Heli-coil A1191-3CN285 10-32 Free Running Insert 0.285in Ss

Product Description

The HELI-COIL A1191-3CN285 is a free running helical wire thread insert designed to restore or reinforce 10-32 UNF threads in tapped holes. Manufactured from 304 stainless steel with a bright, uncoated finish, this insert provides a durable, corrosion-resistant internal thread form in softer base materials such as aluminum, magnesium, or plastics. It measures 0.285 inches in overall length at a 1-1/2D length-to-diameter ratio, with 6-7/8 free coils. The tanged drive style allows installation with a standard Heli-Coil insertion tool. Installation is performed by mechanical, electrical, or maintenance technicians wherever thread repair or reinforcement is required.

This insert is suited for thread repair and new production applications across industrial, aerospace, automotive, and general mechanical assembly. It fits any tapped hole prepared to the correct Heli-Coil specification for 10-32 UNF thread. Typical use cases include repairing stripped threads in cast housings, control panels, engine components, and equipment enclosures where maintaining original bolt engagement strength is critical. This listing covers a single insert; minimum order quantity is 10 units.

Key Features

• 10-32 UNF thread size for standard unified fine-pitch fastener compatibility
• 304 stainless steel construction for corrosion resistance in demanding environments
• Bright, uncoated finish suitable for a wide range of base materials
• Tanged design compatible with standard Heli-Coil insertion tools
• 1-1/2D length-to-diameter ratio provides solid thread engagement in shallow bores
• 6-7/8 free coils for consistent thread form and load distribution

Compatibility

Designed as an OEM-style free running thread insert for any 10-32 UNF tapped hole prepared to standard Heli-Coil drill and tap specifications.

Installation Notes

Installation requires a correctly sized Heli-Coil tap and insertion tool matched to the 10-32 thread specification. Ensure the host material is fully de-energized and secured before drilling or tapping operations begin. After insertion, break off the drive tang using a tang break-off tool; retain and remove the tang from blind holes before reassembly. Follow applicable torque specifications for the fastener being threaded into the installed insert.