Linkedin Facebook Instagram Youtube

NTK Cutting Tools

S-MILL

For end milling｜ Swiss CNC lathes

NTK’s unique design for sharpness
Home / End Mill / S-MILL

Ideal for small diameter parts that are prone to vibrations

Targets small diameter parts with rigidity issues that benefits from a sharp cutting edge.
Features
  • Designed to focus on sharpness
  • Stable machining of even the smallest workpieces
  • AC3 grade with a thin TiACrN-TiAlN coating for wear resistance
Tooling application

Swiss CNC lathes End milling

Part surface finish comparison
[ Cutting conditions ]
Material : SUS304 ⌀16.0  ap=3.0mm  ae=1.2mm  S = 3,000rpm  F = 300mm/min 304SS ⌀.630” .118 DOC ae=.047 width S = 3,000rpm F = 11.8 IPM

[ Tools used ]
⌀6.0mm ⌀.236” – 2 flute
Lineup

RWEM type Solid endmill / S-mill series

Flute ⌀Dc (mm) (inch) Carbon steel Alloy steel Stainless steel ae = ⌀Dc × 0.2 ae = ⌀Dc × 0.5 ae = ⌀Dc × 0.75 ae = ⌀Dc × 0.9 ae = ⌀Dc
min-1 rpm mm/min IPM min-1 rpm mm/min IPM min-1 rpm mm/min IPM ap (mm) (inch) ae (mm) (inch) ap (mm) (inch) ae (mm) (inch) ap (mm) (inch) ae (mm) (inch) ap (mm) (inch) ae (mm) (inch) ap (mm) (inch)
2 flute 2.0 .079 6,000 14,300 100 9.1 6,000 11,100 100 7.1 6,000 10,300 90 5.5 ≦ 2.0 .079 0.4 .016 ≦ 0.8 .031 1.0 .039 ≦ 0.6 .024 1.5 .059 ≦ 0.5 .020 1.8 .071 ≦ 0.4 .016
3.0 .118 6,000 9,500 210 13.0 6,000 7,400 240 10.2 6,000 6,900 180 8.3 ≦ 3.0 .118 0.6 .024 ≦ 1.2 .047 1.5 .059 ≦ 0.9 .035 2.3 .091 ≦ 0.7 .028 2.7 .106 ≦ 0.6 .024
4.0 .157 6,000 7,200 320 15.4 5,600 5,600 300 11.8 5,200 5,200 240 9.4 ≦ 4.0 .157 0.8 .031 ≦ 1.6 .063 2.0 .079 ≦ 1.2 .047 3.0 .118 ≦ 1.0 .039 3.6 .142 ≦ 0.8 .031
5.0 .197 5,000 5,700 370 16.5 4,500 4,500 330 13.0 4,100 4,100 260 10.2 ≦ 5.0 .197 1.0 .039 ≦ 2.0 .079 2.5 .098 ≦ 1.5 .059 3.8 .150 ≦ 1.2 .047 4.5 .177 ≦ 1.0 .039
6.0 .236 4,200 4,800 380 17.3 3,700 3,700 340 13.4 3,400 3,400 270 10.6 ≦ 6.0 .236 1.2 .047 ≦ 2.4 .094 3.0 .118 ≦ 1.8 .071 4.5 .177 ≦ 1.5 .059 5.4 .213 ≦ 1.2 .047
7.0 .276 3,600 4,100 370 16.5 3,200 3,200 330 13.0 3,000 3,000 270 10.6 ≦ 6.0 .236 1.4 .055 ≦ 2.8 .110 3.5 .138 ≦ 2.1 .083 5.3 .209 ≦ 1.7 .067 6.3 .248 ≦ 1.4 .055
8.0 .315 3,200 3,600 360 16.1 2,800 2,800 320 12.6 2,600 2,600 250 9.8 ≦ 6.0 .236 1.6 .063 ≦ 3.2 .126 4.0 .157 ≦ 2.4 .094 6.0 .236 ≦ 2.0 .079 7.2 .283 ≦ 1.6 .063
10.0 .394 2,500 2,900 320 14.6 2,200 2,200 280 11.0 2,100 2,100 230 9.1 ≦ 6.0 .236 2.0 .079 ≦ 4.0 .157 5.0 .197 ≦ 3.0 .118 7.5 .295 ≦ 2.5 .098 9.0 .354 ≦ 2.0 .079
3 flute 3.0 .118 6,000 9,500 250 15.4 6,000 7,400 250 12.2 6,000 6,900 220 9.8 ≦ 3.0 .118 8.0 .315 ≦ 1.2 .047 1.5 .059 ≦ 0.9 .035 2.3 .091 ≦ 0.7 .028 2.7 .106 ≦ 0.6 .024
4.0 .157 6,000 7,200 390 18.5 5,600 5,600 360 14.2 5,200 5,200 290 11.4 ≦ 4.0 .157 0.8 .031 ≦ 1.6 .063 2.0 .079 ≦ 1.2 .047 3.0 .118 ≦ 1.0 .039 3.6 .142 ≦ 0.8 .031
5.0 .197 5,000 5,700 440 19.7 4,500 4,500 400 15.7 4,100 4,100 310 12.2 ≦ 5.0 .197 1.0 .039 ≦ 2.0 .079 2.5 .098 ≦ 1.5 .059 3.8 .150 ≦ 1.2 .047 4.5 .177 ≦ 1.0 .039
6.0 .236 4,200 4,800 460 20.9 3,700 3,700 410 16.1 3,400 3,400 330 13.0 ≦ 6.0 .236 1.2 .047 ≦ 2.4 .094 3.0 .118 ≦ 1.8 .071 4.5 .177 ≦ 1.5 .059 5.4 .213 ≦ 1.2 .047
7.0 .276 3,600 4,100 450 20.1 3,200 3,200 400 15.7 3,000 3,000 320 12.6 ≦ 6.0 .236 1.4 .055 ≦ 2.8 .110 3.5 .138 ≦ 2.1 .083 5.3 .209 ≦ 1.7 .067 6.3 .248 ≦ 1.4 .055
8.0 .315 3,200 3,600 430 19.3 2,800 2,800 380 15.0 2,600 2,600 310 12.2 ≦ 6.0 .236 1.6 .063 ≦ 3.2 .126 4.0 .157 ≦ 2.4 .094 6.0 .236 ≦ 2.0 .079 7.2 .283 ≦ 1.6 .063
10.0 .394 2,500 2,900 380 17.3 2,200 2,200 330 13.0 2,100 2,100 280 11.0 ≦ 6.0 .236 2.0 .079 ≦ 4.0 .157 5.0 .197 ≦ 3.0 .118 7.5 .295 ≦ 2.5 .098 9.0 .354 ≦ 2.0 .079
4 flute 3.0 .118 6,000 9,500 290 18.1 6,000 7,400 290 14.2 6,000 6,900 250 11.4 ≦ 3.0 .118 0.6 .024 ≦ 1.2 .047 1.5 .059 ≦ 0.9 .035 2.3 .091 ≦ 0.7 .028 2.7 .106 ≦ 0.6 .024
4.0 .157 6,000 7,200 450 21.3 5,500 5,600 410 16.5 5,200 5,200 340 13.4 ≦ 4.0 .157 0.8 .031 ≦ 1.6 .063 2.0 .079 ≦ 1.2 .047 3.0 .118 ≦ 1.0 .039 3.6 .142 ≦ 0.8 .031
5.0 .197 5,000 5,700 520 23.2 4,500 4,500 460 18.1 4,100 4,100 370 14.6 ≦ 5.0 .197 1.0 .039 ≦ 2.0 .079 2.5 .098 ≦ 1.5 .059 3.8 .150 ≦ 1.2 .047 4.5 .177 ≦ 1.0 .039
6.0 .236 4,200 4,800 540 24.4 3,700 3,700 480 18.9 3,400 3,400 380 15.0 ≦ 6.0 .236 1.2 .047 ≦ 2.4 .094 3.0 .118 ≦ 1.8 .071 4.5 .177 ≦ 1.5 .059 5.4 .213 ≦ 1.2 .047
7.0 .276 3,600 4,100 520 23.2 3,200 3,200 460 18.1 3,000 3,000 380 15.0 ≦ 6.0 .236 1.4 .055 ≦ 2.8 .110 3.5 .138 ≦ 2.1 .083 5.3 .209 ≦ 1.7 .067 6.3 .248 ≦ 1.4 .055
8.0 .315 3,200 3,600 500 22.4 2,800 2,800 440 17.3 2,600 2,600 360 14.2 ≦ 6.0 .236 1.6 .063 ≦ 3.2 .126 4.0 .157 ≦ 2.4 .094 6.0 .236 ≦ 2.0 .079 7.2 .283 ≦ 1.6 .063
10.0 .394 2,500 2,900 440 20.1 2,200 2,200 390 15.4 2,100 2,100 320 12.6 ≦ 6.0 .236 2.0 .079 ≦ 4.0 .157 5.0 .197 ≦ 3.0 .118 7.5 .295 ≦ 2.5 .098 9.0 .354 ≦ 2.0 .079

Cutting conditions (machine, work material…) affect surface finish and burr generation.
If cutting performance is not good with above cutting conditions, please adjust speed and feed by same ratio.

⌀6mm ⌀.236” – 2 flute D-Cut
Material :
SUS416F
Spindle speed :
3,200 rpm/min
Feed :
140 mm/min 5.5 IPM
DOC :
0.6 mm .024 inch
Coolant :
WET
S-MILL
12,000 pcs / corner+α
Competitor’s solid endmill
10,000 pcs / corner
The competitor’s end mill showed an obvious decrease in surface finish quality as it reached the end of its tool life.
The S-Mill maintained a quality finish throughout the extent of its long tool life.
⌀6mm – 2 flute ⌀10mm → AF 8mm ⌀.236” – 2 flute ⌀.394” → AF .315” hexagon
Material :
S45C
Spindle speed :
2,600 rpm/min
Feed :
480 mm/min 18.9 IPM
DOC :
1.0 mm .039 inch
Coolant :
WET
S-MILL
70 pcs / corner+α
Competitor’s solid endmill
50 pcs / corner
The S-Mill’s sharpness reduced the occurrence of burrs and increased tool life compared to competitor’s tool.
The sharp cutting edge also produced noticeably less sound than the current tool.
Related News
January 8, 2026

NTK Cutting Tools Expands JRF Modular Cutter Series

NTK Cutting Tools announces a major expansion of its JRF cutter series with the launch ...

For more information about this product, visit our online e-catalog, or download the catalog/product report

eCatalog (mm)
eCatalog (in)
Catalog
Contact Us Now
Back to the List
About
Solutions & Products
Miniature Machining
About
Solutions & Products
Linkedin Facebook Instagram Youtube