4-Flute Carbide Roughing End Mill

BB Roughing End Mill Series - Professional Solutions for Different Materials & Working Conditions

Reading the size options — Ø (cutting diameter) × shank Ø × flute length × overall length, all in mm. Example: 6×6×20×75 = 6 mm cutting diameter, 6 mm shank, 20 mm flute, 75 mm overall.

Milling stainless steel — three grades to choose from

BK2055 — general-purpose carbide for stainless and steel up to HRC 45. Best value when one tool has to cover mixed work.
SUS Series — 4-flute corner-radius geometry developed for stainless, titanium and heat-resistant alloys.
JIN — TiZr coating with a 38°/40° unequal helix, for side milling and dynamic paths where chatter is the limiting factor.

Recommended workpiece materials — BK2055

Stainless steel, carbon steel and alloy steel up to HRC 45. A general-purpose carbide grade built for everyday milling, drilling and tapping where toughness and edge stability matter more than hot hardness.

This series is designed for high-efficiency roughing, combining various flute designs, substrates, and coatings to achieve high metal removal rates and tool life.

/ Series Overview

Series	Code	Key Features	/ Coating/Surface	Best Application
Economy Uncoated	BF2055	Uncoated, sharp cutting, optimized for non-ferrous metals	Uncoated	Aluminum, Copper, Plastics
DLC High-Performance DLC	BC2055	DLC Colored DLC coating, low friction, anti-adhesion	DLC Colored DLC	Aluminum, Sticky Materials
General Purpose	BB2055	TiSiN Balanced design, TiSiN coating, wide application range	TiSiN TiSiN Coating	Steel, Stainless Steel, Mold Steel
High-Efficiency Chip Evacuation	BK2055	U New U-type flute design, larger chip space	Multi-coating Options	Mild Steel, Low-Carbon Steel, Long-chip Materials
Nano Blue	BL2060	AlTiN Nano-structured AlTiN coating, high hardness & thermal stability	AlTiN Nano Blue AlTiN	Hard Steel, Hardened Steel, High-Temp Alloys

BF2055 / Non-Ferrous Metal Expert

Design Philosophy: Optimized rake angle and polished edges provide extreme sharpness, minimizing built-up edge in non-ferrous metals.
Advantages: Cost-effective, low cutting force, excellent surface finish.

BC2055 / Anti-Adhesion King

Design Philosophy: Unique colored DLC coating with ultra-low friction and high surface hardness prevents aluminum adhesion.
Advantages: Extremely long lifespan, suitable for dry cutting, excellent side-wall finish on aluminum.

BB2055 / General Purpose Workhorse

Design Philosophy: Classic TiSiN coating balances hardness and toughness; universal flute design handles most steel and stainless steel.
Advantages: Versatile, cost-effective, wide application range.

BK2055 / Chip Evacuation Master

Design Philosophy: Innovative U-type flute design provides larger chip space and smoother evacuation path than traditional serrated cutters.
Advantages: Enables higher feed rates and longer continuous machining in mild steel and long-chip materials.

BL2060 / Extreme Conditions Warrior

Design Philosophy: Nano-composite blue-grey AlTiN coating withstands extreme cutting temperatures, ideal for difficult-to-machine materials.
Advantages: Excellent red hardness, strong oxidation resistance.