MS21209C0210L - Screw Threaded Insert by Helicoil Stanley Engineered Fastening

The Heli-Coil MS21209C0210L (Heli-Coil Part Number: 3585-02CN086) is a military-standard screw-locking wire thread insert engineered to establish high-strength, permanent internal threads in precision engineering and aerospace applications. Precision-coiled from cold-drawn 304 stainless steel wire with a specialized diamond-shaped profile, this tanged insert features internal locking coils with straight chordal segments. When mating male hardware is installed,these flat segments flex outward, exerting a consistent prevailing torque that grips the fastener securely. This provides exceptional vibration resistance, preventing rotational backing-out under extreme dynamic shock while protecting delicate, soft parent materials from internal thread stripping, fatigue, and wear. Pre-coated with a specialized dry film lubricant, it stabilizes installation friction and ensures uniform clamping dynamics.

Internal Screw-Locking Profile Deformed chordal coils apply continuous prevailing locking torque to keep mating hardware firmly locked against severe operational shock and vibration.

Standard Driving Tang Engineered with an integrated drive tang on the leading coil for positive tool engagement and precise placement depth control.

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

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