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Thread repair kit with drill bit, tap, tool and 12 stainless steel inserts

Helicoil

Helicoil 5407-2 Thread Repair Kit 1/8-27 NPT 12 Pcs 304 SS

SKU CH-SA36-62WGH

Repairs 1/8-27 NPT threads with 12 stainless steel inserts, drill bit, tap and installation tool included

  • 304 stainless steel inserts resist corrosion in metal applications
  • Kit includes 12 inserts for multiple thread repairs
  • Supplied drill bit and tap prepare holes accurately
  • Installation tool enables quick fitting of free-running inserts
  • 1/8-27 NPT size restores damaged pipe threads

12-piece NPT thread repair kit

The Helicoil 5407-2 kit provides a complete solution for restoring damaged 1/8-27 NPT threads in metal components. It contains twelve 304 stainless steel inserts, a matching high-speed steel tap, a 3/8 inch drill bit and the dedicated installation tool. Everything needed for the repair is supplied in a single package.

Free-running 304 stainless inserts

The inserts are manufactured from 304 stainless steel with a free-running profile that installs without locking compound. Their 0.273 inch length matches the nominal thread depth, allowing the tap to prepare the hole and the tool to seat each insert flush. The material resists corrosion in automotive fluid environments.

Verify thread pitch and material compatibility

Confirm the damaged hole uses 1/8-27 NPT specification before ordering; other pitches or straight-thread standards will not accept these inserts. The kit is designed for metal workpieces only and is not suitable for plastic or soft alloy repairs. Ensure a 3/8 inch drill can access the hole location.

Highlights

  • 304 stainless steel inserts resist corrosion in metal applications
  • Kit includes 12 inserts for multiple thread repairs
  • Supplied drill bit and tap prepare holes accurately
  • Installation tool enables quick fitting of free-running inserts
  • 1/8-27 NPT size restores damaged pipe threads

Specifications

BrandHELI-COIL

Questions about this item

Will the 304 stainless inserts need periodic replacement in a steel manifold?

The 304 stainless inserts resist corrosion and galling in steel, so they typically remain in place for the life of the repair unless the joint is repeatedly disassembled.

What wears first when the tap cuts new 1/8-27 NPT threads all day?

The high-speed steel tap dulls before the drill or installation tool, so plan on resharpening or replacing it after heavy production use.

How hot does the drill bit get when installing all 12 inserts back-to-back?

The 3/8 high-speed steel drill runs warm but stays within normal hand-tool temperatures; pausing between holes keeps it comfortable for continuous work.

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