3591-6CN375 - Helicoil ® Threaded Insert by Stanley ® Engineered Fastening

The Heli-Coil 3591-6CN375 by Stanley Engineered Fastening is a high-performance tanged screw-locking insert engineered to form high-strength, permanent internal threads in lightweight parent materials such as aluminum, magnesium, and zinc die-castings. Precision cold-rolled from high-grade 304 stainless steel wire with a uniform diamond-shaped cross-section, this wire thread insert adapts to pitch and thread angle variances to optimize joint load distribution. Its advanced screw-locking configuration incorporates a series of specialized straight chord segments on the internal coils that exert a resilient, self-locking torque on the mating fastener, preventing rotational loosening under severe shock and vibration without requiring lock-washers or auxiliary locking hardware.

Screw-Locking Mechanism Grips the male bolt or screw with a series of specialized straight segments on the internal coils, ensuring a secure, vibration-proof joint without requiring lock-washers or auxiliary locking devices.

Tanged Configuration Features a traditional driven installation tang that provides positive mechanical engagement with standard mandrels for controlled and highly accurate depth seating into tapped holes.

High Structural Integrity Compensates for pitch and angle variances within tapped parent metals, dispersing concentrated joint loads evenly to elevate overall assembly fatigue life.

Resilient Wire Construction Utilizes a continuous helically wound diamond profile that handles thermal expansion and contraction elastically while safeguarding against thread stripping and wear.