Master Lock 178D Combination Lock - Black
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Product Information
Full details
The Master Lock 178D is designed for individuals seeking a reliable, keyless security solution for indoor and outdoor applications such as school lockers, gym lockers, and residential gates. Its standout benefit is the user-settable four-digit combination, which eliminates the need to carry physical keys; however, users must be diligent in remembering their chosen code, as forgetting it may prevent access to the lock.
All features
| Colour | Black |
|---|---|
| Model Part Number | 178D |
| Brand | Master Lock |
Extended Product Information
FAQs
What is the factory default combination?
The Master Lock 178D is preset to 0-0-0-0.
Can I use this lock outside?
Yes, the 178D is designed with weatherability in mind, making it suitable for both indoor and outdoor environments.
What should I do if I forget my combination?
For security reasons, the combination cannot be reset without the current code. Keep a secure record of your combination in a safe location.
Does this lock come with a spare key?
No, this is a combination-only lock and does not include any keys.
What is the diameter of the shackle?
The shackle has a diameter of 5/16 inches (8 millimeters).
Troubleshooting
The lock will not open with the current code.
Verify the code is aligned perfectly with the indicator line and try again. If you have forgotten the code, professional locksmith assistance may be required.
The combination change tool will not turn.
Ensure the lock is currently set to the correct existing combination before attempting to use the change tool.
The shackle feels stiff or difficult to open.
Clean any debris from the shackle hole and apply a small amount of non-greasy lubricant to the shackle stem.
Pros and Cons
Pros
- No keys to lose or carry
- Highly durable solid body construction
- Resettable combination for security updates
- Suitable for both indoor and outdoor use
- Superior cut resistance via hardened steel
Cons
- Risk of being locked out if the combination is forgotten
- Requires manual tool to change the code
- Fixed shackle length may not fit all types of oversized latches
Setup, Compatibility & Care
To set your own combination, insert the included combination change tool into the hole on the bottom or side of the lock, rotate it as instructed, and set your new sequence. Always test your new combination while the shackle is open before closing the lock to ensure it works correctly. This lock is compatible with most standard locker hasps and gate eyelets. To maintain performance, occasionally wipe the lock body with a clean, dry cloth to remove dirt or debris. If the lock is used in harsh, freezing conditions, consider applying a silicone-based lubricant to the internal mechanism to prevent sticking.