5/16″ x 6″ Square Tool Bit M35 5% Cobalt HSS Extra Long Blank MPN 2000-0025

5/16″ x 6″ Square Tool Bit M35 5% Cobalt HSS Extra Long Blank | MPN 2000-0025

5/16″ x 6″ Extra Long Square Tool Bit – M35 5% Cobalt (MPN: 2000-0025)

This listing is for a high-performance 5/16″ square tool bit blank featuring an Extra Long 6-inch length.

Most tool bits in this width are only 2.5″ long. This 6″ blank provides exceptional value, offering double the lifespan (more regrinds per bit) or the extended reach needed for specialized setups.

Manufactured from M35 High-Speed Steel with 5% Cobalt, this tool is designed to outperform standard M2 HSS when cutting harder materials or operating at higher temperatures.

Technical Specifications & Material Benefits

• Dimensions: 5/16″ x 5/16″ Square
• Length: 6″ (150mm) – Rare Extra Long Size
• Material Grade: M35 (5% Cobalt)
• Hardness: HRC 65-67
• Finish: Ground finish, ready for shaping.

The M35 Cobalt Advantage: Standard HSS bits can lose their temper (soften) under the high heat generated by cutting tough metals. The 5% Cobalt content in M35 steel increases heat resistance (“Red Hardness”) and wear resistance.

• Ideal for: Stainless Steel, High-Carbon Steel, and Cast Iron.
• Durability: Holds a sharp edge longer than standard M2 bits, reducing downtime for sharpening.

Common Applications

This versatile blank is a favorite among machinists for:

• Mini & Bench Lathes: The 5/16″ size is perfect for smaller lathe tool posts (like Sherline, Taig, or 7x series) where high performance is needed.
• Fly Cutters: The extra 6″ length makes this bit excellent for use in fly cutter heads on milling machines, allowing for a larger sweep diameter.
• Custom Profiles: Grind your own threading tools, grooving tools, or form tools.

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