Master Lock 5th Wheel Trailer King Pin Lock




Code: 2999DAT


12 reviews

Retail:$20.98

Our Price: $19.72


Quantity: 


Product Specs:

Trailer Locks

Coupler Lock


King Pin Lock

Keyed Unique

Steel

Master Lock


Easy-to-use collar locks around your trailer's king pin so that it cannot be hooked up to anyone else's hitch. Bright red color provides visible theft deterrent, and the chrome-plated, deadbolt-style lock can double as a receiver lock.

Video of Master Lock 5th Wheel Trailer King Pin Lock


Customer Reviews

Master Lock 5th Wheel Trailer King Pin Lock - 2999DAT

Average Customer Rating:  4.6 out of 5 stars   (12 Customer Reviews)

Easy-to-use collar locks around your trailer's king pin so that it cannot be hooked up to anyone else's hitch. Bright red color provides visible theft deterrent, and the chrome-plated, deadbolt-style lock can double as a receiver lock.

- 2999DAT

by: Tom09/11/2012


My first choice in king pin locks didn't work, the wedge from the Reese Sidewinder prevented me from placing the cap all the way up/around the king pin. This Master Lock was my 2nd choice. Good visibility, easy to place, but something about the lock mechanism makes it a bit tricky to get closed. As usual, great service from eTrailer.com! 54407



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by: Andrew D.07/24/2017


Enclosed is a picture of the king pin lock I purchased from etrailer Great peace of mind for the RV when not using it Thanks 409883



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by: John H.01/26/2017


I purchased this king pin lock for my fiver.......it fits perfectly and is well constructed. I have a Reese Fifth Airborne king pin ......the "wedge" is not an issue. I have purchased many items from etrailer and have been very happy with their service and products. No problem getting questions answered if needed. 335629



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by: Richard C.07/06/2015


Just came back from camping.The products that your company sent me were excellent. I want to thank you for the great service again. 209643



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by: Ben S.06/16/2017


It worked on my one trailer, but on my other trailer it wouldn't fit on the king pin far enough to put the pin through the bracket 394835



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by: Kent T.09/06/2013


Works as advertised, received when promised. What more can you ask for? 98538



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by: Chuck B03/02/2011


Fits well and weill add secturity when trailer is left out in storage. 8246



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by: Steve04/16/2017


Fast shipping fits great ,just what I needed . 368099



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by: Rick B.03/29/2017


Good 5th wheel pin lock. Works as descr iption. 360231



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by: Sammy M.05/17/2012


Thank you for the fast delivery. 40840



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by: Sherry03/24/2016


Excellent and fast shipping. 241593



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by: kristy p02/02/2012


Works great 30890


12
12


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VS

Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers




Code: ML389DAT


162 reviews

Retail:$29.31

Our Price: $24.95


Quantity: 


Product Specs:

Trailer Locks

Coupler Lock

Surround Lock


Standard Coupler Lock

Keyed Unique

Fits 1-7/8 Inch Ball
Fits 2 Inch Ball
Fits 2-5/16 Inch Ball

Master Lock


Keep your trailer safe from towaway theft with this universal coupler lock. Its tough frame fits in and around most 1-7/8", 2", and 2-5/16" ball couplers; and it has a bright red color and heavy-duty construction to deter theft.

Video of Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers


Customer Reviews

Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers - ML389DAT

Average Customer Rating:  4.9 out of 5 stars   (162 Customer Reviews)

Keep your trailer safe from towaway theft with this universal coupler lock. Its tough frame fits in and around most 1-7/8", 2", and 2-5/16" ball couplers; and it has a bright red color and heavy-duty construction to deter theft.

- ML389DAT

by: Larry Simon09/23/2016


I received the Master Lock Trailer Coupler Lock that I ordered. It was delivered in just a few days just a it was supposed to. It is exactly what I was looking for. It will help detour anyone from stealing my trailer ! I am extremely happy with the lock and etrailer ! I think this is a great company with great pricing on there products ! I will recommend them to everybody and will be ordering with them again real soon ! It was an easy and excellent experience. Great customer service too ! Thanks etrailer ! 298258



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by: brandon08/25/2016


This is a terrific design since unlike padlocks, can't easily be cut with bolt cutters. I like the bright red color which tells a thief there is a lock to deal with from a distance. I think someone who wants your trailer can probably defeat any system you use, so the goal is to make it tough as possible and I think this lock does that. 287555



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by: Sue R.02/20/2016


We have two vintage trailers. The first one is a 1948 Spartan Manor, we haven't tried the lock on it yet, and the other is a 1958 Aloha which I put the lock on it and it fit like a glove! It was really easy to put on too, so I think it should fit the Spartan just fine also. We got one for each trailer. We like the color for two reasons, one, being red, you can see it clearly, less chance of running into the front of the trailer. Two, it lets thieves know there is a lock on the trailer, and it wont be easy to steal without making a lot of noise. We were pleasantly surprised when the lock came and found it so well made. It's not light or wimpy at all. We're very happy! Thanks for the peace of mind. 238293



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by: Loren E.07/23/2017


This lock does a good job of denying access to the trailer hitch ball so that the trailer is less easily stolen. However, an inventive thief could still chain to the hitch and tow the trailer away unless the wheels are somehow locked against rotation. This is a good initial safety measure and works well as intended to deny access to the hitch ball. The only issue I have seen is that the cover quickly faded to pink color in the sun and is no longer bright red - only a cosmetic issue. 409492



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by: Ray G02/18/2016


This 'Master Lock' is a great item in added protection for my modified cargo trailer. We all work hard in keeping what is ours' ours. There's always that impulse for those shady individuals out there in breaking a simple lock in taking your hard earned items. This Master Lock looks very durable and notable in given them second thoughts. Thanks' George J. For a quality item' great shipping and packaging. Will highly recommend "etrailer" to new friends I meet on the road. Regards' RG 238081



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by: Richard Davis07/19/2016


This master lock trailer coupler fits my camper tongue perfectly and is easy to install, remove and store. The red coated steel body is heavy, solid and secures the tongue against thief as stated in the directions. I like the red powder coating for its visibility, as well. The key well is water and dust proof and stands up to those adverse conditions. This is a must for securing any trailer, any where, any time. The price is fair and the lowest I found anywhere. 273905



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by: Start2hunt06/21/2017


I ordered multiple items, Trailer Wheel Covers, Trailer Tie Downs, Trailer Tire Chocks, Trailer Ball Lock and Wench Recovery Kit. Everything was delivered as expected. The entire team was courteous and very communicative with items which were back ordered.They waived shipping on the back ordered items, while allow me to add to the second shipment. Thanks for the awesome consumer experience. I will definitely be ordering from you guys soon!!! 399269



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by: SoCalwithToys08/17/2017


This lock was chosen by me for medium security of our 20' boat. I was installed easily and will keep most who want to try to steal something like our boat away. If they really wanted to, a sledge would destroy this. Where there's a will there's a way. For our 31' trailer, I opted for another model. That would take a lot more beating to 'maybe' get off the hitch. It also costs about 8 times as much though... 421763



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by: Dennis C07/21/2016


etrailer.com rocks!!! Ordered this item and needed it in 2 days in order to take on my trip. I messed up the address on my order, and was concerned it would not get here in time. etrailer.com automatically fixed my error, and I received it in 2 days. You guys are so efficient. Great service, great product! You guys should be running Washington. We need competency there in the worst way. 274389



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by: James06/26/2016


Nice lock and fit my small trailer nicely. It looks like the coating should last as I have the trailer in a coastal region that the last lock (different brand) lasted about a year before the plating was rusted. One of my other boat trailers has a Master lock on it that has been on it for 9 years with no rust, unfortunately that model wouldn't fit the small trailer. 265280



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by: Daren B.07/22/2017


Fortunately no one has ever tried to pry it off or otherwise remove it, but maybe that's because it's a visible deterrent. I like the ease of application, and the locking mechanism works well. The only minor issue is the color seemed to fade in the hot Texas sunlight pretty quickly. But by all accounts, it's working as it was advertised. 409325



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by: Dale W.12/07/2016


We received 10" of snow so I have not tried this on the trailer yet, but I have a new unused coupler that it fit perfect I will be ordering more of these for myself as these are Christmas gifts. Sierra H. was easy to work with and was very concerned that I got the correct product. Thanks to her and etrailer !! Happy Holidays to all!! 323028



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by: Eddie C.08/18/2017


Have used these before and they are excellent. Easy to use, compact and provide good security. My older one is chrome and I hope this color (red) is as durable as the chrome. Was glad to find them at ETrailer, ordering was easy and quick and the product arrived within 5 days. Will recommend this product and ETRAILER to my friends. 422181



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by: Cris B.07/01/2016


With drive off trailer theft going up in our area I had to find a way to protect my cargo trailer that was easy for me to apply and tuff for some would be thief to get past. BINGO this coupler lock is just the ticket, it slips on in a jiff and blocks the coupler from being used. The best part is it’s a Master Lock and tuff as nails. 267141



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by: Jim D.07/14/2017


A determined thief will defeat just about any kind of locking device. That being said, even the most aggressive thief will have a hard time with this product. Compared to the other types that use softer materials, this thing is built like a tank. This locking device inspires a lot more confidence than the one it will be replacing. 405570



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by: Andy J - Atlanta09/30/2016


Great device. I have historically used a couple of other coupler locks over the years and this is the best yet. Was a little skeptical when I ordered it as I have multiple trailers with multiple hitches but this one fit all three I tried last night - an more snugly than the other "yellow" brand I normally default to 301755



- ML389DAT

by: James06/05/2017


Had bought another type of lock for my concession stand trailer but it would fall right off. Did a google search and found This awesome lock! The video is what sold me! excited when it arrived and fit like a glove! Perfect lock and perfect fit! The lock was delivered fast and was able to secure my property safely! 389277



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by: GR06/28/2017


This should deter most anyone that want to try and break it. Fits nice and works well. In the end there are two bolts holding on the coupler so if someone was really determined they could remove the coupler. I'm very happy with this and the bright color that should deter all but the most determined thief. 399963



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by: John H.08/18/2017


Trailer lock arrived, & installed on my boat trailer just as etrailer said it would. I wasn't in a hurry & used the standard shipping which got the lock to me in just a few days. etrailer shipped the same day as the order. Looks like a solid lock, & the red color makes it very easy to spot. 422272



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by: csewell07/13/2017


My contact via email with customer service department was a pleseant surprise as they responded quickly and was very helpful. I received the 2 items that were ordered for our travel trailer in a very timely manner. I will definitely use etrailer again for any of my trailer needs. 405919



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by: Mark06/02/2017


I just received the coupler lock today so its to soon to write about quality other than it is heavy and seems to be built well. The shipping from etrailer is very quick, paid extra for the three day delivery and it was on time. I've attached it to my 2 5/16" coupler and it fit great. 388082



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by: Rob Dickerson09/14/2016


Very heavy cast iron construction paired with it's practical design make this the exact product we were looking for to secure our travel trailer while in storage. I prefer this over a competitor's product because I feel the design makes it harder to remove by a thief. 294548



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by: Hal Mcc01/23/2017


Thanks for making the order process easy to understand and complete. The delivery was made in a fast and the product was exactly what I needed, ordered and wanted. Thank you and I will definitely order additional products from your company. 337288



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by: James E07/18/2017


So far so good ,easy to put on and I think this is a great deterrent to would be thieves . Of course if they really want your trailer they will get it ,but this will stop and make them think twice . I would buy again . 407287



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by: Charles F Dorman08/17/2017


The above (new) Master Lock Universal Coupler Lock, is a upgrade to the current coupler lock that I currently have on my 4x6 Utility trailer, also, it will be a lot easier to lock/unlock the new coupler! Thanks! 421801



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by: woz07/04/2016


very simple. nice and bright . nothing is full proof but this seems like a good deterrent especially since it doesn't seem to have a place for thieves to use bolt cutters like some of the other options i've seen. 267975



- ML389DAT

by: Tony Z11/20/2016


Purchased to secure my new trailer in an unsecured lot. Item easy to use. Good as a short term deterrent but not fully secure. Others on the market that are indestructible, but hey, you get what you pay for. 318238



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by: Mike Darby02/03/2016


This is a heavy-duty lock that also serves to deter thieves with its bright red appearance. The price was very reasonable and the lock actually arrived early. Thanks etrailer! You'll be hearing from me again. 236875



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by: Jeff B.02/15/2017


Recently bought the Masterlock coupling lock; it is well made, easy to install/uninstall, and we will be testing it this weekend, as I have to leave my trailer alone in a motel parking lot... FOR THE WEEKEND! 342155



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by: Gerald O02/25/2016


Waiting on trailer to use this product, but very impressed by the quality of operation. As far as shipping-WOW! I got the product in two days. Hally was fantastic! Keep up the great customer service! 238630



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by: Gary04/28/2016


im retired from law enforcement and have seen EVERYTHING stolen so this lock is another layer of defense from the bad guy. It works very easily, is strong and with it being red, it is quite a deterrent. 247257



- ML389DAT

by: Gary04/28/2016


im retired from law enforcement and have seen EVERYTHING stolen so this lock is another layer of defense from the bad guy. It works very easily, is strong and with it being red, it is quite a deterrent. 247256



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by: Emery B11/29/2016


I bought this for my snowmobile trailer. It works well an I am very happy with it. It fits firmly into my 2" ball. The red is highly visible and lets me know that its installed in the trailer tongue. 320673



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by: Larry j.08/12/2017


My wife said it must work pretty good because we still have the trailer. It's true it does do what it is supposed to. I would have given it 5 stars but the paint on the lock fades pretty fast. 419359



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by: Mark08/03/2016


Ordered the product and received it a day ahead of the scheduled delivery date. It certainly is what I ordered. Did also receive an email to let me know the order was processed. Good service. 279256



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by: Jack Groshans09/09/2017


The product was a perfect fit. Looks like a great security measure, I am adding an additional component. My purpose is to make theft of my trailer look like its too much trouble to undertake. 430588



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by: Kendall S07/08/2017


Locks it up tight so I don't have to worry about the local goons taking my trailer. It's a shame you have to lock everything up these days. If it's not set in concrete people will steal it. 403190



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by: Toby R.10/09/2015


Got my Lock today and will install it on a Jayco travel trailer on Sat. This lock will work on my ATV Trailer, Bobcat Trailer, and my Utility trailer. Its a perfect lock for any trailer. 229619



- ML389DAT

by: PJ Carhauler Trailer Dude08/18/2016


Bull Dog brand so you can't go wrong - a step above just a pin - BD580410 might be better adjustment wise against my Bull Dog coupler. Also use a coupler lock like Master ML389DAT. 284993



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by: Bob H.09/12/2017


Held up well through a tough winter. Too bad the paint has faded to a soft pink. Mechanically sound device. Not sure how a slide hammer would fare against the locking mechanism. 431768



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by: Ricke12/21/2015


I am happy with these locks, they seem very strong. I promptly received my confirmation after ordering and was able to track. Package arrived on time, I'm happy happy. RE 234009



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by: Willy Ray04/28/2017


Just about had my trailer stolen with a slightly less expensive Reese trailer lock. These master locks fit much tighter and appear to be much stronger. Thanks etrailer! 373654



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by: Vicki B01/20/2017


This produce is great. You can leave your trailer without worrying about it still being there when you get vack. Very easy to put on, looks clean, and safe. Thank you! 334069



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by: cindy03/30/2017


Great hitch lock. Sturdy, easy to apply, and visible to deter thieves. I have used it for a year now, and it is still in good working order keeping my trailer safe. 360410



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by: Mike A01/13/2017


Fast Shipment! Product is easy to install and seems secure. This looks better than the yellow loop variety that can be disabled with one swing of a ball-peen hammer. 332318



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by: Jeff M.12/21/2016


I purchased this lock. It works fine but it is already fading. I know it's red but I did not think it would do this within 2 months since I purchased it in November. 327118



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by: Mike09/04/2017


Seems to be tough enough to at least be a good deterrent to thieves. I like that it is adjustable for several sizes of ball socket. This lock looks to be a winner. 428627



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by: Steve D.08/01/2017


Securely locks trailer hitch so that no one can easily steal your trailer. The red paint has faded a bit in the hot Florida sun, but the lock works as advertised. 413721



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by: Bobby B.05/07/2017


The Master lock tongue lock is still working great after a year. Gives me a sense of security when the trailer is sitting at the shop. Thanks for a great product. 377380



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by: Terry C.01/07/2017


Excellent product and service from trailer. Spoke with representative who was very helpful. Item received quickly and worked as described. Highly recommend. 330668


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