Page 299 - Carmex - Inch Catalog 2018-19 Rev. B

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Mill - Thread Technical Section
M ill - T hr ead T echnical S ec tion

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 380 - 920
P High Carbon Steels 430 - 660

Alloy Steels, Treated Steels 340 - 590
Stainless Steels 430 - 620
M
Cast Steels 490 - 620
K Cast Iron 260 - 560
Non-Ferrous & Aluminum 590 - 1120
N
Synthetics, Duroplastics, Thermoplastics 380 - 1500

S Nickel Alloys, Titanium Alloys 80 - 300
Recommended Feed Rate: .002 - .006

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.
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