Brass Knurling Insert, Diameter: 5 mm

A brass knurling insert is a threaded metal fastener with a textured or ribbed outer surface. It is used to provide a durable, reusable, and strong threaded connection in softer materials like plastics, composites, and wood, where the material itself would not hold a reliable thread. The knurled pattern grips the softer host material, preventing the insert from pulling out or spinning.