Threading die left-hand FANAR M4 N1-111001-0040 — left-hand metric die for M4 threads

The FANAR left-hand threading die for M4 threads (left-hand metric die) is designed to create or restore external left-hand M4 threads on rods and fasteners. This compact metric die is suitable for handheld use with compatible die holders or for machine-assisted threading in maintenance and metalworking environments. Constructed for precision cutting of left-hand M4 threads, the tool is intended for rethreading, repair and production of small-diameter external threads where left-hand orientation is required.

Advantages

The die offers precise tooth geometry for consistent left-hand M4 thread profiles and reliable thread engagement. Its compact, standardized form allows compatibility with common die holders and clamping tools, simplifying interchangeability during repair or production work. The tool is suitable for repeatable manual threading and for light machine use, enabling efficient rethreading of damaged fasteners and accurate production of new external threads.

Suitable for

• Cutting new left-hand M4 external threads on rods and bolts
• Reforming or repairing damaged left-hand M4 threads
• Maintenance and assembly tasks requiring left-hand metric threads
• Small-scale production and prototyping of left-hand M4 threaded parts

Key specifications

• Thread type: left-hand metric external thread
• Nominal size: M4
• Use: hand-held with die holder or machine-assisted light threading
• Application: cutting, rethreading and repair of external threads
• Compatibility: standardized die form for common die holders

How to use

Secure the die in a compatible die holder or appropriate clamping tool ensuring correct orientation for left-hand threading. Align the die squarely with the workpiece end and start the cut with steady, controlled turns while maintaining perpendicular alignment. Use cutting lubricant suitable for the workpiece material to reduce friction and improve chip evacuation. Advance the die one turn at a time then reverse slightly to break chips and prevent clogging; continue until the required thread length is achieved. After cutting, clean the thread and inspect with a mating nut or thread gauge to verify fit and thread quality.

Usage recommendations

For best results, use appropriate cutting fluid and a die holder sized to the die. When rethreading damaged bolts, remove burrs and ensure the workpiece end is chamfered before applying the die. For hardened or abrasive materials, consider pre-drilling to the correct rod diameter and apply steady, controlled feed; if material hardness exceeds die specifications, use tooling designed for harder materials or seek a replacement die with appropriate cutting geometry.