3/8″ x 6″ Square Tool Bit M35 5% Cobalt HSS Extra Long Blank MPN 2000-0028

3/8″ x 6″ Extra Long Square Tool Bit – M35 5% Cobalt (MPN: 2000-0028)

This listing is for a premium 3/8″ square tool bit blank featuring an Extra Long 6-inch length.

Standard 3/8″ tool bits are typically only 3 inches long. This 6″ blank offers incredible value, providing twice the usable life (more regrinds) or the reach needed for deep facing or specialized fly cutting setups.

Made from M35 High-Speed Steel with 5% Cobalt, this bit is engineered to cut tough materials that would dull standard HSS bits instantly.

Technical Specifications

• Dimensions: 3/8″ x 3/8″ Square (0.375″)
• Length: 6″ (150mm) – Extra Long Series
• Material Grade: M35 (5% Cobalt)
• Hardness: Heat treated to HRC 65-67
• Finish: Precision Ground

The M35 Advantage (5% Cobalt):

• High Heat Resistance: The cobalt content allows the tool to maintain its hardness even at high cutting temperatures (“Red Hardness”).
• Tough Material Capability: Excellent for machining Stainless Steel, Alloy Steels, and Cast Iron.
• Versatility: M35 offers a great balance of hardness and toughness, making it less prone to chipping than higher cobalt grades (M42) during interrupted cuts.

Common Applications

The 3/8″ size is the “workhorse” for many medium-sized bench lathes (e.g., 9×20, 10×22, South Bend).

• Lathe Turning: Ideal for turning, facing, and thread cutting.
• Fly Cutters: The 6″ length makes this bit perfect for fly cutter holders in milling machines, allowing for a wide sweep to face large blocks of material in a single pass.
• Custom Tooling: Easily ground into form tools for specific grooves or radii.

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.