Keyed Locking Thread Inserts (Keensert-Type)
The keyed insert is a precision-machined stainless steel bushing with internal and external threads. After the insert is screwed into an oversize tapped hole, the four keys are staked downward into a recess cut in the parent material, mechanically locking the insert in place. The lock does not rely on friction or thread adhesive, so it is unaffected by temperature, oil or vibration history.
Compared with wire thread inserts, the solid-wall design adds wall thickness and strength, making it the preferred repair and reinforcement method for stripped holes in aluminum castings, magnesium housings and other soft alloys — and a standard choice in aerospace-style applications where positive retention is specified.
Applied in engine castings and gearbox housings, aerospace and low-altitude aircraft structures, industrial electronics chassis, and any aluminum or magnesium component where tapped threads must survive repeated assembly and high service temperatures.
