TowWorks 79631 Keyed Unique 5/8" Trailer Hitch Lock with Extra Long 3-1/4" Span, Double Safety Tow Hitch Receiver Locking Pin for Class III IV Hitches with 2" and 2.5" Receivers
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This item is eligible for return within 30 days of receipt
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Availability:
In Stock.
Arrives
Sep 12 – Sep 13
Color: Black 1pc 5/8"
Features
- EXTRA LONG PIN FITS 2" and 2-1/2" RECEIVERS - Extra long 5/8" diameter locking hitch pin with maximum active length 3-1/4", fits Class III/IV hitches with 2" and 2-1/2" receivers. Solid hardened steel tow hitch lock pin with black e-coated on zinc plated finish. * Before purchase, please verify all dimensions of your hitch, to get a great fit of the hitch lock pin
- SPRING CLIP (COTTER PIN) PROVIDES ADDITIONAL SAFETY - A separate spring clip (cotter pin) provides additional safety, can use the locking pin with or without the lock mechanism. * Caution: R spring clip (cotter pin) MUST be inserted into pin hole when use this lock
- RUBBER O RINGS KEEP RATTLES DOWN - Rubber O rings prevent any rattling and hold the hitch pin still. * Different brand hitches may have a little different hitch tube size, please adjust O ring quantity or remove O ring to fit the receivers
- PUSH LOCK DESIGN WITH 2 KEYS - 2 tubular keys making it easier to lock and unlock, 1/4 turn lock and push lock design, easy to operate, watertight dust rubber cap prevents locking mechanism internal corrosion
- EACH LOCK KEYED UNIQUE: This item 79631 each lock keyed unique, NOT keyed alike. * Remark: If you need 2 locks keyed alike, please choose 79632; if you need 3 locks keyed alike, please choose 79633; if you need 4 or more than 4 locks keyed alike, please choose 79630 and give the quantity
Material: Alloy Steel
Size: 5/8" NOT Keyed Alike
Pin type: Hitch
Brand: TowWorks
Item Diameter: 5/8" Inches
Color: Black 1pc 5/8"
Finish Type: Black e-coated on zinc plated
Number of Pieces: 1
Manufacturer: TowWorks
UPC: 601703717372
Model: Hitch Lock
Item Weight: 1.17 pounds
Product Dimensions: 7.7 x 1.2 x 1.2 inches
Item model number: 79631
Is Discontinued By Manufacturer: No
Exterior: Black E-coated on zinc plated
Manufacturer Part Number: 79631
Date First Available: December 17, 2018
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sep 12 – Sep 13
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Color: Black 1pc 5/8"
Great design! I looked for this type of lockable hitch pin for a long time. Most lockable pins use only the locking head to keep it from sliding out of the receiver, which I would never trust. Typical locking heads are only held on by tiny ballbearings in the locking mechanism. Failure in the lock could result in the pin working its way out of receiver, possibly while towing. This lock actually has a cotta pin that keeps it from ever sliding out. The locking head is strictly for security, to prevent theft. A very smart and thoughtful design. Even better, the lockable head can be attached without having to use key. This is another great feature which makes working in a tight space to secure the hitch pin much easier.
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Reviewed in the United States on June 16, 2025 by Jimmy M.
Color: Black 1pc 5/8"
I compared the TowWorks P/N 79631 with the AUTMATCH Trailer Hitch Lock, P/N MHL002C. Both appear to be quality products and similar in their design and construction. Both have a safety pin feature that supplies extra protection in case the lock head goes missing. I specifically wanted this feature and ruled out many others that did not have it. The advantage of the AUTMATCH is that it has a slightly longer usable width of 89mm compared to 82mm on the TowWorks. This allows it to fit some receivers that the TowWorks won’t. However, I must point out that TowWorks has a larger 798xx series that has a usable width of 114mm. The advantages of the TowWorks are: (1) the lock head grips the shaft with three ball bearings compared with only two ball bearings in the AUTMATCH. To me, this is a more secure way of holding the lock to the shaft. (2) the shaft diameter is larger, 7mm compared to 6.5mm, at the narrow area where the ball bearings grip the shaft. To me, assuming the metal used in the two locks is the same quality, the added diameter of the TowWorks in this area improves its resistance to brute force attacks, i.e., sledgehammers. I ended up keeping the TowWorks and am returning the AUTMATCH for the aforementioned reasons.
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Reviewed in the United States on May 29, 2025 by TheFriscoKid
Color: Black 2pcs 5/8" Keyed Alike
used these on a trailor hitch for a 2019 dodge durango, i really like that the pin has both a lock and an actual locking pin to secure this inplace. the lock body is a little long and does make me work a little bit to get the keys in it to unlock it with the limited room i have when it it locked on the hitch. the neat part of this hitch lock is that you do not need the key in the lock to install it, like i did on the previous lock, but only to remove it. the lock body pops up when unlocked and when installing, simply install and push that part of the lock back in to secure it. i would order again.
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Reviewed in the United States on June 11, 2025 by jc
Color: Black 1pc 5/8"
Works great! Well built, smooth operation. The only issue we had was the sticker peeled of during install and removal; at one point binding up removal of the pin. Not major... now with the decal completely removed it installs and removes smoothly.
Reviewed in the United States on May 5, 2025 by Snipr2000
Color: Black 2pcs 5/8" Keyed Alike
Super high quality. I appreciate well engineered devices. Having the ability to use the included safety pin/clip is pricless, from the safely standpoint. I am very impressed with this product!!!
Reviewed in the United States on July 24, 2025 by Frederick T.
Color: Black 2pcs 5/8" Keyed Alike
I can't speak to the security of the lock. Most of these are pretty easy to break off if someone wants to. Just check out YouTube videos. I bought this lock set to discourage people from walking off with the receiver hitch mount when the boat isn't attached. The lock is certainly easy to install and remove. The locks are keyed the same and with this double set you have 4 keys so you have plenty of spares. My hitch is the 2" square mount and the locking bar has a safety pin that goes through the bar just in case the lock comes off for any reason, to keep the bar in place. There are 2 holes for the pin with O-rings to keep the pin from shifting during travel. The lock has a rubber cap to keep out dirt and water. The lock, once unlocked, doesn't require the key to lock, just push in the lock button. My boat trailer safety chains are fairly thick and when the lock is installed it's difficult to put the chains through the hole on the lock side of the receiver. It took a couple of times to get used to it and now it's not bad at all. That's not true for the chains and hooks for my Airstream travel trailer. The chains on that are really stout and the hooks are large. It is next to impossible to get them through the hole in the hitch because the lock head is in the way. You have to put the chain in before installing the lock. Overall I'm pleased, but I've seen the videos where it takes only moments to break the lock. It is handy to use and it fits nicely inside the receiver.
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Reviewed in the United States on May 10, 2021 by Richw
Color: Black 1pc 5/8"
I have had a few different styles of these from different manufacturers, this one is one of the better ones. I have had this now for a few years and it has held up very nicely. The cap that covers the lock has stayed in place and has kept corrosion out of the lock portion. The whole thing has held up nicely to the elements, it has been exposed to rain, snow, and salt, and thus far is not corroded and still comes apart and connects very easily. If I ever needed another one of these, I would definitely buy this one again.
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Reviewed in the United States on January 10, 2025 by JB
Color: Black 5/8" Adjustable
Fantastic product. High quality manufacturing and operation. Highly recommend. Company support is extra ordinary. I had an issue and they responded fast and took care of the issue immediately. Outstanding!
Reviewed in the United States on June 8, 2025 by John L.