A spring and small flat washer are embedded in the screw with a shape that prevents them from falling off. This product uses SCM hex bolts and 40–50 HRC spring washers. These washer insert sizes are designed to prevent forgotten washer insertion and decrease time and effort.The primary purpose of spring washers is to provide tension and preload in a joint assembly. This helps to maintain clamping force and prevent loosening or loss of tension due to vibration, thermal cycling, or other factors.
