Moulding Inserts Explained: Types, Materials & Uses

Moulding inserts allow plastic, rubber and elastomer components to gain durable threads, mounting points, sleeves and other functional features that the base material alone cannot provide. This guide explains how insert moulding works, from insert design and placement to material introduction and inspection. It covers key insert types—threaded, knurled, bushes and custom-shaped—along with material options like brass, steel and stainless steel, helping engineers select the right moulding insert for automotive, HVAC, electrical and industrial applications.