Page 390 - Carmex - Inch Catalog 2022

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Mill-Thread Technical Section

Cutting Data

CMT Spiral Multi Flute Inserts

Carbide grade - MT8:
Sub-Micron Grade with Aluminum Titanium Nitride (AlTiN) multi-layer coating (ISO K10-K20).
Extremely high heat resistant and smooth cutting operation, for high performance, and normal
machining conditions. General purpose for all materials.

Feed inch/tooth
ISO Cutting Speed Cutting Diameter = D
Material
Standard ft/min
Ø.63-Ø1.38
Low and Medium Carbon Steels <0.55%C 197 - 394 .0055 - .0094
P High Carbon Steels ≥0.55%C 197 - 295 .0047 - .0094
Alloy Steels,Treated Steels 164 - 262 .0031 - .0079
Stainless Steel-Free Cutting 230 - 328 .0031 - .0075
M Stainless Steel-Austenitic 197 - 295 .0031 - .0075
Cast Steels 230 - 295 .0031 - .0079
K Cast Iron 131 - 262 .0055 - .0094
Aluminum ≤12%Si, Copper 328 - 656 .0055 - .0102
N Aluminum >12%Si 197 - 459 .0031 - .0087

Synthetics, Duroplastics, Thermoplastics 164 - 656 .0067 - .0110
S Nickel Alloys, Titanium Alloys. 66 - 131 .0020 - .0055
Hardened Steel, 45-50HRc 197 - 230 .0028 - .0067
H
Hardened Steel, 51-55HRc 164 - 197 .0024 - .0063

B12-10