Master Lock Chrome Puck Lock Heavy Duty Hidden Shackle - Secure Fit

In this review the Master Lock Chrome Puck Lock is evaluated as a heavy duty keyed padlock and hasp combination aimed at securing moving trucks, trailers, vans and sliding doors. The single biggest reason to buy is its hidden shackle design, which largely removes shackle exposure and improves resistance to bolt cutters while the zinc plated solid steel construction gives real corrosion resistance for indoor or outdoor use.

Key Features

• Hidden shackle: Keeps the shackle out of sight and reduces the risk of bolt cutter attacks, improving physical security for doors and gates.
• Zinc plated solid steel: The lock and 9-1/16 in hasp are built for strength and corrosion resistance, suitable for outdoor mounting on vehicles and buildings.
• Five-pin cylinder: Provides solid pick resistance so the lock resists simple manipulation and unwanted entry attempts.
• Key retaining safeguard: Ensures the padlock is not left unlocked by retaining the key when the lock is open, helping prevent accidental unsecured doors.
• Includes hardware essentials: The set ships with one padlock, two keys and a high security hasp sized for common sliding door installations.

Who It's For

This lock is best for owners of moving trucks, cargo vans, trailers or buildings with sliding doors who want a compact, robust solution to protect contents. Installers who can measure door backset, cross bore and thickness ahead of purchase will get the best fit and security from the included 9-1/16 in hasp.

Customers who need a lightweight travel padlock, electronic entry or a lock that fits unusual or very thin doors should look elsewhere, since this set is optimized for heavy duty vehicle and sliding door setups and requires appropriate carriage bolts for mounting.

Pros & Cons

Pros

• Sturdy zinc plated steel construction offers reliable corrosion resistance and strength.
• Hidden shackle design meaningfully reduces vulnerability to bolt cutters.
• Five-pin cylinder and key retaining feature increase pick resistance and prevent leaving the lock unlocked.
• Good value for a complete padlock and 9-1/16 in hasp package with two keys included.

Cons

• Requires measuring door backset, cross bore and thickness to ensure proper fit and may need specific carriage bolts for installation.
• Some users report mixed experiences with ease of locking and unlocking under certain door or hasp alignments.

Specifications

Product type	Hidden shackle padlock with hasp
Hasp length	9-1/16 in (23 cm)
Lock body diameter	2-7/8 in (73 mm)
Material	Zinc plated solid steel
Keying and cylinder	Five-pin cylinder, key retaining
Included	One padlock, one hasp, two keys
Recommended fasteners	3/8 in carriage bolts (not included)

Our Verdict

The Master Lock Chrome Puck Lock is a solid choice for securing trucks, trailers and sliding doors where a heavy duty, corrosion resistant lock is required. Its hidden shackle design and five-pin cylinder make it a practical, good value option for users who measure their door dimensions ahead of purchase and can install with proper carriage bolts.

Frequently Asked Questions

Is this lock weather resistant?
Yes, the zinc plated solid steel construction provides corrosion resistance suitable for indoor and outdoor use.

What mounting hardware is needed?
The hasp is 9-1/16 in long and the manufacturer recommends 3/8 in carriage bolts for installation; bolts are not included.

Will it fit any sliding door?
It fits many sliding doors for trucks, vans and buildings but you must measure door backset, cross bore and thickness to ensure proper fit.