The Carmex Carbide Tiny Tool Boring Bar is a compact, solid carbide cutting tool designed for precise internal boring and reliable general turning. With a 5.1 mm minimum diameter, 22 mm reach, and an R0.2 nose, it delivers accurate bore sizes in tight spaces while staying rigid enough for demanding machining. Built on an MTR K20 grade for durability, this tiny bar is a dependable choice for engineers, machinists, and hobbyists alike.

• BXC TiN coated for low-speed precision: The TiN-coated grade is optimized for low cutting speeds, reducing friction and extending tool life when boring stainless steels and other tough materials (ISO P30-P50 / K25-K40).
• BMK PVD triple coating for high heat resistance: Sub-micron BMK grade with advanced PVD triple coating delivers exceptional heat tolerance and a smooth cutting action across a wide range of materials (ISO K10-K20).
• Versatile boring-to-turn capability: Although designed for boring, this carbide bar handles general turning tasks as well, simplifying setups and reducing tool changes in mixed operations.

This tiny carbide boring bar combines a robust MTR-K20 body with specialized coatings to deliver consistent, accurate results in tight bores and across diverse materials. Its high rigidity and coating-driven performance help minimize downtime, improve surface finish, and provide reliable tool life—even under demanding shop conditions. Whether you're working on stainless steels or other common alloys, you can depend on clean, repeatable cuts and predictable results with every pass.