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Master Lock

Master Lock Trailer Hitch Lock, Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer Couplers, Weather Resistant Automotive Hitch Lock with Keys, 377KA

  • Based on 3,651 reviews
Condition: New
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Availability: Only 1 left in stock, order soon!
Fulfilled by Amazon
Arrives Aug 12 – Aug 16
Order within 7 hours and 27 minutes
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Features

  • Fits 1-7/8 inch (48mm), 2 inch (51mm) and most 2-5/16 inch (59mm) trailer couplers
  • Advanced locking mechanism resists picking and prying
  • Easy to install and remove
  • Aluminum diecast finish resists rust and corrosion
  • Limited Lifetime Warranty provides peace of mind from a brand you can trust.

Description

The Master Lock No. 377KA features a trailer coupler lock, designed to fit 1-7/8 inch (48mm), 2 inch (51mm) and most 2-5/16 inch (59mm) trailer couplers. The advanced locking mechanism provides resistance to picking and prying. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.

Manufacturer: ‎Master Lock


Brand: ‎Master Lock


Model: ‎Trailer Hitch Lock


Item Weight: ‎1.83 pounds


Product Dimensions: ‎5.6 x 4.3 x 2.8 inches


Item model number: ‎377KA


Manufacturer Part Number: ‎377KA


Special Features: ‎Weather Resistant


Date First Available: October 3, 2008


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Aug 12 – Aug 16

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Great product
Style: Trailer Hitch Lock
I have used this for several years now and highly recommend. Great, especially for storage.
Reviewed in the United States on April 21, 2026 by CJ4
    • Good Lock !
Style: Trailer Hitch Lock
first lock came without keys. Company sent a new one out, had it in a couple days. No problems , all working good.
Reviewed in the United States on March 24, 2026 by Christopher O Doane
    • It fit and locked the way it should.
Style: Trailer Hitch Lock
It fit great. I had one like this before and I am very happy with this one.
Reviewed in the United States on June 5, 2026 by John M. Blask
    • Extra Security
Style: Trailer Hitch Lock
This turns upside down and can not be broken off.
Reviewed in the United States on May 23, 2026 by R A Ranger
    • Fits snug in trailer tongue
Style: Trailer Hitch Lock
Works great
Reviewed in the United States on May 27, 2026 by Amazon Customer
    • As plan
Style: Trailer Hitch Lock
As illustrated
Reviewed in the United States on June 9, 2026 by Laverne Rush
    • Easy to use, secure and very sturdy.
Style: Trailer Hitch Lock
Bought my first one 15 years ago and it still works great, you can push it shut in a ratching fashion without even having the key in it. Fits trailers with 1 7/8" , 2" and 2 5/16" ball socket. Bought another for a second trailer. The design would make it difficult to pry it saw off. Much better than the u-bolt over the top design which only locks on one side and could be sawed quickly with a saws all of pryed in the non-locking side. For extra security use one of these and a lock through the latch and it isn't going anywhere. ... show more
Reviewed in the United States on October 28, 2019 by Richard Williams
    • Works great
Style: Trailer Hitch Lock
I use this as just part of my trailer security while parked in the garage. I lock the tongue with a coupler lock and then lock the chains so they can't be used to be stolen alongside this lock. This product works great. Used with a verity of security mechanisms is better then this alone. All in all you are just making it look more sophisticated then the other trailer securities around you so the thief goes after the easier targets. This product does just that. Stainless steel shine makes this look a lot better then yellow locks. easy to lock and unlock. its heavy and solid feel works well for my trailer when not tied to my truck and all its security measures. ... show more
Reviewed in the United States on May 9, 2017 by Trevor M.

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