The Carmex Carbide Tiny Tool - Boring Bar (BMK Grade) is a compact solid carbide cutting tool designed for internal boring and light turning on small workpieces. Built for precision and reliability, it’s ideal for machinists, engineers, technicians, and hobbyists who need a space-saving tool that can handle tight bores with confidence. This BMK-grade version features a sub-micron carbide substrate with an advanced PVD triple coating, delivering high heat resistance and smooth cutting across a broad range of materials.

With a 7.1 mm minimum diameter, 22 mm reach, and a left-hand cutting geometry (R0.2), this tiny bar is tuned for precise engagement in confined spaces while maintaining rigidity and consistent chip formation. It’s part of Carmex’s solid carbide bar family, engineered to deliver dependable performance and long tool life in demanding boring and turning applications.

• BMK-grade carbide with advanced PVD triple coating: Ultra-durable sub-micron carbide paired with triple coating provides high heat resistance and smooth cutting, helping extend tool life and maintain consistent finishes across materials.
• Compact boring bar geometry: 7.1 mm min diameter, 22 mm reach, left-hand R0.2: Small footprint that fits tight bores and pockets while delivering stable cutting and predictable results in confined spaces.
• General-purpose performance across materials: BMK’s coating and micro-grain structure support reliable cutting from softer materials to stainless steels, enabling a wide range of turning tasks with fewer tool changes.

This BMK-grade boring bar is designed to improve workflow by delivering consistent depth control, reduced chatter, and longer intervals between tool changes. Whether you’re finishing precision bores or performing routine turning in small parts, you can rely on steady performance, durable coatings, and a geometry that respects tight tolerances and repeatable results.