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  • Master Lock 37KA Keyed Alike Armored Trailer Lock with Shackle Guard
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Master Lock 37KA Keyed Alike Armored Trailer Lock with Shackle Guard

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List Price: $16.24
Price: $13.43 & FREE Shipping on orders over $35. Details
You Save: $2.81 (17%)
In Stock.
Ships from and sold by Amazon.com.
  • Locks are all keyed alike and it is ideal for securing trailers, cables and chains
  • Armored hardened steel shackle defies cutting
  • 1.562 inch laminated steel body for superior strength
  • 4-pin tumbler cylinder prevents picking
  • Shackle guard protects against bolt cutters and hacksaws
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$13.43 & FREE Shipping on orders over $35. Details In Stock. Ships from and sold by Amazon.com.

Frequently Bought Together

Master Lock 37KA Keyed Alike Armored Trailer Lock with Shackle Guard + Camco 44414 Wheel Chock - Pack of 2
Price for both: $21.70

Buy the selected items together

Product Information

Technical Details
BrandMaster Lock
Item Weight10.4 ounces
Product Dimensions3.9 x 2.2 x 1.3 inches
Item model number37KA
Manufacturer Part Number37KA
  
Additional Information
ASINB001QK1X5O
Best Sellers Rank #1,886 in Automotive (See top 100)
Shipping Weight10.4 ounces (View shipping rates and policies)
Domestic Shipping Item can be shipped within U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First AvailableJanuary 23, 2008
  
Warranty & Support
Warranty, Parts: Parts
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Product Description

Master Lock Keyed Alike Armored Trailer Lock With Shackle Guard is ideal for securing trailers, cables and chains. The shackle with guard fits openings 0.5 inch in diameter or larger. The shackle lock is removable to accommodate openings 0.281 inch in diameter. The opening in the center of the lock measures 0.437 inch wide and 0.937 inch tall and has a 1.562 inch laminated steel body for superior strength. It also features a 4-pin tumbler cylinder that helps prevent picking. This shackle guard protects against bolt cutters and hacksaws.

Customer Questions & Answers

Customer Reviews

3.9 out of 5 stars

Most Helpful Customer Reviews

39 of 39 people found the following review helpful By Derek Mitchell on June 24, 2014
Verified Purchase
I bought 2 locks, they came keyed the same.
They fit both my trailers no probem, see attached pictures.

As another member said they seem to have extra weak points because of the multi point design (hence the 4 stars) but they are snug enough to the trailer where it would be impossible to get a crowbar in there.
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23 of 23 people found the following review helpful By halluv3 on April 28, 2014
Verified Purchase
this is a very good lock. i decided to purchase it even though some people reviewed that it didnt fit the size hole on their hitch... news flash... this lock comes with a sheath on the lock pin for larger mountings. all you have to do is slide it off for the normal size hole. by the way, the reason i got this one is because my other one has lasted over 20 years already!
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10 of 10 people found the following review helpful By Nick Savage on December 22, 2012
Verified Purchase
I'm sure I just have the illusion of safety, but I can tell you that this lock fits snugly on my cargo trailer when locked and doesn't expose enough to easily use bolt cutters to get the lock off.
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8 of 8 people found the following review helpful By joe leinenger on July 3, 2013
Verified Purchase
had one for 25 years worked great till i lost it the new one i just got has a better chrome finish
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6 of 6 people found the following review helpful By son nguyen on July 21, 2014
Verified Purchase
Nice lock for the extra protection. If its too loose in your trailer lock, put some washers in there to prevent prying. Wont defeat other methods of attacks but slowsdown bolt cutters.
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5 of 5 people found the following review helpful By N. White on May 14, 2014
Verified Purchase
Several of the reviews say how the shaft is too thick, however there is a sheath that you can slide off - very easy with plyers.

However, for my trailer hitch, the hole in the hitch latch for the lock is too close to the hitch ball socket, so the shackle guard gets in the way, therefore it does not work for its intended use for my particular RV trailer.

But, it works just fine for locking other things such as storage shed, etc.
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1 of 1 people found the following review helpful By Eric Rosenberry on August 17, 2014
Verified Purchase
This lock is working well for me so far, though I did have to remove the outer sleeve to get it to fit through my Sea-Doo trailer hitch lock hole. Once that sleeve is removed the remaining pin is fairly small and could be broken off easier naturally. It also is a longer pin than needed for my application so I fear someone could get a pair of bolt cutters down in there to cut the lock pin. All of that being said, the lock works as advertised and provides some level of deterrent to running off with my trailer when I am out on the water. ;-) I understand exactly why they made the design decisions that they did. (P.S. I have not tried it, but I am guessing these Master locks would be pretty trivial to pick or use a bump key on)
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1 of 1 people found the following review helpful By Andres on May 17, 2015
Verified Purchase
I purchased this lock for a small kayak trailer. I drove around locally and I was not able to find a lock like this. As usual amazon carries exactly what I need. It works as advertised. As the pictures attached show there a small sleeve that can be used to fit different trailers. I ended up buying a couple of washers to cover small gaps, just for added security. Keys are sturdy and it comes with 2.
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Want to discover more products? Check out these pages to see more: trailer hitches and accessories, trailer coupler locks, trailer coupler locks

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Master Lock 37KA Keyed Alike Armored Trailer Lock with Shackle Guard
This item: Master Lock 37KA Keyed Alike Armored Trailer Lock with Shackle Guard
Price: $13.43
Ships from and sold by Amazon.com