An Extension Spring is a type of mechanical spring that is used in the suspension unit of a seat frame. It is designed to be strong and resilient, ensuring that it can maintain its tension and compression properties over time. In a suspension unit, it is used to support the weight of the seat frame and absorb shock and vibration.Attributes:• Provide excellent flexibility to absorb shocks and vibrations • Provide accurate and precise suspension movement, contributing to improved stability• Direction of the coil is left hand and the total number of coils is 18 Applications:An Extension Spring is used to absorb shock and vibration, providing a smooth and comfortable ride.