Thread chaser (left-hand) FANAR M20x1.5 N1-111001-0205

Thread chaser (left-hand) FANAR M20x1.5 N1-111001-0205 is a precision tool designed to restore or clean damaged or corroded left-hand M20×1.5 metric threads. Built for use on internal and external threads where left-hand (reverse) rotation is required, this FANAR thread chaser matches the M20 diameter and 1.5 mm pitch to reliably re-establish thread form without removing significant material. The tool is intended for maintenance, repair and assembly tasks in mechanical, automotive and industrial environments where accurate left-hand threads are needed.

Advantages

The FANAR left-hand thread chaser offers accurate thread restoration with minimal material removal, preserving component fit and function. Its geometry is optimized for cleaning debris, corrosion and light damage from the thread flanks and roots, improving engagement and reducing cross-threading risk. The tool is compatible with common holding methods and hand-turning or machine-assisted use, allowing controlled application in workshop and field conditions. Durable construction provides repeated use under routine maintenance workloads.

Suitable for

• Repairing damaged or worn left-hand M20×1.5 internal threads
• Cleaning left-hand M20×1.5 external threads from debris and corrosion
• Automotive maintenance requiring left-hand metric thread restoration
• Industrial assembly and equipment servicing with left-hand fasteners
• Routine mechanical maintenance and field repairs

Key specifications

• Thread form: metric, left-hand
• Nominal diameter: 20 mm
• Thread pitch: 1.5 mm
• Intended use: internal and external thread restoration/cleaning
• Material and finish: hard-wearing tool steel (manufacturer-specified)

How to use

Select the thread chaser when the damaged thread matches the M20×1.5 left-hand profile. Secure the workpiece to prevent movement, align the chaser with the thread axis and start slowly by hand to ensure correct engagement. For internal threads, rotate the chaser in the left-hand (reverse) direction to cut or clean the thread; for external threads, apply the appropriate reverse rotation as required. Use steady, even pressure and back off periodically to clear chips or debris. For deeper or heavily damaged threads, multiple light passes are preferable to aggressive cutting to avoid further damage.

Usage recommendations

Inspect threads before and after use to confirm fit and detect any remaining damage. Use light cutting oil or lubricant when restoring corroded or seized threads to reduce friction and improve chip evacuation. Avoid forcing the tool through severely damaged threads; if resistance is high, assess the component for re-tapping, re-threading or replacement. Store the thread chaser in a protective sleeve or holder to preserve cutting edges between uses.