10 Best Trailer Tongue Lock of December 2025

• Universal coupler lock fits virtually all 1-7/8", 2", and 2-5/16" trailer couplers.
• This lock protects unattended trailers and guards against tow-away theft. The bright red finish discourages thiefs 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.

Master Lock

• 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

Master Lock

• 🔒【UNIVERSAL FIT】 Ratchet design is adjustable with 11 locking positions and fits 1-7/8”, 2”, and 2-5/16” couplers.
• 🔐【HIGHLY VISIBLE】Use of a bright, deterrent yellow color offers durable, highly visible protection for trailers.
• 🛡【DEPENDABLE SECURITY】To protect your trailer from theft, this trailer lock is made with an aluminum body and high-strength steel construction, strong cut and shear resistance.
• ✅【WATERTIGHT & RESISTS RUST AND CORROSION】The internal components of this hitch lock can easily be protected from the elements with the included watertight dust cap, while the entire hitch lock is shielded against corrosion with a durable powder coat finish.
• 🔑【3 KEYS INCLUDED】For your convenience, 3 keys are included with this trailer hitch lock. You can keep the spare keys in a discrete location for emergencies or give it to a friend for helpful access. ⭐【Quality Service】If you have any problems or questions, please don't hesitate to contact us via message. We will reply and give you the best solution within 24 hours.

Turnart

• DEPENDABLE SECURITY. To help protect your trailer from theft, this trailer lock fits over the trailer tongue and is designed to prevent a trailer ball from being inserted into the trailer coupler
• EASY TO OPERATE. This trailer tongue lock has a sleek, subtle look to deter theft, and uses a simple 1/4-turn lock activation for convenient locking and unlocking as needed
• VERSATILE. With a standardized channel, this trailer coupler lock fits most 2-5/16-inch and some 2-inch flat and rolled-lip trailer couplers (check dimensions)
• WEATHER-RESISTANT. This trailer tongue lock is protected from the elements with its highly corrosion-resistant aluminum construction. It also features a grey powder coat finish for maximum corrosion prevention
• TWO KEYS INCLUDED. For your convenience, two keys are included with this trailer tongue lock. You can keep the spare key in a discrete location for emergencies or give it to a friend for helpful access

CURT

• Crafted from the highest quality material
• Perfect for outdoor and even indoor use
• Made in China
• One size fits all (from 1-7/8", 2", to 2-5/15", all coupler types)
• Key hole cover slides up to seal out dirt and grime
• Type A key which is a spring loaded, 7 pin, high security key. Resists attempted drill outs. Rugged and durable, the key will not bend or break.
• Huge 6 tooth, 3/8" dual ratchet locking system
• Hardened 5/8" 16mm steel shackle

Trimax

• CZC AUTO Trailer Hitch Coupler Locking Pin Design：1/4 Inch diameter tongue lock pin with effective length 3/4 Inch. Small size for easy carrying. Keeping the coupler lock in your pocket or vehicle anywhere that is fine. Please verify dimension and length of the pin you want before purchasing our coupler hitch lock pin.
• How To Operate Our Trailer Tongue Coupler Lock: Spinning the flat key 5-7 times to open or close the hitch lock.
• Security Of Our Coupler Locking Pin: This trailer lock is made of high-strength steel to deter theft. The hitch lock is coated with black electrophoretic paint to prevent corrosion.
• Coupler Locking Hitch Pin's Application: Tow Trailer Boat RV Truck Car
• CZC AUTO - A Reliable Brand In Hitch Sercurity Industry: We offer 30-day money-back guarantee for any reason, 12-month warranty for quality-related issues. If you have any question after receiving or using our trailer tongue lock, please contact us, your problem will be solved within 24 HOURS.

CZC AUTO

• Universal, fits all couplers
• Secures trailer when not being towed
• Ratchet design with eleven locking positions
• Fits 1-7/8, 2 and 2-5/16 inch trailers
• Two theft proof square keys are included

Reese

• DEPENDABLE SECURITY. To help protect your trailer from theft, this trailer lock is made from high-strength steel and has a padlock-style design
• EASY TO OPERATE. This padlock-style trailer tongue lock has a heavy-duty look to deter theft, and uses a simple 1/4-turn lock activation for convenient locking and unlocking as needed
• VERSATILE. With a 1/4-inch diameter pin, this trailer coupler lock fits latch-type couplers with a maximum span of up to 3/4 inches
• WEATHER-RESISTANT. This trailer pin lock is protected from the elements with its black painted finish, while the coupler pin is shielded against corrosion with a durable zinc plating
• TWO KEYS INCLUDED. For your convenience, two keys are included with this trailer tongue lock. You can keep the spare key in a discrete location for emergencies or give it to a friend for helpful access

CURT

• DIMENSIONS: 9” x 9” x 3”
• BUILT TO LAST: The REESE Towpower Universal Coupler lock is a premium lock constructed with an aluminum body and heavy-duty steel lock bar.
• UNIVERSAL FIT: Ratchet design is adjustable with 11 locking positions and fits 1-⅞”, 2”, and 2-5/16” couplers.
• DETERS THEFT: Bright, deterrent yellow color is durable, highly visible, and an essential accessory to all types of trailers.
• SECURE PROTECTION: Easy-to-install lock resists picking, prying and drill outs. Guards against truck or trailer towaway theft in storage.

Reese

• Design shields lock from tampering devices
• Fits most 2 inch trailer couplers
• Coupler width (including lip) cannot exceed 3-13/16 inches
• Height of coupler lip cannot be greater than 5/16 inch
• No wrench or special tools needed

Tow Ready