Carmex Carbide Tiny Tool - Boring Bar, MTR, BXC Grade is a compact solid carbide bar engineered for precision in small-diameter boring and reliable turning. With a 4.1 mm minimum diameter, a 22 mm reach, and a 0.05 mm nose radius, it handles tight holes and shoulders with consistent accuracy. This tool is designed for engineers, machinists, and hobbyists who need dependable performance in a compact form factor.

The product line combines coated carbide options to match different materials and applications. The BXC grade uses a PVD TiN coating for low cutting speeds and excellent stainless steel compatibility (ISO P30-P50 / K25-K40), delivering smooth cuts and longer tool life in challenging steels. For demanding jobs, the BMK variant provides a sub-micron grade with a triple PVD coating, delivering exceptional heat resistance and consistently smooth cutting across a wide range of materials.

• Small-diameter, long-reach boring capability: Optimized for precise holes in tight pockets and through-holes, with a 4.1 mm minimum diameter, 22 mm reach, and a 0.05 mm nose radius for clean, accurate finishes.
• TiN-coated BXC grade for low-speed stainless steel cutting: PVD TiN coating reduces wear and friction at low cutting speeds, extending tool life and enabling reliable performance on ISO stainless steels P30-P50 / K25-K40.
• BMK option for high heat resistance and smooth cutting: Sub-micron grade with advanced triple coating delivers superior heat tolerance and stable, smooth cuts across a broad material range.

Together, these features help you complete boring and turning tasks more efficiently: you gain repeatable hole quality, longer tool life, and fewer tool changes. The combination of compact geometry and durable coatings supports quicker setups, reduced downtime, and dependable results across production runs and prototyping projects alike.