BOYISEN 5th Wheel King Pin Lock — Solid Steel Security, Ergonomic Handle & Warning Tag

BOYISEN 5th Wheel King Pin Lock is a heavy-duty solid-steel trailer kingpin lock with an ergonomic handle, blossom locking mechanism, and high-visibility warning tag to secure your fifth-wheel trailer.

Designed for owners of RVs, campers, boats on fifth-wheel trailers and commercial semi-trucks, this upgraded king pin lock focuses on practicality and theft deterrence. It uses a hardened steel body and a blossom-style internal lock to resist tampering and drill attacks, while the outward-turned cylinder and built-in handle make locking and unlocking quicker and safer. The bright warning tag reduces the chance of attempting to hitch with the lock still in place.

How does this king pin lock improve day-to-day use?

The BOYISEN lock adds an ergonomic handle and reorients the locking cylinder outward so you can install and remove it without awkward hand positions. The changes save a few minutes each time you secure or release the trailer, which is especially helpful for drivers who handle hitching frequently.

• Handle for easier grip and torque when turning the lock.
• Outward-facing cylinder reduces bending and improves access in tight spaces.
• Compact form that fits standard king pin dimensions for straightforward installation.

What makes its security features reliable against theft?

Security combines material strength with lock design. The solid steel exterior is drill resistant and corrosion protected, while the blossom lock mechanism prevents common pry-and-lift techniques, offering a higher level of tamper resistance than basic cylinder locks.

• Solid steel construction reduces cutting and bending risks.
• Blossom lock design protects the shackle area from prying tools.
• Coated finish helps prevent rust and maintains integrity in harsh weather.

Will this fit my fifth-wheel king pin and what are its dimensions?

The BOYISEN lock is sized to match standard king pins and is listed with precise measurements so you can confirm fit before purchase. Measure your king pin flange and compare to the listed inner and outer diameters to ensure compatibility.

• Height: 93.5 mm for clearance around the pin head.
• Inner diameter: 74 mm to accept the king pin size.
• External diameter: 150 mm giving full coverage and robust shielding.

What practical accessories and conveniences are included?

The package includes keys and a prominent warning tag that improves both security and safety during hitching operations. BOYISEN provides spare keys and a key ID system to help replace lost keys without replacing the entire lock.

• Comes with two keys; later batches include a printed key ID for easy replacement.
• High-visibility warning tag to prevent accidental hitch attempts with the lock installed.
• Durable coated finish for long service life outdoors.

Who is this for? BOYISEN 5th Wheel King Pin Lock is intended for RV owners, fleet operators, trucking companies, dealers, and seasonal campers who need a reliable, easy-to-use anti-theft solution. If you regularly hitch or unhitch trailers and want a visible, heavy-duty lock that simplifies handling while improving tamper resistance, this lock fits those needs. Before ordering, verify your king pin dimensions against the listed sizes to ensure a proper fit.