Brass threaded inserts are widely used in molded plastic parts because they provide a durable thread without forcing the plastic boss to carry repeated screw load by itself. The most common sourcing problems come from unclear knurl design, wrong insertion method or missing tolerance around the pilot hole.
Before placing an RFQ, engineers should confirm whether the insert will be heat-set, ultrasonic inserted, press-fit or molded in. Each process needs a different outside profile. Knurl direction, flange height, thread depth and lead-in chamfer should match the assembly process rather than follow a generic catalog shape.
For small plastic housings, burr control and thread cleanliness are also important. A low-cost insert that damages the plastic during installation can create higher cost later in rework or field failure. Sharing plastic material, hole size and pull-out requirement helps the supplier recommend a more stable insert design.