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Internet #203544794

Model #NES21

5/16 in. - 7/16 in. Internal Universal Thread Repair Tool

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Product Overview

The NES Internal Thread Repair system is an easy way to repair internal threads that are stripped or damaged. NES internal thread repair tools are time saving, convenient and the products are universal. The NES 21 comes with a 60° blade made from hardened steel. Ideal for plumbing, construction, agriculture, car repair and many other applications where there are components with a damaged thread.
  • Operating capacity: 5/16 in. to 7/16 in.
  • 1 NES 21 external tool restores inch or metric, right hand or left hand fastener threads
  • Self-adjusting to any pitch and size within range
  • No need for calibration or identifying fastener thread type
  • Automatically chases good thread sections to repair the damaged parts



Product Depth (in.)
Product Height (in.)
Product Width (in.)


Hand Tool Type
Measurement Standard
Thread spacing
Tools Product Type
Hand Tool

Warranty / Certifications

Manufacturer Warranty
Tools returned broken (in two or more pieces) which are devoid of any signs of abuse or mistreatment would normally be replaced at factory expense. Any other tools subject to warranty claim are likely to be excessively worn or abused and no refund or replacement commitment may be authorized prior to factory inspection and approval.

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Customer Reviews

  • 5
    out of 1 reviews
  • 100% recommend this product
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This is about the only tool I can find in existence that performs this specific type of repair. I...
This is about the only tool I can find in existence that performs this specific type of repair. It opened up a small cross threaded section in a bolt hole on my aluminum engine block from inside-out. Thus, saving me from having to pull the engine to use Helicoil or alternatively have to replace the block. Worth the big price tag. I couldn't find any other tool that starts deep on the "Good" threads; reusing them to back its way out. The only tool that comes close to this is a spark plug backtap, but those sizes are very specific. If you need to repair damaged threads in this manner this tool does do the job. The included nylon cover worked great when using the tool on aluminum.
by RyGuy
Showing 1-1 of 1 reviews