Value Collection 365-4325 Hex Rethreading Die 4-1/2-12

Product Description

The VALUE COLLECTION 365-4325 is a hex rethreading die designed to restore damaged or corroded external threads on large-diameter fasteners and fittings. Machined from carbon steel, this die cuts a 4-1/2-12 thread form to the UNS standard with a right-hand thread direction. The 7-inch hex body seats firmly in a matching wrench or holder, giving the technician the torque control needed to chase threads cleanly without removing the workpiece from service. Machinists, pipefitters, and maintenance mechanics reach for rethreading dies when bolt and stud threads are too damaged to accept a nut or coupling but the component itself is still serviceable.

This die is suited for heavy industrial and maintenance applications where large-diameter UNS threads appear on structural fasteners, pipe flanges, hydraulic fittings, and heavy equipment tie rods. The 4-1/2-12 thread specification indicates a nominal diameter of 4.5 inches with 12 threads per inch, a coarse pitch common in large-scale mechanical assemblies. It is a practical choice for shops and field crews performing in-place thread restoration on equipment that cannot be easily disassembled.

Key Features

• 4-1/2-12 UNS right-hand thread form for large-diameter external thread restoration
• 7-inch hex body provides positive engagement with standard hex-drive holders and wrenches
• Carbon steel construction offers the hardness needed to chase steel and iron fastener threads
• Right-hand thread direction matches the standard orientation of the vast majority of industrial fasteners
• UNS thread standard ensures dimensional conformance with unified national screw thread specifications

Compatibility

Designed for use on external threads with a 4-1/2-12 UNS right-hand thread profile. Requires a hex die holder or wrench sized for a 7-inch hex drive.

Installation Notes

Rethreading dies are typically used by machinists, millwrights, and pipefitters performing maintenance or repair work. Before chasing threads, clean the fastener or stud with a wire brush and apply an appropriate cutting fluid to reduce die wear and improve thread quality. Work the die slowly onto the damaged thread, backing it off periodically to clear chips. Always inspect the restored thread with a matching nut or gauge before returning the fastener to service.