The Carmex Carbide Tiny Tool - Boring Bar (MTR, K20 Grade) is a compact solid carbide bar built for precision in small bores and fine turning. With a 5.1 mm minimum diameter, 10 mm reach, and a tight R0.2 nose radius, it delivers accurate, clean cuts in tight spaces and helps you finish workpieces to exact specifications.

This tool line combines robust carbide with advanced coatings to cover a wide range of materials and cutting speeds. It includes the BMK K20-grade option, featuring a sub-micron carbide with a triple PVD coating for outstanding heat resistance and smooth cutting, plus the BXC TiN-coated grade designed for reliable performance at lower cutting speeds, particularly with stainless steels. Although designed for boring, it also handles general turning applications with dependable results.

• BMK K20-grade carbide with triple PVD coating: Sub-micron carbide structure coupled with a advanced coating delivers exceptional heat resistance and smooth, consistent cutting for long tool life across many materials.
• BXC TiN-coated option for low-speed cutting and stainless steels: Optimized performance at reduced speeds on stainless steels, helping produce clean surfaces and stable finishes.
• Compact boring bar geometry: 5.1 mm min diameter, 10 mm reach, R0.2: Precisely scaled dimensions enable accurate boring in tight spaces while maintaining rigidity and finish quality.

With its combination of tough carbide, specialized coatings, and precise geometry, this tiny tool supports reliable, repeatable results from the first bore to the last. It helps streamline setups, reduces the need for tool changes on small or intricate workpieces, and delivers consistent performance across a broad range of materials, including stainless steels, making it a versatile choice for both professional shops and dedicated hobbyist setups.