RVMATE 5th Wheel King Pin Lock - Yellow Heavy-Duty Steel, Universal Fit

RVMATE's 5th Wheel Lock is a heavy‑duty steel king pin lock that physically blocks trailer coupling and provides a highly visible theft deterrent.

Designed for semi trailers, fifth wheels, trucks and other towable equipment, this lock combines robust construction with a bright yellow warning tag so your trailer is both protected and clearly marked as secured. Its universal fit and weather‑resistant finish make it a practical choice for long‑term use on busy yards, storage lots, campgrounds and in transit.

How does this lock stop unauthorized hookups?

The lock fits over the trailer king pin and prevents the king pin from seating into a hitch, making it impossible to couple a truck without removing the device. The bright yellow tag acts as an immediate visual cue to would‑be thieves or opportunistic users that the trailer is secured.

• Blocks physical connection to fifth‑wheel hitches
• Highly visible yellow tag reduces temptation for theft
• Requires the supplied key to disengage

Will this fit my trailer’s king pin?

The RVMATE king pin lock is made to fit standard trailer pins, with an internal diameter sized to accept a 50 mm diameter king pin. Its 83 mm overall height accommodates the typical dimensions found on most fifth wheels, making it broadly compatible across trailers.

• Internal diameter: 74 mm designed for 50 mm pins
• Overall height: 83 mm for common king pin sizes
• Suitable for fifth wheels, semi trailers, trucks, boats, and containers

What materials and finish protect this lock outdoors?

The lock is constructed from heavy‑duty welded steel with brass/copper components in the cylinder area and an electrostatically applied finish. That combination resists rust, stands up to weather exposure and makes the unit difficult to cut or force open.

• Welded heavy‑duty steel body for strength
• Electrostatic coating for weather and rust resistance
• Robust cylinder design increases tamper resistance

How simple is it to install and remove?

Installation requires only placing the lock over the king pin and turning the included key 180 degrees to lock it in place. Removal is the reverse; note that each lock comes with its own unique key and keys are not interchangeable between individual units.

• Engage over king pin, insert key, rotate 180° to lock
• Quick removal with the matching key for routine use
• Includes fluorescent warning tag attached by chain for visibility

Who this is for: RVMATE’s 5th Wheel Lock is aimed at fleet managers, RV owners, haulers and storage operators who need a rugged, easy‑to‑use physical deterrent. If you want to prevent unauthorized towing, add a clear visual warning and use a lock that tolerates outdoor conditions, this product offers a straightforward, cost‑effective solution.