qt-tools-carbide-cutting-tools-logo
ProductsSolid Carbide 4 Flute Square End Mill for Stainless Steel | CNC Milling Cutters (1mm-12mm)
4-flute-carbide-square-end-mill-packaging
4-flute-carbide-square-end-mill-packaging
carbide-end-mill-coating-flute-details
carbide-end-mill-dimensions-chart-qt-tools
End Mills for Stainless SteelReady to ShipIn-StockRecommended

Solid Carbide 4 Flute Square End Mill for Stainless Steel | CNC Milling Cutters (1mm-12mm)

Boost stainless steel machining efficiency with our Premium Tungsten Carbide 4 Flute Square End Mills. High wear resistance, AlTiN coating, and factory-direct pricing. Sizes from 1mm to 12mm in stock. Get Free Samples today!

Contact Us

Product Function

Designed specifically for the rigorous demands of machining Stainless Steel (SUS304, SUS316), Alloy Steel, and Pre-hardened Steel. This 4 Flute Square End Mill is engineered to deliver superior surface finishes and extended tool life. It functions primarily for:
  • Side Milling (Finishing): Excellent for profile milling with high dimensional accuracy.
  • Slotting: Capable of handling shallow slots in tough materials.
  • Face Milling: Provides a smooth finish on flat surfaces.
Whether you are in aerospace, mold making, or general CNC machining, this tool reduces tool change frequency and improves production stability.

Product Features

  • Premium Substrate: Made from Ultra-Fine Micro Grain Tungsten Carbide, providing the perfect balance of hardness (HRC55-HRC65) and toughness to prevent chipping when cutting stainless steel.
  • Advanced Coating: Features a high-performance AlTiN / TiSiN Coating that offers high heat resistance and low friction coefficient, crucial for preventing built-up edge (BUE) common in stainless steel machining.
  • Rigid Design: The 4-flute geometry provides a larger core diameter compared to 2-flute or 3-flute mills, ensuring maximum rigidity and reduced deflection / vibration at high speeds.
  • Precision Tolerance: Shank diameter tolerance is controlled within h6, ensuring a tight run-out for high-precision CNC setups.

Specifications

We offer a full range of standard stock sizes ready for immediate shipment.
D Cutter Diameter (mm)
L2 Length of Cut (mm)
d Shank Diameter (mm)
L1 Over All Length (mm)
1.0
3.0
4.0
50
1.5
4.5
4.0
50
2.0
6.0
4.0
50
2.5
7.5
4.0
50
3.0
9.0
4.0
50
3.0
9.0
3.0
50
4.0
10.0
4.0
50
5.0
12.5
6.0
50
5.0
12.5
5.0
50
6.0
15.0
6.0
50
6.0
20.0
6.0
50
8.0
20.0
8.0
60
10.0
25.0
10.0
75
12.0
30.0
12.0
75
6.0
25.0
6.0
100
8.0
40.0
8.0
100
10.0
40.0
10.0
100
12.0
40.0
12.0
100

RPM/Feed (Reference for Stainless Steel)

Note: The following parameters are for reference when machining Stainless Steel (e.g., 304). Please adjust according to your machine rigidity and cooling method (Wet cooling recommended).
Cutter Dia (mm)
RPM (r/min)
Feed Rate (mm/min)
Feed per Tooth (fz)
1.0 - 2.0
8000 - 12000
150 - 300
0.005 - 0.008
3.0 - 4.0
5500 - 8000
300 - 500
0.015 - 0.025
5.0 - 6.0
4000 - 6000
450 - 700
0.030 - 0.040
8.0
3000 - 4500
500 - 800
0.040 - 0.050
10.0
2400 - 3500
600 - 900
0.050 - 0.065
12.0
2000 - 3000
650 - 1000
0.060 - 0.075

Promotion Policy

We value every partnership and offer exclusive support to help you test our quality and grow your business.
  1. Free Sample: Free sample can be provided, if clients agree to pay for shipping cost.
  1. First Order Coupon: New clients can enjoy USD50 discount coupon for the first order, if the total order amount is more than USD500.
  1. Big Order Discount: Clients can enjoy 2%~5% discount, if the total order amount is more than USD5000.

Clients Benefits

Why choose our Tungsten Carbide End Mills?
  • Direct Factory Pricing: Cut out the middleman. Save 30%+ on procurement costs.
  • Consistent Quality: 100% inspection with Zoller measuring instruments ensures every tool meets H6 tolerance.
  • Fast Shipping: As shown in the specification table, we keep massive stock of standard sizes (1mm-12mm) for immediate dispatch.
  • Technical Support: Our expert team is ready to assist with tool path optimization and parameter suggestions.

FAQ

Q1: Is this end mill suitable for hardened steel? A: This specific 4-flute model is optimized for Stainless Steel and general steels (up to HRC 45). For Hardened Steel (HRC 55-65), please check our "Blue Coating" or "High-Hardness" series.
Q2: What is the lead time for an order? A: For the items listed in the specification table, we have stock and can ship within 24-48 hours. For custom sizes, production takes 7-10 days.
Q3: Can I customize the coating or dimensions? A: Yes! We offer OEM/ODM services. We can customize the cutter diameter, shank, length, and coating (e.g., DLC, NaCo) based on your drawings.
Q4: How do you pack the tools? A: Each end mill is packed in a protective plastic tube with a laser-marked label specifying the size and batch number to ensure safety during transport.