Milwaukee Tool 49-57-5351 Hex Rethreading Die 3/8-24 Unf

Product Description

The MILWAUKEE TOOL 49-57-5351 is a hex rethreading die designed to restore damaged or corroded external threads on bolts, studs, and fasteners. Part of the Hex-LOK series, this die is machined from carbon steel for durability under repeated use. It cuts a 3/8-24 UNF right-hand thread profile and seats in a 1.0 inch hex holder for secure, non-slip engagement during use. The fixed, non-adjustable design ensures consistent thread form on every pass. Electricians, pipefitters, mechanics, and general tradespeople keep rethreading dies on hand for field repairs where replacing a fastener is impractical.

This die is suited for restoration work on fine-pitch fasteners in automotive, mechanical, and light industrial settings. The 3/8-24 UNF specification makes it appropriate for applications where a fine thread pitch is required, such as precision assemblies or fasteners subject to vibration. At 0.5 inches thick, the die provides sufficient thread engagement for a clean, accurate chase pass. It is sold as a single die and is intended for use with a compatible 1.0 inch hex driver or die handle.

Key Features

• 3/8-24 UNF right-hand thread profile for restoring fine-pitch external threads
• Carbon steel construction for hardness and resistance to wear during thread chasing
• 1.0 inch hex size fits standard Hex-LOK and compatible hex die handles for secure drive engagement
• Fixed, non-adjustable design delivers consistent thread form without setup variation
• 0.5 inch die thickness provides adequate thread engagement depth for accurate rethreading
• Compact single-die format sized for inclusion in a field tool kit

Compatibility

Designed for use with 1.0 inch hex die handles and holders compatible with the Hex-LOK series; intended for rethreading 3/8-24 UNF right-hand external threads.

Installation Notes

Thread chasing and rethreading work is typically performed by mechanics, electricians, or maintenance tradespeople working on threaded fasteners in place. Before use, clean debris and rust from the damaged thread area. Apply cutting oil to the die and fastener to reduce heat and extend die life. Drive the die slowly with steady, even pressure to avoid cross-threading or die damage.