Trimax trailer hitch lock for 1-7/8"–2-5/16" couplers, dual-ratchet 360° tamper-resistant

The Trimax UMAX 50D is a heavy-duty trailer hitch lock that secures 1-7/8" to 2-5/16" couplers with a dual-ratchet, 360° tamper-resistant design.

If you move trailers, equipment, or tow recreational vehicles, a dependable coupler lock reduces theft risk and gives you peace of mind at storage yards, campsites, and job sites. The UMAX 50D combines a dual-ratchet mechanism and full-coverage construction so the locking hardware resists prying, hammering, and casual tampering while remaining simple to install and remove.

How does the dual-ratchet system improve security?

The dual-ratchet system uses two interlocking ratchets that tighten around the coupler, which creates a firmer, more tamper-resistant connection than single-point locks. That redundancy increases force distribution and makes it far harder for thieves to shift or lever the lock free.

• Two ratchets clamp simultaneously for tighter fit
• Reduces leverage points thieves normally exploit
• Maintains grip under vibration and movement

Can this lock fit different coupler sizes and needs?

The UMAX 50D is engineered to work with the most common coupler diameters, covering a practical range from 1-7/8" up to 2-5/16". It also converts between a coupler lock and a U-style lock for flexible use on trailers, equipment, or other assets that need a solid physical deterrent.

• Adjustable fit for 1-7/8" to 2-5/16" couplers
• Switches between coupler lock and U-lock modes
• Compact enough for storage but robust for daily use

What protection does the 360° coverage provide?

The design envelopes the coupling point so that cutting, prying, or hammering attempts encounter a continuous shield rather than exposed fasteners. By covering all sides, the lock minimizes attack surfaces and slows down forced entry, which deters opportunistic theft.

• Full-wrap construction blocks pry and hammer access
• Concealed fasteners reduce cut-and-remove spots
• Low profile discourages attack with common tools

How does it hold up to weather and long-term use?

Trimax included a weather-resistant keyhole cover and corrosion-resistant finishes so the lock keeps functioning through rain, dirt, and seasonal storage. The mechanisms are built for repeated use, and the product is supported by a limited lifetime warranty that covers manufacturing defects.

• Keyhole cover prevents dirt and corrosion
• Durable materials resist rust and wear
• Backed by a limited lifetime warranty for defects

Who is this for? The Trimax UMAX 50D is for trailer owners, fleet managers, contractors, and outdoor enthusiasts who need a robust, adaptable coupler locking solution. If you want an easy-to-operate device that fits common coupler sizes, resists attack from multiple angles, and can serve as both a coupler lock and a U-lock, the UMAX 50D offers a practical balance of convenience and deterrence without specialized tools or installation.