Value Collection 366-0561 Hex Rethreading Die 7/8-9 Lh Unc

Product Description

The VALUE COLLECTION 366-0561 is a hex rethreading die designed to restore damaged or corroded external threads to their original specification. Built from carbon steel, this die handles 7/8-9 thread size in a left-hand direction to the UNC thread standard. Rethreading dies like this one are used to clean and restore existing threads rather than cut new ones from scratch, making them a fast, cost-effective repair tool. Machinists, millwrights, and maintenance technicians reach for this type of die when bolt or stud threads are stripped, galled, or rusted beyond normal use.

This die is suited for repair and maintenance work in industrial, mechanical, and manufacturing environments where left-hand threaded fasteners are present. Left-hand thread configurations are common in applications where rotation would otherwise loosen a standard right-hand fastener, such as certain motor shafts, bicycle components, and specialty machinery. The 7/8-9 UNC specification matches a coarse-thread profile used across a wide range of heavy mechanical assemblies.

Key Features

• 7/8-9 thread size for coarse-pitch UNC external thread restoration
• Left-hand thread direction for use on reverse-threaded fasteners
• Carbon steel construction provides adequate hardness for rethreading steel and softer fastener materials
• Hex outer profile allows use with a standard die stock or adjustable wrench
• Compact and lightweight at 0.2 pounds for easy handling

Compatibility

Designed as an OEM-style replacement or standard-inventory rethreading die for use on 7/8-9 UNC left-hand external threads on bolts, studs, and threaded rod.

Installation Notes

This die is installed and operated by machinists or maintenance technicians familiar with hand threading tools. Secure the workpiece before use and apply appropriate cutting oil to the die and fastener to reduce friction and extend die life. Always confirm the thread direction of the fastener before selecting a left-hand die, as using the wrong direction will damage both the die and the workpiece. Inspect the die for cracks or wear before each use.