Jergens 215-065969 Keylocking Thread Insert M12x1.75 M18x1.5

Product Description

The JERGENS 215-065969 is a heavy-duty keylocking threaded insert designed to provide a permanent, high-strength internal thread in metal assemblies. It features an M12 x 1.75 internal thread and an M18 x 1.5 external thread, with an overall length of 18 mm (approximately 0.709 inches). Manufactured from carbon steel, this insert is driven into a pre-tapped host bore and locked in place with keys that embed into the parent material, preventing rotation or pullout under load. It is installed by machinists, tool-and-die technicians, and maintenance professionals working on metric fastener applications.

This insert is suited for production and repair applications where a metric coarse internal thread must be established or restored in a parent material. The keylocking design is particularly useful in high-vibration or high-load environments where standard thread repair inserts may not provide adequate retention. Typical applications include machinery frames, tooling fixtures, and structural assemblies requiring a reliable M12 threaded connection within a larger M18 tapped hole.

Key Features

• M12 x 1.75 internal thread accepts standard metric coarse fasteners
• M18 x 1.5 external thread installs into a matching tapped host bore
• 18 mm overall length for adequate thread engagement depth
• Keylocking design mechanically locks insert against rotation and axial pullout
• Carbon steel construction for durability in ferrous and non-ferrous host materials
• Heavy-duty series rated for high-load and high-vibration service conditions

Compatibility

Designed as an OEM-style replacement or production-use keylocking threaded insert for metric thread repair and reinforcement applications requiring an M12 x 1.75 internal thread within an M18 x 1.5 tapped bore.

Installation Notes

Installation requires a properly tapped M18 x 1.5 host bore prepared to the manufacturer's specified depth. A dedicated keylocking insert installation tool is used to drive the locking keys into the parent material after the insert is threaded into place. Power down and de-energize any equipment before performing thread repair on machine components. Follow applicable shop safety procedures and consult the insert manufacturer's installation guidelines for correct key-driving technique.