Jergens 215-066365 Keylocking Thread Insert M6x1 M12x1.25

Product Description

The JERGENS 215-066365 is a heavy-duty keylocking thread insert designed to install a permanent, high-strength internal thread into a host material. The insert features an M6x1 internal thread and an M12x1.25 external thread, with an overall length of 12 mm (approximately 0.472 inches). Constructed from 303 stainless steel with a passivated finish, it resists corrosion and handles demanding service environments. The keylocking design uses drive keys that anchor the insert mechanically into the parent material, preventing rotation and pullout under load. Licensed tradespeople and precision assembly technicians install this type of insert where thread repair, thread reinforcement, or material thread-strength upgrade is required.

This insert is suited for metric coarse thread applications in metalworking, machine assembly, tooling, and industrial maintenance. The M6x1 internal thread accepts standard M6 fasteners, while the M12x1.25 external thread determines the required tapped hole size in the host material. It is appropriate for use in steel, aluminum, cast iron, and other machinable substrates where a durable, locked-in thread is needed. The passivated 303 stainless steel construction makes it suitable for environments where mild corrosion resistance is a requirement alongside mechanical performance.

Key Features

• Heavy-duty keylocking design anchors mechanically into host material to resist rotation and axial pullout
• M6x1 internal thread with 6H class of fit for precise fastener engagement
• M12x1.25 external thread with 6G class of fit for accurate installation into tapped host bore
• 303 stainless steel construction with passivated finish for corrosion resistance
• 12 mm overall length suits standard thread engagement depth requirements
• Metric coarse thread standard for broad compatibility with metric fastener systems

Compatibility

Designed as an OEM-style keylocking thread insert for metric coarse applications requiring an M6x1 internal thread installed via an M12x1.25 tapped host hole.

Installation Notes

Installation is performed by a machinist or maintenance technician using the appropriate keylocking insert installation tool set. The host material must be tapped to M12x1.25 before the insert is driven in; ensure the tapped hole depth accommodates the 12 mm insert length. Drive keys are staked into the host material after insert seating to lock the insert against rotation. De-energize or lock out any associated equipment before performing thread repair or insert installation work in the field.