HRC65 Mold Steel End Mill【4 Flutes Long Neck Φ 1-3】

Get 4 Flutes Long Neck Φ 1-3 at the Best Price from SAMHO!

SAMHO, your trusted procurement partner, is offering the best deals on Flat End Mill【4 Flutes Long Neck Φ 1-3】from China. We understand the importance of reliable and efficient products for your business, which is why we source directly from trusted manufacturers.

Home » Square End Mill » HRC65 Flat Long Neck End Mill【4 Flutes Long Neck Φ 1-3】

Designed for Hardened Steels up to 65HRC – Ideal for Deep Feature Machining
Engineered for precision machining of hardened tool steels (up to 65HRC), the tool combines a high-strength carbide substrate with an extended neck design, making it ideal for deep cavity milling, narrow features, and areas requiring extra reach without sacrificing stability.

4-Flute Geometry for High Material Removal and Surface Finish Optimization
The 4-flute configuration increases cutting edge contact, allowing for faster feed rates and smoother finishes compared to 2-flute tools. It’s especially effective in semi-finishing and finishing of hardened molds, reducing passes and cycle time.

Long Neck Design Balances Reach and Rigidity – Perfect for Mold Cores and Deep Contours
With a shortened flute length and reinforced neck, this tool provides sufficient stiffness for deep-pocket machining, minimizing tool deflection and vibration. It’s particularly suited for precision mold cavities, ribs, slots, and intricate 3D surfaces.

High-Red-Hardness Coating for Heat Resistance in Dry or MQL Machining
Featuring a premium nano-layer coating (e.g., TiAlN or similar), the tool withstands extreme thermal loads during high-speed dry or minimal-lubrication machining. It ensures extended tool life and consistent cutting performance under demanding conditions.

Complete Cutting Data Provided for Consistent and Efficient Results
Each tool includes application-tested cutting parameters tailored for high-HRC materials—such as speed, feed, and depth of cut—helping CNC programmers and operators reduce setup time, avoid trial-and-error, and maximize productivity from day one.

Highly Recommend for Machining

Specialty

Total 24 Models-Unit(Mm)

SHGLS4 Milling Parameters

FAQ：4 Flute Long Neck Flat End Mill for Hardened Steel Machining

Q1: How can tool breakage or chipping be avoided when using a 4-flute long neck end mill?

A: In hardened steel machining, tool breakage is mainly caused by vibration, excessive cutting load, and heat concentration at the cutting edge. When using a 4-flute long neck flat end mill for hardened steel, process stability is critical.

To reduce the risk of chipping or breakage, we recommend the following machining practices:

Keep radial depth of cut (ae) between 10%–30% of tool diameter
Use a step-down cutting strategy to distribute cutting load
Maintain a stable and consistent feed rate to avoid shock loading
Avoid interrupted cuts, which increase edge stress
Use a high-rigidity tool holder such as a shrink-fit holder or high-precision collet chuck
Ensure efficient chip evacuation to prevent chip re-cutting and heat buildup

In real machining practice, stable engagement is more important than aggressive cutting parameters when using a long neck carbide end mill for hardened steel.

Q2: What are the advantages of a 4-flute design over a 2-flute end mill for hardened steel machining?

A: When machining hardened tool steel (HRC 50+), a 4-flute end mill provides improved rigidity and cutting stability compared to a 2-flute design.

Key advantages include:

Higher tool body rigidity, reducing deflection in deep cavity machining
More stable tool path control during finishing and contour milling
Improved surface finish quality with lower Ra values
Better performance in semi-finishing and finishing operations of mold steel

However, due to reduced chip space, a 4-flute carbide end mill is not ideal for heavy roughing or deep slotting. It performs best in precision machining, mold finishing, and surface refinement applications.

Q3: Is a 4-flute long neck flat end mill suitable for high-hardness steel (HRC 50+)?

A: Yes, but only under controlled machining conditions.

A 4-flute long neck flat end mill for hardened steel machining performs well in the following range:

Optimal material range: HRC 45–55 mold steel
For HRC 55–58: reduce feed rate and axial depth of cut
For HRC 60+: performance depends on machine rigidity and tool coating
For HRC 60–65 and above: a dedicated HRC65 end mill series is recommended

To ensure tool life and prevent edge chipping, a rigid setup and short tool overhang are essential, especially in deep cavity milling applications.

Q4: How does a 4-flute long neck flat end mill perform in mold steel finishing applications?

A: In real-world mold machining, a 4-flute long neck flat end mill performs consistently in semi-finishing and finishing of hardened mold steels such as H13, SKD61, and P20.

Its key performance advantages include:

Stable cutting with reduced vibration marks in deep cavity milling
Excellent surface finish quality for mold wall and bottom surfaces
Longer tool life when cutting parameters are properly optimized
Reliable dimensional accuracy in precision mold finishing

However, for steels above HRC 60, it is generally recommended to switch to specialized high hardness end mills (HRC65 or coated carbide series) designed for extreme wear resistance and thermal stability.

Q5: How should cutting parameters be selected to prevent chatter and tool failure?

A: Proper parameter selection is essential when using a long neck carbide end mill for hardened steel machining, especially in deep cavity applications where tool deflection is more likely.

Recommended guidelines include:

Keep tool overhang as short as possible (ideally within 3×D)
Use light side milling with radial engagement (ae) at 10%–30% of diameter
Balance spindle speed and feed rate to avoid excessive impact load
Prefer climb milling for better stability and surface quality
Use appropriate coolant strategy based on material (air blast, mist, or cutting fluid for steel)
Maintain rigid fixturing to minimize vibration in deep pocket machining

In production environments, controlling tool stability and engagement consistency is more important than increasing cutting speed.