MS21209C0610L - Screw Threaded Insert by Helicoil Stanley Engineered Fastening

The Heli-Coil MS21209C0610L (Heli-Coil Part Number: 3585-06CN138) is a military-standard screw-locking wire thread insert engineered to establish permanent, wear-resistant internal threads in precision engineering applications. Precision-coiled from cold-drawn 304 stainless steel wire with a distinctive diamond cross-section, this tanged insert features internal locking coils with straight, resilient chordal segments. When mating male hardware is introduced, these flat segments flex outward, exerting a continuous, controlled prevailing torque that grips the fastener securely. This configuration delivers robust vibration resistance, preventing rotational loosening under severe dynamic loads while protecting lightweight host materials from internal thread stripping, fatigue, and galling. Pre-coated with a specialized dry film lubricant, it stabilizes assembly friction and optimizes clamping force dynamics.

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

Standard Driving Tang Engineered with an integrated drive 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 establish 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 finish to stabilize installation torque values, optimize clamping force, and eliminate friction-induced galling.

NASM - Products meet Military Specifications (MS) and National Aerospace Standards (NAS) requirements as applicable and are shipped with appropriate documentation.