FANAR Filiera tonda M20 x 2,5 sinistra HSS DIN 223

In a busy maintenance workshop, a technician faces a stripped left-hand threaded shaft on a rotating assembly. Replacing the entire component would mean costly downtime, but with the FANAR M20 left-hand threading die, the damaged threads are restored cleanly and precisely in minutes. This round die is cut from high-speed steel (HSS) and ground to DIN 223, delivering clean, accurate external threads on rods and bolts with a 20 mm nominal diameter and 2.5 mm pitch. The left-hand direction is essential for applications where rotation would loosen a right-hand thread, such as on certain bicycle pedals, turnbuckles, or industrial machinery.

Key specifications

• Thread type: Metric coarse, left-hand
• Nominal diameter: M20
• Pitch: 2.5 mm
• Material: High-speed steel (HSS), bright finish
• Outer diameter: 45 mm, thickness: 14 mm
• Tolerance class: 6g
• Standard: DIN 223
• Compatibility: Die stocks for 45 x 14 mm dies

Why choose it

This die is built for durability and accuracy. The HSS construction resists wear and heat, while the ground threads ensure a smooth cutting action and consistent thread quality. The left-hand orientation is a specialized feature that is hard to find in general hardware stores, making this tool a valuable addition for professionals who work with reverse-threaded fasteners. Its standard outer dimensions allow it to fit common die stocks, so you can use it manually or in a machine setup.

Ideal use cases

• Cutting new left-hand M20 threads on rods or shafts
• Repairing damaged threads on existing left-hand fasteners
• Creating custom bolts or studs for machinery with reverse threads
• Maintenance of bicycle pedals, turnbuckles, and industrial equipment

Good to know

The die is manufactured to DIN 223, ensuring consistent dimensions and performance. The bright finish provides corrosion resistance and a clean appearance. It is suitable for both manual threading with a die stock and machine threading operations.