RVMATE 5th Wheel King Pin Lock Yellow — Heavy-Duty Steel, Visible Anti-Theft

The RVMATE 5th Wheel Lock is a heavy‑duty steel king pin lock with a high‑visibility yellow finish that blocks trailer coupling and deters theft.

Designed for owners of fifth wheels, semi trailers and other trailer types, this king pin lock prevents unauthorized attachment by physically covering the king pin and sending a clear visible warning. Constructed from thick welded steel with a weather‑resistant electrostatic coating and paired with a fluorescent warning tag, the unit balances rugged protection with on‑site visibility so would‑be thieves are less likely to attempt a theft.

How does this lock stop thieves from hooking up my trailer?

By enclosing the king pin and locking in place, the RVMATE unit makes it mechanically impossible to couple the trailer to a tractor without first removing the lock. The bright yellow housing and dangling caution tag also act as an immediate visual deterrent that signals the trailer is secured.

• Physical barrier that prevents trailer coupling
• Visible yellow finish and fluorescent tag warn passersby
• Sturdy welded construction resists tampering attempts
• Each lock ships with its own unique key for individual security

Will it fit my king pin and what are the dimensions?

The RVMATE king pin lock is sized to accommodate standard 50 mm diameter trailer pins. With an overall height of 83 mm and an internal diameter of approximately 74 mm, it delivers a universal fit for most commercial and recreational fifth‑wheel applications.

• Internal diameter ~74 mm — fits 50 mm pins
• Total height 83 mm for ample coverage
• Works on semi trailers, fifth wheels, trucks, boats and containers
• Simple visual check confirms proper seating when installed

How durable is the construction and how does it stand up to the elements?

Built from heavy gauge steel with welded joins, the lock is finished with an electrostatic coating to resist rust and fading. That combination provides a corrosion‑resistant exterior and a rigid internal structure intended to increase the time and effort a thief would need to defeat it.

• Welded heavy‑duty steel body for strength
• Electrostatic surface treatment for weather resistance
• Hard to cut or pry without specialized tools
• Bright finish reduces need for frequent visual inspection

How easy is it to install and remove day to day?

Installation is straightforward: place the lock over the king pin, insert the key into the cylinder and rotate to lock. Removal follows the reverse steps; every unit includes its own set of keys, so locks do not share keys across different units.

• Quick 180° key turn to engage or release
• Tool‑free installation for fast use on the road
• Distinct keys per lock for individualized security
• Clear visual confirmation when properly locked

Who is this for? RVMATE’s 5th Wheel King Pin Lock is intended for RV owners, fleet managers, truckers and anyone who parks trailers in public areas and needs a straightforward, rugged deterrent against unauthorized hookup. It’s a practical choice when you want a visible, mechanical solution to reduce theft risk without complex installation or ongoing maintenance.