Eagle Cutting Tool CHD-440-I 4-40NC Carbon Hex Rethread Die

Product Description

The EAGLE CUTTING TOOL CHD-440-I is a 4-40NC carbon hex rethread die designed to restore damaged or corroded external threads on 4-40 unified coarse fasteners. The hexagonal body allows standard open-end or box wrenches to drive the die without a dedicated die stock, making it a practical addition to a field technician's thread repair kit. It is used across plumbing, electrical, HVAC, and general mechanical trade work wherever small-diameter machine screw threads require cleanup or restoration rather than full re-cutting from blank stock.

This rethread die suits light-duty thread restoration tasks on 4-40NC threaded rods, machine screws, and fasteners found in control panels, electrical enclosures, and mechanical assemblies. The hex body profile is compatible with standard wrenches, eliminating the need for a round die wrench in field applications. It is appropriate for use by electricians, HVAC technicians, plumbers, and general maintenance trades working on equipment with 4-40 unified coarse threaded fasteners.

Key Features

• 4-40NC thread profile for unified coarse thread restoration on small-diameter fasteners
• Hex body design accepts standard open-end or box wrenches for wrench-driven operation without a die stock
• Carbon steel construction provides adequate hardness for thread chasing and restoration on ferrous and non-ferrous fasteners
• Compact form factor suits field repair kits and service vans
• Minimum order quantity of 1 unit allows single-piece procurement

Compatibility

Designed for use on 4-40 unified coarse (4-40NC) externally threaded fasteners. Suitable as a rethread die for machine screws and threaded rods conforming to the 4-40NC thread standard.

Installation Notes

Thread restoration dies should be used by qualified tradespeople familiar with hand-threading tools and proper die alignment. Before use, ensure the fastener and die are clean and lightly lubricated with cutting oil to reduce wear and improve thread quality. Always start the die square to the fastener axis to avoid cross-threading. Follow applicable worksite safety procedures when working in energized enclosures or pressurized systems.

Technical Specifications

• Thread Size: 4-40NC
• Body Style: Hex
• Die Type: Rethread
• Material: Carbon Steel
• Weight: 1.96 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: CHD-440-I