MS21209F415L - Screw Threaded Insert by Helicoil Stanley Engineered Fastening

The Heli-Coil MS21209F415L is a military-standard screw-locking wire thread insert designed to generate high-strength, permanent internal threads in precision engineering applications. Formed from cold-drawn 304 stainless steelwire with a precision diamond-shaped cross-section, this tanged insert features an internal locking coil with straight, resilient chordal segments. These flat sections flex outward when a male bolt is installed, exerting a continuous, predictable prevailing torque that grips the fastener securely. This configuration delivers robust vibration resistance, preventing dangerous rotational loosening under harsh dynamic loads while protecting lightweight parent materials from thread wear, stripping, and galling.

Internal Screw-Locking Profile Deformed chordal coils apply continuous prevailing locking torque to hold mating hardware securely against severe dynamic stress.

Standard Driving Tang Engineered with an integrated driving tang on the leading coil for positive tool engagement and rapid, controlled depth placement.

Austenitic Stainless Steel Construction Crafted from work-hardened corrosion-resistant steel to create a wear-proof thread foundation that shields soft alloys from thread fatigue and stripping.

Dry Film Lubricant Coating Pre-treated with a specialized dry film lubricant to stabilize installation torque values, optimize clamping force, and eliminate friction-induced galling.