Master Lock Trigger Style Coupler Lock for 1-7/8" and 2" Couplers

Master Lock Trigger Style Coupler Lock for 1-7/8" and 2" Couplers

Item # 605DAT

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Master Lock Trailer Coupler Locks - 605DAT
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  • Latch Lock
  • Master Lock
  • Keyed Unique
  • Universal Application Lock
  • 3/4 Inch Span
  • Brass
Lowest Prices for the best trailer coupler locks from Master Lock. Master Lock Trigger Style Coupler Lock for 1-7/8" and 2" Couplers part number 605DAT can be ordered online at etrailer.com or call 800-298-8924 for expert service.


  • All Info
  • Reviews (80)
  • Q & A (9)
  • Videos (2)
  • Photos
  • Why etrailer?

Master Lock Trailer Coupler Locks - 605DAT


Master Lock Trigger Lock for 1-7/8" and 2" Couplers

  • 1/4" Shackle diameter
  • 11/16" Shackle length
  • Protected case-hardened steel shackle resists cutting and sawing
  • Built-in anti-sawing pin for maximum protection
  • Solid brass case for corrosion resistance
  • Precision pin tumbler mechanism for superior pick resistance

Dimension

605DAT Master Lock Trigger Style Coupler Lock for 1-7/8" and 2" Couplers







Video of Master Lock Trigger Style Coupler Lock for 1-7/8" and 2" Couplers


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




Video Transcript for Master Lock Trigger Syler Coupler Lock Review

Today we're going to take a look at the MasterLock, Trailer style Coupler Lock, part number 605DAT. As you can see, it's a really nice, small, compact design which will make it extremely difficult to cut off or tamper with. The body of the lock is surrounded by brass with a case hardened interior, along with a case hardened pin. The pin itself is 1/4 inch in diameter, and the width from the inside of the pin hole is 3/4 of an inch. Now, our lock will come with the lock and body itself, along with 2 keys. Key will unlock the pin. As you can see, when you pull it back, I'm going to go ahead and take the key out of the way, then we've got the hardened pin that will go into the hardened body that fits right down over the pre-drilled hole in the trailer coupler, not allowing it to be unlocked. It will help to prevent trailer theft. To take it off we simply take on of our 2 keys, line it up with the tumbler, unlocks the pin, and we can remove it.

We're ready to head on down the road. That will do it for the look at our MasterLock Trailer Coupler Lock, part number 605DAT, on our trailer. .


Customer Reviews

Master Lock Trigger Style Coupler Lock for 1-7/8" and 2" Couplers - 605DAT

Average Customer Rating:  4.7 out of 5 stars   (80 Customer Reviews)


- 605DAT
by:

Good item. 501900



- 605DAT
by:

Excellent coupler lock!!! Pin pops out easily and re-locks with ease. made of solid brass and a steel pin. A good deterrent. 145324



- 605DAT
by:

Great simple product. I no longer worry about my lock being cut now. Great service from earlier. What a pleasant shopping experience. 128636



- 605DAT
by:

Goo Product 225759


Comments

everything was as I ordered it and I was very satisfied

Tm D - 09/21/2016

21120

- 605DAT
by:

love this for the fact of not wanting to get my trailer stolen. God help me if I were to lose a key!! 652703



- 605DAT
by:

Excellent lock. The hasp on the receiver covers 95% of the bolt so there is nothing to cut. Feels well made and heavy for its size. Good theft deterrent. 75381



- 605DAT
by:

The lock, in terms of a device, appears to be well designed and produced. The problem, from the perspective of a purchaser, is the amount of conflicting and somewhat irrelevant technical information provided by Master Lock about the product. Documentation focuses on the application, specifically the corresponding trailer hitch ball size (1 7/8" and 2" couplers). Unfortunately, this same documentation then outlines physical dimensions of the lock itself stating a 1" wide opening in the lock and 7/8" depth from the center of the pin to the lowest extent of the lock opening - designed to extend over the coupler trigger mechanism. I researched additional technical documents for part number 605DAT locks, including that of the manufacturer, and found references to applicable couplers as large as 2 5/16" - again referring to the same physical dimensions of the lock opening (width 1" depth 7/8"). After discussions with etrailer customer support (Thanks Lisa D.) who then talked directly with Master Lock (who seemed oddly unable to validate the physical dimensions of the lock), and given the lock is only $10, I decided to buy the lock from etrailer . The lock arrived, and unfortunately, the lock's opening is not 1", it is 3/4". The point here is that Master Lock should review their technical documentation and provide accurate dimensions of the lock opening which will allow potential customers to make corresponding measurements of their coupler trigger mechanisms to inform their purchase decisions independent of coupler ball size. As a final note, it appears that Master Lock does not manufacture a trigger lock device with a 1" wide opening to fit 1" wide coupler triggers. I am considering modifying the lock which I purchased in an attempt to achieve a 1" wide opening by machining the widest section of the lock body. It appears that there might be enough pin depth to accomplish this. Yes, this will compromise the strength of the lock, but this device is only going to deter "honest" thieves in any case:), 473822



- 605DAT
by:

The lock is advertised as fitting a 1 5/8 and 2” coupler. That’s why I ordered one. The package is clearly marked as fitting a 3/4” coupler. Does not fit my trailer. Not impressed 450107


Comments

Karen,Thank you for your review. The length of the shackle pin is 3/4. If the trigger on your coupler is wider than 3/4 this will not work.

-- Heather A - 11/11/2017

30705

- 605DAT
by:

It was very stiff and the key didn't work well when it was new. After a year of use and being left in the Florida rain to do it's job, it still works. The key works better now but the lock still has stiffness to it and is difficult to manipulate. There is a spot of brown rust at the key hole which is strange for a lock that is made of brass and has internals that should be brass or impervious to oxidation. Still after a year outside in Florida I am impressed that it works so well. 608675


Comments

Try using powdered graphite in the lock opening. Graphite is one of the best solutions Ive found for a dry lubricant for locks that wont attract dirt and grime like a spray lubricant would.

-- Mike L - 02/27/2019

49947

- 605DAT
by:

Unfortunately there wasn't enough information on this product on the website for me to determine ahead of time that the pin in this lock was too large to fit through the hole in my trailer coupler. I assumed it was standard and it is not. Now it is out of the package and I cannot return it and I cannot use it. Was a waste of money. 614802


Comments

As mentioned on the product description page, the locks shackle pin is 1/4 inch in diameter. A photo showing all the lock dimensions is also shown.

-- Mike L - 03/29/2019

51187

- 605DAT
by:

Looks to be solidly made.Does not look to be easy to break off 673410



- 605DAT
by:

It sat outside all winter and opened easily in spring but had a small rust spot on the shaft. Still works fine after a shot of oil was like new. 646746



- 605DAT
by:

Feels like a good solid lock and fits p erfectly. 644920



- 605DAT
by:

works as described... 619577



- 605DAT
by:

Great lock, fits firmly and leaves no space for bolt cutters. 604835



- 605DAT
by:

product was as described in catalog. completely satisfied. 573253



- 605DAT
by:

The gap for the lever could be wider, it wouldn't fit my trailer. Be sure you measure before you buy. 556634



- 605DAT
by:

As advertised. Don't know how much abuse it will stand up to but time will tell. 551151



- 605DAT
by:

Works great. Would buy again. 545824



- 605DAT
by:

Compact yet awesome security and piece of mind. 520848



- 605DAT
by:

This same lock was on my father-n-laws bout when he past away and we had to get metal grinder to get it off. This is a very safe lock to put on any trailer. 512368



- 605DAT
by:

Even better quality than I expected. 500419



- 605DAT
by:

After a year lock is holding up very well with no issues. A simple good deterrent. 487410



- 605DAT
by:

Love this lock ,does the job and there’s no way a bolt cutter can cut lock! 485168



- 605DAT
by:

Bought this lock for my utility trailer. Shipping was on time and product is exactly what I wanted. Happy buyer 481887



- 605DAT
by:

Solid Master lock unit; delivered a day early too! 473925



- 605DAT
by:

This product didn't actually work for me because it did not fit the coupler on my trailer. The build quality is excellent but since I can't use it I can't comment on the durability of the lock. If you choose to go with this lock, take some time to measure the coupler on your trailer and look at the inside dimensions of this lock (they are shown in a photo in the description - 1") to ensure that you can use this before you buy. I can use this on a utility trailer so I'll keep it. Otherwise, typical Master Lock quality. 472322



- 605DAT
by:

Everything arrived in a timely fashion. The sales rep. (Cathy) was very helpful and easy to work with. 471158



- 605DAT
by:

Great product, looks just like the picture, well made, easy to use. I bought to secure the camper hitch when not attached to Jeep. Well worth the price. 462646



- 605DAT
by:

Nice little lock to keep the "casual" thief at bay. Inexpensive, also! 460867



- 605DAT
by:

Fit and it locks, Awesome that is what I needed... 457504



- 605DAT
by:

Is a perfect fit for my utility trailer. 455646



- 605DAT
by:

Simple, secure, great price. What else could a man ask for. 443221



- 605DAT
by:

Great coupler lock. Works easily and is compact. It does what it is designed to do. 434230



- 605DAT
by:

This lock is about as good as it gets, would take some time to get it off. 419260



- 605DAT
by:

This lock is still performing flawlessly. Great product !! etrailer is a great vendor to by accessories from. Great products and customer service !! 381448


Comments

After 2 years the lock is still working as expected. No issues at all !!

Scott R - 05/17/2018

38567

- 605DAT
by:

Simple, effective and affordable boat trailer lock that I use at boat landings and on my boat trailer when it’s stored in my driveway. I like the fact that the main body of the lock is brass so it doesn't rust and the chromed shackle is protected by the trailer latch so it's not vulnerable to bolt cutters. 369964



- 605DAT
by:

Worked as advertised great service as a lways 369650



- 605DAT
by:

Bought this to deter theft. Small, but a visible deterrent. No issues with fit. Well made. 368502



- 605DAT
by:

Perfect! Never take it off and it functions as good as day one. 347945



- 605DAT
by:

etrailer customer assistance is outstanding. I call in my orders and always receive top notch service and assistance. Fast shipping is the cherry on top! 345779



- 605DAT
by:

Nice Lock, never freezes up, always wor ks. 341291


Comments

I have purchased these two locks to secure my trailer in towing and in theft protection. Fortunately they both have worked well as I have not had my trailer stolen...and it has not come loose from the coupling. Since I live and use the trailer primarily in Michigan, I have found that the Trigger Style Coupler lock to be influence by ice and water. That is, the lock is susceptible to freezing water in the lock and the water from the road and rain washes the lubricant away and makes the lock sticky. It works as intended but would be improved if water proofed.The other lock goes into the ball space and prevents a smaller ball from being hitched to the locked trailer. It fits well and is better waterproofed, but doesnt get used when the trailer is attached to the truck and therefore doesnt get the road dirt, water and ice into it.

Jeff - 02/13/2018

34664

Unfortunately, there are dishonest folks out there. The most you can expect from any lock is to act as a deterrent, or to keep honest people honest. The sad fact is that if a thief wants your stuff bad enough, no lock will stop them. The idea is to slow them down, and hopefully make them move on to easier pickings. Sometimes using a combination of locking products provides the best deterrence, such as a coupler lock like the # 605DAT you purchased along with a wheel lock like the Wheel Club, part # WI490
The Wheel Club - Tire and Wheel Lock
$96.47
.

-- Mike L - 2/13/2018


- 605DAT
by:

Simple and easy to use. I sprayed a little lube into the mechanism to keep it moving and resist moisture. Design works well to ensure the lock sits well on the coupler. Much better than a simple pad lock. 333266



- 605DAT
by:

My utility trailer needed lock. This purpose made hitch lock fits and looks great. It's easy to remove and install. 331981



- 605DAT
by:

It works as designed, not much more you can say about a lock 326772



- 605DAT
by:

Good product... need to grease it since it wants to bind. 318444



- 605DAT
by:

I use these locks on my drift boat trailers. They work great and are saw proof. Wouldn't buy anything else. 317931



- 605DAT
by:

good 317467



- 605DAT
by:

This is a good lock had one before and it got lost. 306896



- 605DAT
by:

Received this lock along with a trailer hitch lock. Works on my trailer. Arrived as expected and would order again. 292390


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Show More Reviews

Ask the Experts about this Master Lock Trailer Coupler Locks

Do you have a question about this Trailer Coupler Lock?


  • Lock Recommendation to Fit Trigger Latch of Fulton Coupler
  • For the Fulton Fast-Lok Coupler # F346000301 you referenced you would want the Master Lock Trigger Style Coupler Lock # 605DAT. Check out the picture I attached that shows it locking tightly to the trigger of a coupler. The pin diameter is 1/4 inch and is 11/16 inches long.
    view full answer...

  • Coupler Lock for Trigger Latch Coupler that has 3/4 inch Span
  • We have the MasterLock Trigger Style Coupler Lock part # 605DAT which has a span of 3/4 inches like you said you need that would work well. You are correct and the tighter the latch opening is to the trigger latch of the coupler the harder it would be for a thief to get in there and cut the shackle.
    view full answer...

  • Recommended Trailer Coupler and Trigger Lock
  • If the Fastway Universal Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers - Key 312, # FA86-0015-312, coupler is not snug, it may not be installed correctly. I've attached a video review for you to check out and make sure. If it is installed correctly and still doesn't meet your needs, then I recommend a different style of coupler lock like the Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers, # ML389DAT. You may also be interested in a trigger lock like the Master...
    view full answer...

  • Availability of Keyed-Alike Coupler Locks
  • There are coupler locks that can be keyed-alike, but the Master Lock Trigger Style Coupler Lock # 605DAT that you referenced cannot. Check out the Trailer Coupler Lock # 7690. You can order these keyed-alike if you select that feature before you hit add to cart. I attached a link to all the keyed-alike coupler locks we offer also.
    view full answer...

  • Can an Order for Multiple Tow Ready Locks Be Keyed the Same
  • Many of the lock products we offer can be ordered in multiples that are keyed alike and some of the Tow Ready brand locks are among these. The link at right will take you to our main page for locks that can be keyed alike, such as DeadBolt # 28012. You can use the filters on the linked page to select the type of locks you need - gooseneck, lunette ring, standard coupler, etc. Once you select the product you want you can select the Keyed Alike option from the drop-down menu above the...
    view full answer...

  • Recommended Trailer Coupler Lock For 5" Wide Coupler
  • The surround-type trailer coupler locks can only fit couplers that have a maximum width of 4-1/2". For a 5" wide coupler you will need to use a latch lock such as the Master Lock Trigger Style Coupler Lock for 1-7/8" and 2" Couplers # 605DAT or Trailer Coupler Lock - Deadbolt Style 2" Span # 7691
    view full answer...

  • Coupler Lock for Fulton Fas-Lok Trailer Coupler for 2 Inch Balls
  • The pin hole is 1/4 inch which is a standard size for most trailer couplers. You can use lock # 605DAT which is designed for 1-7/8 and 2 inch couplers. I have included a link to a video review of this lock for you.
    view full answer...

  • Should Adding a Padlock to a Yoke Style Coupler Keep the Coupler from Coming Off of the Tow Vehicle
  • I only had one photo of yours come through so it is a little hard to tell but you should be able to add your padlock style coupler lock, like the Master Lock # 605DAT, to keep your coupler from opening. Attached is a review video of the discontinued Atwood Yoke style coupler AT80072 where you can see that the padlock would attach to. I'm guessing you've already tried attaching the lock and you are still able to open up the coupler with the trailer coupled to your tow vehicle? If that...
    view full answer...

  • Recommended Lock for Demco Hijacker UMS Double Pivot 5th Wheel Hitch for Ford Super Duty Prep Pucks
  • The Demco Hijacker UMS Double Pivot 5th Wheel Hitch - Single Jaw - Ford Super Duty Prep Package - 21K # DM8550033 secures to the pucks of your Ford with turning handles that are "locked" in place by pins that are 3-3/4 inches long and 3/8 inch diameter. We have had customers that choose to increase the security of their hitch by using a padlock like the Master Lock Stainless Steel Padlock with Shielded Shackle - 3/8" Diameter Shackle # ML40D or Master Lock Trigger Style Coupler Lock for...
    view full answer...


Do you have a question about this Trailer Coupler Lock?




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Info for this part was:

Expert Research:
John H
Photos by:
Amber A
Photos by:
Zach O
Updated by:
Sarah W
Updated by:
Hannah L

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