MRS Series (Z6) – Serrated (chip-breaker) roughing end mills

Q: Which materials is MRS Series (Z6) suitable for?

MRS Series (Z6) is used in ISO material groups P/M/K/H: Steel, Stainless, Cast iron, Hardened. Workpiece hardness: <56 HRC.

Q: Which diameters and flute counts does MRS Series (Z6) come in?

MRS Series (Z6) is available in Ø6 - Ø20 with Z6 flutes. Other sizes can be made to drawing.

Q: Which coating does MRS Series (Z6) have?

MRS Series (Z6) coating: AlCrN (wear resistance).

Q: What are the recommended cutting speed and feed for MRS Series (Z6)?

Geppetto Product Catalogue 2026 (p. 137–138): ISO P: Vc 65–230 m/min, fz 0.006–0.36 mm/tooth; ISO M: Vc 60–170 m/min, fz 0.006–0.36 mm/tooth; ISO K: Vc 70–230 m/min, fz 0.006–0.36 mm/tooth; ISO H: Vc 30–60 m/min, fz 0.006–0.36 mm/tooth. These are starting values; use the calculator to get spindle speed and feed for your diameter.

Q: Can MRS Series (Z6) be reground?

Yes. Geppetto offers CNC regrinding, Drag Finish edge preparation and PVD recoating for carbide end mills, drills and reamers.

MRS Series (Z6) – Serrated (chip-breaker) roughing end mills (Solid Carbide End Mill)

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Materials / applications

Unalloyed steels
Free-machining steels
Low-alloy steels
Stainless steels
Cast iron
Hardened materials

Technical specifications
Product group	Solid Carbide End Mill
Diameter range	Ø6 - Ø20
Number of flutes (Z)	6
Coating	AlCrN
Helix angle	~45°
Workpiece hardness	<56 HRC

See the product catalogue for dimension tables and order codes. Contact our technical team for special dimensions and tolerances.

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Dimensions and order codes ↓

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MRS Series (Z6) · 8

Dimensions and order codes

Values are taken from the table in the Geppetto product catalogue; dimensions in mm. For a quotation, send the order code and quantity.

Scroll the table sideways ↔

Catalogue page 42
Order code	D_c h10	l₁	l₂	D₂ h6	Z
MRS-0806-AC	8	63	19	8	6
MRS-1006-AC	10	72	22	10	6
MRS-1206-AC	12	83	26	12	6
MRS-1406-AC	14	83	26	14	6
MRS-1606-AC	16	92	32	16	6
MRS-1806-AC	18	92	32	18	6
MRS-2006-AC	20	104	38	20	6
MRS-2506-AC	25	120	45	25	6

Symbols, tolerances and order codes: Technical Guide →

MRS Series (Z6)

Cutting data, materials and coating

Suitable workpiece materials

ISO P · Steel
ISO M · Stainless
ISO K · Cast iron
ISO H · Hardened

Workpiece hardness: <56 HRC

Coating

AlCrN (wear resistance)

Recommended cutting data ranges

Source: Geppetto Product Catalogue 2026, p. 137–138 · Catalogue table: Ø1–25 mm.
ISO group	Vc (m/min)	fz (mm/tooth)
Steel	65–230	0.006–0.36
Stainless	60–170	0.006–0.36
Cast iron	70–230	0.006–0.36
Hardened	30–60	0.006–0.36

Values are starting recommendations; adjust them to machine rigidity, clamping, tool length and coolant.

Calculate n and Vf for your diameter →

Frequently asked questions

Which materials is MRS Series (Z6) suitable for?

MRS Series (Z6) is used in ISO material groups P/M/K/H: Steel, Stainless, Cast iron, Hardened. Workpiece hardness: <56 HRC.

Which diameters and flute counts does MRS Series (Z6) come in?

MRS Series (Z6) is available in Ø6 - Ø20 with Z6 flutes. Other sizes can be made to drawing.

Which coating does MRS Series (Z6) have?

MRS Series (Z6) coating: AlCrN (wear resistance).

What are the recommended cutting speed and feed for MRS Series (Z6)?

Geppetto Product Catalogue 2026 (p. 137–138): ISO P: Vc 65–230 m/min, fz 0.006–0.36 mm/tooth; ISO M: Vc 60–170 m/min, fz 0.006–0.36 mm/tooth; ISO K: Vc 70–230 m/min, fz 0.006–0.36 mm/tooth; ISO H: Vc 30–60 m/min, fz 0.006–0.36 mm/tooth. These are starting values; use the calculator to get spindle speed and feed for your diameter.

Can MRS Series (Z6) be reground?

Yes. Geppetto offers CNC regrinding, Drag Finish edge preparation and PVD recoating for carbide end mills, drills and reamers.