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All in all, we spent hundreds of hours combing through thousands of user reviews to put together a comprehensive list of the best masterlock universal key on the market. We then delved into these masterlock universal key further and put together detailed reviews so that you can easily pick the best masterlock universal key for your needs.

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Best masterlock universal key reviews

1. Master Lock 5400EC Lock Box, 5 Key Capacity, Black

Feature

Large capacity key lock box enables secure storage of up to five standard (2 in.) house keys; Shackle fits most ball, biscuit, and tulip door knob styles
Set your own four-digit combination lock box; reset the combination for thousands of personalized combination code options
For indoor and outdoor use; key safe is constructed with a metal body for durability, vinyl coated shackle to prevent scratching, and shutter door to protect combination dials from weather
Exterior dimensions: 4 in. (10.2 cm) H x 3-1/4 in. (8.3 cm) W x 1-3/4 in. (4.4 cm) D; 13/32 in. (10 mm) diameter shackle with 1-13/32 in. (36 mm) L, 1-7/8 in. (48 mm) W
Capacity for 5 standard (2 in.) house keys; Interior dimensions are shaped like an ""L;"" Top section measures 0.3 in. x 1.56 in. x 2.95 in; bottom section measures 0.95 in. x 1.51 in. x 3.21 in.
Lock box combination is preset to open on 0-0-0-0. Combination reset instructions included with product.

2. Master Lock 2848DAT Key Alike Set with Receiver and Coupler Latch Locks, 2-Piece Set

Feature

LOCK APPLICATION: Best used for vehicles, trailers, and RV hitch locks
EASE OF USE: Receiver lock features convenient Push to Lock locking mechanism: push lock body firmly onto the pin and remove key
DURABLE DESIGN: Weather Tough seal and watertight cap provide protection from moisture and dirt
SPECIFICATIONS: Usable length of receiver pin is 2-3/4 in.; Stainless steel lock fits 1/2 in. and 5/8 in. receiver openings
INCLUDES: One receiver lock, one stainless steel coupler latch lock, two keys; both keys open both locks

3. Master Lock Trailer Lock, Stainless Steel Adjustable Coupler Latch Lock, 2847DAT

Feature

LOCK APPLICATION: Best used for vehicles, trailers, and RV hitch locks
EASE OF USE: Six locking positions provide maximum flexibility; Rekeyable cylinder offers keyed-alike convenience
DURABLE DESIGN: Water-tight cap protects trailer hitch lock from moisture and dirt
SPECIFICATIONS: Coupler lock adjusts from 9/16 in. to 2-3/4 in. length
INCLUDES: One trailer coupler latch lock, two keys

4. Master Lock 377KA Trailer Hitch Lock, Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer Couplers, Chrome

Feature

Trailer hitch lock fits 1-7/8 in. (48mm), 2 in. (51mm) and most 2-5/16 in. (59mm) trailer couplers
Trailer lock is best used for vehicles, trailers, and RVs
Trailer coupler lock features advanced locking mechanism to resist picking and prying
Trailer hitch lock is constructed from zinc to resist rust and corrosion
One trailer coupler lock, two keys

5. Master Lock - Universal Size Fits 1-7/8", 2", and 2-5/16" Couplers - Trailer Locks #389DAT

Feature

Universal coupler lock fits virtually all 1-7/8", 2", and 2-5/16" trailer couplers.
Bright red finish discourages thief's from messing with your trailer.
Resists rust and corrosion. Simple installation and removal.
Advanced locking mechanism resists picking and prying.
We can NOT key two (2) of these locks the same. The similar 379KA coupler locks are available keyed alike. The only difference between this one (389DAT) and the 379KA is the color.

6. Master Lock 3TRILF Outdoor Padlock with Key, 3 Pack Keyed-Alike

Feature

Indoor and outdoor lock; Best used for residential gates & fences, sheds, workshops & garages, storage lockers, tool boxes and more
Padlock with key is constructed with laminated steel body and a hardened steel shackle for strength and security
Dual ball bearing locking for maximum pry resistance; Four-pin cylinder for pick resistance
1-9/16 inch (40 millimeter) wide lock body; 9/32 inch (7 millimeter) diameter shackle with 3/4 inch (19 millimeter) length, 5/8 inch (16 millimeter) width
Three keyed alike padlocks, two keys; Both keys open each lock; Made in the USA

7. Master Lock 379ATPY Universal Trailer Hitch Lock , Black

Feature

Trailer hitch lock fits 1-7/8 in. (48mm), 2 in. (51mm) and most 2-5/16 in. (59mm) trailer couplers
Trailer lock is best used for vehicles, trailers, and RVs
Trailer coupler lock features advanced locking mechanism to resist picking and prying
Trailer hitch lock is constructed from zinc to resist rust and corrosion
Includes one trailer coupler lock, two keys

8. Kingsley Guard-a-Key Black Realtor's Lockbox

Feature

Durable All Metal Construction
Fits Over 5 Keys
10,000 Possible Combinations
More Storage Than Conventional Lockboxes
Easy to Use and Recombinate

9. Master Lock - (3 Keyed Alike Universal Trailer Coupler Locks 379KA-3

Feature

This is a set of 3 Keyed Alike trailer coupler/tongue locks and is ideal when needing multiple locks that utilize ONLY one key. The same key opens all three locks. Each lock comes with two keys, therefore you will receive a total of six keys with the purchase of this 3 pack. Limited Lifetime warranty.
These locks protects unattended trailers and guards against tow-away theft. The universal trailer coupler lock fits 1-7/8in (48mm), 2in (51mm) and most 2-5/16in (59mm) couplers by Reese, Fulton, Valley, Atwood, Shelby, Putnam, Hammerblow, Dutton, Lainson, and UFP.
This simple design is difficult to defeat because when it's locked on the trailer the lock rests on top of the coupler (see image) thus thwarting blunt force from downward hammer strikes. It also rotates (less rigidity) making it harder to break with sledge hammer force.
Rekeyable cylinder for keyed alike convenience with an advanced locking mechanism that resists picking and prying. Each lock weighs 2.4 lbs. and is simple to install and remove.
Made with Reinforced Zinc Die-Cast resists rust and corrosion. Few materials provide the strength and toughness of zinc alloys. Impact resistance is significantly higher than cast aluminium alloys, plastics, and grey cast iron. Zinc alloys offer high strengths (to 60,000 psi) and superior elongation for strong designs and formability for bending, crimping and riveting operations.

10. Master Lock Lock Box, Electronic Wall Mount Key Safe with Personal Use Software Platform, 3-1/4 in. Wide, 5441D

Feature

For indoor or outdoor use; wall mount lock box is best used for key and access card storage; large internal cavity allows secure storage for multiple keys; weather resistant to -40
Share temporary or permanent access via Bluetooth or keypad code with invited guests (Wi-Fi connection is not required to operate); Monitor activity, and receive tamper and low-battery alerts
Master Lock Vault Home app is designed for personal use, supporting up to 10 locks. Can be upgraded to Master Lock Vault Enterprise business platform for an additional fee, and integrated with Showing Time scheduling management
3-1/4 in. wide lock body; Internal dimensions 3-39/64 in. height, 2-1/2 in. width, 1-7/64 in. depth; replaceable CR123A battery (included)
For answers to frequently asked questions, troubleshooting, and technical support, see document titled User Guide in the technical specifications section of this page
1/21/20 app update: Master Lock launched Master Lock Vault Home to replace Master Lock Vault eLocks. Master Lock Vault Home features an enhanced user experience, improved functionality, and allows you to import your locks and guests from your current account

Conclusion

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