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Zinc alloys offer high strengths to 60, 000 psi and superior elongation for strong designs and formability for bending, crimping and riveting operations. In stock with a delivery time of 1 to 5 days. Few materials provide the strength and toughness of zinc alloys.
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 comes with two keys, therefore you will receive a total of six keys with the purchase of this 3 pack. Rekeyable cylinder for keyed alike convenience with an advanced locking mechanism that resists picking and prying. 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.






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.

To ensure you get two 4-packs keyed alike, you must order the 8-pack. Durable design: aluminum diecast finish resists rust and corrosion. Limited lifetime Warranty provides peace of mind from a brand you can trust.
1. Master Lock
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Master Lock 3895DAT, Coupler Lock, Receiver Lock and Latch Lock, 3 Components Keyed Alike
#adMaster Lock #ad - For more detailed information, please click "See More Product Details". The limited lifetime Warranty provides peace of mind from a brand you can trust. Complete trailer security system KEYED ALIKE.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. |
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2. Master Lock
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Trailer Locks #389DAT, 2", Master Lock, Universal Size Fits 1-7/8", and 2-5/16" Couplers
#adMaster Lock #ad - The bright red finish discourages thiefs from messing with your trailer. Simple installation and removal. Universal coupler lock fits virtually all 1-7/8", 2", and 2-5/16" trailer couplers.More information #ad
Resists rust and corrosion. Advanced locking mechanism resists picking and prying. This lock protects unattended trailers and guards against tow-away theft.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. |
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3. Master Lock
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Master Lock, 3 Keyed Alike Universal Trailer Coupler Locks 379KA-3
#adMaster Lock #ad - These locks protects unattended trailers and guards against tow-away theft. The same key opens all three locks. The universal trailer coupler lock fits 1-7/8in 48mm, lainson, fulton, Putnam, Hammerblow, Valley, Dutton, 2in 51mm and most 2-5/16in 59mm couplers by Reese, Atwood, Shelby, and UFP.Zinc alloys offer high strengths to 60, 000 psi and superior elongation for strong designs and formability for bending, crimping and riveting operations. In stock with a delivery time of 1 to 5 days. Few materials provide the strength and toughness of zinc alloys.
More information #ad
Each lock weighs 2. 4 lbs. Limited Lifetime warranty. Made with reinforced zinc die-cast resists rust and corrosion. Impact resistance is significantly higher than cast aluminium alloys, plastics, and grey cast iron. And is simple to install and remove. 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 comes with two keys, therefore you will receive a total of six keys with the purchase of this 3 pack. Rekeyable cylinder for keyed alike convenience with an advanced locking mechanism that resists picking and prying. 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.
Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
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. |
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4. Master Lock
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Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer Couplers, Master Lock 377KA Trailer Hitch Lock
#adMaster Lock #ad - Trailer hitch lock is constructed from zinc to resist rust and corrosion. Trailer hitch lock fits 1-7/8 in. One trailer coupler lock, two keys.More information #ad
Trailer coupler lock features advanced locking mechanism to resist picking and prying. 51mm and most 2-5/16 in. Trailer lock is best used for vehicles, trailers, and RVs. 48mm, 2 in. 59mm trailer couplers.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Height | 2.8 Inches |
Length | 5.6 Inches |
Width | 4.3 Inches |
Part Number | 377KA |
Model | 377KA |
Warranty | Limited Lifetime Warranty |
More information #ad
5. Master Lock
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Master Lock 605DAT Trailer Coupler Padlock, 2 Pack
#adMaster Lock #ad - Protected case-hardened steel shackle resists cutting and built-in anti-sawing pin for maximum protection. Matching colored keyhead for added convenience. This listing is for two 2 solid brass coupler latch locks.More information #ad
Limited lifetime warranty. Solid brass case for corrosion resistance. Works on all 1-7/8" and 2" coupler latches, but not all 2-5/16". Opening measures exactly 3/4". These locks are NOT keyed alike. Simple installation and removal.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Height | 5.56 Inches |
Length | 0.9 Inches |
Weight | 1 Pounds |
Width | 3.5 Inches |
Part Number | 605DAT |
Model | 605DAT |
Warranty | As Labeled |
More information #ad
6. Master Lock
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Master Lock 379ATPY Universal Trailer Hitch Lock , Black
#adMaster Lock #ad - Trailer hitch lock fits 1-7/8 in. 51mm and most 2-5/16 in. Trailer hitch lock is constructed from zinc to resist rust and corrosion. Trailer coupler lock features advanced locking mechanism to resist picking and prying.More information #ad
Includes one trailer coupler lock, two keys. 59mm trailer couplers. Trailer lock is best used for vehicles, trailers, and RVs. 48mm, 2 in.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
7. Master Lock
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Master Lock Trailer Lock, Stainless Steel Adjustable Coupler Latch Lock, 2847DAT
#adMaster Lock #ad - Specifications: coupler lock adjusts from 9/16 in. Ease of use: six locking positions provide maximum flexibility; Rekeyable cylinder offers keyed-alike convenience.More information #ad
Lock application: Best used for vehicles, trailers, and RV hitch locks. Includes: one trailer coupler latch lock, two keys. To 2-3/4 in. Durable design: Water-tight cap protects trailer hitch lock from moisture and dirt. Length.Brand | Master Lock #ad |
Manufacturer | MASTER LOCK COMPANY LLC #ad |
Height | 2 Inches |
Length | 7 Inches |
Weight | 0.25 Pounds |
Width | 4 Inches |
Part Number | 2847DAT |
Model | 2847DAT |
Warranty | Limited Warranty |
More information #ad
8. Master Lock
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Master Lock Trailer Lock, Silver , Universal Trailer Coupler Lock, 379DAT , Standard
#adMaster Lock #ad - 48 mm, 2 in. 59 mm couplers: reese, atwood, shelby, Fulton, Putnam, Valley, Dutton Lainson, Hammerblow, UFP. Trailer hitch lock is easy to install and remove.More information #ad
51 mm and 2-5/16 in. Best used for vehicles, trailers, and RV hitch locks. Fits most 1-7/8 in. Includes one coupler lock, two keys. Trailer coupler resists rust and corrosion; Advanced locking mechanism resists picking and prying.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Height | 6.56 Inches |
Length | 2.68 Inches |
Weight | 1.8 Pounds |
Width | 7.5 Inches |
Part Number | 379DAT |
Model | 379DAT |
Warranty | Limited Warranty |
More information #ad
9. Master Lock
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Master Lock 1471DAT Trailer Coupler Latch Lock, 3-4/10" Long Shackle x 9/32" Diameter Pin
#adMaster Lock #ad - 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.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.
More information #ad
This master lock protects and guards against tow-away theft. K1 key blank. Chrome plated for improved wear and corrosion resistance. It has a precision 4 pin tumbler mechanism that resists picking. Fits ufp and surge brake couplers.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
10. Master Lock
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Fits 1-7/8" and 2" Couplers, Master Lock, 4 Keyed Alike Trailer Coupler Locks 377KA-4
#adMaster Lock #ad - For 2-5/16" couplers we recommend a different lock, search Master Lock 379KA. Advanced locking mechanism resists picking and prying.To ensure you get two 4-packs keyed alike, you must order the 8-pack. Durable design: aluminum diecast finish resists rust and corrosion. Limited lifetime Warranty provides peace of mind from a brand you can trust.
More information #ad
Specifications: fits 1-7/8", 2" and some 2-5/16" trailer couplers. Easy to install and remove. This listing is for 4 four 377KA coupler locks keyed alike and 8 keys. Attention: if you order two 4-packs they will NOT necessarily be keyed the same.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Weight | 8 Pounds |
Part Number | 377KA-4 |
Model | 377KA-4 |
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