As an Amazon Associate I earn from qualifying purchases.
Dependable security. Easy to operate. Two keys included. 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.

Money back guarantee your satisfaction is what we strive for. Package include one lock pin 1/4" diameter&3-1/2 span + one lock head 361°rotating design& water proof rubber cap + two tubular keys one for standby.
Push-to-lock design our trailer coupler lock is designed for easy operation. With the push-to-lock design, you can easily push to lock it without using key. Rust protection& durability the electrophoretic paint on the surface of trailer pin lock with the addition of its watertight rubber cap, keep rust at bay even the lock always get soaked on any journey over wet or snowy roads, and keep the keyhole away from water and dirt.

Kinds of weather can be handled. You can put the spare key in a separate location for emergencies. Dependable security: czc auto trailer lock pin is made of carbon steel, solid and hard to bend. Please note: any problem in using czC AUTO trailer tongue lock, your problem will be solved within 24 HOURS.
2 keys included: for convenience, our trailer hitch coupler lock comes with two keys. Zinc alloy tubular lock core & solid round key also help to improve security. Warranty: we offer 30-day money-back guarantee for any reason, simply contact us, 12-month warranty for quality-related issues. Easy to use: czc auto dogbone style hitch lock has a 360 degree rotating head, after hearing "click", easy to handle. Convenient to use.





Pin length or dimensional fit is 3-1/2" wide with a 9/32" diameter pin which is a standard size on virtually all couplers. This master lock protects and guards against tow-away theft. Fits ufp and surge brake couplers.


With a 1/4-inch diameter, segmented pin, this trailer coupler lock fits latch-type couplers spanning from 1 inch up to 3 inches.
This right-angle trailer lock has a built-in swivel feature and simple 1/4-turn lock activation to allow the head to twist toward you for easy, ergonomic access when locking or unlocking your trailer. Versatile. Two keys included. Dependable security. Ergonomic operation. Watertight.
1. CURT
#ad
Up to 3/4-Inch Span, 1/4-Inch Pin Diameter, CURT 23521 Black Trailer Tongue Coupler Lock
#adCURT #ad - You can keep the spare key in a discrete location for emergencies or give it to a friend for helpful access. 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.Dependable security. Easy to operate. Two keys included. 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.
More information #ad
For your convenience, two keys are included with this trailer tongue lock. To help protect your trailer from theft, this trailer lock is made from high-strength steel and has a padlock-style design. 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. Weather-resistant.Brand | CURT #ad |
Manufacturer | Curt Manufacturing #ad |
Height | 2 Inches |
Length | 7 Inches |
Weight | 0.45 Pounds |
Width | 2 Inches |
Part Number | 23521 |
Model | 23521 |
Warranty | Limited Lifetime Warranty (One-Year Finish, One-Year Parts) |
More information #ad
2. METOWARE
#ad
Black Trailer Pin Lock for Towing Trailer RV Car Boat Truck 1 Pack, Trailer Hitch Lock for Latch-Type Coupler, METOWARE Trailer Tongue Coupler Lock 1/4" Dia, 3-1/2" Span
#adMETOWARE #ad - Its reinforced zinc alloy tubular lock core and stronger tubular keys improve the security. If something goes wrong with your purchase, we will offer you a free replacement or a full refund. Security guarantee made of heavy-duty steel, our trailer hitch is durably and strong.Money back guarantee your satisfaction is what we strive for. Package include one lock pin 1/4" diameter&3-1/2 span + one lock head 361°rotating design& water proof rubber cap + two tubular keys one for standby.
More information #ad
And if you have any question about the product, please feel free to contact us, click on 'Ask a question' button on the right hand side on this page and send us an email, we will make a quick and reliable response. To open it, just turn the key a little bit and the pin will pop out by itself. Push-to-lock design our trailer coupler lock is designed for easy operation. With the push-to-lock design, you can easily push to lock it without using key. Rust protection& durability the electrophoretic paint on the surface of trailer pin lock with the addition of its watertight rubber cap, keep rust at bay even the lock always get soaked on any journey over wet or snowy roads, and keep the keyhole away from water and dirt.
Brand | METOWARE #ad |
Manufacturer | METOWARE #ad |
Part Number | 40891 |
More information #ad
3. CZC AUTO
#ad
Black Trailer Pin Lock with Keys for Towing Boat Truck Trailer RV Car, CZC AUTO Trailer Lock 1/4" Dia, Trailer Coupler Lock 3-3/8" Span Trailer Tongue Lock Fits Latch-Type Coupler
#adCZC AUTO #ad - Coated with black electrophoretic paint to prevent corrosion. When you turn key to open the lock, the pin will pop up automatically. The watertight rubber cap keeps rain, snow, ice and dirt out. Simple push-to-lock design without key, please pull the lock head again to make sure that it is locked.Kinds of weather can be handled. You can put the spare key in a separate location for emergencies. Dependable security: czc auto trailer lock pin is made of carbon steel, solid and hard to bend. Please note: any problem in using czC AUTO trailer tongue lock, your problem will be solved within 24 HOURS.
More information #ad
Please verify dimension and length of the pin before purchasing our trailer pin lock with keys. Widely applicable: 1/4" trailer lock with a maximum 3-3/8'' effective span, CZC AUTO trailer coupler lock fits latch-type couplers for towing boat truck RV car. 2 keys included: for convenience, our trailer hitch coupler lock comes with two keys. Zinc alloy tubular lock core & solid round key also help to improve security. Warranty: we offer 30-day money-back guarantee for any reason, simply contact us, 12-month warranty for quality-related issues. Easy to use: czc auto dogbone style hitch lock has a 360 degree rotating head, after hearing "click", easy to handle. Convenient to use.
Brand | CZC AUTO #ad |
Manufacturer | CZC AUTO #ad |
Part Number | 11408 |
More information #ad
4. Reese
#ad
Reese Towpower 7088300 Heavy Duty Coupler Lock , Grey
#adReese #ad - Two theft proof square keys are included. Bright theft deterrent silver. Ratchet design with eleven locking positions. Fits 1-7/8, 2 and 2-5/16 inch trailers. Universal, fits all couplers. Secures trailer when not being towed.More information #ad
Brand | Reese #ad |
Manufacturer | Reese Towpower #ad |
Height | 0 Inches |
Length | 0 Inches |
Weight | 4 Pounds |
Width | 0 Inches |
Part Number | 7088300 |
Model | 7088300 |
Warranty | 1 Year |
More information #ad
5. Trimax
#ad
Trimax TMC10 Coupler / Door Latch Lock fits couplers to 3/4" span
#adTrimax #ad - Protective rubber cap protects keyhole from water, grime, and dirt. Fits couplers with up to a 3/4" span. Resists attempted drill outs. Internal o-ring in lock keeps water, grime and dirt out of locking mechanism to ensure years of use.More information #ad
Protective rubber bumper prevents rattling and abrasion. Rugged and durable, 7 pin, the key will not bend or break. Type a key which is a spring loaded, high security key.Brand | Trimax #ad |
Manufacturer | Trimax Locks - Wyers Products #ad |
Height | 5.1 Inches |
Length | 1.5 Inches |
Weight | 0.65 Pounds |
Width | 3.9 Inches |
Part Number | TMC10 |
Model | TMC10 |
Warranty | Lifetime Warranty |
More information #ad
6. Master Lock
#ad
3 Components Keyed Alike, Master Lock 3895DAT, Coupler Lock, Receiver Lock and Latch Lock
#adMaster Lock #ad - The limited lifetime Warranty provides peace of mind from a brand you can trust. Complete trailer security system KEYED ALIKE. For more detailed information, please click "See More Product Details".More information #ad
1 coupler lock, 1 receiver lock & 1 latch lock all keyed alike; 1 key opens all 3 locks. This lock set can not be keyed alike with other locks nor can 2 of these lock sets be keyed alike.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Height | 3.5 Inches |
Length | 9 Inches |
Width | 6.25 Inches |
Part Number | 3895DAT |
Model | 3895DAT |
Warranty | MASTER LOCK PRODUCT WARRANTY: Limited Lifetime Warranty. Master Lock Company LLC (Master Lock) grants the following warranty: If this product or any part of the product fails due to a defect in materials or workmanship at any time during the life of the product, Master Lock will, at its own discretion, repair or replace the product or part free of charge. Simply contact Master Lock at www.masterlock.com or 1.800.464.2088 for instructions on obtaining repair or replacement. |
More information #ad
7. Reese
#ad
Reese Towpower 7042100 Adjustable Coupler Latch Lock
#adReese #ad - 3/16 inch diameter pin fits most couplers. 6 locking positions. Flat key design. Nickel plated steel shank and brushed aluminum body. Adjusts from 5/8 inch to 3 inches.More information #ad
Brand | Reese #ad |
Manufacturer | Reese Towpower #ad |
Height | 2 Inches |
Length | 6 Inches |
Weight | 0.2 Pounds |
Width | 2 Inches |
Part Number | 7042100 |
Model | 7042100 |
Warranty | 1 Year |
More information #ad
8. Master Lock
#ad
3-4/10" Long Shackle x 9/32" Diameter Pin, Master Lock 1471DAT Trailer Coupler Latch Lock
#adMaster Lock #ad - The lock prevents the coupler latch from moving, therefore preventing either the coupler to be removed from the ball, or not allowing a ball to be placed into the coupler.Pin length or dimensional fit is 3-1/2" wide with a 9/32" diameter pin which is a standard size on virtually all couplers. This master lock protects and guards against tow-away theft. Fits ufp and surge brake couplers.
More information #ad
K1 key blank. It has a precision 4 pin tumbler mechanism that resists picking. Chrome plated for improved wear and corrosion resistance. Weather tough seal and water tight cap protects the lock from the elements. The lock works when the trailer is either connected to the tow vehicle or when the trailer is unattached.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Height | 2 Inches |
Length | 9.1 Inches |
Weight | 0.75 Pounds |
Width | 5 Inches |
Part Number | 1471DAT |
Model | 1471DAT |
Warranty | 2 year manufacturer |
More information #ad
9. Master Lock
#ad
Universal Size Fits 1-7/8", and 2-5/16" Couplers, Trailer Locks #389DAT, 2", Master Lock
#adMaster Lock #ad - The bright red finish discourages thiefs from messing with your trailer. This lock protects unattended trailers and guards against tow-away theft.More information #ad
Resists rust and corrosion. Simple installation and removal. Universal coupler lock fits virtually all 1-7/8", 2", and 2-5/16" trailer couplers. Advanced locking mechanism resists picking and prying.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Height | 7.5 Inches |
Length | 6.5 Inches |
Weight | 1 Pounds |
Width | 4 Inches |
Part Number | 389DAT |
Model | 389DAT |
Warranty | MASTER LOCK PRODUCT WARRANTY Limited Lifetime Warranty Master Lock Company LLC (“Master Lock”) grants the following warranty: If this product or any part of the product fails due to a defect in materials or workmanship at any time during the life of the product, Master Lock will, at its own discretion, repair or replace the product or part free of charge. Simply contact Master Lock at www.masterlock.com or 1.800.464.2088 for instructions on obtaining repair or replacement. |
More information #ad
10. CURT
#ad
1/4-Inch Pin Diameter, CURT 23503 Right-Angle Trailer Coupler Lock, Up to 3-Inch Span
#adCURT #ad - To help protect your trailer from theft, this trailer tongue lock is made with high-strength steel construction. The internal components of this trailer pin lock can easily be protected from the elements with the included watertight dust cap, while the coupler lock head is shielded against corrosion with a durable anodized aluminum finish.With a 1/4-inch diameter, segmented pin, this trailer coupler lock fits latch-type couplers spanning from 1 inch up to 3 inches.
More information #ad
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. This right-angle trailer lock has a built-in swivel feature and simple 1/4-turn lock activation to allow the head to twist toward you for easy, ergonomic access when locking or unlocking your trailer. Versatile. Two keys included. Dependable security. Ergonomic operation. Watertight.
Brand | CURT #ad |
Manufacturer | Curt Manufacturing #ad |
Height | 2 Inches |
Length | 7 Inches |
Weight | 0.5 Pounds |
Width | 2 Inches |
Part Number | 23503 |
Model | 23503 |
Warranty | Limited Lifetime Warranty (One-Year Finish, One-Year Parts) |
More information #ad