Discover Our King Pin Locks
We machine every king pin lock in this collection to cover the exposed kingpin on a parked fifth wheel or semi-trailer, so no one can back up, couple, and tow it away. Our range covers 3 custom-fit models, each matched to a different hitch type and level of security.
Heavy Duty King Pin Lock for Fifth Wheels
Our heavy duty king pin lock starts at $155 and fits standard fifth wheel and semi-trailer king pins with no drilling and no brackets. The body is CNC-machined from ductile iron with stainless steel moving parts, so it holds up against cutting, prying, and drilling attempts. You can pair it with our RV trailer locks to secure the rest of your fifth-wheel RV, because a locked kingpin doesn't help much when the coupler is left open.
Pullrite and Sidewinder King Pin Lock
Pullrite and Sidewinder fifth-wheel hitches use a different geometry than standard king pins, and this $155 model is machined specifically for them. The custom fit leaves no gap to pry against, which a universal shell can't promise. Installation takes seconds thanks to our patented push-and-lock mechanism.
Extreme Security King Pin Lock
At $499, our extreme security king pin lock is the premium tier for high-value cargo and commercial rigs that sit unattended overnight. It pairs a thicker machined body with an anti-pick, anti-drill disk cylinder, so protection holds even under a sustained attack. You can standardize on it alongside our commercial trailer locks when a full yard needs the same level of security.
Why Choose AMPLock for Your King Pin Lock?
North American Materials and CNC Machining
Every AMPLock king pin lock is CNC-machined from ductile iron and stainless steel sourced in North America. Machining each model in-house instead of casting a generic shell is what lets us hold tight tolerances on every hitch type, and that quality shows the first time you fit the lock.
Keyed-Alike Convenience Across Your Setup
Our anti-pick disk cylinder turns under attack and runs on a controlled key that can't be copied at a hardware store. Every lock can be ordered keyed alike with the rest of your AMPLock hardware, including retroactive matching to a key number you already own. One key runs your whole setup.
Warranty, Free Shipping, and Support
Each lock is backed by a 5-year warranty with registration, free shipping in the US and Canada, and free 30-day returns. More than 250,000 customers rely on our hardware, and we hold a 4.7/5 average rating on Amazon. Our support team helps you match the right model to your hitch before you order.
Shop King Pin Locks at AMPLock Today!
Trailer security starts at the hitch, and an unattended kingpin is the fastest way to lose a trailer to theft, along with everything loaded in it. Our custom-fit king pin locks protect fifth wheels, semi-trailers, and commercial rigs with machined steel and a key only you control, the same standard that runs through the rest of our trailer locks range. Pick the model that matches your hitch and shop with free shipping and a 5-year warranty.
Frequently Asked Questions About King Pin Locks
What Does a King Pin Lock Protect?
A king pin lock covers the exposed king pin on a dropped fifth wheel or semi-trailer. With the pin enclosed, another truck can't complete the coupling, so the trailer can't be hitched and towed off your lot.
How Do I Choose the Right King Pin Lock for My Trailer?
Start with your hitch type, because fit is what makes a king pin lock secure. Our heavy duty model suits a standard fifth-wheel hitch or semi-trailer king pin, the Pullrite and Sidewinder model matches those hitches, and the extreme security model is built for high-value loads.
Are AMPLock King Pin Locks Keyed Alike?
Yes. Every AMPLock king pin lock can be keyed alike with your other AMPLock locks, and we can match a new unit to a key number you already have. Each one uses the same anti-pick disk cylinder, so security doesn't drop when you simplify your keys.
