1191-3EN190 - Screw Threaded Insert by Helicoil Stanley Engineered Fastening

The Heli-Coil 1191-3EN190 by Stanley Engineered Fastening is a high-strength tanged free-running insert designed to create durable, wear-resistant internal threads in soft parent materials. Cold-rolled from premium 304 stainless steel wire with a precision diamond-shaped cross-section, this wire thread insert compensates for pitch and angle errors to optimize joint load distribution. When wound into a tapped hole, it expands outward with a spring-like retention force, eliminating the need for interference fits, keying, or swaging. This particular insert features a specialized Primer-Free II coating, which completely replaces traditional zinc chromate primers to protect assemblies against galvanic corrosion between dissimilar metals while ensuring clean, high-efficiency assembly operations.

Key Features Primer-Free II Coating Eliminates the multi-step application of wet primers, preventing galvanic corrosion between dissimilar metals while maintaining clean manufacturing environments.

Free-Running Profile Provides a smooth, standard internal thread path that allows male fasteners to rotate freely without locking or friction resistance.

Tanged Configuration Utilizes a traditional driven mandrel installation tang that provides positive mechanical engagement and controlled depth during insertion.

Resilient Wire Design Distributes stresses evenly across the tapped parent material to shield assemblies from thread stripping, wear, and structural erosion.