The Carmex Carbide Tiny Tool - Boring Bar is a compact, solid carbide bar designed for precise boring and reliable general turning. With a 4.1 mm minimum diameter, a 15 mm reach, and an R0.05 corner radius, it delivers tight holes and consistent finishes in a range of machining setups. It’s ideal for engineers, machinists, and hobbyists who need dependable performance in small-diameter bores and challenging materials.

• TiN-coated for low-speed cutting: BXC grade provides dependable performance at lower cutting speeds and pairs well with stainless steels (ISO P30-P50 / K25-K40), helping improve edge life and reduce built-up edge.
• BMK sub-micron grade with triple PVD coating: This high-heat-resistant option delivers smooth cutting and lasting performance across a broad material mix (ISO K10-K20), keeping feeds steady and surfaces clean.
• Compact boring geometry for tight access: With 4.1 mm minimum diameter, 15 mm reach, and an R0.05 corner radius, it reaches small bores and tight pockets while maintaining stable, repeatable cuts.

Designed to integrate seamlessly into existing toolholders and workflows, this carbide boring bar helps you achieve consistent hole quality, reduce downtime, and extend tool life. The dual coating options give you flexibility across materials, so you can standardize tooling and rely on predictable results—from stainless steel workpieces to mixed-material runs—every time you cut.