Master Lock 1-7/8", 2", and 2-5/16" Trailer Coupler Lock - Nickel Plated Zinc

Master Lock 1-7/8", 2", and 2-5/16" Trailer Coupler Lock - Nickel Plated Zinc

Item # 377DAT

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Retail:$47.68

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Trailer Coupler Locks

Shipping Weight: 4 lbs

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377DAT - Fits 1-7/8 Inch Ball,Fits 2 Inch Ball,Fits 2-5/16 Inch Ball Master Lock Trailer Coupler Locks
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Nickel-plated die-cast zinc trailer coupler lock guards against trailer towaway theft. Fits most 1-7/8", 2", and 2-5/16" ball diameters. Lowest Prices for the best trailer coupler locks from Master Lock. Master Lock 1-7/8", 2", and 2-5/16" Trailer Coupler Lock - Nickel Plated Zinc part number 377DAT can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (118)
  • Q & A (44)
  • Videos (2)
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  • Why etrailer?

Master Lock Trailer Coupler Locks - 377DAT

  • Fits 1-7/8 Inch Ball
  • Fits 2 Inch Ball
  • Fits 2-5/16 Inch Ball
  • Surround Lock
  • Master Lock
  • Keyed Unique
  • Universal Application Lock

Nickel-plated die-cast zinc trailer coupler lock guards against trailer towaway theft. Fits most 1-7/8", 2", and 2-5/16" ball diameters.


Features:

  • Coupler lock deters theft of your trailer
  • Fits most 1-7/8", 2", and 2-5/16" ball diameters of the following coupler brands:
    • Reese, Fulton, Valley, Atwood, Putnam, Marvel, Ideal, Acme, Dutton-Lainson
  • Advanced locking mechanism resists picking and prying
  • Easy to install and remove
  • Nickel-plated die-cast zinc resists rust and corrosion
  • Lifetime guarantee


377DAT Master Lock 1-7/8", 2", and 2-5/16" Trailer Coupler Lock - Nickel Plated Diecast Zinc







Video of Master Lock 1-7/8", 2", and 2-5/16" Trailer Coupler Lock - Nickel Plated Zinc


Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Master Lock Trailer Coupler Lock Review

Dustin: Hey, Dustin here at etrailer.com. Today we've got the master lock trailer coupler lock to take a look at with you.This lock is designed to fit in your coupler ball socket, preventing anyone from hooking up to your trailer and taking off with it. It has a heavy duty nickel plating. Since it's going to be outside, most likely. It's going to help prevent rust and corrosion. It has a heavy duty metal construction, making it difficult to pry off or remove from your trailer without the included keys.

Two keys are included. When I take it off here, you'll be able to see what really makes it work. There's this ball here inside that fits up inside. It's going to help you secure most couplers. I've got 2-5/16ths coupler here on a travel trailer.

Or the 2 inch coupler here on our John boat. Or even the inch and 7/8ths coupler here on our little dump trailer.Now if your coupler has a larger lift like our trailer here it might not be a good fit. To install it you'll just put the ball in place, you can latch down your coupler and the you can engage the lock. Clip it in place, there's nowhere to really pry or press or pull to get it off. Now sometimes people will secure their couplers by placing a padlock with a pin hole coupler latch.

That can be an effective deterrent, but padlocks can easily be cut or pried out, whereas this isn't going anywhere.


Customer Reviews

Master Lock 1-7/8", 2", and 2-5/16" Trailer Coupler Lock - Nickel Plated Zinc - 377DAT

Average Customer Rating:  4.8 out of 5 stars   (118 Customer Reviews)

Nickel-plated die-cast zinc trailer coupler lock guards against trailer towaway theft. Fits most 1-7/8", 2", and 2-5/16" ball diameters.

- 377DAT
by:

I am extremely pleased with quality of this item and the price was excellent. Thankyou 469504



- 377DAT
by:

Great service and fast shipping. Product came exactly as advertised. 519263



- 377DAT
by:

I ordered 5 different articles, I received them exactly at the agreed time, everything perfectly as shown and promoted on the webside, excellent service and it appears to be of very good quality. 506720



- 377DAT
by:

Product was exactlly what I ordered and expected. I purchased 2 locks and requested they be "keyed alike". I received the locks (that worked great, and were keyed alike) very quickly. I got several emails from real people that let me know the status of the shipping. This is the first time I have purchased a product from etrailer.com, but it will not be the last. The cost was 25% cheaper than retail. I could not find the product on retailers shelves. I found the product, saved money, and got it fast with etrailer.com 66300



- 377DAT
by:

Solidly built but will not work on a Jayco travel trailer with the rib in the middle. 551025


Comments

If youd care to send in a detailed photo of your trailer coupler, wed be happy to help you find a compatible coupler lock.

-- Mike L - 08/08/2018

42064

- 377DAT
by:

Very robust product other than the ball is sized to fit a 1 7/8" coupler as well as a 2" coupler so the fit is a bit loose when installed in a 2" coupler. Would be a better product if it was available for the exact sized coupler that a person needed. 429884



- 377DAT
by:

They can be broken very easily. it's not the best product around. 597752


Comments

The truth is, just about any lock can be pretty easily defeated by somebody who knows what theyre doing. A lock such as this will provide a certain level of deterrence, which hopefully will encourage the thief to move on to easier pickings. The best practice is to use a coupler lock such as this one, along with a secondary method such as chaining the trailer to a nearby immovable object or using a wheel lock. The more deterrence you can provide, the better the chances that all but the most determined thief will move on elsewhere.

-- Mike L - 01/16/2019

48618

- 377DAT
by:

We purchased this about a year ago and so far there is no sign of rust or corrosion. I can't really rate the durability because thankfully, no one has tried to steal our trailer. But the build looks strong and hopefully it will hold up for many years. Overall we're glad we went with Master Lock. 346438



- 377DAT
by:

I couldn't find a trailer lock to work on my car hauler anywhere in Denver, Colorado. etrailer had not only one but 5 that fit the bill. I love a choice. It got here in 2 days using regular shipping and fit like a glove. 9513



- 377DAT
by:

Great Product. So easy to install and remove. Turn the key, retract the shaft away from the ball to allow enough room for the ball to fit up inside the coupler, then move the shaft back towards the ball to take up the extra space and turn key to lock it! Multiple locking positions so it may well work with a larger or smaller ball hitch. Great Product!! I use it on a 2" coupler on my tandem axle Easy Loader trailer holding a 20' North River fishing boat... safe and secure now! 596730



- 377DAT
by:

Picture of lock. 26495



- 377DAT
by:

Product appears to be made with quality materials and appears to work effectively to stop or deter theft. It was heavier than I expected which is a good thing, meaning it should stop and make a theft think about how much trouble it would be. I feel it should withstand attempts at theft and remain intact thus stopping someone from taking the trailer. 378840



- 377DAT
by:

This hitch lock is strong and well made. It's also easy to install and secure; just what I was looking for. 138937


Comments

This is a quality product, it still works great.

CanDo - 07/03/2015

13017

- 377DAT
by:

Really pleased with this lock, with them keyed alike is convenient, used on 2 of my trailers and they seem to be very secure. Would recommend these. 663466



- 377DAT
by:

Great products and customer service. 498202



- 377DAT
by:

I got this coupler lock by Master because it's the one that the big box stores use on their trailers but they don't stock it in their stores. It seems to be very rugged and functional. If it wasn't, I'm sure that the big box stores wouldn't be using it instead of what they sell. 490949



- 377DAT
by:

Looks great, works great, gives piece of mind that someone won’t hook up and drive off with your trailer 520161



- 377DAT
by:

works great, fits well. Shipping was incredibly fast! Outstanding product support, Bill was great 226239


Comments

Very durable, holding up well to the outside elements. Great product highly recommend

Jessie J - 09/17/2016

21046

- 377DAT
by:

...nothing will keep a determined thief from stealing your stuff, but there are ways to make them look elsewhere for a target. The trailer coupler lock from Master makes this point. This thing feels bomb-proof & it's easy to use. My 13' Zodiac RIB on a trailer could be easy pickings if it wasn't for this. Money well spent... 104959



- 377DAT
by:

This is the most simple and strongly made lock I have found. I think this is a product that I can trust to protect my property with. Very pleased. The U-bolt kit is exactly what I need. Namar 729210



- 377DAT
by:

Outstanding product. I have 4 of these. After a year... all still working as they should. 723204



- 377DAT
by:

Fits and works great 722222



- 377DAT
by:

Both this transaction and previous purchases over the past years have been excellent in terms of inventory, product information available, speed in shipping my orders and product pricing. 719324



- 377DAT
by:

Nice locker 713990



- 377DAT
by:

Have not tried the product yet but the Customer Service part was very efficient and knowledgeable. Giving 4stars for customer assistance 705670



- 377DAT
by:

This lock feels like you couldn’t shoot it off . .. Noticed one on a neighbor’s cargo wagon and was SOLD. Real easy to use and quite good looking at a surprising price.. 699304



- 377DAT
by:

Only have had the chance to test it out. Seems to be working fine. 699051



- 377DAT
by:

Very satisfied. Would recommend. 694077



- 377DAT
by:

Great placed order from product works as they have put in the specs they always get it to you on time 677068



- 377DAT
by:

Product is exactly as we expected. 675368



- 377DAT
by:

Works perfect. 673488



- 377DAT
by:

Heavy duty , well made good value . Fits multiple size trailer tongues 670103



- 377DAT
by:

Added protection for tool and merchandise while in use ,this product will be an great addition for your enclosed trailer especially during times when it small quarters and not attached to the truck. Lastly I would like to thank Etrailer and their staff for an awesome job in customer service. Thank Antonio Bunkley Sr 661323



- 377DAT
by:

At first look it seems very stout and sturdy, quite heavy, guess time will tell. 661275



- 377DAT
by:

I ordered the product because my nephew has one and I needed it for my new Jewelry Mobile Boutique this is awesome in which deters theft I couldn't have bought a better product anywhere else. 660890



- 377DAT
by:

Great heavy duty trailer locks for our trailer lot. Got all 30 keyed alike so we dont have to carry our giant key bin with us every time we need a trailer. 659862



- 377DAT
by:

No qualms about this product. Used for over a year and it's served me well. 653056



- 377DAT
by:

Always happy with my purchases and deli vers 647427



- 377DAT
by:

Worked great on 1-7/8" and 2-5/16" 646482



- 377DAT
by:

Have this lock on our flatbed trailer we mainly use to haul hay. When parked it's back by the horses on a side dirt road out of site from the house. We use it to keep honest people honest. 644463



- 377DAT
by:

I have only had an opportunity to use the trailer 3 times since purchasing the lock but, it still operates like the day I installed it and no one has attempted to steal my trailer. Wish I had bought this for my first trailer that was stolen. It only had a locking pin thru the hitch lock. 633979



- 377DAT
by:

Easy lock to use. No signs of rust or corrosion after 1 year. 623134



- 377DAT
by:

Long-term use will confirm its ability to stand up to useage and weather but so far - so good. I like the "mass" of the lock and I have seen these used by the place where I bought my trailer so if they think it's a a good product then that is fine with me. 616579



- 377DAT
by:

I just received my lock and It looks to be durable and long lasting. I'm very pleased with it can't wait to put it on my trailer. Thanks, Jamie 608509



- 377DAT
by:

I am grateful for the opportunity to share my experience w/ etrailer regarding my new lock for my utility trailer! First of all you need to understand that I am a grumpy ol' senior adult who is hard to please! The entire process -- from ordering the product to installing it on my trailer -- has been fantastic! Everything was done in a professional manner and I am extremely pleased w/ the lock! I highly recommend doing business w/ etrailer and I highly recommend this lock. On a scale of 1 - 10, I would give etrailer an 11! 599488



- 377DAT
by:

Again this item was shipped promptly and arrived in great condition. It worked as advertised. I use it all the time with no problem. 597204



- 377DAT
by:

Easy to use. Smooth hook up and easy to get on and off. Seems very sturdy too. 588587



- 377DAT
by:

This product offers great security with a snug fit and substantial weight of the locking mechanism. 587944



- 377DAT
by:

Great item at a great price. 586501



- 377DAT
by:

Have a lot full of trailers and use these locks. Heavy duty, good quality, and saves time having them keyed the same. 586460


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Ask the Experts about this Master Lock Trailer Coupler Locks

Do you have a question about this Trailer Coupler Lock?


  • Is the Blaylock EZ Lock Coupler Lock Part BLTL-38 Easy To Cut Through
  • The Blaylock EZ Lock Coupler Lock part # BLTL-38 is indeed made of aluminum which is a softer metal. However, if a would be thief has any sort of powered saw on hand they are going to get though most locks no problem and that's just the said reality of it unfortunately. If you prefer a coupler lock made of steel then you can use the Master Lock Trailer Coupler Lock part # 377DAT or the Fastway Universal Trailer Coupler Lock part # DT25013KA which would indeed be more difficult to cut though....
    view full answer...

  • Trailer Coupler Lock for 2019 Jayco Jay Flight 28BHBE
  • Looks like you have a standard underslung thumb latch coupler like the part # CA-5335-B. The Master Lock coupler lock part # 377DAT would fit this and work well.
    view full answer...

  • Will the Master Lock Coupler Lock # ML389DAT Fit a 4 Wide Trailer Coupler
  • We do have some options for you but the Master Lock Trailer Coupler Lock # ML389DAT that you referenced has a max coupler width of 3-1/4" so your coupler will be a little too big for it. For a coupler lock that can accommodate a 4" wide coupler we have the following: Tow Ready Gorilla Guard - # 63227 Fastway Universal Coupler Lock - # DT25013KA Master Lock Coupler Lock - # 377DAT etraiiler.com Coupler Lock - # e98895 Out of those options I recommend going with the etrailer lock....
    view full answer...

  • Coupler Lock for Trailer Coupler with Rolled Lip
  • You are absolutely right that the rolled lip on your trailer's coupler will prevent using some types of locks but we do have a solution for you. If your coupler measures no more than 4-1/2-inches wide (including the lip) you can use the Fastway Universal Trailer Coupler Lock # DT25013KA. If it is wider then instead you can use Master Lock # 377DAT. The coupler lip appears too tall to work with lock # ML389DAT.
    view full answer...

  • Recommended Coupler Lock for UFP A-60 Surge Coupler
  • For a UFP A-60 hydraulic actuator/coupler I suggest Fastway coupler lock # DT25013 or Master Lock # 377DAT but the style of lock # ML389DAT will not work with your coupler.
    view full answer...

  • Coupler Lock Recommendation for Bulldog Collar Lok Coupler
  • The Bulldog couplers are Collar Lok style which we have solutions for, but the MasterLock part # 377DAT is not the one you need. Instead the Fastway part # DT25013KA would be what you need.
    view full answer...

  • Coupler Lock for a 2019 Jayco Jay Flight SLX 242BHS
  • According to my research the Master Lock 1-7/8", 2", and 2-5/16" Trailer Coupler Lock # 377DAT will fit the coupler on your 2019 Jayco Jay Flight SLX 242BHS. I have attached a photo of this coupler lock on a trailer coupler that I believe is the same type that is on your Jay Flight. I have also attached a review video for you to check out.
    view full answer...

  • Keyed Alike Coupler and Hitch Lock Recommendation
  • The Master Lock 1-7/8" and 2" Trailer Coupler Lock # 377DAT can be keyed alike meaning that if you ordered several we could make sure that all of the ones you receive would use the same key. The Master Lock Hitch Receiver # 1481DAT does not have a keyed alike option. This product would ship with it's own key design. Based on what you are looking to do I think your best option would be the Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set # 3794DAT. This comes with two coupler...
    view full answer...

  • Recommended Keyed Alike Trailer Coupler Locks For Multiple Trailer Application
  • For your keyed alike trailer couplers, I recommend the Fastway Universal Trailer Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers, # DT25013KA. This lock secures your coupler from the top and bottom. It is a noticeable theft deterant and it has a tube key lock cylinder to provide better security. It has an anti-drill pin and bolt blocked locking system prevents prying open the lock. Fastway has been shown to work on the most different styles of couplers. Other options for keyed alike...
    view full answer...

  • Coupler Lock Recommendation for Wide Lip Coupler, Pro Series Adjustable-Channel Coupler
  • Thank you for the photo of your trailer coupler. Because of the wide lip on the coupler, like # PSA200S0303 that you referenced, I recommend the Master Lock 1-7/8 and 2 Inch Trailer Coupler Lock, Nickel Plated Zinc # 377DAT because the design of this lock offers a number of theft deterrents. Tbhis lock does not have a bar that goes up and over the coupler, so the width of the coupler doesn't affect this lock. This lock will work very well in conjunction with the padlock you have through...
    view full answer...

  • Recommendation for a Coupler Lock Compatible to the Demco Channel Tongue Trailer Coupler
  • For your Demco Channel Tongue Trailer Coupler for 2 Inch ball, # DM12717, I recommend the Master Lock 1-7/8, 2, and 2-5/16 Inch Trailer coupler Lock, # 377DAT. Unlike the Fastway Universal Trailer Coupler Lock, like # DT25013, the Master Lock coupler lock will fit up into the trailer coupler and uses a sliding lock that secures over the Demco coupler lip. The Master Lock trailer coupler lock is nickel-plated die-cast zinc that will resist rust and corrosion.
    view full answer...

  • Locking Pin for Brake Actuator Coupler
  • You have a couple of good options. You can use our etrailer.com Coupler Lock, part # e98888, through the latching mechanism on the top of your coupler. This has a wide width so it will clear the sides. You could also use Master Lock 1-7/8" and 2" Trailer Coupler Lock, part # 377DAT, which attaches where the trailer hitch ball would go.
    view full answer...

  • Can the Master Lock Trailer Coupler Lock # 377DAT be Rekeyed
  • The Master Lock Coupler Lock, # 377DAT, is not rekeyable. Master Lock does not offer replacement lock cores for this particular lock. If you know the key number that was stamped on the original keys, you can order replacement keys using the Replacement Key for Master Lock Coupler Locks, # MLK1. If you do not have the original keys and the lock is stuck on your trailer, you can drill out the lock core to remove the lock, but you would need a new coupler lock to secure the trailer. If...
    view full answer...

  • Trailer Coupler and Wheel Locks to Deter Trailer Theft
  • master Lock trailer coupler lock # ML389DAT would be a bit more secure than lock # 377DAT in my opinion because it would be a little more difficult to pry off. When it comes to locks the best solution is redundancy. In other words more than one lock. You may want to consider also adding a wheel lock such as # RA-25 or # WI490. If a thief sees a coupler lock and a wheel lock they are likely going to move on to an easier target.
    view full answer...

  • Coupler Lock Options for Haulmark 24 Foot Trailer
  • There are three common trailer ball sizes, 1-7/8, 2 inch or 2-5/16 inch. Less common is the 50mm. The trailer ball size your trailer needs should be stamped into the metal of your coupler somewhere. A trailer coupler lock like the # DT25013KA from Fastway fits most standard, latch or trigger style couplers. Master Lock also offers some nice coupler locks like # 377DAT which fits all 3 sizes of trailer balls. Another option would be a lock like # e98886 that passes through the...
    view full answer...

  • Recommended Keyed Alike Coupler Locks
  • For your keyed alike trailer couplers, I recommend the Fastway Universal Trailer Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers, # DT25013KA. This lock secures your coupler from the top and bottom. It is a noticeable theft deterant and it has a tube key lock cylinder to provide better security. It has an anti-drill pin and bolt blocked locking system prevents prying open the lock. Other options for keyed alike couplers lockes are the Blaylock EZ Lock Trailer Coupler Lock for 2"...
    view full answer...

  • Replacement Key for Master Lock Coupler Lock
  • If you have a MasterLock Coupler Lock like # 377DAT the replacement key is # MLK1. You will need the key number which is stamped on the original keys, it is not stamped on the lock. Unfortunately, if you do not have that number you will need to replace the lock. If the lock is currently locked on your trailer you can drill out the lock cores to remove it.
    view full answer...

  • Coupler Lock for RAM, Bulldog Style Gooseneck Couplers
  • The Master Lock Trailer Coupler Lock # 377DAT is designed to fit trailer couplers that are towed with a rear hitch, not a gooseneck hitch. For a gooseneck coupler lock, you would want # BLTL-55-40D for RAM gooseneck couplers or # BLTL-50-40D for Bulldog/Stallion/Superior/T.E.M. couplers.
    view full answer...

  • What is the Master Lock 1-7/8 and 2 inch Trailer Coupler Lock Part # 377DAT Constructed Of
  • The Master Lock Trailer Coupler Lock is constructed of steel that is plated to resist rust and corrosion and weighs about 4 pounds. The 2 black accents on the sides of the ball are plastic inserts but have no bearing on the sturdiness or locking ability of the lock. The shackle that secures the ball portion of the lock into the coupler is 1-1/2 inches wide by 7/8 inch thick and would be difficult to destroy or cut. We have a good selection of coupler locks and the best selling locks...
    view full answer...

  • Trailer Coupler Surround Lock Option for Wallace Forge 20K Coupler
  • I have a solution that may work for you, but after looking at photos of your coupler, the lack of a pronounced lip around the coupler means many of the style coupler locks you are looking for will not work correctly on your trailer. For a coupler lock that will secure inside the ball socket of the coupler, I really like the Master Lock Trailer Coupler Lock # 377DAT. My family uses this lock on our travel trailer to keep it secure. This lock has a large, flat plate to cover the bottom...
    view full answer...

  • Tips for Unlocking a MasterLock Coupler Lock that Won't Release from a Trailer
  • I would try hitting the locking mechanism with some WD-40 or a similar spray lubricant. Most likely if you get some lubricant on the portion of the lock that moves you will get it to brake free. If there is any tension on the trigger portion of the lock that could cause it to bind up and not release either. Also, make sure you have the position of the lock all the way in the unlock position so that it will release.
    view full answer...

  • Will the Master Lock Trailer Coupler # 377DAT Fit a Goose Neck Trailer
  • I have provided a link to the coupler locks that we currently carry that are compatible with gooseneck trailers. The Master Lock trailer coupler lock that you referenced is intended to be used on 1-7/8 and 2 inch trailer ball couplers. If your gooseneck trailer has a 2 inch ball this might work, but most likely it will not work. Additionally, the attachment style of this coupler lock may not be compatible with your gooseneck trailer coupler. Typically gooseneck trailers have a...
    view full answer...

  • Troubleshooting Trailer Coupler Lock by MasterLock Where Key Wont Turn
  • You might try directing WD40 or a lube like the # L10444 into the key slot and then working the key in and out a few times. It sounds like you have some sticky tumblers which the lube would help free up. Try that and let me know if it works.
    view full answer...

  • Replacement Key for Master Lock Trailer Coupler Lock
  • We do have replacement keys available for your Master Lock Trailer Coupler Lock # 377DAT with part # MLK1, however you will need to know the key number that you are needing. If you can find this number, you will simply enter it into the textbox below the product information for the correct replacement. If you cannot locate the key number, unfortunately there is no way to determine what key you will need for the lock. The Master Lock Coupler Locks are not rekeyable so your only option...
    view full answer...

  • Could a Master Lock 1-7/8" and 2" Trailer Coupler Lock # 377DAT Be Ground Off by a Grinder
  • The Master Lock 1-7/8" and 2" Trailer Coupler Lock # 377DAT that you referenced is constructed of steel, which will make it harder to cut off then an aluminum coupler lock. But if a prepared thief had a battery powered grinder like you with a diamond cutting wheel it would only be a matter of time before he could grind the lock off. You have to consider that the odds of a thief having a grinder like this are pretty slim. Plus the fact that the amount of noise created by grinding on this...
    view full answer...

  • Availability of Keyed Alike Coupler Lock, Hitch Lock and Padlock
  • Unfortunately, we can't get MasterLock products Like the # 377DAT keyed alike with different locks, but I might have an option to key everything else to your vehicle ignition key. BOLT offers hitch locks, coupler latch locks and padlocks that can be keyed alike to certain vehicle ignition keys. For instance, if you had a 2013 Chevy Silverado, you could use the BOLT # BL7018446 hitch lock, the # BL7018518 padlock or even the # BL5922987 locking tailgate handle. I don't have anything...
    view full answer...

  • Will the Master Lock Trailer Coupler Lock # 377DAT Fit on a 2012 Keystone Cougar Trailer
  • I did a little online research and found that Master Lock Trailer Coupler Lock, # 377DAT, should work well on the coupler on your 2012 Keystone Cougar X-Lite 30RLS trailer. I posted a photo of a coupler similar to the one I saw on the same model trailer as yours on the internet for you to check. Compare this coupler to yours so you can be sure this is the style coupler that is on your trailer. If so the # 377DAT coupler lock will work great.
    view full answer...

  • Installation and Operation of the MasterLock Coupler Lock # 377DAT
  • To install this Master Lock Coupler Lock # 377DAT onto your coupler you will need to have your coupler in the unlocked position so that the ball portion of the lock can slide up in to the coupler. Once slid on you will push the shackle back and it is locked. It is perfectly normal that your coupler has to be put into the unlocked position before it will accept the # 377DAT. As long as you have a coupler that has is designed for a 1-7/8 inch or 2 inch ball and it has a lip around the...
    view full answer...

  • Are all the Keys of the Master Lock Coupler Lock # 377DAT the Same
  • Master Lock is a well-known lock brand that would not use the same key for every one of the Master Lock 1-7/8", 2", and 2-5/16" Trailer Coupler Locks # 377DAT. If they all had the same key we'd be able to offer you this with a "keyed alike" option meaning that if you ordered multiples we could make sure they all used same key. Since that's not possible that also indicates that the keys are unique and not all the same.
    view full answer...

  • Recommendadtion for a Secure Keyed Alike Trailer Coupler Lock
  • The Trailer Coupler Lock - Gorilla Guard for 2 inch Couplers, item # 63228, is not available keyed alike. We do have two other coupler locks that are very secure and can be keyed alike. Fastway Universal Trailer Coupler Lock # DT25013KA (for locks that are keyed alike, click on drop-down menu) Master Lock 1-7/8 inch and 2 inch Trailer Coupler Lock, item # 377DAT (also available keyed alike) Both of these couplers are quality products for the small price difference I would choose...
    view full answer...


Do you have a question about this Trailer Coupler Lock?




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    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Satisfaction Guarantee
    Need to return an item? No problem. Please read our Returns Policy for more information.

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