1. Trailer Hitch Lock
  2. Master Lock
  3. Fits 1-1/4 Inch Hitch
  4. Fits 2 Inch Hitch
  5. Fits 1-1/4 and 2 Inch Hitch
  6. Standard Pin Lock
Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set - 1-1/4" and 2" Hitches

Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set - 1-1/4" and 2" Hitches

Item # 3794DAT
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Trailer Hitch Lock
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Master Lock Trailer Hitch Lock - 3794DAT
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Kit includes a universal coupler lock to prevent towaway theft; an adjustable latch lock to ensure that your trailer won't be unhooked from the coupler; and a trailer hitch receiver lock that fits 1-1/4" and 2" hitches. Lowest Prices for the best trailer hitch lock from Master Lock. Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set - 1-1/4" and 2" Hitches part number 3794DAT can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (52)
  • Q & A (27)
  • Photos
  • Why etrailer?

Master Lock Trailer Hitch Lock - 3794DAT

  • Fits 1-1/4 Inch Hitch
  • Fits 2 Inch Hitch
  • Fits 1-1/4 and 2 Inch Hitch
  • Master Lock
  • Standard Pin Lock
  • Keyed Alike
  • 2 Inch Span
  • Bent Pin

Kit includes a universal coupler lock to prevent towaway theft; an adjustable latch lock to ensure that your trailer won't be unhooked from the coupler; and a trailer hitch receiver lock that fits 1-1/4" and 2" hitches.


Features:

  • Towing kit includes 3 locks for ultimate security
  • Universal-fit coupler lock deters trailer theft by fitting over the coupler, preventing hookup
    • Designed for use when trailer is not in tow
    • Constructed with a laminated, riveted steel frame for strength and durability
      • Center section that fits inside coupler is finned steel - will not warp or bend
  • Coupler latch lock keeps others from releasing your trailer once it is hooked up
    • Stainless steel construction is durable and rustproof
    • Adjustable lock with 6 locking positions fits:
      • 5/8" Latch width - most standard couplers
      • 1" Latch width - most 2-5/16" ball couplers
      • 2" Latch width - most wide-latch ball couplers
  • Trailer hitch receiver lock is used in place of standard pin and clip to prevent theft of ball mount or accessories such as cargo carriers and bike racks
    • Patented, stainless steel swivel head rotates 360 degrees for easy access
      • Brass keyway with aluminum casing conveniently faces toward you, not off to the side
    • Included pins will work with both 1-1/4" and 2" hitch receivers
    • Chrome-plated steel is durable and corrosion resistant
  • All locks have integrated keyhole covers to keep out dirt and moisture
  • 3 Keyed-alike keys and convenient storage bag included


Specs:

  • Coupler lock fits most 1-7/8", 2" and 2-5/16" ball couplers including:
    • Straight lip, rolled lip and surge brake/hydraulic couplers
    • Reese, Fulton, Valley, Atwood, Shelby, Putnam, Bulldog, Dutton-Lainson and UFP couplers
  • Pin diameter of coupler latch lock: 1/4"
  • Pin diameter of receiver lock: 1/2" and 5/8"
  • Inside pin length of receiver lock (span): 2-3/4"
  • Limited lifetime warranty


Replaces 3774DAT



3794DAT Master Lock Coupler Lock, Swivel Head Receiver Lock and Coupler Latch Lock

Installation Details 3794DAT Installation instructions




Customer Reviews

Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set - 1-1/4" and 2" Hitches - 3794DAT

Average Customer Rating:  4.7 out of 5 stars   (52 Customer Reviews)

Kit includes a universal coupler lock to prevent towaway theft; an adjustable latch lock to ensure that your trailer won't be unhooked from the coupler; and a trailer hitch receiver lock that fits 1-1/4" and 2" hitches.

- 3794DAT
by:

Great set of locks. Just bought a pull-behind motorcycle trailer and wanted to secure it. This set will definitely do the job. 620239



- 3794DAT
by:

Master locks are a name brand. It is so nice to have all locks keyed the same. This decreases the chance the camper will get stolen. 628861


Comments
Very pleased. Glad to have one key for all locks.
Timmy B - 04/16/2020

73333

- 3794DAT
by:

Perhaps not the heaviest stuff available, but Masterlock gets it done and one key for all three devices is awesome. This will do the job very well. 896786



- 3794DAT
by:

Works great, good price! 825454



- 3794DAT
by:

Alex was easy to work with and knew exactly what I needed. Received the parts yesterday and everything was there. 5 stars 819762



- 3794DAT
by:

Great value for $, and I like that everything is keyed alike. 765520



- 3794DAT
by:

This is my second purchase of this kit. I have used the products to secure a small cargo trailer I haul behind my motorcycle. The locks are easy to install and provide added security. I have never been disappointed with any prodducts purchased at etrailer.com. Customer service has been excelent. I would recommend this product to anyone. 740273



- 3794DAT
by:

It worked perfectly, It took me like 30 min to install, thanks to etrailer team 715591



- 3794DAT
by:

Hopefully this will deter any would be crooks. 699945



- 3794DAT
by:

Product quality is excellent. It’s easy to use and covers multiple functions in one compact kit. 679512



- 3794DAT
by:

i love this product it has everything you need to protect your trailer and hitch from thieves 661159



- 3794DAT
by:

Received my order quickly Waiting to check it out when I get home. 660790



- 3794DAT
by:

E- trailer is a great company! Every time I’ve ordered the products are of excellent quality and the service is the best. They really go out of their way to make sure customers are impressed 633453



- 3794DAT
by:

Just received the set. Looks decently built. Easy to install. I'm very happy with purchase. 628664



- 3794DAT
by:

Nice to have a set of locking devices in one case all keyed the same. HOWEVER, Not well designed & typical Chinese poor quality. The coupling lock doesn't fit tight , its sloppy and loose. There is a short video of this same coupling lock being knocked off a trailer with one blow from a hammer. The hitch shank pin has the locking cap perpendicular to the pin. With my tow vehicle I need to get on the ground to see and insert the key. Better to have the key hole in line with the pin and insert the key horizontal so the key hole slot is visible. I wouldn't recommend this lock set. 625396



- 3794DAT
by:

Needed to protect trailer from theft and this does the job. ettrailer customer service can’t be beat!! 606013



- 3794DAT
by:

This lock set works fantastic. Easy to use and definitely worth buying. 605751



- 3794DAT
by:

Love this product! Came with a high quality case as well!! Nice to know my camper is secure while traveling! 566463



- 3794DAT
by:

I just made a significant purchase from etrailer to fit out my SUV and a new trailer to haul my Teryx UTV. Because they specialize in "everything trailers", I found their selection of options to be one of the most extensive on line ...and the pricing is very competitive too. The only place I found a full set of trailer/hitch locks with common keying was on this site. The set looks well made as I'd expect from Master Lock. Packaging was excellent , delivery was fast and I will order from them again. Not a giant web sales enterprise so very good customer service follow-up... and a phone number that a real person answers! Imagine that :) 566002



- 3794DAT
by:

Nice set! 564068



- 3794DAT
by:

Can not believe how solid the lock mechanics are. And all together this set is very affordable. Super reccomended, best of all, only one key for my ring! 515165



- 3794DAT
by:

The harness for my Pathfinder and Master lock kit were exactly as advertised. Good equipment at a reasonable price, not cheap junk. Will but from etrailer again. Thanks. 501802



- 3794DAT
by:

Product works exactly as stated. Easy to use and higher quality than I expected. etrailer.com has been excellent through every step of the process instilling confidence in that if there was a problem I know they'd handle it. etrailer.com definitely deserves consideration when there's a choice between them and others. etrailer.com earns it! 500408



- 3794DAT
by:

I've had this now for about a year, and it works very well. I like the fact that it all fits in the included case, and that all of the locking mechanisms are the same. I only have to carry one key for everything. I do think the lock for the coupler could be better, but overall I am very happy with these locks. 488041


Comments
I have been using this periodically since I purchased it, and it is still working great. I did lose one of the pins, so I might be purchasing a new one in the near future, but it isnt because the product isnt working as it is suppose to work, its because I cant find one of the pins.
James - 03/24/2019

50916

- 3794DAT
by:

This lock is easy to apply and remove. All locks are keyed alike for convenience. Works well for me on a small trailer with a two inch ball connector. 487322


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Show More Reviews

Ask the Experts about this Master Lock Trailer Hitch Lock

  • Coupler Lock for Borrowed Trailer with Surge Brakes
    Due to the unique style of coupler that you send in a picture of the hitch lock that would work the best is the Fastway coupler lock part # DT25013KA since this is a very universal style of lock that fits most couplers out there.
    view full answer...
  • Recommended Trailer Coupler Locks Keyed Alike for Multiple Trailers
    The Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set - 1-1/4" and 2" Hitches # 3794DAT does not allow for a keyed alike option at all. For a keyed alike option, I recommend the Fastway Universal Trailer Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers # DT25013KA if you just need the coupler locks. To order multiples, select keyed alike and then adjust the quantity before adding to cart. If you need coupler and trigger locks keyed alike then I recommend the Curt Trailer...
    view full answer...
  • Compatibility of Keyed Alike Extended Length Locking Hitch Pin and Trailer Coupler Locks
    The Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set - 1-1/4" and 2" Hitches # 3794DAT are keyed alike, but adding the extended length locking pins will not allow the keyed alike to also include those pins. For the 3-5/8 inch usable length, I recommend the etrailer.com Trailer Hitch Receiver Lock - Extra Long # e98881 which can be keyed alike. For the coupler locks and the hitch pin length you are seeking, you will have two different keys because you have two different manufacturers...
    view full answer...
  • Availability of Keyed Alike Padlocks and Trailer Coupler Lock Set
    The Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set - 1-1/4" and 2" Hitches # 3794DAT does not offer an option to be keyed alike to other kits or individual parts. The Master Lock Shrouded Padlock # 37DAT does have the option to key alike multiple padlocks, however there is not an option available to have them match the # 3794DAT lock set. Unfortunately for keyed alike locks, the padlocks are your only option for your slide in ramps that I can find.
    view full answer...
  • Recommended Trailer Locks for Rented U-Haul Trailers to Secure When Connected and Disconnected
    Since you are looking to lock your trailer when connected as well as when disconnected, I recommend the Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set - 1-1/4" and 2" Hitches # 3794DAT. This kit will give you a hitch pin lock for your ball mount, the trigger lock for the trailer when connected or disconnected from you vehicle, and the coupler lock to secure it when disconnected. These locks are all keyed alike for your convenience. I've attached a video to assist.
    view full answer...
  • What Size Couplers Will the Coupler Lock Fit in Universal Keyed Alike Trailer Lock Set # 3794DAT
    The coupler lock that is part of the Master Lock Universal Keyed Alike Trailer Towing Lock Set, # 3794DAT, is a universal fit coupler lock designed to fit most couplers. It fits 1-7/8 inch, 2 inch, and 2-5/16 inch couplers. I have included a video review of just the coupler lock below. The Hitch Lock fits both 1-1/4 inch and 2 inch trailer hitch receivers and the coupler latch lock will fit latches up to 2 inches wide with a 1/4 inch or less hole diameter. I have included a link below...
    view full answer...
  • Will Master Lock Coupler Lock Fit a Yoke Style Trailer Coupler
    Yes, the Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set - 1-1/4" and 2" Hitches Item # 3794DAT should still work just fine on your yoke style trailer coupler. I have included a link to a video review of this lock set for you.
    view full answer...
  • Masterlock Trailer Hitch Lock Set Recommendation for a 2014 Forest River Rockwood 21ss
    The Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set # 3794DAT should work on your 2014 Forest River Rockwood. The fact that you have a weight distribution hitch should not matter. This locking set comes with 3 different ways that it protects your towing setup. First it has a coupler lock that will deter your trailer from being stolen when not connected to your tow vehicle. Secondly, it has a coupler latch lock that keeps others from releasing your trailer once it is hooked...
    view full answer...
  • Keyed Alike Hitch and Coupler Lock Set Recommendation
    What you would want is the Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set # 3794DAT that comes with two kinds of coupler locks and two sizes of hitch pin locks that are all keyed alike. I attached a review video for you to check out as well.
    view full answer...
  • Recommended Trailer Locks Keyed Alike
    We don't have a specific page for keyed alike locks and because it is an older answer, we may have had one at that time. We do have a few lock kits that are keyed alike for coupler, latch, and hitch pin. I recommend the Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set - 1-1/4" and 2" Hitches # 3794DAT to get all the locks for a trailer keyed alike for securing the entire trailer. If you let me know what you are looking for specifically, I can be of further help.
    view full answer...
  • What Hitch Ball Sizes Can Be Secured With Coupler Lock in Master Lock Set # 3794DAT
    The Master Lock Trailer Hitch Receiver and Coupler Lock Set, part # 3794DAT, includes three locks, one for the coupler, one for the coupler latch and one for the receiver. The coupler lock does fit three sizes of hitch ball: 1-7/8, 2 and most 2-5/16-inch balls. I confirmed this with Master Lock. The receiver lock will fit both 1-1/4- and 2-inch hitch receivers. All three locks come keyed-alike for convenience and this Master Lock product carries a limited lifetime warranty.
    view full answer...
  • Can 2 Master Lock Trailer Hitch Lock Sets # 3794DAT be Keyed Alike to Each Other
    The Master Lock Trailer Hitch Receiver Lock and Coupler Set # 3794DAT referenced in your question cannot be keyed alike with another set but it will still be the best solution we have available for your two hitch receivers and couplers. This will allow you to use just a single key for each trailer lock setup. What I recommend doing is simply putting a small piece of tape on the lock and key and write an identifier on it (such as "1" and "2") so you can quickly remember which key is...
    view full answer...
  • Availability of Coupler Lock, Ball Mount Lock, and Pin Lock that are Keyed Alike
    The Masterlock trailer lock set part # 3794DAT does come with a ball mount lock, a pin lock, and a coupler lock that are all keyed alike like you are looking for.
    view full answer...
  • Can Multiple Sets of Master Lock Trailer Hitch Lock Set be Keyed Alike
    There is not an option to get two sets of the Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set # 3794DAT all keyed alike but ordering two sets of these still gets you a total of six locks - two universal coupler locks, two trailer hitch receiver locks and two coupler latch locks - that can be unlocked with just two keys. So all you really need to do is put some masking tape on the locks and keys with an identifying mark (like putting "1" on a set of locks and keys and "2"...
    view full answer...
  • Is the Hitch Lock Included in Master Lock Set # 3794DAT Long Enough for 2-1/2-Inch Hitch Receiver
    The Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set # 3794DAT that you referenced is intended for use on smaller 1-1/4-inch (Class I and Class II) and 2-inch (Class III and Class IV) hitches. The hitch lock included has a center span of 2-3/4-inches and this will be too short for 2-1/2-inch hitches. However, we do offer separate hitch locks suitable for use on your 2-1/2-inch hitch. The link I attached will let you see all such standard hitch pin locks for this size hitch....
    view full answer...
  • Can Different Styles Of Trailer Locks Be Keyed Alike?
    The Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set - 1-1/4" and 2" Hitches, # 3794DAT is the closest we come to a keyed alike option for all your trailer locks. We don't have the option of the keyed alike shackle padlock. The wheel locks can be keyed like each other, but not like the other locks so you can have multiples of the same part but you can't key the other parts the same as the wheel locks. We have the The CLUB Tire Claw XL # WI491KA and the option with the...
    view full answer...
  • Availability of Universal Keyed Alike Trailer Lock Set that Fits 2-5/16 Inch Couplers
    The Master Lock Universal Keyed Alike Trailer Towing Lock Set, # 3794DAT, is a universal fit coupler lock designed to fit most couplers. It fits 1-7/8 inch, 2 inch, and 2-5/16 inch couplers. I have included a video review of just the coupler lock below. The Hitch Lock fits both 1-1/4 inch and 2 inch trailer hitch receivers and the coupler latch lock will fit latches up to 2 inches wide with a 1/4 inch or less hole diameter. I have included a link below to a demo video of this set.
    view full answer...
  • Trailer Locks that are All Keyed Alike
    There isn't a way to order Blaylock wheel, coupler, and hitch locks keyed a like but we do have other lock sets that are keyed alike. However they do not include a wheel lock. Set # 3794DAT includes a coupler lock, latch lock, and hitch locks for both 1-1/4 and 2 inch hitches. Set # 2848DAT is similar but drops the coupler lock. If trailer theft is a problem in your area you might want to consider Linxup GPS Tracking Device # 300-AT3-S so that even if the trailer is stolen it can be...
    view full answer...
  • What is the Coupler Height of the Malone MicroSportXT Trailer # MPG460XT
    I spoke with my contact at Malone who said that the coupler height of the Malone MicroSportXT Trailer # MPG460XT is 15". When we installed the Draw-Tite Max-Frame Trailer Hitch Receiver # 76138 on a 2017 Mazda CX-5 the coupler height (from the ground to the top of the inside of the receiver) measured 13". If this is the case with your 2018 model then that means you will need a ball mount with a 2" rise. The Curt Fusion Ball Mount # C45155 is a great option as it has a 2-1/4" rise (the...
    view full answer...
  • Recommended Coupler And Hitch Lock Combination Keyed Alike
    For your sleeve-lock coupler, I recommend the Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set - 1-1/4" and 2" Hitches # 3794DAT. This will give you the hitch lock, the coupler ball lock and the pin lock. This kit is the best kit that has all three components keyed alike. If you want a better fit, you may need to move to a system with different keys. This Master Lock Set is very nice, but if you want the best coupler lock, I recommend you get something like the Blaylock...
    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...
  • Keyed Alike Lock Set for a 2017 TAB Trailer
    I recommend Master Lock set # 3794DAT. It comes with various styles of locks that are all keyed the same so you won't have to worry about different keys for different locks. Three locks are included: hitch lock (for 1-1/4 or 2 inch hitches), latch lock, and coupler lock. I have linked a video review of this lock set.
    view full answer...
  • Recommended Tow Setup for 2014 Acura MDX and Jayco Trailer
    For your 2014 Acura MDX, I recommend starting with the Curt Trailer Hitch Receiver # C13146, which is an easy bolt on installation. Then for 4-way wiring, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118628 which plugs into your Acura MDX's junction box, which is located in your rear cargo area, behind the driver's-side trim panel in the spare tire compartment. Once connected, insert the fuse in the junction box. I've attached a video to assist. Then...
    view full answer...
  • Recommendation For Locks To Prevent Theft Of A Camper Trailer
    If you are wanting to lock the trailer to your 2002 Isuzu Trooper and you have a 2 inch hitch receiver, I would recommend the etrailer Trailer Hitch Receiver And Coupler Lockset, part # e99039. This is a set of locks that will lock the ball mount to your tow vehicles 2 inch hitch and also lock the trailers coupler to the hitch ball. Both of the locks can be keyed alike, so only one key is needed for both locks. Locking your trailer at both connections will add time when somebody is...
    view full answer...
  • Coupler Lock For a 2014 Rockwood Roo 21ss
    I looked up pics of the coupler on the 201 Rockwood Roo 21 SS and that the style of coupler is compatible with the part # DT25013KA that you referenced. You will just need to measure the width of the lip on your coupler to be certain. The # DT25013KA is compatible with couplers that have lips up to 4-1/2 inches in width. If yours measures less than that, as I suspect it will, it should work very well. Since you are looking for a hitch lock and coupler locks I would recommend you go...
    view full answer...
  • Can Master Lock Heavy Duty Coupler Lock Be Keyed Alike with a Master Lock Receiver Lock
    I have a solution for you, but the Master Lock Coupler Lock sets like the # 3784DAT do not give us the ability to offer keyed alike locks, nor do they have a replacement lock core that could be swapped out to match your existing locks. If you wanted all 3 items (coupler lock, latch lock and locking hitch pin) keyed alike you would need to use the # 3794DAT. If you wanted to go with the Heavy Duty # 3784DAT you could add a receiver lock that would not be keyed alike with the # 1480DAT. I've...
    view full answer...
  • Ball Mount, Ball, Sway Control, Locks, Spare Tire for Hallmark Trailer and 2006 Toyota Highlander
    First, to determine the correct ball mount you can follow the help article I have linked. It is important to measure ahead of time to get a ball mount with the right rise or drop needed to tow the trailer level. Or you can go with an adjustable ball mount such as # MT70067 which is great for more than one trailer or if you might be towing something different in the future. It has a maximum rise of 8 inches and maximum drop of 10 inches. For a 2 inch ball that is compatible with this...
    view full answer...

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Info for this part was:

Video Edited:
Zack K
Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Updated by:
Adele M
Installed by:
Cole B

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