Damage from Extra Nut on Top Nut

A slackened nut may cause noise, failure of the shock absorber, or in the worst case even damage to the vehicle. For this reason, please tighten the top nut with a torque wrench at the prescribed torque. Also periodically check and tighten the nut.

Please refrain from securing the top nut with another nut (Photo 1). If an extra nut is tightened while holding the top nut (Photo 2), too much pressure can cause the piston rod to twist or stretch between them. Especially in damping force adjustable shock absorbers, since housing the adjustment mechanism, their piston rod has a thinner cylinder wall than non-adjustable ones. If the piston rod stretches, the adjustment mechanism can break. In the worst case, the top of the piston can come off, and it will have to be replaced. Even within the warranty period, servicing cost for that must be covered by the owner.

Please refrain from securing the top nut with another nut (Photo 1). If an extra nut is tightened while holding the top nut (Photo 2), too much pressure can cause the piston rod to twist or stretch between them. Especially in damping force adjustable shock absorbers, since housing the adjustment mechanism, their piston rod has a thinner cylinder wall than non-adjustable ones. If the piston rod stretches, the adjustment mechanism can break. In the worst case, the top of the piston can come off, and it will have to be replaced. Even within the warranty period, servicing cost for that must be covered by the owner.

To avoid this kind of problem, you should use only the top nut included in the product, and tighten it at the appropriate torque. Please periodically check and tighten the top nut. Never add an extra nut.