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Your cart is empty.The Master Lock 379ATPY features a universal trailer coupler lock, designed to fit 1-7/8 in. (48 mm), 2 in. (51 mm) and most 2-5/16 in. (59 mm) couplers. The advanced locking mechanism provides resistance to picking and prying. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.
JRC MSU_FAN
2025-09-04 18:29:22
I’m very pleased with this. Appears to be difficult to defeat. Easy to install. Lock works well. Nice appearance. Material is quality and fits well. Easy to remove.
honey extractor
2025-07-11 12:36:14
Use this on 25/16†ball hitch. Went on easily. Tried wiggling it off. Stayed on well and solid
Loren
2025-07-02 11:04:14
I needed some locks for heavy-duty trailers that use 2-5/16" Bulldog couplers. I had previously had bad luck with Guardian locks, which were more expensive, not as well made, and not backed up by the manufacturer.These Master Lock coupler locks not only appear to be much better than the Guardian locks, they come with a limited lifetime warranty from Master.This lock fits the 2-5/16" Bulldog/Hammerblow couplers (in spite of the fact that this size is not listed) and is a very reasonable price. Fortunately, I cannot say how well they resist thieves' attempts to steal the trailer, but they will certainly provide a substantial deterrent.I bought mine in October 2008 and they have a chrome finish that appears to be excellent. Despite being in the weather all winter in Indiana, they still look and operate as if they were brand new. It looks like Master Lock has switched to the pictured painted or powdercoated finish instead of the chrome plating. I don't know how well the new finish will protect the mechanism compared to my chrome ones, but keep in mind that Master Lock offers a lifetime warranty, which covers operation but not finish.I have never had any trouble installing the lock to the coupler, but I agree that it can be a bit loose when locked. The lock attaches via a number of notches and it's unlikely that you'll find one that is exactly tight. There's no ratchet to help you with this, so you must squeeze the locking mechanism as you turn the key. It's more trouble to write about it than to do it. In spite of the slight looseness, I think someone would have a tough time getting it off the coupler.Regarding sticking tumblers or locking mechanism, I find that I must lubricate all my locks, including these, occasionally.Amazon also sells Master Lock model 379DAT, which has a rubberized coating. I bought one of those recently. It seems to be a bit looser on the coupler, I think because of the coating. Unless you are concerned about the possibility of the coupler's paint chipping from metal-to-metal contact, I would recommend the model 379ATPY over the 379DAT. See Painter Bill's review, dated July 11, 2011.Both of these locks are highly recommended, but especially the 379ATPY.
Jonathan Oliver
2025-06-07 17:14:50
This is a decent lock for my boat trailer. Smooth operation, not the most secure but pretty good.
Terry W. Oldham
2025-05-23 15:08:51
Great product.Well designed.
Robert Steele
2025-05-20 20:50:42
Easy to attach and remove. Works well and very reasonable.
Henry L Durham Jr
2025-03-26 13:55:07
Worked great.
Tanner
2025-03-17 18:06:59
Seems like a good lock. A bit worried that hitting it with a hammer you could brake it into a million pieces. It’s a cast metal that worries me a bit. I’m hopeful that Master lock has done their homework for quality and not just a bit of deterrent of to slow someone down an extra1 minute before they rip off my trailer. Easy to use and should fit almost any trailer that hooks up in a rear bumper trailer hitch. Will not work on a fifth wheel style if you are wondering.
Customer
2025-03-10 19:26:21
Worked as stated and just the appearance is a good deterrent to theives.
DBB
2025-02-02 16:11:21
Great product
ANTONIO ASUNSOLO
2025-01-29 10:50:53
Muy buen artÃculo. Se ajusta bien sin importar el tamaño y grosor de la almendra de recepción.
James R.
2024-12-27 20:54:22
Fit and works for my class III hitch.
Dan
2024-12-16 12:36:35
Feels good and strong, but doesn’t fit on couplings with an anti rattle bolt.
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