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It also rotates less rigidity making it harder to break with sledge hammer force. Impact resistance is significantly higher than cast aluminium alloys, plastics, 000 psi and superior elongation for strong designs and formability for bending, and grey cast iron.
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. Limited Lifetime warranty. This is a set of 3 keyed alike trailer coupler/tongue locks and is ideal when needing multiple locks that utilize ONLY one key. Each lock weighs 2. 4 lbs. Zinc alloys offer high strengths to 60, crimping and riveting operations.

Zinc alloys offer high strengths to 60, 000 psi and superior elongation for strong designs and formability for bending, plastics, crimping and riveting operations. The universal trailer coupler lock fits 1-7/8in 48mm, dutton, hammerblow, Valley, 2in 51mm and most 2-5/16in 59mm couplers by Reese, Atwood, Fulton, Putnam, Lainson, Shelby, and UFP.
Each lock comes with two keys, therefore you will receive a total of six keys with the purchase of this 3 pack. Each lock weighs 2. 4 lbs. It also rotates less rigidity making it harder to break with sledge hammer force. Made with reinforced zinc die-cast resists rust and corrosion. In stock with a delivery time of 1 to 5 days. The same key opens all three locks.



Deters theft: bright, deterrent yellow color is durable, highly visible, and an essential accessory to all types of trailers.





For 2-5/16" couplers we recommend a different lock, search Master Lock 379KA. Durable design: aluminum diecast finish resists rust and corrosion. To ensure you get two 3-packs keyed alike, you must order the 6-pack.
1. Master Lock
#ad
Master Lock, 3 Keyed Alike Universal Trailer Coupler Locks 379KA-3
#adMaster Lock #ad - Rekeyable cylinder for keyed alike convenience with an advanced locking mechanism that resists picking and prying. Made with reinforced zinc die-cast resists rust and corrosion. Few materials provide the strength and toughness of zinc alloys.It also rotates less rigidity making it harder to break with sledge hammer force. Impact resistance is significantly higher than cast aluminium alloys, plastics, 000 psi and superior elongation for strong designs and formability for bending, and grey cast iron.
More information #ad
Each lock comes with two keys, therefore you will receive a total of six keys with the purchase of this 3 pack. And is simple to install and remove. The same key opens all three locks. 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. Limited Lifetime warranty. This is a set of 3 keyed alike trailer coupler/tongue locks and is ideal when needing multiple locks that utilize ONLY one key. Each lock weighs 2. 4 lbs. Zinc alloys offer high strengths to 60, crimping and riveting operations.
Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Weight | 2.4 Pounds |
Part Number | B007C4US1S |
Model | 379KA-3 |
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
2. Trailer Coupler Locks - Keyed Alike
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Master Lock, 3 Keyed Alike Universal Trailer Coupler Locks 379KA-3
#adTrailer Coupler Locks - Keyed Alike #ad - These locks protects unattended trailers and guards against tow-away theft. This is a set of 3 keyed alike trailer coupler/tongue locks and is ideal when needing multiple locks that utilize ONLY one key. Impact resistance is significantly higher than cast aluminium alloys, and grey cast iron.Zinc alloys offer high strengths to 60, 000 psi and superior elongation for strong designs and formability for bending, plastics, crimping and riveting operations. The universal trailer coupler lock fits 1-7/8in 48mm, dutton, hammerblow, Valley, 2in 51mm and most 2-5/16in 59mm couplers by Reese, Atwood, Fulton, Putnam, Lainson, Shelby, and UFP.
More information #ad
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. Each lock comes with two keys, therefore you will receive a total of six keys with the purchase of this 3 pack. Each lock weighs 2. 4 lbs. It also rotates less rigidity making it harder to break with sledge hammer force. Made with reinforced zinc die-cast resists rust and corrosion. In stock with a delivery time of 1 to 5 days. The same key opens all three locks.
Brand | Trailer Coupler Locks - Keyed Alike #ad |
Manufacturer | Trailer Coupler Locks - Keyed Alike #ad |
Part Number | 379KA3 |
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
3. Trailer Coupler Locks - Keyed Alike
#ad
1 Keyed Alike Universal Trailer Coupler Locks 379KA, Master Lock
#adTrailer Coupler Locks - Keyed Alike #ad - Limited lifetime warranty. Advanced locking mechanism resists picking and prying and is rekeyable - for rekeying see your authorized Master Lock locksmith.More information #ad
Resists rust and corrosion. Each lock weighs 2. 4 lbs. A high quality trailer coupler tongue lock. Fits virtually all 1-7/8, 2", and 2-5/16" couplers. Simple installation and removal.Brand | Trailer Coupler Locks - Keyed Alike #ad |
Manufacturer | Trailer Coupler Locks - Keyed Alike #ad |
Part Number | 379 |
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
4. Master Lock
#ad
Trailer Locks #389DAT, Master Lock, Universal Size Fits 1-7/8", 2", and 2-5/16" Couplers
#adMaster Lock #ad - Simple installation and removal. This lock protects unattended trailers and guards against tow-away theft. The bright red finish discourages thiefs from messing with your trailer.More information #ad
Universal coupler lock fits virtually all 1-7/8", 2", and 2-5/16" trailer couplers. Advanced locking mechanism resists picking and prying. Resists rust and corrosion.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
5. Reese
#ad
Adjustable Storage Security, Heavy-Duty Steel, REESE Towpower 72783 Coupler Lock
#adReese #ad - Universal fit: ratchet design is adjustable with 11 locking positions and fits 1-⅞”, 2”, and 2-5/16” couplers. Built to last: the reese towpower universal coupler lock is a premium lock constructed with an aluminum body and heavy-duty steel lock bar.Deters theft: bright, deterrent yellow color is durable, highly visible, and an essential accessory to all types of trailers.
More information #ad
Distance between lock shackle holes center to center is 4-1/2 inch. Guards against truck or trailer towaway theft in storage. Dimensions: 9” x 9” x 3”. Secure protection: easy-to-install lock resists picking, prying and drill outs.Brand | Reese #ad |
Manufacturer | Reese Towpower #ad |
Height | 9 Inches |
Length | 9 Inches |
Weight | 1 Pounds |
Width | 3 Inches |
Part Number | 72783 |
Model | 72783 |
Warranty | 1 Year |
More information #ad
6. Reese
#ad
Reese Towpower 7088300 Heavy Duty Coupler Lock , Grey
#adReese #ad - Bright theft deterrent silver. Universal, fits all couplers. Ratchet design with eleven locking positions. Fits 1-7/8, 2 and 2-5/16 inch trailers. Secures trailer when not being towed. Two theft proof square keys are included.More information #ad
Brand | Reese #ad |
Manufacturer | Reese Towpower #ad |
Height | 0 Inches |
Length | 0 Inches |
Weight | 3.85 Pounds |
Width | 0 Inches |
Part Number | 7088300 |
Model | 7088300 |
Warranty | 1 Year |
More information #ad
7. Master Lock
#ad
Black, Master Lock 379ATPY Universal Trailer Hitch Lock
#adMaster Lock #ad - Trailer lock is best used for vehicles, trailers, and RVs. Trailer hitch lock fits 1-7/8 in. 51mm and most 2-5/16 in. Includes one trailer coupler lock, two keys.More information #ad
Trailer coupler lock features advanced locking mechanism to resist picking and prying. Trailer hitch lock is constructed from zinc to resist rust and corrosion. 48mm, 2 in. 59mm trailer couplers.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Height | 4.6 Inches |
Length | 5.1 Inches |
Weight | 2 Pounds |
Width | 3.5 Inches |
Part Number | 379ATPY |
Model | 379ATPY |
Warranty | 1 year manufacturer |
More information #ad
8. Master Lock
#ad
Red, Master Lock 389DAT 2 Pack Universal Trailer Coupler Lock
#adMaster Lock #ad - Advanced locking mechanism resists picking and prying. These 2 locks are keyed differently, they do not have the same key number. The bright red finish discourages thiefs from messing with your trailer.More information #ad
Resists rust and corrosion. Simple installation and removal. This lock protects unattended trailers and guards against tow-away theft. Universal coupler lock fits virtually all 1-7/8", 2", and 2-5/16" trailer couplers.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Height | 8.4 Inches |
Length | 8.9 Inches |
Weight | 1.52 Pounds |
Width | 8.7 Inches |
Part Number | 389DATPKOF2 |
Model | 389DAT |
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
9. Trimax
#ad
Trimax UMAX100 Premium Universal Dual Purpose Coupler Lock , Black
#adTrimax #ad - One size fits all from 1-7/8", 2", to 2-5/16", all coupler types. Weighs 6 pounds. Resists attempted drill outs. Crafted from the highest quality material. Perfect for outdoor and even indoor use.More information #ad
Made in China. Type a key which is a spring loaded, 7 pin, high security key. Rugged and durable, the key will not bend or break. Attractive ballistic grade nylon housing absorbs hammer blows and protects against weather. Key hole cover slides up to seal out dirt and grime.Brand | Trimax #ad |
Manufacturer | Trimax Locks - Wyers Products #ad |
Height | 13 Inches |
Length | 17 Inches |
Weight | 1 Pounds |
Width | 13 Inches |
Part Number | UMAX100 |
Model | UMAX100 |
Warranty | Manufacturer Warranty |
More information #ad
10. Master Lock
#ad
Fits 1-7/8" and 2" Couplers, Master Lock, 3 Keyed Alike Trailer Coupler Locks 377KA-3
#adMaster Lock #ad - Attention: if you order two 3-packs they will NOT necessarily be keyed the same. Advanced locking mechanism resists picking and prying.For 2-5/16" couplers we recommend a different lock, search Master Lock 379KA. Durable design: aluminum diecast finish resists rust and corrosion. To ensure you get two 3-packs keyed alike, you must order the 6-pack.
More information #ad
This listing is for 3 three 377KA coupler locks keyed alike and 6 keys. Limited lifetime Warranty provides peace of mind from a brand you can trust. Specifications: fits 1-7/8", 2" and some 2-5/16" trailer couplers. Easy to install and remove.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Weight | 10 Pounds |
Part Number | 377KA-3 |
Model | 377KA-3 |
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