Trimax Trailer Receiver Lock 5/8 in Dia x 3-1/4 in Span — Resettable Combination, Weather-Resistant

If you tow a trailer, camper, ATV carrier or heavy equipment on a regular basis, protecting the hitch pin is one of the simplest ways to deter opportunistic theft. The Trimax receiver lock replaces a standard hitch pin with a 5/8" diameter, 3-1/4" span lock that fits most Class III, IV, and V receivers. It uses a user-settable combination so you never need to carry or replace keys, and it’s built with corrosion-resistant materials plus a protective cover to stand up to outdoor use.

Will this lock fit my trailer hitch?

The Trimax lock is designed to fit common heavy-duty receiver sizes. It’s compatible with Class III, IV and V hitch receivers that accept a 5/8" diameter pin and have a span near 3-1/4" between the receiver walls. Measure your existing pin diameter and the inside span of your receiver to confirm fit before purchasing.

• Pin diameter: 5/8" (standard heavy-duty size)
• Span: 3-1/4" between receiver walls
• Fits: Class III, IV, V hitches used on trailers, campers, and haulers
• Quick check: compare to your current hitch pin measurements

How do I set and change the combination?

Setting a new combination is straightforward and requires no special tools. The mechanism is resettable so you can choose a memorable code, and you can change it again later if needed for added security or to share temporary access with someone else.

• Factory code available in instructions to begin setup
• Follow the included reset steps to program a personal code
• Changeable any time without disassembly
• No keys means fewer lost-key hassles or extra key copies

How well does it stand up to weather and outdoor use?

Trimax engineered the lock for exterior durability: the body uses rust-resistant materials, and the lock head includes a protective cover to keep out dirt and moisture. That combination helps preserve the combination mechanism and maintains reliable operation season after season.

• Non-corrosive construction resists rust in wet environments
• Protective weather cover shields dials and moving parts
• Solid-pin design reduces exposure of vulnerable components
• Designed for routine outdoor towing and storage conditions

What level of theft deterrence does this provide?

While no mechanical device is entirely theft-proof, a secure receiver lock like this raises the difficulty level for casual thieves and some determined offenders. The keyless, hardened pin and covered lock head make quick-access theft attempts less likely and add a visible obstacle that can discourage opportunistic theft.

• Hardened 5/8" pin increases cutting and removal resistance
• Combination mechanism prevents easy picking or key duplication
• Visible, robust lock acts as a deterrent to would-be thieves
• Best used with common-sense security: park in well-lit areas and use wheel/tongue locks for added protection

Who is this for: The Trimax resettable receiver lock is ideal for owners of trailers, campers, work haulers, and heavy-duty tow vehicles who want a convenient, keyless way to secure their hitch. It's particularly useful for those who tow frequently, manage multiple vehicles, or prefer a weatherproof, resettable combination instead of carrying spare keys. If you need reliable fitment for Class III–V receivers and prefer to set your own code, this lock provides a practical mix of durability and everyday usability.