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Durable Mills HRC68 solid carbide 2 flute ball nose end mill cutter
Precision ground 2 flute ball nose end mill cutting edge for hardened steel
HRC68 2 Flute Ball Nose End Mill for Hardened Steel - Image 3

HRC68 2 Flute Ball Nose End Mill for Hardened Steel

Engineered for precision 3D profiling, this 2 flute ball nose end mill delivers superior contour accuracy on hardened steel up to HRC68. The micro-grain carbide substrate gives this 2 flute ball nose end mill outstanding wear resistance, making the carbide ball nose end mill an essential tool for high-speed mold finishing.

Ball Nose
Hardened Steel
30°
2 Flutes
AITiN+TiSiN
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HRC68 Solid Carbide 2 Flute Ball Nose End Mill for Hardened Steel Machining

Manufactured by Durable Mills, this industrial-grade 2 flute ball nose end mill is engineered specifically for finishing and semi-finishing operations on hardened steel, chilled cast iron, and high-tensile alloy steels up to HRC68. Compared to standard multi-flute tools, the optimized 2-flute ball nose geometry provides superior contouring accuracy, larger chip evacuation space, and reduced vibration during high-speed 3D copy milling and complex cavity profiling.

Key Product Advantages

  • Superior Contour Accuracy: The 2-flute symmetrical spherical design achieves significantly higher profile precision than 4-flute alternatives, delivering mirror-like surface finishes on complex mold contours.
  • High Hardness & Wear Resistance: Formulated with a sub-micron tungsten carbide substrate (Cobalt 9-10%, grain size 0.3-0.4 μm, hardness HRA93.2-94) combined with an ultra-hard physical vapor deposition coating.
  • Optimized Cutting Rigidity: Reinforced core diameter prevents tool deflection, ensuring consistent dimensional repeatability in deep cavity machining.
  • Economical Universal Performance: Delivers long tool life and cost-efficient batch production for global mold, die, and aerospace machining facilities.

Material Composition & Technical Specifications

Parameter Specification Value
Cobalt Content (Co) 9% – 10%
Grain Size 0.3 μm – 0.4 μm (Ultra Micro-grain)
Hardness (HRA) HRA 93.2 – 94.0
Working Hardness Range Up to HRC 68
Helix Angle / Flutes 30° / 2 Flutes

Recommended Cutting Parameters

Workpiece Material Axial Depth (ap) Radial Width (ae) Linear Speed Vc (m/min) Feed Rate fz (mm/z)
Alloy Steel, Hardened Steel (45-65 HRC) ap ≤ 0.05-0.1D ae ≤ 0.02D 70 – 100 0.015D
Hardened Steel & Chilled Cast Iron (>65 HRC) ap ≤ 0.03-0.08D ae ≤ 0.015D 60 – 90 0.010D
Carbon Steel & Alloy Steel (<35 HRC) ap ≤ 0.15D ae ≤ 0.05D 120 – 180 0.025D
Stainless Steel & Cast Iron (<32 HRC) ap ≤ 0.1D ae ≤ 0.03D 80 – 120 0.018D

Product Size Chart & Full Specifications

HRC68 2 flute ball nose end mill engineering technical drawing and dimensions

Model Code Radius R (mm) Flute Length Lc (mm) Shank Dia. d (mm) Total Length L (mm) Flutes
DM-R1.5*6*3*50*2T 1.5 6 3 50 2
DM-R1.5*6*3*75*2T 1.5 6 3 75 2
DM-R1.5*6*3*100*2T 1.5 6 3 100 2
DM-R0.5*2*4*50*2T 0.5 2 4 50 2
DM-R0.75*3*4*50*2T 0.75 3 4 50 2
DM-R1*4*4*50*2T 1.0 4 4 50 2
DM-R1.25*5*4*50*2T 1.25 5 4 50 2
DM-R1.5*6*4*50*2T 1.5 6 4 50 2
DM-R1.75*7*4*50*2T 1.75 7 4 50 2
DM-R2*8*4*50*2T 2.0 8 4 50 2
DM-R2*8*4*75*2T 2.0 8 4 75 2
DM-R2*8*4*100*2T 2.0 8 4 100 2
DM-R2.5*10*5*50*2T 2.5 10 5 50 2
DM-R2.5*10*5*75*2T 2.5 10 5 75 2
DM-R2.5*10*5*100*2T 2.5 10 5 100 2
DM-R2.5*10*6*50*2T 2.5 10 6 50 2
DM-R3*12*6*50*2T 3.0 12 6 50 2
DM-R3*12*6*75*2T 3.0 12 6 75 2
DM-R3*12*6*100*2T 3.0 12 6 100 2
DM-R3*12*6*150*2T 3.0 12 6 150 2
DM-R3.5*14*8*60*2T 3.5 14 8 60 2
DM-R4*16*8*60*2T 4.0 16 8 60 2
DM-R4*16*8*75*2T 4.0 16 8 75 2
DM-R4*16*8*100*2T 4.0 16 8 100 2
DM-R4*16*8*150*2T 4.0 16 8 150 2
DM-R4.5*18*10*75*2T 4.5 18 10 75 2
DM-R5*20*10*75*2T 5.0 20 10 75 2
DM-R5*20*10*100*2T 5.0 20 10 100 2
DM-R5*20*10*150*2T 5.0 20 10 150 2
DM-R5.5*22*12*75*2T 5.5 22 12 75 2
DM-R6*24*12*75*2T 6.0 24 12 75 2
DM-R6*24*12*100*2T 6.0 24 12 100 2
DM-R6*24*12*150*2T 6.0 24 150 2
DM-R6.5*26*14*100*2T 6.5 26 14 100 2
DM-R7*28*14*80*2T 7.0 28 14 80 2
DM-R7*28*14*100*2T 7.0 28 14 100 2

Frequently Asked Questions (FAQ)

1. Why choose a 2 flute ball nose end mill over a 4 flute tool for hardened steel?

A 2 flute ball nose end mill offers significantly more chip pocket volume and eliminates tool center clearance interference during 3D copying. This ensures superior contour precision, smoother chip evacuation, and lower heat accumulation when finishing high-hardness steels.

2. What is the maximum hardness this cutter can process?

This ball nose series is specifically engineered for workpieces up to HRC 68, including pre-hardened mold steel, tool steels, quenched steels, and chilled cast iron.

3. Can Durable Mills provide custom lengths or private labeling for distributors?

Yes. As a direct industrial manufacturer, Durable Mills supports OEM branding, custom shank/neck designs, custom overall lengths, and bulk wholesale pricing for international distributors.

4. What cooling method is recommended for HRC60+ milling?

For machining hardened steels above HRC 60, dry cutting with compressed air blow or oil mist (MQL) is highly recommended to avoid thermal shock and edge micro-chipping caused by flood coolant.

Request a Wholesale Quote or Technical Assistance

Contact our CNC tooling engineers today to discuss standard stock orders, OEM requirements, or tailored milling parameters.

Contact Durable Mills Sales →
Direct Email: info@durablemills.com

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