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The HELI-COIL K327-6 is a pipe thread repair kit designed to restore damaged or stripped internal pipe threads to their original specification. The kit includes 5 wire thread inserts, each with an installed length of 0.407 inches. Plumbers, pipefitters, and maintenance technicians use this kit to salvage fittings, valve bodies, manifolds, and other pipe-threaded components without replacing the entire part. The coil-type insert design redistributes load across the thread form, providing a durable, factory-spec thread once installed.
This kit is suited for repair work on pipe-threaded assemblies in residential and commercial plumbing, HVAC, and industrial piping systems. It is commonly used when a threaded port or fitting has been cross-threaded, over-torqued, or worn beyond acceptable limits. Each insert in the kit addresses one damaged thread location, making the five-piece quantity practical for service calls or shop repair work where multiple repairs may be needed.
Designed as an OEM-style thread repair solution for pipe-threaded ports and fittings in plumbing and HVAC systems where the thread form matches the K327-6 insert specification.
Installation is typically performed by a licensed plumber or pipefitter. Shut off fluid supply and relieve system pressure before beginning any thread repair on a pressurized line. The damaged port must be drilled and tapped to the correct HELI-COIL oversize before the insert is driven in; follow the tool and drill size specifications provided in the full HELI-COIL system documentation for this series. Verify thread engagement and pressure integrity after repair before returning the system to service.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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