RKE provides high-quality optical inspection machines for inspection of screws, washers, bolts and other fasteners. The inspection accuracy reaches up to 500-1200 pcs/min with accuracy up to ±0.02mm. For fasteners, we can inspect the following items: height, outer diameter, thickness, thread minor diameter, thread major diameter, with or without internal thread, thread angle, thread length, with or without washers, metal plating quality, etc.