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Fastway Universal Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers - Key 312

Fastway Universal Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers - Key 312

Our Price: $54.13
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Trailer Coupler Locks
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Shipping Weight: 3 lbs
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FA86-0015-312 - Fits 1-7/8 Inch Ball,Fits 2 Inch Ball,Fits 2-5/16 Inch Ball Fastway Surround Lock
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Protect just about any trailer from theft with this universal coupler lock, which uses a unique "ball" and shackle to fit a variety of coupler sizes and styles. Secures trailer when it is not in tow. Great Prices for the best trailer coupler locks from Fastway. Fastway Universal Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers - Key 312 part number FA86-0015-312 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (832)
  • Q & A (0)
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  • Why etrailer?

Fastway Trailer Coupler Locks

  • Fits 1-7/8 Inch Ball
  • Fits 2 Inch Ball
  • Fits 2-5/16 Inch Ball
  • Surround Lock
  • Keyed Alike
  • Fastway
  • Universal Application Lock

Protect just about any trailer from theft with this universal coupler lock, which uses a unique "ball" and shackle to fit a variety of coupler sizes and styles. Secures trailer when it is not in tow.


  • Universal design protects most trailers from being towed away
    • Multistep Uni-ball fits into any size ball coupler
    • Unique bend in reversible shackle lets it snug up tight to most types of couplers or coupler latches, including:
      • A-frame, straight channel, round tongue, flat plate and surge-type couplers
      • Trigger, pin, thumb and wraparound yoke latches
  • Tube key lock cylinder provides better security than standard key mechanisms
    • Harder to pick
    • More difficult to duplicate keys
  • Anti-drill pin discourages attempts to drill out the lock
  • Bolt-blocked locking system prevents thieves from prying the lock open
    • Uses internal bolts to engage the shackle's notches
  • Hardened, chrome-plated shackle and nickel-plated housing
  • 2 Keys included per lock
    • Key number: 312
  • Quantity: 1 lock


  • Fits most 1-7/8", 2" and 2-5/16" ball couplers
    • Maximum coupler width: 4-1/2"
  • Shackle diameter: 5/8"
  • Limited lifetime warranty

Close up of bolt block mechanism

This close-up bottom view shows the solid steel bolt in the locked position where it would engage the shackle. (The shackle has been removed to show the bolt.)

DT25013 in useDT25013 in use
DT25013 in useDT25013 in use
DT25013 in useDT25013 in use

The above images show the lock in use on several types of trailer couplers

Dimensions of DT25013

86-00-5015-312 Fastway (Diversi-Tech) Maximum Security Trailer Coupler Lock - Key # 312

Item # FA86-0015-312

Customer Satisfaction Score:

Customer Reviews

Fastway Universal Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers - Key 312 - FA86-0015-312

Average Customer Rating:  4.7 out of 5 stars   (832 Customer Reviews)

Protect just about any trailer from theft with this universal coupler lock, which uses a unique "ball" and shackle to fit a variety of coupler sizes and styles. Secures trailer when it is not in tow.


Exactly what I was looking for!! Ordered 3 keyed alike. So far its my favorite hitch lock, replacing one that I had so one key works for all 3 trailers!!! Showed up quickly!


Good coupler lock! Fits 2022 Jayco 166FBS Jay Feather just fine. Does what it is intended to do, plus gives good peace of mind when you are away from the trailer. We use it all the time and would not be without it.


I bought quite of few of these for our work trailers and they've held up better than any other trailer locks we've tried in the past. Would 100% recommend these and buy them again when needed or we add more trailers to our fleet.


Great product. Totally secured all of my trailers. Easy to use


I needed 3 of them all keyed alike. They work well on all 3 trailers with each one of them having a different type of coupler.


Great products. Very convenient to have all my trailers locked and using only one key


I have used the lock several times and feel safer about leaving my trailer at the camp ground for short times unattended.


It works well and is easy to put on and remove. Very robust but only 4 stars because it is starting to show rust.


With two boats and two utility trailers, it was nice to find a quality lock(all keyed alike) to protect my investments.


As usual, quality products at a fair price and quick shipping.


Works just fine. I have it in place any time the trailer is unhitched.


These locks Are some of the strongest and easiest to use. The jets are more reliable than standard keys and never seize up and the keyed alike gesture makes it great for my fleet of different trailers.


always the best place to go for trailer items. Quick shipment, good prices...


Very pleased with process and the produ ct.


The order process was simple and quick. Product arrive as per shipping request. I had looked at and tried several other lock over a period of several weeks from local stories but nothing came close to working. This lock fit on my 2005 Jayco hitch. This Fastway was the only one that was wide enough to fit the large flange on this hitch. It was easy to install and looks strong.

It has work great. Easy to use and still looks good.
Dennis L - 01/16/2018


Fast service


I real like the trailer lock but I have to say This is the 3rd lock I have bought and one of them the key position where you insert the key to the lock has been off like a little sideways so I cant insert the key and I tried to fix it but cant. And the funny thing about it I dont know how it happened or how I got the key out because you cant get the key out in that position.


Works great , I have 3 trailers this just what I wanted , heavy duty !


Locks seem heavy duty. I tried them on 4 different types of locks and found no issues with them locking. I purchased these for our whole fleet of trailers so time will tell how the hold up.


Purchased 3 locks keyed alike, (also matched my Fastway adjustable hitch) Installed locks on two trailers, one coupler is a 2" and the other is a 2 5/16. Due to the coupler design the fit on the 2 5/16 the lock is pretty sloppy but it won't come off, I'll try to incorporate the safety chains under the loop and see if the helps.
The third lock will be used by a family member, and since they're all keyed the same we can use each other's trailers.
etrailer has always been great to deal with, as usual parts arrived on time.


This lock feels very solid and seems to be a huge upgrade to the previous locks we had purchased. It closes on all 4 different hitches we have. I am ordering 2 more.


Happy duty lock.


Fine,works well


Nice lock. Fit my trailer with the wide tongue. Now, I don’t have to worry about my brother Walter borrowing it with out me knowing.


These work about as well as any tongue lock for trailers I have used. I have about 15 of them and would buy them again. These folks are good to work with and helpful. Recommend them as well.
General Contractor

Show More Reviews

See what our Experts say about this Fastway Trailer Coupler Locks

  • Coupler Lock Recommendation for 2017 Jayco Jay Feather 22FQSW
    We have found that the Fastway coupler lock part # FA86-0015-312 is very universal and can basically fit most couplers on the market. If you check out the review video I attached you can see all of the coupler style it works on.
    view full answer...
  • Bulldog Coupler with Wedge Latch Coupler Lock Recommendation
    The Fastway Coupler lock part # FA86-0015-312 is the most popular coupler lock design we have because it easily fits nearly all coupler designs including the one you sent in a picture of. This would be the best option we can recommend.
    view full answer...
    Image 1 for
  • Best Coupler Lock Recommendation for Atwood Yoke Coupler
    For the yoke style couplers my favorite coupler lock is the Fastway part # FA86-0015-312. We have found that this is the most universal of the locks we carry and also works the best. It will work great on your yoke coupler part # AT80072. I attached a picture that shows it installed on a similar yoke coupler as well.
    view full answer...
    Image 1 for
  • What Type of Metal is Fastway Universal Coupler Lock # FA86-0015-312
    The Fastway Universal Coupler Lock # FA86-0015-312 that you referenced is made from hardened steel for the shackle and diecast steel for the housing and is designed to withstand most attacks. It would take some serious time to defeat this with a pry bar and sledgehammer. The sledge would also make quite a bit of noise which thieves generally try to avoid.
    view full answer...
  • Coupler Lock Recommendation for a Square Trailer Coupler
    The Fastway Universal Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers # FA86-0015-312 should work just fine for your squared coupler. If you check out the attached photo you can see when we installed this on a squared coupler. I have also attached a review video where we installed this on a variety of couplers that you can check out.
    view full answer...
    Image 1 for
  • Is Fastway FA86-0015-315 Universal Trailer Coupler Lock Available Keyed to Key # 312
    You certainly can, just order 4 of part # FA86-0015-312, which will get you 4 of the Fastway Maximum Security Universal Trailer Coupler Locks keyed to key number 312. The lock is compatible with couplers for 1-7/8, 2 or 2-5/16 inch trailer balls. The # FA86-0015-315 lock you'd looked at is keyed to key number 315, so it wouldn't use your desired key. If you click the provided link, you can see a product demonstration video featuring the lock.
    view full answer...
  • Can Fastway Universal Coupler Locks Be Keyed the Same
    I confirmed with Fastway that yes, if you order multiple of these coupler locks with the same key code, they will be keyed the same. For example the Fastway Universal Coupler Lock # FA86-0015-306 uses Key 306 while the Fastway Universal Coupler Lock # FA86-0015-312 uses Key 312. As long as your ordering multiple coupler locks using the same numbered key you will be fine. I have have also included a review video for additional information on the coupler lock.
    view full answer...
  • Replacement Key for Fastway Universal Coupler Lock with Key Code 312
    I'm not quite sure I'm understanding which part you're looking for a key for, but the # FA-KEY-312 you were looking at is designed to replace the key for a Fastway Universal Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers - Key 312 # FA86-0015-312 with key number 312. If that's the part you're looking for, then you've found the correct key. If that's not what coupler lock you've got, let me know what you do have and I can see if there is a replacement key available for it.
    view full answer...
  • Availability of Two Sets of Keyed Alike Universal Trailer Coupler Locks
    I'd recommend the Fastway Universal Coupler Lock, part # FA86-0015-312 and # FA86-0015-310. Both are available in multiple units, and would give you two keyed alike sets, with both sets using a unique key. The lock is compatible with 1-7/8, 2 or 2-5/16 inch couplers.
    view full answer...
  • What is the Height of Fastway Coupler Lock DT25013KA
    The Fastway # FA86-0015-317, # FA86-0015-312 and the # DT25013KA are all the same locks and will be the same size. The reason for the different part numbers are that the # FA86-0015-317 and FA86-0015-312 are locks that can be ordered keyed alike a similar Fastway lock (key numbers 312 and 317), where the # DT25013KA comes with a randomly assigned key/lock combo. The # DT25013KA is a great choice if you don't already have a Fastway lock that you're trying to match.
    view full answer...
    Image 1 for
  • Recommended Trailer Coupler Locks Keyed Alike For A Number Of Trailers
    We have the Fastway Universal Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers - Key 312 # FA86-0015-312 that you can order in any quantity. They will all have the same key number 312. I've attached a photo with measurements. I've also attached a video of various trailer couplers for you. This will secure the trailer when disconnected from the tow vehicle. If you want trigger couplers and ball mount locks, I recommend the etrailer Trailer Hitch Receiver & Coupler Lockset - 2" Trailer...
    view full answer...
    Image 1 for
  • What is the Difference Between Fastway Coupler Locks DT25013KA, FA86-0015-312, and FA86-0015-317
    Basically the three part numbers you mentioned give you the same lock but the different part numbers allow you different options for the key. The part # DT25013KA gives you the lock with a random key number. If you order the part # FA86-0015-312 you get the key number 312, or the part # FA86-0015-317 you get the key number 317. So if you are looking to order a few with the same key you pick one of the two previously mentioned. The part # e98882 can not be keyed to the Fastway locks as...
    view full answer...
  • Recommended Trailer Coupler Lock For 5 Wide Coupler
    The surround-type trailer coupler locks can only fit couplers that have a maximum width of 4-1/2". For a 5" wide coupler you will need to use a latch lock such as the Master Lock Trigger Style Coupler Lock for 1-7/8" and 2" Couplers # 605DAT or Trailer Coupler Lock # e98886
    view full answer...
  • Availability of Extra Keys for Trimax Dual Purpose Coupler Lock and U-Lock
    It is possible to get extra keys/replacement keys for the Trimax Dual Purpose Coupler Lock and U-Lock # TMX67FR. However, you will have to get the number off of the key and submit it to the manufacturer separately. If you would rather avoid that process and the additional time it would take, I recommend the Fastway Universal Trailer Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers # DT25013KA instead. This is a similar lock with a universal design. Also, you can choose the key code and...
    view full answer...
  • Recommended Trailer Coupler and Trigger Lock
    If the Fastway Universal Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers - Key 312, # FA86-0015-312, coupler is not snug, it may not be installed correctly. I've attached a video review for you to check out and make sure. If it is installed correctly and still doesn't meet your needs, then I recommend a different style of coupler lock like the Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers, # ML389DAT. You may also be interested in a trigger lock like the Master...
    view full answer...
  • Demco 21K EZ Latch DM6125-81 Coupler Lock Solution
    Since the Demco Trailer Coupler # DM6125-81 that you have does not have a lip around the edge of the coupler you'd need to go with a different coupler lock instead of the part # AMP56FR that you referenced. Instead you'd want a coupler lock like the Fastway part # FA86-0015-312 which is compatible.
    view full answer...
  • Recommended Locks for 2-5/16-Inch Squeeze-Latch Type Trailer Coupler
    To secure your squeeze-latch type coupler such as # CTA-280 you can use a latch pin lock such as # 2847DAT with a coupler lock such as # FA86-0015-312 or the Master Lock # ML389DAT.
    view full answer...

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Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Dustin K
Video Edited:
Dustin K
Employee Cole B
Installed by:
Cole B
Employee Chris R
Installed by:
Chris R
Employee Hayden R
Installed by:
Hayden R
Employee Wilson B
Updated by:
Wilson B
Employee Adam E
Video by:
Adam E

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