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Master Lock 3774DAT Key Alike Lock Set
List Price: $62.96

Our Price: $39.99

You Save: $22.97 (36%)


Product Description

Keep your trailer safe from thieves three different ways with this lock set from Master Lock. This keyed-alike set protects boat trailers or any 2-inch receiver trailer, from tow-away theft. The set includes a coupler lock that fits 1-7/8- and 2-inch ball diameters, a receiver hitch lock for 2-inch Class III / IV tubes, and a coupler latch lock that fits most standard latches. The triple protection secures the trailer in-tow and when it's just sitting unattended. Plus, all the locks are keyed alike, so you only have one key to keep track of. Premium quality, with solid brass cylinder and case, hardened steel shackle, the set features a pick-resistant 4-pin tumbler for optimal security. An internal O-ring and water-tight cap keeps out water and dirt for years of smooth performance. The set comes with a 10-inch carry case. --Brian D. Olson

What's in the Box
Lock set, Cordura storage pack

  • 3-piece lock set for trailer-hitch security
  • Includes coupler lock, coupler latch lock, and receiver lock
  • Fits 1-7/8- and 2-inch balls, 2-inch Class III / IV tubes, and most standard latches
  • One key opens all 3 locks for convenience
  • Includes Cordura storage pack

Customer Reviews:

  • Great product ...

    It does the job.
    Good looking, strong and safe.
    What else could I say?
    Would recommend....more info
  • Useful set
    I have found two of the three locks in this set useful. The hitch lock did not fit on my trailer. Thus this only gets four stars....more info
  • Works Great!
    I guess the only way I will know for sure that the locks are bad is if the trailer is stolen (which hasn't happended yet), but that said, all the locks work great. There is a big advantage to 1 key for all the locks.

    A minor point, but the hitch bar to hitch receiver lock barely fit my particular hitch bar and hitch receiver, it did take a little fiddling. This isn't the fault of the lock, but just a warning that you may need to try the lock on either side of the receiver to get the lock to actually lock....more info
    The best price I could find, in my city the lock set was about $70.00 and to try to buy each piece individually was close to 75.00. This was a great deal and free shipping to boot. I recieved the package in about four days.

    The only locking system to have if you own a Uility Trailer....more info
  • Convenient and only one key!
    I used this set on my travel trailer the last two weeks and it was great. Especially to only have to worry about one key. The receiver lock is solid and comes with a nice rubber cover for the key hole. The hitch lock is a bit of overkill, but no one's rolling away with my trailer when it's on :) I defintely would recomend this set over others even thoug the pin lock is a little bit tough to get onto a bigger trailer hitches....more info
  • Great little Lock Set
    I bought this to lock the ball hitch of may tow dolly and it is really nice. Comes with a ball hitch lock, Locking Hitch Pin, and Locking tounge pin. All keyed the same and has a nice little carrying kit....more info
  • Not Great
    Two of the three components (locks) would not work in my applocation. The hitch receiver Lock was too short and the hitch losk (for trailer hich lock lever) was also too short. Could not use two out of three components....more info
  • Receiver lock not LONG enough
    The pin of the receiver lock is not long enough. It's about 1/4" short. Th4, this receiver lock is useless for me....more info
  • Great Product, but not exactly as pictured.
    This is a great product. Very well constructed. I was able to use all the components, but the latch lock was not the one pictured on the site. Which is why I only gave it 4 stars. I brought this misleading info to the attention to Amazon, but they are yet to fix it. Master Lock's site should have the right photo for the 3774DAT....more info
  • trailer lock kit
    Great product. It is really nice and convenient to have all three locks use the same key. Also, it is very convenient to have all three locks stored in one case, which can save you time looking for your different locks....more info
  • Master Lock Key alike set
    Great product! It looks sharp and strong. I will buy another for my other trailer and vehicle. Thanks for making a great product at a great price....more info
  • Latch Lock is Different
    The latch lock pictured is not the one you get in the box. It is the sub $9.00 lock here:Master Lock Adjustable Coupler Latch Lock, Stainless Steel #2847DATSC The one in the picture looks like the ~$19.99 lock here: Masterlock 1475DAT Lshkl Brbll Lk 7/8"" " or the ~$14.00 one here: Coupler Latch Lock By Master Lock Company
    I would have given this product the five stars if it had come with the pictured items. A bit of a bait and switch......more info