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HSS Roughing End Mills for Aluminum

Engineered for high-speed aluminum roughing. Available in Standard HSS or wear-resistant HSS-Co (M35/M42). Features a scalloped edge combined with DLC Coating or Uncoated Mirror-Polish to eliminate built-up edge (BUE) and maximize chip evacuation.

HSS / HSS-Co (M35/M42) 3 Flutes DLC or Uncoated Large Gullet Design Aluminum Roughing Specialist
View Specifications Request Bulk Pricing
HSS Roughing End Mills for Aluminum
HSS Roughing End Mills for Aluminum

Procurement & Commercial Terms

MOQ1 pc (sample/stock) | 50 pcs (OEM/bulk)
Lead TimeSame day dispatch (standard stock) | 7–10 days (custom/OEM)
InventoryD6mm–D20mm full range in stock. Both standard and extra-long lengths available.
Material & CoatingSubstrate: HSS or HSS-Co (M35 / M42) | Coating: DLC or Uncoated (Mirror Polish)
PackagingIndividual plastic tubes + anti-rust paper | Rigid export cartons (50/100 pcs)
ShippingDHL/FedEx/UPS for samples | Air/Sea freight for bulk. Incoterms: EXW, FOB, CIF, DDP

HSS & HSS-Co 3-Flute Aluminum Roughing Specifications

Product Configuration:      Material: Standard HSS or HSS-Co (M35/M42) |      Coating: DLC or Uncoated |      Edge: Scalloped (Roughing)
ModelD (mm)H (mm)d (mm)L (mm)Stock
HSALR-3F-6-19-6-60619660● In Stock
HSALR-3F-8-25-8-66825866● In Stock
HSALR-3F-10-25-10-7510251075● In Stock
HSALR-3F-12-35-12-8512351285● In Stock
HSALR-3F-14-35-12-8514351285● In Stock
HSALR-3F-16-42-16-9516421695● In Stock
HSALR-3F-18-42-16-9518421695● In Stock
HSALR-3F-20-50-20-110205020110● In Stock
ModelD (mm)H (mm)d (mm)L (mm)Stock
HSALR-3F-6-25-6-68625668● In Stock
HSALR-3F-8-38-8-83838883● In Stock
HSALR-3F-10-45-10-9510451095● In Stock
HSALR-3F-12-53-12-110125312110● In Stock
HSALR-3F-14-53-12-110145312110● In Stock
HSALR-3F-16-63-16-123166316123● In Stock
HSALR-3F-18-63-16-123186316123● In Stock
HSALR-3F-20-75-20-141207520141● In Stock

● All sizes in stock | Diameter tolerance: h6. Custom sizes available upon request.

Application Note: Scalloped (roughing) edges leave a textured surface finish. They are strictly designed for heavy stock removal. For final fine finishing passes requiring a smooth surface roughness (Ra) in aluminum, we recommend switching to our standard 3-flute aluminum end mills from the Aluminum Series.

Why Choose Our Aluminum Roughing End Mills?

Large Gullet Design

The 3-flute geometry provides 40% more chip clearance than 4-flute tools. This is critical for aluminum roughing to prevent chip clogging, re-cutting, and catastrophic tool failure.

DLC / Mirror Polish

DLC coating offers an ultra-low friction coefficient (<0.1). Uncoated versions feature precision mirror-polished flutes. Both prevent soft aluminum from welding to the scalloped edges (BUE).

High Helix Angle

Optimized with a higher helix angle (typically 45°) to shear aluminum efficiently. This reduces axial cutting forces, minimizing part vibration and deflection during aggressive roughing.

HSS-Co Abrasion Resistance

When roughing high-silicon aluminum (7075, cast Al), the silicon particles are highly abrasive. HSS-Co (M35/M42) drastically improves wear resistance, extending tool life in continuous production.

CAM Setup & Cutting Parameters Guidance

Recommended Cutting Data (HSS-Co + DLC)
Workpiece MaterialCutting Speed (Vc)Feed per Tooth (fz)Radial Engagement (ae)
Aluminum (6061, 5052)300 - 600 m/min0.08 - 0.20 mm/tooth50% - 80% of D
High-Silicon Aluminum (7075)200 - 400 m/min0.06 - 0.15 mm/tooth40% - 60% of D
Copper / Brass150 - 300 m/min0.06 - 0.15 mm/tooth40% - 60% of D

*For standard uncoated HSS, reduce Cutting Speed (Vc) by approximately 15-20% to maintain edge integrity.

Best Practices for Aluminum Roughing
  • ⚠️ Always Use Climb Milling - Conventional milling pushes chips back into the cut, causing re-cutting and built-up edge in aluminum.
  • ⚠️ Maximize Chip Evacuation - Use high-pressure air blast to clear chips from the large gullets. Clogged flutes are the #1 cause of tool failure.
  • ⚠️ Avoid Dwell Marks - Maintain a constant feed rate. Pausing the tool in the cut will cause the aluminum to weld to the scalloped edge.
  • ⚠️ Rigidity is Key - Keep tool overhang to an absolute minimum. Use the shortest possible length of cut (H) for your application to prevent chatter.
  • ⚠️ DLC Care - While DLC is incredibly hard, it can be brittle. Avoid heavy interrupted cuts or dropping the tool into the material.

Factory Production & Quality Control

HSS aluminum roughing end mill grinding and polishing

Manufacturing Process & QA Steps

  • 🔹 Raw Material: Premium HSS and HSS-Co (M35/M42) steel blanks sourced from certified mills.
  • 🔹 Grinding: 5-axis CNC tool grinders create the precise 3-flute geometry, high helix angle, and scalloped edge for optimal chip flow.
  • 🔹 Polishing: Uncoated versions undergo a specialized mirror-polishing process on the flutes to minimize friction.
  • 🔹 Coating: DLC coating applied via advanced PVD process, ensuring uniform thickness and strong adhesion without altering the sharp edge.
  • 🔹 Inspection: 100% visual inspection under microscope. Batch sampling for coating thickness, hardness, and real-world aluminum cutting tests.

Frequently Asked Questions

Aluminum produces large, gummy chips. A 3-flute roughing mill provides significantly larger gullets (chip clearance) than a 4-flute tool. This prevents chip clogging and re-cutting, which are the primary causes of tool failure and built-up edge (BUE) in aluminum machining.

DLC (Diamond-Like Carbon) has an ultra-low friction coefficient (<0.1). During aggressive roughing, this prevents soft aluminum from welding to the scalloped cutting edges, allowing for higher spindle speeds, better chip flow, and a significantly extended tool life.

Standard HSS is excellent for general aluminum (like 6061). However, if you are roughing high-silicon aluminum alloys (like 7075 or cast aluminum), the silicon particles are highly abrasive. HSS-Co (M35/M42) provides superior wear resistance against this abrasion, preventing premature flank wear.

Request Quote for HSS Roughing End Mills for Aluminum

Specify your diameter range, material, and monthly volume. We respond with pricing, stock status within 24 hours.

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