AMPLock King Pin Lock for 5th Wheel Trailers - Conical - Ductile Cast Iron

Part Number: AMP77FR

In Stock

$250.00

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amplock king pin locks lock for 5th wheel trailers - conical ductile cast iron

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In-Depth Review of the AMPLock King Pin Lock for 5th Wheel Trailers

Choosing the Right King Pin Lock For Your Trailer

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Use this sturdy king pin lock to deter towaway trailer theft. Lock fits over your fifth-wheel trailer's king pin. Resists picking, cutting, drilling and freezing. Tumbler offers nearly 1 million possible key codes. Fastest Shipping and Great prices for AMPLock King Pin Lock for 5th Wheel Trailers - Conical - Ductile Cast Iron. Read our customer reviews of AMPLock king pin locks. Call 1-800-940-8924 for expert service or order your king pin locks part number AMP77FR by AMPLock online at etrailer.com.

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Reviews (29)
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AMPLock King Pin Locks - AMP77FR

Features:

Tamper-resistant, sturdy lock deters trailer theft by preventing hookup
- Surrounds your 5th-wheel trailer's king pin
- Prevents would-be thieves from hitching your trailer to their tow vehicle
Push-and-lock cylinder locks without the need for a key
Rotating-disc-tumbler lock provides maximum security
- Nearly a million possible key codes
- Resistant to picking and drilling
Heavy-duty ductile cast iron construction
- Absorbs shock to prevent breaking
- Resists any kind of cutting, including cutting with a torch or liquid nitrogen
Conical design hinders thieves using chains
E-coat finish resists corrosion
2 Keys included

Specs:

Inner width: 2-7/8"
Inner height: 3-1/4"
5-Year limited warranty

Secure Locking Mechanism

This king pin lock has a disc tumbler locking mechanism. Unlike locks that use vulnerable spring-loaded pins, this ultra-secure lock is bump-proof. The cylinder has a series of rotating discs that can be correctly lined up only when you turn the corresponding key. Two identical notched keys are included to operate the lock. Because these keys feature 1 of nearly a million possible key codes, it's extremely unlikely that another individual will have a key that can open this lock.

U-LPC-VR AMP Lock Conical King Pin Lock for Fifth Wheel Campers - Ductile Cast Iron

Customer Satisfaction Score:

95% were satisfied with this product

5% of customers were not satisfied

Wrong item was ordered

5% of customers were not satisfied

Wrong item was ordered

4.9

29 reviews

5 Stars		(27)
4 Stars		(2)
3 Stars		(0)
2 Stars		(0)
1 Star		(0)

by: Steve 02/23/2026 One Year Later

This is my second Amplock and this one is a winner too. There's no way it's coming off without a fight. The lock spins like glass and only way the pin won't come out is if the little weather door gets in the way. You won't have to touch the grease and it isn't showing any rust at all.

by: James 09/07/2025

AMPLock offers a 15% discount on your first purchase but not free shipping. I personally like using eTrailer as they have been dependable over time, plus I usually qualify for prompt free shipping. eTrailer packaging and shipping is very professional.

by: Rolf 04/07/2023 One Year Later

Securely locks my kingpin. Heavy metal gives me that extra confidence when I leave my 5th wheel at the storage place and at campgrounds.

Super happy with this!

Rolf One Year Later

4/8/2024

I’ve been using this for a year now and still going strong. The lock works well and gives me confidence to leave my trailer wherever I need to.

by: Martin 04/25/2024 One Year Later

This thing is a beast! Very secure and well worth the investment!

Martin One Year Later

4/26/2025

Still loving it! When people ask I tell them it’s expensive but the best! Always purchase at Etrailer

by: Melissa 09/26/2023 One Year Later

Great lock! Your rv will be safe from thieves with this on your 5th wheel. It is VERY heavy and well made. Sometimes you have to hold your mouth just right when taking on and off,

by: Denny 02/04/2023

Quality, fit, and easy to use. Hopefully one of the best theft deterrents on the market by other reviews. Think the manufacturer should do a video on how difficult it is to defeat this lock it might help to justify the price.

Denny One Year Later

2/6/2024

The locking mechanism leaves a little to be desired when unlocking. Locking is easy but unlocking is a struggle. For the price I expected a better quality of locking mechanism as far as ease of use

by: Sam Sebago 02/21/2022

Bulletproof design. Extremely heavy construction.

by: Christopher 08/22/2022

Well no one has stole the toy hauler from storage….so far.

by: Brian 09/12/2024 One Year Later

Easy to lock, solid design, and peace of mind. Worth it...

by: Jeff 02/20/2024 One Year Later

Works great, the only thing I fear is losing the key.

by: Perry 05/11/2023

Fits perfectly. Expensive but protects theft of our rolling home.

by: Warren 09/30/2022

by: Brian 04/01/2025

by: Jeff 11/07/2022

by: Conor 07/18/2024

by: James 02/25/2023

by: Eric 03/31/2025 One Year Later

So far, it's been great, I've had it for about a year. No attempts of theft. If you use a lube plate, you'll need to remove it to install the lock.

Eric One Year Later

4/6/2026

Still working great and protecting our trailer!

by: Eric S 08/29/2016

Happy with this product! Although a couple week delay from the factory I was kept in the loop via email. This product is solid, clean and heavy duty. Although I know this is only a deterrent, I believe this product is superior than others on the market!

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by: Jeff b 07/07/2016 One Year Later

The lock is rock solid. I'm glad I purchased the lock for my 5th wheel RV trailer. Some of the locks out there a cheep. Not this one. You get what you pay for and this one does The job .

by: Edward 03/15/2022

I love this. It is definitely made for the Pullrite and the capture plate. Nice fit and it looks great instead of those gaudy yellow locks. This makes me feel as though my trailer is nice and secure too.

by: Stacy H 11/07/2016 One Year Later

The kingpin lock is doing fine. I don't use my 53ft dry van much now, but I am comfortable knowing that the lock is in place, working, preventing an easily stole trailer. Thanks.

by: Stephanie 04/24/2023

Fit very well. Just had a little problem with the key # and key code. Doesn't designate which is which. Also, the warranty did not have my product listed on drop down list. But other than warranty registration all is great. Customer service was prompt and attentive.. amp lock received before expected delivery date.

by: rob z 03/31/2016

I store my fifth wheel and this lock is very heavy duty. Nothing is 100% effective but this lock is very hard to tamper with compared to others.

by: Curt B. 05/22/2017

This is the sturdiest lock I've ever seen for a king pin. It will work perfectly. Thanks etrailer, as usual you guys ROCK!!!!!!!

by: Restofrank 04/06/2017

I am totally happy with the service and products of etrailer, the prices are great and the customer service is even better. I highly recommend etrailer to all of my friends! Thanks

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Info for this part was:

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Expert Research:

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Video Edited:

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Video by:

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Installed by:

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