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Each lock comes with two keys, therefore you will receive a total of eight keys with the purchase of this 4 pack. 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 universal trailer coupler lock fits 1-7/8in 48mm, lainson, hammerblow, Valley, Shelby, Putnam, Fulton, 2in 51mm and most 2-5/16in 59mm couplers by Reese, Dutton, Atwood, and UFP. The same key opens all four locks. Few materials provide the strength and toughness of zinc alloys. This is a set of 4 keyed alike trailer coupler/tongue locks and is ideal when needing multiple locks that utilize ONLY one key. In stock with a delivery time of 1 to 5 days.



Please verify dimension and length of the pin you want before purchasing our coupler hitch lock pin.
Keeping the coupler lock in your pocket or vehicle anywhere that is fine. 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, please contact us, 12-month warranty for quality-related issues.


For 2-5/16 couplers the better lock set is: master Lock - 6 Trailer Locks Keyed Alike #6KA-3796230-3. Latch lock doesn't fit some 2-5/16" couplers. See description below for latch lock #37 applications.

5" receivers. Spring clip cotter pin provides additional safety - a separate spring clip cotter pin provides additional safety, can use the locking pin with or without the lock mechanism. Caution: r spring clip cotter pin MUST be inserted into pin hole when use this lock.
This lock does not fit curt channel style adjustable ball mounts 45900, please verify all dimensions of your hitch, 45908. This lock does not fit andersen Rapid Hitch kits and FASTWAY adjustable ball mounts. Different brand hitches may have a little different hitch tube size, please adjust O ring quantity or remove O ring to fit the receivers. Push lock design make easy to use - 6 tubular keyed alike keys making it easier to lock and unlock, 1/4 turn lock and push lock design, easy to operate, watertight dust rubber cap prevents locking mechanism internal corrosion.


Rekeyable cylinder for keyed alike convenience with an advanced locking mechanism that resists picking and prying. Limited Lifetime warranty. In stock with a delivery time of 1 to 5 days.
Made with reinforced zinc die-cast resists rust and corrosion. These locks protects unattended trailers and guards against tow-away theft. Each lock comes with two keys, therefore you will receive a total of six keys with the purchase of this 3 pack. Few materials provide the strength and toughness of zinc alloys. Impact resistance is significantly higher than cast aluminium alloys, and grey cast iron.

1. Master Lock
#ad
Master Lock, 4 Keyed Alike Universal Trailer Coupler Locks 379KA-4
#adMaster Lock #ad - Limited Lifetime warranty. Made with reinforced zinc die-cast resists rust and corrosion. Each lock weighs 2. 4 lbs. And is simple to install and remove. It also rotates less rigidity making it harder to break with sledge hammer force. Impact resistance is significantly higher than cast aluminium alloys, and grey cast iron.Each lock comes with two keys, therefore you will receive a total of eight keys with the purchase of this 4 pack. 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.
More information #ad
These locks protects unattended trailers and guards against tow-away theft. 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, lainson, hammerblow, Valley, Shelby, Putnam, Fulton, 2in 51mm and most 2-5/16in 59mm couplers by Reese, Dutton, Atwood, and UFP. The same key opens all four locks. Few materials provide the strength and toughness of zinc alloys. This is a set of 4 keyed alike trailer coupler/tongue locks and is ideal when needing multiple locks that utilize ONLY one key. In stock with a delivery time of 1 to 5 days.
Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Part Number | B007BPTZU8 |
Model | 379KA-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
2. Trimax
#ad
Pack of 2, Trimax THP2XL Keyed Alike Trailer Door Lock
#adTrimax #ad - Protects against bolt cutters, no exposed shackle to cut or saw. Two pack of tHPXL are keyed alike. 2-7/8" diameter. Solid steel and thicker body with 3/8" diameter internal shackle. Enlarged opening covers and secures ALL trailer hasps.More information #ad
Brand | Trimax #ad |
Manufacturer | Trimax Locks - Wyers Products #ad |
Height | 4 Inches |
Length | 7.9 Inches |
Weight | 1 Pounds |
Width | 4.4 Inches |
Part Number | THP2XL |
Model | THP2XL |
Warranty | Lifetime |
More information #ad
3. Red Hound Auto
#ad
Red Hound Auto 10 Stainless Steel Armor Disc Padlocks Trailer/Self Storage Locks Keyed Alike
#adRed Hound Auto #ad - Resists sawing or cutting with its stainless steel body and hardened steel shackle. 10 heavy duty premium Circular Disc Padlocks with 2 Keys per lock. Heavy duty corrosion Resistant Stainless Steel. 2-3/4" 70mm diameter Lock. Premium quality Red Hound Auto Stainless Steel.More information #ad
Brand | Red Hound Auto #ad |
Manufacturer | Red Hound Auto #ad |
Height | 1 Inches |
Length | 11.62 Inches |
Width | 15.12 Inches |
Part Number | RED949368 |
Warranty | 1 year Limited |
More information #ad
4. CZC AUTO
#ad
Dia 1/4 Inch, CZC AUTO Black Trailer Hitch Coupler Lock, 3/4 Inch Span for Tow Boat RV Truck Car's Coupler 2 Pack keyed Alike, Black
#adCZC AUTO #ad - Czc auto trailer hitch coupler locking pin design:1/4 inch diameter tongue lock pin with effective length 3/4 Inch. The hitch lock is coated with black electrophoretic paint to prevent corrosion. How to operate our trailer tongue Coupler Lock: Spinning the flat key 5-7 times to open or close the hitch lock.Please verify dimension and length of the pin you want before purchasing our coupler hitch lock pin.
More information #ad
If you have any question after receiving or using our trailer tongue lock, your problem will be solved within 24 HOURS. Small size for easy carrying. Security of our coupler locking pin: this trailer lock is made of high-strength steel to deter theft. Keeping the coupler lock in your pocket or vehicle anywhere that is fine. 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, please contact us, 12-month warranty for quality-related issues.
Brand | CZC AUTO #ad |
Manufacturer | CZC AUTO #ad |
Part Number | 11410 S |
More information #ad
5. Master Lock
#ad
Master Lock, 6 Trailer Locks Keyed Alike #6KA-37940-37
#adMaster Lock #ad - Multiple 6ka trailer lock packages can be keyed alike. Latch lock doesn't fit some 2-5/16" couplers. See description below for latch lock #37 applications. Coupler lock fits 1-7/8", 2", & 2-5/16" couplers. Each lock comes with two keys, for a total of twelve keys.More information #ad
For 2-5/16 couplers the better lock set is: Master Lock - 6 Trailer Locks Keyed Alike #6KA-37940-3. If you ordered a quanity of 2, 3 etc we would automatically key them all the same. Total trailer security Keyed Alike - One key opens all six locks.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Part Number | 6KA-37940-37 |
Model | 6KA-37940-37 |
More information #ad
6. Master Lock
#ad
6 Trailer Locks Keyed Alike #6KA-3796230-37, Master Lock
#adMaster Lock #ad - If you ordered a quanity of 2, 3 etc we would automatically key them all the same. Multiple 6ka trailer lock packages can be keyed alike.For 2-5/16 couplers the better lock set is: master Lock - 6 Trailer Locks Keyed Alike #6KA-3796230-3. Latch lock doesn't fit some 2-5/16" couplers. See description below for latch lock #37 applications.
More information #ad
Total trailer security keyed alike - One key opens all six locks. See description below for latch lock #37 applications. Each lock comes with two keys, for a total of twelve keys. Three 3 high security 6230KA padlocks. Coupler lock fits 1-7/8", 2", & 2-5/16" couplers.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Height | 1 Inches |
Length | 1 Inches |
Width | 1 Inches |
Part Number | 6KA-3796230-37 |
Model | 6KA-3796230-37 |
More information #ad
7. TowWorks
#ad
3-Pack, TowWorks 79633 Keyed Alike 5/8" Trailer Hitch Lock Set with Extra Long 3-1/4" Span, Double Safety Tow Hitch Receiver Locking Pin for Class III IV Hitches with 2" and 2.5" Receivers
#adTowWorks #ad - Remark: if you need 4 or more than 4 locks keyed alike, please choose 79630 and give the quantity. 3 locks keyed alike: this item 79633 each unit package includes 3 locks with 6 keys all keyed alike. Extra long pin fits 2" and 2. 5" receivers - extra long 5/8" diameter locking hitch pin with maximum active length 3-1/4", 45901, fits class iii/iv hitches with 2" and 2.5" receivers. Spring clip cotter pin provides additional safety - a separate spring clip cotter pin provides additional safety, can use the locking pin with or without the lock mechanism. Caution: r spring clip cotter pin MUST be inserted into pin hole when use this lock.
More information #ad
Different unit package has different key codes, will be NOT keyed alike. Rubber o rings keep rattles down - rubber o rings prevent any rattling and hold the hitch pin still. Before purchase, 45902 and adjustable pintle hooks 45907, to get a great fit of the hitch lock pin. This lock does not fit curt channel style adjustable ball mounts 45900, please verify all dimensions of your hitch, 45908. This lock does not fit andersen Rapid Hitch kits and FASTWAY adjustable ball mounts. Different brand hitches may have a little different hitch tube size, please adjust O ring quantity or remove O ring to fit the receivers. Push lock design make easy to use - 6 tubular keyed alike keys making it easier to lock and unlock, 1/4 turn lock and push lock design, easy to operate, watertight dust rubber cap prevents locking mechanism internal corrosion.
Brand | TowWorks #ad |
Manufacturer | TowWorks #ad |
Part Number | 79633 |
Model | 79633 |
Warranty | One-Year warranty on lock finish, lifetime warranty on lock function. |
More information #ad
8. Master Lock
#ad
5 Trailer Locks Keyed Alike 5KA-37937-37, Master Lock
#adMaster Lock #ad - In stock with a delivery time of 1 to 5 business days. Coupler lock fits 1-7/8", 2" & 2-5/16" couplers. For 2-5/16 couplers the better lock set is: Master Lock - 5 Trailer Locks Keyed Alike 5KA-37937-3.More information #ad
Keyed alike - One key opens all five locks. Latch lock doesn't fit some 2-5/16" couplers. Total trailer Security. Each lock comes with two keys, for a total of ten keys. Simple installation and removal. See description below for latch lock #37 applications.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Part Number | 5KA-37937-37 |
Model | 5KA-37937-37 |
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. Trailer Coupler Locks - Keyed Alike
#ad
Master Lock, 3 Keyed Alike Universal Trailer Coupler Locks 379KA-3
#adTrailer Coupler Locks - Keyed Alike #ad - And is simple to install and remove. The same key opens all three locks. It also rotates less rigidity making it harder to break with sledge hammer force. Each lock weighs 2. 4 lbs. The universal trailer coupler lock fits 1-7/8in 48mm, lainson, 2in 51mm and most 2-5/16in 59mm couplers by Reese, Hammerblow, Dutton, Shelby, Putnam, Valley, Fulton, Atwood, and UFP.Rekeyable cylinder for keyed alike convenience with an advanced locking mechanism that resists picking and prying. Limited Lifetime warranty. In stock with a delivery time of 1 to 5 days.
More information #ad
This is a set of 3 keyed alike trailer coupler/tongue locks and is ideal when needing multiple locks that utilize ONLY one key. 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. Made with reinforced zinc die-cast resists rust and corrosion. These locks protects unattended trailers and guards against tow-away theft. Each lock comes with two keys, therefore you will receive a total of six keys with the purchase of this 3 pack. Few materials provide the strength and toughness of zinc alloys. Impact resistance is significantly higher than cast aluminium alloys, and grey cast iron.
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
10. Master Lock
#ad
Master Lock, 6 Trailer Locks Keyed Alike 6KA-37937-37
#adMaster Lock #ad - See description below for latch lock #37 applications. Multiple 6ka trailer lock packages can be keyed alike. If you ordered a quanity of 2, 3 etc we would automatically key them all the same. Total trailer security Keyed Alike - One key opens all six locks.More information #ad
Each lock comes with two keys, for a total of twelve keys. Coupler lock fits 1-7/8", 2" & 2-5/16" couplers. In stock with a delivery time of 1 to 5 business days. Latch lock doesn't fit some 2-5/16" couplers. For 2-5/16 couplers the better lock set is: Master Lock - 6 Trailer Locks Keyed Alike 6KA-37937-3.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Height | 1 Inches |
Length | 1 Inches |
Weight | 1 Pounds |
Width | 1 Inches |
Part Number | 6KA-37937-37 |
Model | 6KA-37937-37 |
More information #ad