MS21209C0215LSF - Screw Threaded Insert by Helicoil Stanley Engineered Fastening

The HELI-COIL MS21209C0215LSF is a military-standard screw-locking tangless wire thread insert engineered to form high-strength, vibration-resistant internal threads in soft metal parent materials. Manufactured from 302/304 stainless steel, this #2-56 UNC thread insert features a 1.5D nominal length, a specialized dry film lubricant coating, and an exclusive locking coil configuration that grips the mating fastener to prevent accidental loosening under extreme vibration, impact, or thermal cycling.

Screw-Locking Mechanism utilizes a resilient series of chords on the center coils to exert strong radial pressure on the mating bolt, effectively preventing vibration loosening.

Tangless Design eliminates the need for drive tang break-off and retrieval, streamlining installation while completely removing the risk of loose metal debris in sensitive assemblies.

302/304 Stainless Steel provides outstanding corrosion resistance and structural integrity across harsh operating and environmental conditions.

Dry Film Lubricant Coating reduces torque friction, prevents galling, and ensures smooth, consistent insertion and fastener seating.

Mil-Spec Compliance meets stringent MS21209 military specifications to ensure precise tolerances, reliability, and standardized performance in aerospace and defense applications.