Page 387 - Carmex - Inch Catalog 2022

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Mill-Thread Technical Section

Spiral Mill-Thread Inserts Speed and Feed

Selection

MT7 Sub-Micron Grade with Titanium Aluminum Nitride multi-layer coating (ISO K10 - K20).
This is a general purpose grade, which can be used with all materials; it should be run at
medium to high cutting speeds.

Cutting Speed ft/min
ISO Materials
MT7
Low and Medium Carbon Steels 480 - 1200
P High Carbon Steels 540 - 840
Alloy Steels, Treated Steels 440 - 755

Stainless Steels 540 - 800
M
Cast Steels 620 - 800
K Cast Iron 330 - 720
Non-Ferrous & Aluminum 755 - 1440
N
Synthetics, Duroplastics, Thermoplastics 480 - 1940
S Nickel Alloys, Titanium Alloys 100 - 380
Recommended FEED RATE: .002 - .006
As you may note, cutting speed is shown in range terms. In most standard cases choosing a speed
in the middle of the range would be a good choice for a start.
For hard metals reduce cutting speed.

Spiral Finish Speed Selection

MT7 Sub-Micron Grade with Titanium Aluminum Nitride multi-layer coating (ISO K10 - K20).
This is a general purpose grade, which can be used with all materials; it should be run at
medium to high cutting speeds.

Cutting Speed
ISO Materials
ft/min
Low and Medium Carbon Steels 660 - 1080
P High Carbon Steels 560 - 770
Alloy Steels, Treated Steels 330 - 640
Stainless Steels 590 - 755
M
Cast Steels 590 - 755
K Cast Iron 660 - 1150

Non-Ferrous and Aluminum 1640 - 3610
N
Synthetics, Duroplastics, Thermoplastics 1310 - 4920
S Nickel Alloys, Titanium Alloys 100 - 180

B12-7