A king pin lock is a practical way to deter someone from hitching an unattended fifth-wheel trailer. The BOYISEN models are best for buyers who want a solid-steel lock with an easy-to-reach handle; METOWARE is a good fit for buyers who value a prominent warning tag; and CURT offers an aluminum-body option with a universal design that fits most fifth-wheel kingpins. Compare construction, key details, and installation features before choosing.
| Product | Best For | Notable Feature |
|---|---|---|
| BOYISEN Solid Steel with Handle | Convenient operation | Three keys and outward-facing cylinder |
| METOWARE Black | Visible hitch warning | 12-inch chain and red warning tag |
| BOYISEN with Handle and Warning Tag | Handle plus warning reminder | Solid steel and three keys |
| Equipment Lock Heavy Duty | Simple, no-mount installation | Barrel lock system |
| CURT 23255 Dumbbell Style | Aluminum-body design | Fits most fifth-wheel kingpins |
BOYISEN Solid Steel King Pin Lock
This BOYISEN lock is best for fifth-wheel owners who want a steel lock with a handle designed to make locking and unlocking more convenient. Its cylinder faces outward rather than downward, which may make it easier to reach while working under a trailer.
The listed features include solid-steel construction, a blossom-style lock, uniquely keyed locks, and three included keys. The product also includes a warning tag. The manufacturer describes the steel as weather resistant and intended to resist damage from tools such as drills.
Choose this if an outward-facing cylinder and spare keys are priorities. Limitation: the product information does not specify a universal fit, so confirm that the lock suits the trailer’s kingpin before buying.
METOWARE King Pin Lock
METOWARE is best for buyers who want a visible reminder to remove the lock before hitching. The lock comes with a 12-inch chain and a bright red warning label tag, with English-language warning messages.
Its listed construction is high-strength iron with a double layer of electrophoretic paint intended to help resist corrosion and rust. The product is described as quick to install and unlock, and it includes two keys.
Better for: owners who value a conspicuous hitching reminder and a coated iron design. Limitation: it has two keys rather than the three supplied with the BOYISEN models. Check the lock’s fit with your kingpin before use.
BOYISEN Lock With Handle And Warning Tag
This BOYISEN model is best for buyers who want both a handle and a warning tag. Like the other BOYISEN option, its outward-facing cylinder is designed to make operation more convenient beneath a trailer. Its solid-steel body and blossom-style lock are also listed as security features.
The lock includes three keys, and the manufacturer says each lock is uniquely keyed. The warning tag provides a reminder to remove the device before hitching. This version is listed in black.
Choose this if you want the handle design plus a visual hitching reminder. Limitation: its listed features do not provide a specific kingpin size or fit range, so verify fit rather than assuming compatibility.
Equipment Lock Heavy Duty King Pin Lock
This lock is best for buyers looking for a straightforward device that does not require mounting. The listed instructions are simple: slide it onto the kingpin and secure it with the included key. Its high-security barrel lock system is described as fully covering a 2-inch kingpin to prevent hitching.
The product is made with powder-coated steel, according to its name, and is described as a heavy-duty fifth-wheel lock. Its keyed-differently designation is also included in the product title.
Better for: buyers who want a no-mount installation and a barrel-style lock. Limitation: the stated coverage is for a 2-inch kingpin; confirm your trailer’s kingpin dimensions before ordering.
CURT 23255 Dumbbell Style Lock
The CURT 23255 is best for buyers who prefer an aluminum-body kingpin lock. Its dumbbell-style design locks onto the fifth-wheel kingpin to deter trailer theft. CURT describes its design as universal and says it fits most fifth-wheel trailer kingpins.
The listed features emphasize a strong aluminum body and a broad fit claim. That makes it a useful option to compare with the steel-bodied locks above, especially when material is an important selection factor.
Choose this if an aluminum body and a design intended to fit most kingpins match your needs. Limitation: “most” does not mean every kingpin; confirm fit for your trailer before purchase.
Buying Guide: How To Choose A Fifth-Wheel King Pin Lock
Will the lock fit your kingpin?
Start with fit, not appearance. Check your trailer’s kingpin dimensions and compare them with the product’s stated fit information. The Equipment Lock listing specifies coverage for a 2-inch kingpin, while CURT says its design fits most fifth-wheel kingpins. The BOYISEN and METOWARE details provided do not give a specific size range, so confirm fit with the seller or product listing.
Which construction suits your priorities?
BOYISEN lists solid steel, METOWARE lists high-strength iron with a corrosion-resistant coating, and the Equipment Lock is identified as powder-coated steel. CURT uses an aluminum body. These material descriptions help compare designs, but they do not establish that one lock is impossible to defeat. A kingpin lock is a theft deterrent, not a guarantee against theft.
Do you need a warning tag or easier access?
A warning tag can remind a driver to remove the lock before hitching. METOWARE includes a red tag on a 12-inch chain, and both listed BOYISEN options include warning tags. The BOYISEN handle and outward-facing cylinder are designed to make locking and unlocking more convenient. Choose based on the reminders and access features you will actually use.
How many keys are included?
Key count varies. The BOYISEN models include three keys, while METOWARE lists two. The provided Equipment Lock and CURT features do not state a key count. Keep spare keys in a secure, separate location and confirm included-key details if they matter to your decision.
Frequently Asked Questions
What does a fifth-wheel kingpin lock do?
It attaches to the trailer’s kingpin to deter someone from connecting a compatible hitch and towing the trailer away.
Does a kingpin lock prevent all trailer theft?
No. It is a theft deterrent, not a guarantee. Use it as part of a broader approach to securing an unattended trailer.
Can I leave the lock on while hitching?
No. Remove the lock before connecting the fifth wheel to a towing vehicle. A warning tag may help prevent forgetting it.
Are all fifth-wheel kingpin locks universal?
No. Fit varies by product. Check the stated size or fit range against your trailer’s kingpin before purchasing.
Which option includes the most keys?
The two listed BOYISEN models each include three keys. METOWARE includes two keys; key counts are not stated in the supplied details for CURT or Equipment Lock.