Milwaukee Tool 49-57-5321 Hex Rethreading Die 8-32 Unc

Product Description

The MILWAUKEE TOOL 49-57-5321 is a hex rethreading die designed to restore damaged or corroded external threads without requiring a tap and die set handle. Part of the Hex-LOK series, this die fits 1-inch hex drivers and works on 8-32 UNC right-hand threaded fasteners. Constructed from carbon steel, it delivers the hardness needed to cut through rust, paint buildup, and thread deformation on bolts, screws, and studs. At 0.07 pounds and 0.5 inches thick, it is compact enough to carry in a service pouch. Electricians, HVAC technicians, plumbers, and general maintenance pros keep these on hand for field thread repair.

This rethreading die is suited for residential and commercial maintenance applications where restoring a fastener in place is faster than replacement. The 8-32 UNC thread size is common in electrical enclosures, panel covers, light fixtures, and equipment chassis. The Hex-LOK design means the die seats directly into a 1-inch hex socket or wrench, allowing controlled torque application without a dedicated die stock. Right-hand thread direction matches standard fastener orientation for this size class.

Key Features

• Restores damaged 8-32 UNC right-hand external threads on bolts, screws, and studs
• Hex-LOK design seats in a 1-inch hex driver or wrench — no separate die stock required
• Carbon steel construction provides hardness for cutting through rust and paint
• Non-adjustable fixed geometry maintains consistent thread form on each pass
• 0.5-inch thickness keeps the tool compact for toolbox and pouch storage

Compatibility

Designed for use with 8-32 UNC right-hand threaded fasteners. The 1-inch hex shank is compatible with 1-inch hex sockets, box wrenches, and Hex-LOK series die holders.

Installation Notes

Thread repair dies are typically used by licensed electricians, HVAC technicians, and plumbers during equipment maintenance or installation. De-energize and lock out any equipment before working on fasteners in or near electrical panels or live systems. Apply a suitable cutting oil to the die and fastener before use to reduce friction and improve thread quality. Run the die slowly and back off periodically to clear debris and prevent binding.