4 Flute Solid Carbide Square End Mill
The 4-flute square end mill is the most versatile workhorse in any CNC machine shop. With four evenly spaced cutting edges, it delivers higher feed rates and superior surface finish compared to 2-flute or 3-flute designs — making it the standard choice for profiling, facing, slotting, shoulder milling, and light roughing across a wide range of ferrous materials.
Key Features
- 4-Flute Geometry: Four cutting edges per revolution enable faster feed rates and a finer surface finish. Ideal for semi-finishing and finishing operations where productivity and part quality both matter.
- Square End Design: Flat-bottomed cutting profile produces clean 90° corners in pocket floors, shoulders, and stepped surfaces — essential for mould, die, and precision component manufacturing.
- 30°–35° Standard Helix Angle: Optimized helix angle balances cutting force distribution and chip evacuation for stable performance in steels, stainless steel, cast iron, and hardened materials up to 45 HRC.
- Premium Carbide Substrate: Micro-grain tungsten carbide provides high transverse rupture strength and wear resistance, resisting edge chipping even under interrupted cuts.
- Advanced Coating Options:
- TiAlN (Titanium Aluminum Nitride): Gold-copper finish. Operating temperature up to 800°C. Best all-round choice for carbon steel, alloy steel, stainless steel, and pre-hardened tool steel.
- TiSiN (Titanium Silicon Nitride): Higher hardness than TiAlN. Excellent for abrasive cast iron and materials with hard inclusions.
- nACro / AlCrN: For high-temperature applications, titanium alloys, Inconel, and difficult-to-machine superalloys.
- Precision Ground to h5 Tolerance: Diameter accuracy within ±0.005 mm ensures consistent dimensional control without additional offset adjustments.
Recommended Applications
General-purpose milling of carbon steels (1045, 4140), alloy steels (P20, H13, D2), stainless steels (304, 316, 17-4PH), cast iron (GG25, GCI), and pre-hardened tool steels up to 45–50 HRC. Suitable for CNC vertical machining centres, horizontal mills, and gang-type production machines.
Why Choose This Tool?
Unlike coated HSS or brazed-carbide cutters, our solid carbide construction allows significantly higher spindle speeds and feeds — typically 3–5× the material removal rate. The 4-flute layout means each tooth takes a lighter cut per revolution, reducing tool deflection and improving tool life in long-production runs.
Available Specifications
| Parameter | Range |
|---|---|
| Cutting diameter | 1.0 mm – 20.0 mm |
| Number of flutes | 4 |
| Helix angle | 30° / 35° |
| Shank type | Plain cylindrical (h6) / Weldon flat |
| Coating | TiAlN / TiSiN / nACro / Uncoated |
| Overall length | Standard & Long-reach variants |
Cutting Data Reference (P20 Tool Steel, TiAlN)
| Diameter | Speed (m/min) | Feed/tooth | RPM (approx.) |
|---|---|---|---|
| 6 mm | 120 | 0.04 mm | 6,400 |
| 10 mm | 120 | 0.06 mm | 3,800 |
| 12 mm | 110 | 0.07 mm | 2,900 |
| 16 mm | 100 | 0.08 mm | 2,000 |
Reduce speed by 20% for stainless steel. Reduce feed by 15% for full-width slotting.
Quality Assurance
Every tool is manufactured on ANCA or WALTER 5-axis CNC grinding machines and inspected on ZOLLER measuring systems. Diameter tolerance, runout, concentricity, and coating thickness are verified before shipment.
Custom specifications — including corner radius (ball nose), chamfer, taper, non-standard lengths, and special coatings — are available upon request. Lead time for standard tools: 15 working days. Free samples provided for qualified customers.