BOYISEN 5th Wheel King Pin Lock — Solid Steel Anti-Theft Lock with Handle & Warning Tag, Black

BOYISEN 5th Wheel King Pin Lock is a heavy-duty solid-steel anti-theft device for fifth-wheel trailers that features an ergonomic handle, a high-visibility warning tag, and a unique blossom-style keyed cylinder.

If you haul an RV, boat trailer, container, or commercial fifth-wheel, securing the king pin is a top priority. This BOYISEN lock was engineered to make locking and unlocking faster while resisting tampering: a solid-steel body, a turned-out cylinder that accepts a blossom key, and a bright warning tag to remind you before hitching. It replaces fragile cast locks and flat-key designs with a more durable alternative for fleet, dealer, and recreational use.

How does the handle change the locking experience?

The built-in handle repositions the cylinder and provides leverage for one-handed operation, eliminating awkward downward twists beneath the trailer. That design speeds up routine use and reduces fumbling in low light or on uneven ground.

• Handle lets you turn the cylinder outward for easier access
• One-handed operation reduces time spent under the trailer
• Improves grip when wearing gloves or in cold weather

What makes the key and cylinder more secure?

BOYISEN uses a blossom-style cylinder instead of a simple flat key, which resists common pry and break techniques and provides a unique code per lock. The package includes three cut keys so you have a backup on hand without rekeying.

• Blossom-style keys are harder to duplicate and break
• Each lock is keyed unique to avoid cross-opening
• Three keys included for spare or fleet distribution

How robust is the construction for harsh conditions?

The lock body is machined from solid steel rather than a light casting, giving it greater resistance to impact and drill attacks. Corrosion-resistant surfaces and a compact shape make it suitable for long-term outdoor exposure on RVs and commercial trailers.

• Solid steel construction improves strength and longevity
• Designed to resist drills, impacts, and weathering
• Suitable for frequent use in fleet and dealer settings

Will I know the lock is still installed before hitching?

Yes — a bright warning tag is attached to the lock so the driver or operator is visibly reminded to remove the device before attempting to hitch. The tag reduces the chance of costly mistakes and protects both equipment and personnel.

• High-visibility warning tag alerts operators visually
• Tag reduces risk of attempting to hitch with lock in place
• Useful for fleets where multiple drivers use the same trailer

Who is this for? BOYISEN’s 5th Wheel King Pin Lock is designed for RV owners, boat haulers, shipping container operators, fleet managers, and dealership service teams who need a reliable, heavy-duty anti-theft solution. If you want a lock that’s easier to use under the trailer, more resistant to tampering, and visibly obvious when installed, this model fits those needs without complex installation or special tools. The included three keys and unique cylinder coding make it practical for both single owners and fleet deployment, and BOYISEN’s customer support offers refund assistance if expectations aren’t met.