Master Lock Hidden Shackle Lock with Hasp - Silver
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Product Information
Full details
The Master Lock Hidden Shackle Lock with Hasp is an ideal security solution for individuals needing to protect moving trucks, storage vans, or buildings with sliding doors from unauthorized access. Its core benefit is the hidden shackle design which renders standard bolt cutters useless, providing a formidable barrier against forced entry. While it offers industry-leading durability, users should note that the specialized hidden design requires a matching hasp installation, meaning it is not a direct replacement for standard exposed-shackle padlocks on existing hardware.
All features
| Colour | Silver |
|---|---|
| Model Part Number | M736XKADCCSEN |
| Brand | Master Lock |
Extended Product Information
FAQs
Can I use this lock with my existing hasp?
No, this lock is designed to work specifically with the included 9-1/16 inch high-security hasp.
Does this lock come with replacement keys?
The package includes two keys. It is recommended to store one in a secure, separate location.
Is this lock waterproof?
It is corrosion-resistant, making it suitable for outdoor use, but it is not hermetically sealed.
What size bolts should I use for installation?
The manufacturer recommends using 3/8 inch carriage bolts for the best fit and security.
Can the hidden shackle still be cut by a grinder?
While the design makes bolt cutters ineffective, any high-security lock can be defeated by power tools given enough time and noise; however, this design significantly increases the difficulty and time required for such an attack.
Why can't I remove the key while the lock is open?
This is a safety feature called 'key retaining,' designed to prevent users from accidentally leaving the lock unsecured.
Troubleshooting
Key does not turn smoothly in the cylinder
Ensure the key is fully inserted and the cylinder is free of debris. Use a dry silicone lubricant spray.
The hasp does not sit flush against the door
Verify that your mounting surface is flat. If necessary, use a shim or backing plate to create a level mounting area.
Cannot remove the key from the lock
The lock has a key-retaining feature. The key can only be removed when the padlock is in the fully locked position.
Pros and Cons
Pros
- Maximum resistance to bolt cutters due to shielded shackle
- Durable zinc-plated steel construction
- Pick-resistant five-pin cylinder
- Key retaining safety mechanism
- Versatile for both indoor and outdoor use
Cons
- Not compatible with standard padlocks or existing hasps
- Requires professional or precise installation of the included hasp
- Can be bulky for smaller storage units
- Key is required to lock the unit
Setup, Compatibility & Care
Installation requires 3/8 inch carriage bolts to ensure the hasp is anchored securely to the surface. It is recommended to use through-bolts with backing plates if mounting on thin-walled metal doors to prevent the hasp from being ripped off. For care, although the lock is corrosion-resistant, applying a small amount of dry lubricant to the cylinder once or twice a year will keep the locking mechanism operating smoothly. Avoid using oil-based lubricants, as they can attract dust and debris that may lead to jamming.