Osg 2728300 Round Threading Die 12-24 Unc Hss

Product Description

The OSG 2728300 is a round threading die designed to cut external 12-24 UNC threads on ferrous workpieces. Built from high-speed steel, this die delivers consistent thread form across iron and steel materials in both shop and field applications. At 0.8125 inches outside diameter and 0.25 inches thick, it fits standard round die holders for that size range. The adjustable design allows the operator to fine-tune thread fit by slightly expanding or compressing the die using the holder set screws, giving useful control over thread tolerance class. Licensed machinists, toolroom mechanics, and maintenance technicians are the primary users.

This die is suited for production threading, repair threading, and maintenance work where a 12-24 UNC external thread is required. Common applications include tapping machine screws, fastener rework, and repair of threaded studs in ferrous components. The right-hand thread direction covers the vast majority of standard fastener configurations. It is appropriate for use on manual die stocks and machine die holders sized for 0.8125-inch round dies.

Key Features

• 12-24 UNC thread form, right-hand direction
• High-speed steel construction for durability on iron and steel workpieces
• Adjustable design allows thread tolerance fine-tuning via die holder set screws
• 0.8125 inch outside diameter fits standard round die holders for that size
• 0.25 inch thickness suits shallow-depth die stock applications
• OSG Series 134 designation for cross-reference and replacement sourcing

Compatibility

Designed for use on iron and steel workpieces requiring a 12-24 UNC right-hand external thread. Fits round die holders accepting a 0.8125-inch outside diameter die.

Installation Notes

Threading dies should be installed in a properly sized round die stock or holder and secured with set screws before use. Apply cutting oil or thread-cutting fluid to the workpiece before starting the thread to extend die life and improve thread quality. Ensure the workpiece is chamfered at the lead end to allow the die to start squarely. Inspect the die for cracks or chipped teeth before each use and replace if damaged.