Carmex Carbide Tiny Tool - Boring Bar - MTL - BMK Grade - 4.1mm Minimum Diameter x 10mm Reach x R0.2 (Left Hand)

The Carmex Carbide Tiny Tool is a compact, solid carbide boring bar designed for precise internal work in small diameters. With a 4.1 mm minimum diameter, 10 mm reach, and a left-hand R0.2 cutting edge, it’s built for accurate bore operations and light turning tasks in metalworking shops, job shops, and hobby setups that demand tight tolerances.

This tool family covers two coating grades to match your material and speed needs. BMK is a sub-micron carbide grade with an advanced PVD triple coating (ISO K10-K20), delivering excellent heat resistance and a smooth cutting action for demanding materials. BXC features a PVD TiN coating tailored for low cutting speeds and broad stainless-steel compatibility (ISO P30-P50 / K25-K40), making it a reliable choice for general turning and boring.

• Compact geometry for tight bores: The 4.1 mm minimum diameter, 10 mm reach, and left-hand R0.2 edge let you access small internal diameters with stable engagement and clean finishes in confined spaces.
• Coated carbide for longer tool life: BMK’s sub-micron carbide with triple PVD coating provides high heat resistance and smooth cutting, reducing wear and extending intervals between tool changes.
• Versatile material compatibility: The BXC coating option with TiN supports low-speed cutting on a wide range of stainless steels and general turning, expanding the tool’s applications beyond boring.

This tiny boring bar is designed to improve accuracy and uptime in busy shops. Its precise geometry, combined with the BMK or BXC coating options, helps you hold tight tolerances, finish surfaces smoothly, and complete internal passes with fewer tools changes. Choose BMK for high-temperature performance on demanding materials, or BXC for reliable stainless-steel and general turning tasks—all while maintaining consistent results across parts.