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$$60.74 () Includes selected options. Includes initial monthly payment and selected options. Details
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Return policy: Returnable until Jan 31, 2023
For the 2022 holiday season, returnable items purchased between October 11 and December 25, 2022 can be returned until January 31, 2023.
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Master Lock 377KA Universal Coupler Lock

4.4 out of 5 stars 3,837 ratings

$60.74

Enhance your purchase

  • Designed to provide safety and security for the coupler
  • Fits 1-7/8 inches, 2 inches and most 2-5/16 inches; trailer couplers
  • Chrome plated
  • Easy to install; Master Carton Qty: 4
  • Corrosion resistant
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Frequently bought together

  • Master Lock 377KA Universal Coupler Lock
  • +
  • Deluxe Coupler/Door Latch Lock (fits couplers to 3/4" Span)
  • +
  • Trimax THP2XL Keyed Alike Trailer Door Lock, (Pack of 2)
Total price:
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Product description

Master Lock Universal Coupler Lock is designed to provide safety and security for the coupler. This lock fits 1 to 0.87 inch and 2 inch couplers. It is made from strong material and is finished with chrome plating. This lock is easy to install and is corrosion resistance.

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Master Lock 377KA Universal Coupler Lock


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Customer reviews

4.4 out of 5 stars
4.4 out of 5
3,837 global ratings

Top reviews from Canada

Reviewed in Canada 🇨🇦 on July 14, 2022
Size : Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer CouplersVerified Purchase
Reviewed in Canada 🇨🇦 on November 4, 2022
Size : Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer CouplersVerified Purchase
Reviewed in Canada 🇨🇦 on June 15, 2022
Size : 2-5/16-Inch CouplersVerified Purchase
Reviewed in Canada 🇨🇦 on February 21, 2022
Size : Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer CouplersVerified Purchase
Reviewed in Canada 🇨🇦 on March 18, 2022
Size : Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer CouplersVerified Purchase
Reviewed in Canada 🇨🇦 on July 28, 2021
Size : Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer CouplersVerified Purchase
Reviewed in Canada 🇨🇦 on July 2, 2019
Size : Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer CouplersVerified Purchase
Reviewed in Canada 🇨🇦 on September 8, 2021
Size : 2-5/16-Inch CouplersVerified Purchase

Top reviews from other countries

E H
5.0 out of 5 stars Buen producto y puntualidad en la entrega
Reviewed in Mexico 🇲🇽 on February 5, 2020
Size : Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer CouplersVerified Purchase
Craig R.
1.0 out of 5 stars Robbed Twice!
Reviewed in the United States 🇺🇸 on April 11, 2021
Size : 2-5/16-Inch CouplersVerified Purchase
Customer image
1.0 out of 5 stars Robbed Twice!
Reviewed in the United States 🇺🇸 on April 11, 2021
I have written VERY few reviews, but this one NEEDED to be written.

The second time I was robbed was when some scum stole our 20-foot enclosed trailer, worth about $10,000. The trailer belonged to our business but was being used to hold personal belonging while our new house was being worked on. Total value of stolen items is about $20,000. One of our business neighbors was able to find security video of the trailer being stolen but there was not enough detail to ID the vehicle used or the thieves.

The first time I was robbed was when Master Lock sold this piece of crap as a “lock”. It’s funny that their motto is “a brand you can trust.” Unfortunately, I did trust that brand. Master Lock should be sued for selling this as a lock, it does not even make a good paper weight. The specifications on Amazon say this thing weighs 3.6 pounds, 3.6 pounds! Maybe a package of 4 weigh 3.6 pounds! This thing is made from pot metal, and weighs less than 1 pound…

Anyway, what the video that our neighbor had showed was that the scum that stole the trailer took less time breaking this “lock” off the trailer than it takes to install it! Well, Master Lock does say that it is “easy to install and remove”. The thieves wrapped a cable around the coupler “lock” and an expensive Master Lock pad lock (used to lock the coupler latch) and their truck, moved the truck forward (no lurching, just moved it forward) and both locks just popped off.

Now, look at the photos of the coupler “lock” this thing fell a part right at the ball, look at the material it’s made from, cheap cast metal with a void in it. While you’re at it, the photos show corrosion, Master Lock claims that it “resists rust and corrosion” and while the trailer was parked on the San Francisco bay, it was only 5 months old and nothing else, including bare metal that the plumbers down the block have outside, rusted.

I originally purchased this lock because we had one for years, but that one is made from solid (real) steel, not this pot metal junk. Stupid me, I didn’t notice the difference when this lock arrived. I will not buy anything Master Lock again, including American Lock which is owned by Master Lock.

Thanks to a previous review by someone else (which I can no longer find), who’s recommendations I confirmed with a lot of my own research, I have replaced the crappy Master Lock “locks” with the following items; while these are expensive, the quality is obvious, and they cost a LOT less than the insurance deductible:

AMPLOCK U-BRP2516 RV/Trailer Coupler Lock, 2 5/16 coupler (real steel - weighs 12lbs!!) - $265

AMPLOCK U-HLP58 Hitch Lock (for receiver tube 2'' X 2'') - $99

Abloy PL330 Brass Padlock for the coupler latch and chains - $82

When parked I will either take the wheels off (all 4 of them) or, for over night parking (when in use), I will wrap a KRYPTONITE cable (the thickest one that will fit in the wheels) through the holes in the wheels and lock them with either the Abloy PL330 or the ABUS 92/80 ($69).

The theory with all the locks is to slow them down, then if they are really determined –

GPS trackers for trailers and all expensive equipment. I’m going with “Find it Now” brand, for our motorcycles, trucks, trailers and equipment [due to compact size for the motorcycles]. If we did not have the motorcycles to protect [we’re a motorcycle business] I would go with “One Step GPS”.

Master Lock “…provides peace of mind from a brand you can trust.” Not anymore!
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30 people found this helpful
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David C Reimers
1.0 out of 5 stars this is an amazing and AWESOMELY built lock
Reviewed in the United States 🇺🇸 on February 22, 2017
Size : Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer CouplersVerified Purchase
329 people found this helpful
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Cian F
1.0 out of 5 stars 5 cent key replacement!
Reviewed in the United States 🇺🇸 on July 31, 2018
Size : Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer CouplersVerified Purchase
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1.0 out of 5 stars 5 cent key replacement!
Reviewed in the United States 🇺🇸 on July 31, 2018
If you mess up like me and somehow loose both keys to this (I have no idea how), fear not! There is a good key replacement for less than 5 cents! Mind you I've NEVER tried to pick a lock with a paper clip before.. I bent two paper clips one for tension and one as a "feeler" pick, and I had this lock undone in less than 2 minutes, outside in the rain.

Great if you loose your keys like me. Horrible if you actually want to secure a trailer. I imagine anyone with ANY skill or practice in picking locks, and a real lock pick set, would've had this done in less then 20 seconds.

Please don't waste your money on this, even as a placebo, it's insanely expensive. Tape a sign on the trailer that asks the theif nicely not to, would probably be more effective.
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38 people found this helpful
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Daryl Frost
1.0 out of 5 stars DID NOT HAVE A OPT. TO GIVE IT 0 STARS ALL THE LOCKS ARE KEYED THE SAME.
Reviewed in the United States 🇺🇸 on February 27, 2018
Size : Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer CouplersVerified Purchase
38 people found this helpful
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