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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 3,653 reviews
Condition: New
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$39.97

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At a glance

Condition
New
Model
377KA
Dimensions
5.6 x 4.3 x 2.8 in
Weight
1.83 lb
Special Features
Weather Resistant

Features 5

  • 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

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.

Specs 8

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

Frequently asked questions

This product is currently out of stock. Please check back later for shipping info.

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.

Similar Products

Top Amazon Reviews

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
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
Would buy again
Style: Trailer Hitch Lock
Works as it should
Reviewed in the United States on August 24, 2026 by DeRoyce A.
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
Fits snug in trailer tongue
Style: Trailer Hitch Lock
Works great
Reviewed in the United States on May 27, 2026 by Amazon Customer
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
As plan
Style: Trailer Hitch Lock
As illustrated
Reviewed in the United States on June 9, 2026 by Laverne Rush
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
How it works
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