEH-432-D .500" .200" .031" • • • • - SXEH inserts are suitable for 1-1/4" diameters and above only.
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R4 Octagonal Inserts Insert IC Thickness Radius Max. DOC Uncoated Coated 
DMK30
DMK25†
DMP25
DMK15DMK303
DMK253†
DMP253
DMK153DMK30-HP
DMK25-HP†
DMP25-HP
DMK15-HPDMK307
DMK257†
DMP257
DMK157DMK30-GLH
DMK25-GLH†
DMP25-GLH
DMK15-GLHOPMH442-T .500" .220" .031" .135" • o • • • • OPMH442-N .500" .220" .031" .135" • o • • • • OPMH442-D .500" .220" .031" .135" • • • • • • - † DMK25 substrate is available for RHINO-CARB D and N geometries only.
Dapra Toroid products are made in the USA.