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A Left Hand Threading Tool Holder is a specialized tool holder designed to securely hold threading inserts specifically for cutting left-hand screw threads on a workpiece, typically on a lathe or CNC machine. Unlike right-hand threading tool holders, which cut threads when fed from right to left (towards the chuck), left-hand threading tool holders are used when the feed direction is from left to right (away from the chuck). This is essential for creating threads that engage with mating parts in a counter-clockwise direction.

The primary function of a Left Hand Threading Tool Holder is to provide a stable and precisely angled platform for the left-hand threading insert. This ensures accurate thread profiles, consistent pitch, and proper thread depth. These holders are engineered to withstand the cutting forces involved in thread cutting, often requiring multiple passes. The design of the holder dictates the correct orientation of the insert relative to the workpiece for left-hand thread formation.

Identifying a left-hand threading tool holder is usually straightforward, often indicated by markings or the direction in which the insert is oriented. They are crucial for specific applications where left-hand threads are required for functional or design reasons. Just like their right-hand counterparts, left-hand threading tool holders come in various styles to accommodate different thread types (metric, UNC, etc.) and insert sizes. Choosing the correct left-hand threading tool holder is vital for achieving accurate and high-quality left-hand threads efficiently.