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Steel threaded mandrel tool 2288-5 for 5/16-18 UNC inserts

Helicoil

Helicoil Threaded Mandrel 2288-5 5/16-18 UNC

SKU CH-CZTH-TD4F8

Steel threaded mandrel for installing 5/16-18 UNC Helicoil inserts

  • Steel construction resists wear during repeated thread repairs
  • Designed for 5/16-18 UNC internal thread size
  • Compatible with both free-running and screw-locking inserts
  • General-purpose tool for automotive thread restoration

Threaded Mandrel for 5/16-18 UNC Threads

This Helicoil threaded mandrel is a steel tool designed for installing thread repair inserts. It works with both free-running and screw-locking insert types. The mandrel suits general-purpose thread repair tasks in automotive and industrial settings. Mechanics and technicians use it to restore damaged internal threads to the correct 5/16-18 UNC specification.

Practical limits of UNC thread repair

The tool is specific to the 5/16-18 UNC thread size and pitch. It cannot be used for metric threads, finer UNF pitches, or different diameter sizes. Users must match the mandrel exactly to the insert being installed. The steel construction resists wear during repeated use but requires correct alignment to avoid cross-threading the repair insert.

How it compares

Measured against everything we stock in Thread Repair & Screw Extractor Sets, at today’s prices. Recalculated every night.

Price $28.99
Cheaper than about 62% of the 18 comparable items (median $32.49).

Specifications

Product
Brand nameHELICOIL

Questions about this item

Should I choose the 5/16-18 UNC mandrel or a different thread size?

Select the 2288-5 mandrel when you are repairing or creating 5/16-18 UNC threads. Other thread sizes require their own matching mandrel.

What does the 5/16-18 UNC specification mean when I use this mandrel in my tap wrench?

It means the mandrel cuts or chases internal threads with a 5/16 inch major diameter and 18 threads per inch Unified National Coarse pitch, compatible with both free-running and screw-locking Heli-Coil inserts.

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