BOYISEN 5th Wheel King Pin Lock – Solid Steel, Compact 93.5mm Height with Handle and Warning Tag

BOYISEN 5th Wheel King Pin Lock is a heavy-duty, solid-steel hitch lock with a built-in handle and high-visibility warning tag designed to secure standard king pins on RVs, trailers, and semi-trucks.

When you leave a trailer or RV unattended, the king pin area is a common theft target. This BOYISEN lock upgrades traditional king-pin protection by adding a user-friendly handle, a tamper-resistant blossom locking mechanism, and a bright warning tag so you always know the lock is still in place before hitching. Built from solid, drill-resistant steel and finished for weather resistance, it’s meant to add a strong, visible deterrent without complicating day-to-day use.

How does the handle make locking and unlocking easier?

The integrated handle gives you a positive grip for inserting and removing the lock, reducing bending and awkward hand positions compared with downward-facing cylinders. The cylinder orientation has been changed outward to further simplify operation, especially in tight or low-clearance situations.

• Ergonomic handle for quick one-handed operation
• Outward cylinder orientation avoids obstructed access
• Smoother insertion and removal even with gloves on
• Compact height (93.5 mm) fits standard king pins easily

What makes this lock resistant to tampering or drilling?

BOYISEN uses solid steel construction rather than hollow or cast alternatives to increase strength against forced entry. The blossom lock mechanism protects the cylinder from direct drilling and prying attempts, giving thieves a more difficult and time-consuming task.

• Solid, drill-resistant steel body and components
• Blossom-style lock design limits exposure of the cylinder
• Durable finish helps prevent corrosion and long-term wear
• External diameter 150 mm for robust coverage of the king pin

Will this fit my trailer or truck king pin?

The BOYISEN king pin lock is sized to work with standard king pins commonly found on RVs, campers, and semi-trailers. Its internal and external dimensions provide a secure fit while leaving enough clearance to install and remove the device quickly.

• Inner diameter: 74 mm — fits standard king pin shanks
• External diameter: 150 mm — covers and protects the king pin area
• Total height: 93.5 mm — compact, compatible with most 5th-wheel setups
• Universal design suits fleet, RV, boat trailer, and commercial use

What accessories and support come with the lock?

Each BOYISEN lock ships ready to use with keys and a visible tag so you won’t accidentally leave it engaged. Recent production batches include a printed key ID to enable replacement key orders if you misplace your originals.

• Includes one king pin lock and two keys for immediate use
• High-visibility warning tag attached to remind you to remove the lock
• Key ID printed on keys in newer batches for easy key replacement
• Designed for keyed-unique security—each lock uses its own code

Who is this for? BOYISEN 5th Wheel King Pin Lock is suited to RV owners, fleet managers, trucking companies, and anyone who leaves trailers unattended and needs a rugged, straightforward anti-theft solution. If you want a long-lasting, easy-to-use king pin lock with strong tamper resistance and a visible reminder to remove it before hitching, this model balances security and convenience for professional and recreational users alike.