Value Collection 314-4378 Round Die 1-8 Unc 2 in Od Lh Hss

Product Description

The VALUE COLLECTION 314-4378 is a round threading die designed to cut 1-8 UNC left-hand external threads on round stock. Manufactured from high-speed steel (HSS), this die maintains cutting edge integrity under the heat and friction generated during thread forming. The 2-inch outside diameter fits standard round die stocks and holders commonly found in machine shops and trade environments. The adjustable design allows the operator to fine-tune thread fit by slightly expanding or contracting the die body, enabling cleanup passes and tolerance control. Machinists, toolmakers, and maintenance technicians working with left-hand threaded fastener applications are the primary users of this die.

This die is suited for applications where left-hand UNC threads are required, such as mechanical assemblies that use reverse-thread fasteners to prevent loosening under rotational load. Typical use scenarios include repair threading, custom fabrication, and production runs requiring 1-8 UNC left-hand thread profiles. The 2-inch OD size is a common industrial standard, making this die compatible with a wide range of matching die stocks and holders designed for that diameter. It is appropriate for use in both shop and field maintenance contexts where manual or machine-assisted threading is performed.

Key Features

• High-speed steel construction resists heat buildup and wear during thread cutting
• Adjustable die body allows fine-tuning of thread fit and tolerance
• Left-hand thread direction for reverse-thread fastener applications
• 1-8 UNC thread standard for common coarse-thread inch fastener work
• 2-inch outside diameter fits standard round die stocks and holders

Compatibility

Designed for use in standard round die stocks and holders accepting a 2-inch OD die. Intended for cutting 1-8 UNC left-hand external threads on compatible workpiece materials suitable for high-speed steel tooling.

Installation Notes

This die is installed and secured in a matching round die stock before use. Ensure the die is properly seated and the set screws are engaged before beginning thread cutting. Apply appropriate cutting fluid to the workpiece to extend tool life and improve thread finish. Left-hand dies must be turned counterclockwise when viewed from the cutting face to advance the thread correctly.