S-MILL

For end milling｜ Swiss CNC lathes

NTK’s unique design for sharpness

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Ideal for machining small-diameter compenents that are prone to vibration.

Optimized for low-rigidity workpieces, where a sharp cutting edge is essential to achieve stable machining.

Features

Designed with a strong emphasis on sharp cutting performance
Enables stable machining even on extremely small workpieces
AC3 grade substrate with a thin TiACrN–TiAlN coating for excellent wear resistance

Tooling application

Swiss CNC lathes
End milling

Comparison of machined surface finish

[ Cutting conditions ]
Workpiece 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

Cutting conditions

- - - Scroll the table - - -

Flute	⌀D_c (mm) (inch)	Carbon steel		Alloy steel		Stainless steel		a_e= ⌀D_c× 0.2		a_e= ⌀D_c× 0.5		a_e= ⌀D_c× 0.75		a_e= ⌀D_c× 0.9		a_e= ⌀D_c
Flute	⌀D_c (mm) (inch)	min-1 rpm	mm/min IPM	min-1 rpm	mm/min IPM	min-1 rpm	mm/min IPM	a_p (mm) (inch)	a_e (mm) (inch)	a_p (mm) (inch)	a_e (mm) (inch)	a_p (mm) (inch)	a_e (mm) (inch)	a_p (mm) (inch)	a_e (mm) (inch)	a_p (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.

Practical examples

⌀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

As the competitor’s end mill approached the end of its tool life, a significant deterioration in surface finish quality was observed.
By comparison, the S‑MILL delivered a consistently high-quality finish over its entire, extended 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

Thanks to its exceptional sharpness, the S‑MILL significantly reduced burr formation while achieving a longer tool life than competing tools.
The sharp cutting edge also resulted in noticeably quieter machining compared to conventional tools.

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