MS21209F120L - Screw Threaded Insert by Helicoil Stanley Engineered Fastening

The Heli-Coil MS21209F120L by Stanley Engineered Fastening is a military-specification tanged screw-locking insert engineered to establish permanent, high-strength internal threads in low-density parent metals such as aluminum and magnesium alloys. Precision cold-rolled from high-grade 304 stainless steel wire with a uniform diamond-shaped cross-section, this wire thread insert automatically adapts to pitch and angle variances for optimized joint load distribution. Its advanced screw-locking configuration incorporates a series of straight chord segments on the internal coils that exert a resilient self-locking torque on the male fastener, effectively resisting rotational back-out caused by extreme shock and vibration without requiring lock-washers or auxiliary locking devices.

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.

Military Specification Certified Manufactured to stringent aerospace and military standards, guaranteeing consistent performance and dimensional accuracy in mission-critical hardware assemblies.

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.

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