Value Collection 314-4258 Round Die 7/16-20 Unf Lh Hss

Product Description

The VALUE COLLECTION 314-4258 is a round threading die designed to cut external left-hand threads at the 7/16-20 UNF specification. Made from high-speed steel (HSS), it delivers the hardness and heat resistance required for repetitive threading on ferrous and non-ferrous metals. The adjustable design allows the operator to fine-tune the die for a tighter or looser thread fit, improving thread quality and extending die life. Machinists, tool and die makers, and maintenance mechanics rely on this die for fabricating or rethreading left-hand fasteners in mechanical assemblies where reverse-thread configurations are required.

This die is suited for manual or bench-mounted die stock use in machine shops, maintenance facilities, and production environments. The 7/16-20 UNF left-hand thread specification makes it the correct choice when working on assemblies that use reverse-thread hardware to prevent loosening under rotational load — common in automotive, industrial equipment, and tool spindle applications. It is sold individually and is ready to use with a standard round die stock holder sized for its die body diameter.

Key Features

• Left-hand thread cutting: produces 7/16-20 UNF reverse-direction external threads
• High-speed steel construction for wear resistance and durability across repeated use cycles
• Adjustable die body allows fine control over thread fit and tolerance
• UNF (Unified National Fine) thread standard for precise, fine-pitch thread profiles
• Sold as a single die — no additional units included

Compatibility

Designed for use with standard round die stock holders accepting the appropriate die body diameter. Suitable for threading 7/16-inch diameter stock to a 20 TPI left-hand UNF specification.

Installation Notes

This die is installed and operated by machinists or qualified maintenance personnel using a compatible round die stock. Secure the die firmly in the die stock before use and apply cutting oil to the workpiece to reduce friction and improve thread finish. Always confirm the workpiece diameter is within the correct tolerance range for a 7/16-20 thread before beginning the cut. Inspect the die for wear or chipping before each use.