Heli-Coil Thread Repair Kits
- Sometimes threads are stripped or cross-threaded, especially the ones for the mounting flange bolts (5/6-18). Heli-Coil Thread Repair kits are available for this size at some hardware stores and most machine tool stores. The kit inserts are precision coils of stainless steel, diamond-shaped wire. The kit has a toll called a tang for installation, which is notched for easy removal. The insert is larger than the tapped hole before installation. During installation, the insert is compressed so it will enter the tapped hole. After installation, each coil expands outward to permanently anchor the insert. Since the insert is made of wire, it automatically adjusts itself to any expansion or contraction of casting.