Trimax UMAX 50D Trailer Hitch Lock — Fits 1-7/8" to 2-5/16" Couplers, Dual-Ratchet 360° Protection

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° protective design.

The UMAX 50D combines a versatile coupler fit with a robust, tamper-resistant locking mechanism engineered to keep trailers, equipment, and cargo protected during storage or transport. Built for homeowners, contractors, and recreational vehicle owners, this lock doubles as a coupler lock and U-lock, delivering added security and peace of mind in a compact package. Weather-resistant components and a covered keyhole extend service life, while a limited lifetime warranty backs the product.

How does the dual ratchet system improve trailer security?

The dual ratchet design uses two interlocking ratchet points that clamp the lock tightly around the coupler, reducing play and preventing easy removal. Because it locks in place at multiple contact points, attempts to twist or pry the coupler free encounter greater resistance than single-point locks.

• Two ratchet contact points for reduced movement and higher tamper resistance
• Heavy-gauge steel components resist bending and shear forces
• Secure, positive engagement that stays tight during transport

Will this fit my trailer’s coupler size and styles?

The UMAX 50D fits the common coupler sizes from 1-7/8" up to 2-5/16", accommodating most small to medium trailers and many utility or boat tow setups. Its adaptable shape lets it function as both a coupler lock and a U-style lock for other equipment, increasing usability across different trailers and gear.

• Compatible with couplers in the 1-7/8" to 2-5/16" range
• Multi-use form factor works on chains, axles, or other anchor points
• Adjustable engagement for various coupler profiles and shapes

How does the UMAX 50D stand up to weather and tampering?

Trimax engineered this lock with 360° protection and a covered keyhole to keep out dirt, moisture, and corrosive elements that reduce reliability. The full-coverage design shields vulnerable seams from pry tools and hammer strikes, while the keyhole cover preserves smooth operation in wet or dirty conditions.

• 360-degree shielding against prying, hammering, and direct attack
• Weather-resistant keyhole cover prevents corrosion and debris buildup
• Durable finishes and sealed components extend service life outdoors

What practical benefits will I notice during everyday use?

Expect a simpler locking routine and fewer worries about trailer theft or accidental uncoupling. The versatile design and straightforward ratchet action make securing and removing the lock quick, while the sturdy construction reduces long-term maintenance and replacement needs.

• Fast ratchet engagement for quick installation and removal
• One device that can secure couplers, chains, or other gear
• Backed by a limited lifetime warranty for long-term value

Who is this for? The Trimax UMAX 50D is aimed at trailer owners who need a dependable, low-fuss security solution—recreational boaters, landscapers, tradespeople, and anyone who parks trailers in public or unattended locations. If you want a lock that adapts to most common couplers, resists weather and tampering, and serves double duty as a U-lock for other equipment, the UMAX 50D delivers practical protection without complex installation.