Screw stainless steel. Ball stainless steel, POM or ceramic Si3N4.
Ball-end thrust screws with full ball are used when a clean, polished contact surface is required. Longer versions have been designed especially to be glued in, allowing mechanical connecting elements with external threads to be made cost-effectively for small and medium-sized runs. Silicon nitride (Si3N4) is characterised by a combination of excellent properties, these include high resilience and strength, excellent wear resistance and good chemical resistance.