Double-end knurling provides two engagement zones within the plastic, which can improve torque resistance compared with a single knurled band. It is often used where the insert is subjected to both rotational and axial loads.

The insert can be installed by heat staking, ultrasonic insertion, or press-fit, depending on the plastic type and wall thickness. Heat staking is commonly used for thermoplastics because the melted plastic flows into the knurl and resets around it.

The outer diameter should match the molded hole size recommended for the specific plastic and installation method. A hole that is too small may crack the boss; a hole that is too large may reduce pull-out resistance.

Yes. Non-standard threads, including different metric sizes and pitches, can be produced on request.

Cleaning removes machining oils, chips, and surface contamination. This supports consistent insertion behavior and reduces the risk of contamination in the final assembly.

Brass provides moderate corrosion resistance, but outdoor or high-humidity environments may require additional surface treatment or material selection. Please confirm the operating conditions with us.

Please provide outer diameter, total length, thread size, knurl type, material, surface treatment, quantity, and any drawing or tolerance requirements.