Inserts

Inserts are components added to another object to provide new functionality, reinforcement, or repair. The term is used across diverse fields such as engineering, manufacturing, and publishing, and the specific form and purpose of an insert vary by application.

In mechanical engineering, threaded inserts are common for supplying durable threads in softer base materials like plastics or weaker metals. They are installed by pressing, heating (to melt or soften the surrounding material), or self-tapping into place. Self-clinching inserts are used in thin sheet metal to create strong threaded holes without protrusion. Other variants include bearing or bushing inserts that relocate or support wear surfaces. Inserts can also serve as sleeves or adapters to accommodate different fastener sizes.

In plastics manufacturing, insert molding embeds metal or other inserts into a plastic part during the molding process, creating a single, integrated component. Heat-set inserts are heated and pressed into thermoplastics to form secure, heat-stable threads. The choice of insert type depends on factors such as load, temperature, chemical exposure, and manufacturing method.

In publishing and media, an insert refers to a separate page or booklet placed inside a publication, often used for advertisements, catalogs, or special content.

Materials for inserts vary from metals such as steel, brass, and stainless steel to polymers and composite materials, chosen for strength, corrosion resistance, and compatibility with the host part. Selection considerations include load requirements, material compatibility, installation technique, and cost.