The Carmex Carbide Threading Insert - UNJ, TiAlN Coated (model 21E16UNJ) is a versatile, high-precision cutting solution built for professional machining where reliable multi-profile threading is essential. Designed for machinists who want fewer tool changes and consistent results across common thread forms.

• Thread profiles covered: A comprehensive collection of carbide threading inserts that span all common thread profiles to support diverse projects.
• Lengths and pitches: Five lengths from 12 mm to 40 mm, enabling pitches from 0.5 mm (32 TPI) up to 6.0 mm (4 TPI) to match your job requirements.
• Double-sided cutting edges: Each insert offers two cutting edges for extended tool life (except BSPT/NPT/NPTF/American Buttress/API RD variants).
• Internal and external compatibility: For many thread profiles, the same insert can machine both internal and external threads, simplifying tooling (excludes ISO/UN/NPSM/UNJ/Acme).
• Coating and construction: TiAlN coating enhances hardness and wear resistance, helping maintain accuracy and prolonging insert life on demanding materials.
• Model designation: Identified as 21E16UNJ, a reliable choice for UNJ and related threading tasks.

Benefits: This single, well-structured set reduces the need to stock multiple single-profile inserts. Its TiAlN-coated carbide construction delivers durable performance under higher cutting speeds and temperatures, helping you achieve clean, precise threads with fewer passes. The dual-edge design and cross-profile compatibility mean fewer tool changes, lower downtime, and consistent results whether you’re threading internal bores or external shafts. Ideal for shops handling automotive, aerospace, and precision mechanical components where UNJ and other standard thread forms are routine.