5/8″ x 4-1/2″ Square Tool Bit 8% Cobalt M42 HSS Lathe Turning Blank MPN 2000-0048

5/8″ x 5/8″ x 4-1/2″ Square Tool Bit – 8% Cobalt M42 (MPN: 2000-0048)

This listing is for a heavy-duty 5/8″ square tool bit blank. Designed for larger lathes and substantial metal removal rates, this bit provides the rigidity needed for heavy roughing cuts.

Manufactured from premium M42 High-Speed Steel with 8% Cobalt, it offers superior “red hardness” compared to standard tooling, making it the professional choice for machining tough alloys like Stainless Steel and Titanium.

Technical Specifications

• Dimensions: 5/8″ x 5/8″ Square (0.625″)
• Length: 4-1/2″ (115mm)
• Material Grade: M42 (8% Cobalt)
• Hardness: Heat treated to HRC 66-68
• Finish: Precision Ground on all sides.

Why Upgrade to M42 (8% Cobalt)? While standard M2 HSS is fine for mild steel, it fails quickly on abrasive or work-hardening materials. The 8% Cobalt matrix allows this tool to:

1. Resist Heat: Maintains cutting edge hardness at temperatures where standard HSS would soften.
2. Cut Harder Metals: Essential for turning Stainless Steel (304/316), Tool Steels, and Cast Iron.
3. Increase Productivity: Allows for higher surface speeds (SFM) and feed rates.

Common Applications

The 5/8″ shank is typically used on industrial or larger hobbyist lathes (e.g., 12″, 13″, or 14″ swing lathes).

• Heavy Roughing: The thick cross-section resists deflection (chatter) during deep cuts.
• Milling / Fly Cutting: Excellent for large fly cutter heads.
• Shapers & Planers: The high cobalt content withstands the heat and shock of shaping operations.

Fabrication Note: This is a tool blank. It requires grinding to create the specific cutting geometry (rake, relief, nose radius) suitable for your specific application.