The Carmex Carbide Tiny Tool Boring Bar is a compact, solid carbide tool designed for precise internal boring and small-diameter turning. With a 4.1 mm minimum diameter, 22 mm reach, and a left-hand R0.1 nose, it provides direct access to tight bores and confined features in metal parts. This TNX-grade tool is built for reliable performance in demanding shop environments, making it a dependable choice for engineers, machinists, and hobbyists alike.

Two coating options tailor the tool to your material and speed. BXC is a PVD TiN-coated grade optimized for low cutting speeds and a wide range of stainless steels (ISO P30-P50 / K25-K40). BMK is a sub-micron grade with an advanced PVD triple coating, delivering extremely high heat resistance and smooth cutting across a broad material spectrum (ISO K10-K20).

• Small-diameter bore capability: 4.1 mm minimum diameter and 22 mm reach with left-hand geometry enable direct access to tight internal bores and compact features, reducing setup and tool-change requirements.
• Coating-optimized versatility: BXC TiN coating excels on stainless steels at low speeds, while BMK’s triple coating delivers high heat resistance and smooth cutting for diverse materials.
• Rigid, durable carbide construction: Solid carbide delivers stiffness and wear resistance for longer tool life, stable cuts, and consistent hole quality across demanding boring and turning applications.

This tiny boring bar helps you complete precise internal bores efficiently, improving workflow and reducing downtime. The combination of compact geometry, grade options, and proven carbide durability supports reliable results on stainless steels and other materials, making it a trusted choice for valve bodies, bushings, fittings, and other small-diameter components where accuracy and repeatability matter.