Product Description
The Heli-Coil® 1191-4CN250 is a free-running, tanged wire thread insert precision-formed from 304 stainless steel. Designed to create strong, permanent 1/4-28 UNF fine threads in soft parent materials like aluminum, magnesium, and engineered plastics, this insert provides exceptional wear resistance and corrosion protection. Its resilient helical coil design evenly distributes fastener clamping forces along the full length of thread engagement, safeguarding assemblies against thread stripping, galling, and stress failure.
304 Stainless Steel Construction delivers high tensile strength and superior corrosion resistance for dependable, long-term joint integrity.
Free-Running Wire Design allows standard male fasteners to travel smoothly through the insert without friction locking.
Integrated Drive Tang ensures fast, uniform installation into standard tapped holes using tanged insertion tools.
1/4-28 UNF Fine Threading reinforces lightweight metal components or repairs damaged fine internal threads.
1D Nominal Length Ratio optimizes thread engagement depth to provide high pull-out strength in compact joint spaces.
Product Specs
- SKU:
- 1191-4CN250
- Thread Size (Inch):
- 1/4-28
- Thread:
- UNF
- Overall Insert Length (Decimal Inch):
- 0.250
- Tang:
- Tanged
- Material:
- 304 Stainless Steel
- Number of Free Coils:
- 5
- Length to Diameter Ratio:
- 1:1
