Japanese Trunk Room / Container Lockups using Double Locks

I’ve just secured a trunk room/storage locker. I believe I need to purchase my own locks. I noticed that most everyone has two locks on their hasps. What is the purpose of this two-lock system? The only thing I can imagine is that it is meant to close up the space on one lock where a pry bar might be inserted in order to pop the lock open. Is that correct? Often one lock, is a key lock, and the other is a combination lock. Is there a reason for this? I would like to know what lock(s) I should buy to be secure. Thanks.

by LoneR33GTs

6 comments
  1. …. If only there was somewhere you could confirm the usage and requirements of the room you’re now paying a monthly fee on.

    Go to the front desk, or attendant, and ask. Different facilities have some different requirements. Or call the support number on your contract.

  2. It’s probably just for added security. This is not a question relevant to Japan so much as relevant to whatever place you made a contract with. It’s not like there is a universal standard for trunk rooms in Japan and you seem to have rented an outdoor one, which might have different rules from indoor ones.

  3. As others said this will depend on the facility. You really need to contact them or read their webpage, brochure, whatever.
    I’ve rented a storage container and the padlock was supplied by there storage company. When I canceled my contact many months later they told me to keep the lock.

  4. Some “dual lock” system allows the storage space be accessed by unlocking either one lock. This allows 2 different people access the space with their own lock/key.

    Placing a combination lock as one of the locks, will also allow the renter “grant” access to another person easily, without having to handover a key.

    If both locks need to be opened for access; then having 2 locks in general increases security by doubling the locks to be cut/picked to access the space (double the time/effort required to break in).

  5. > I would like to know what lock(s) I should buy to be secure.

    If you’re concerned about security, I would recommend searching YouTube for LockPickingLawyer, and see what he recommends (both to use, and to avoid) – and get the largest that would fit.

    That said, do also keep in mind there is little point in using a nuclear arsenal rated lock to secure a sardine can… Anyone who wants to break in, would just cut through the can (or generally, wherever is the weakest).

    Of note, if this is an outdoor facility and the lock is exposed to the elements (rain, snow, etc), you’ll want a lock that is designed for outdoor use. If not, it could seize and you may have difficulty unlocking it.

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