Inserts are used in structural assemblies, such as forgings, castings and machined components where a tapped hole will not provide an adequate thread shear area, nor a self-locking device and could jeopardize the integrity of the component in case of thread damage. In aluminum components for example, an insert provides a stronger material for the bolt to engage with; as such, they are commonly used in engine cases and gearboxes. Inserts are also available for honeycomb panels and even the new composite materials for airframe applications.
Once installed, inserts are expected to play the role of a standard nut with the difference that they’re not reachable or even visible at the time of installation. An insert must therefore ensure similar self-locking features as a nut but it must also provide an anti-rotation device in the structure into which it is inserted.
Twenty years ago LISI AEROSPACE developed a product line dedicated to a specific insert configuration: the key “locked-in” inserts. Their structural performances and ease of installation make them the number one product for highly loaded assemblies. Our inserts come with a self-broaching option that allows assemblies in Inconel®, titanium, stainless steel or aluminum structures. The product range covers all possible diameters, in both imperial and metric, and is adapted to all national and international standards. It can be made out of the standard variety of aerospace materials, including corrosion and heat-resistant steels, Inconel®. Since inserts are commonly used to repair damaged threads, LISI AEROSPACE includes all oversized diameters.
Since inserts are commonly used to repair threads when damaged, LISI AEROSPACE product line includes all oversizes diameters.
INCONEL is a trademark of Special Metal Corporation.