Grade 8 bolts are used for: Flywheels Water pumps Door panels Manifolds

Grade 8 bolts are in applications where high strength and durability are required. Among the options provided:<br /><br />- **Flywheels**: These are heavy-duty components that require strong fasteners to ensure they remain securely attached. Grade 8 bolts are suitable for this purpose due to their high strength.<br /><br />- **Water pumps**: These are generally not as heavy-duty as flywheels, but they still require strong fasteners to ensure they function properly under pressure. Grade 8 bolts can be used here as well.<br /><br />- **Door panels**: These are generally not as heavy-duty as flywheels or water pumps. Grade 8 bolts are not typically required for door panels unless the door panels are part of a heavy-duty structure.<br /><br />- **Manifolds**: These are used in various applications, including automotive and industrial settings. Depending on the application, Grade 8 bolts may be required to ensure the manifold can handle high pressure and stress.<br /><br />Given these considerations, the most appropriate use for Grade 8 bolts among the options provided is:<br /><br />**Flywheels**<br /><br />Grade 8 bolts are ideal for flywheels due to their and durability, ensuring that the flywheel remains securely attached and functions properly under heavy loads.