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

Looks and feels like a good quality lock with a positive latch in the locked position. Replaces another, cheaper coupler lock, feel better about having this one on the trailer. 1284638

I purchased the Master trigger lock as a secondary backup to a trailer coupler lock. I will be using both to protect my pontoon boat and trailer. I purchased the master lock because of the master lock name. 1138844

by: Earl11/04/2021

What can I say, it's a Master lock. It fits snugly on the latch of my trailer coupler, allowing me to secure it in the open or closed position as needed. After a year in the Florida sun and rain, it still looks and operates the same as when I purchased it. 1194742

by: Rafer12/01/2021

Lock seemed cool but I never used it because it didn't fit my trailer. 1215068

This lock is designed to fit couplers ranging from 1.875 inches to 2 inches.

-- Thomas M - 12/20/2021

So far, so good! I got what I payed for! 1017207

so far so good...

Wayne - 04/21/2022

by: Richard06/15/2022

Fine,works well 1313290

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

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

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

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

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

by: Mark06/07/2021

This is a great product. I am on my 5th or 6th lock of this exact design. Not because it is of bad quality but because I have had a lot of trailers. When ever I sold a trailer I always gave the new owner the lock. I had one sit for 3 or 4 years on an unused trailer. Put in the key and it unlocked with out a problem A little WD40 and it was as good as new. 1058040

by: Hamilton02/27/2019

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

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

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

Click to Enlarge

Great products at a reasonable price 1212294

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

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

by: Jasper05/18/2021

Unfortunately this didn’t fit my trailer coupler. Which I didn’t notice until after I had ordered it, my fault. I gave it to my father in law and he loves it. 1040559

Well built, sturdy, works perfectly with my trailer. 69773

Click to Enlarge

I have been buying trailering parts from E trailer for a few years and have never been disappointed, great name brand products at a great price, shipping is fast, and order is always complete... 2" trailer ball with a 1 1/4" shank for a class 5 hitch is impossible to find at local retailers... Thanks to E Trailer, no clunky receiver adaptors, just the right ball mount for the receiver, and the right ball for the ball mount.. Thank you very much... 207425

Great product and great service. 1251786

Great service 1251374

Placed order on line early evening, Patrick called me half an hour later to let me know that the tires were out of stock. He told me the tire would be available in a few weeks, or he pointed out an alternative tire. Since I wasn't in a rush I told him I'd wait till they were in. Received them a little sooner then expected, well packed in a box. Most companies would have just placed the order on back-order, some not telling you. Tires look good on well galvanized rims. Would definitely do business with etrailer again. Thank, John 117520

by: Dan A.04/20/2017

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

by: Scott R05/17/2017

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

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

Scott R - 05/17/2018

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

by: CDL01/17/2017

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