Cle-line C65048 Round Threading Die 4-40 Unc Carbon Steel

Product Description

The CLE-LINE C65048 is an adjustable round threading die designed to cut 4-40 UNC external threads on fasteners, studs, and rod stock. Made from carbon steel, it delivers consistent thread geometry in production and repair applications. The die measures 0.8125 inches in outside diameter and 0.25 inches thick, fitting standard round die stocks of the same OD class. Right-hand thread direction is the default for 4-40 UNC work. The adjustable design allows the cutting faces to be set for roughing or finishing passes, giving machinists and maintenance techs control over fit tolerance without changing tooling.

This die is suited for light-duty threading in machine shops, maintenance facilities, and field service kits where 4-40 fastener fabrication or thread restoration is needed. The 4-40 UNC thread size is common in instrument panels, electronics enclosures, and precision mechanical assemblies. It is used by machinists, tool and die technicians, and maintenance mechanics working on small-diameter fastener applications in both bench and hand-tool setups.

Key Features

• Adjustable cutting faces allow roughing and finishing passes with a single die
• Right-hand thread direction matches standard 4-40 UNC fastener orientation
• Carbon steel construction provides adequate hardness for threading mild steel, brass, and aluminum stock
• 0.8125 inch outside diameter fits standard round die stocks of that OD class
• 0.25 inch thickness suits shallow die stock holders common in hand threading sets
• Series 0610 designation for cross-referencing within the CLE-LINE die lineup

Compatibility

Designed as an OEM-style replacement or direct-fit threading die for standard round die stocks accepting a 0.8125 inch outside diameter die in the 4-40 UNC thread size.

Installation Notes

This die is installed and operated by machinists or mechanics using a round die stock wrench sized for 0.8125 inch OD dies. Secure the die firmly in the stock before use and apply cutting oil to the workpiece to extend die life and improve thread quality. For adjustable dies, set the adjustment screw for a roughing pass first, then close to final dimension for the finishing pass. Inspect threads with a 4-40 go/no-go gauge after cutting to verify fit.