2 5/16" Trailer Coupler Locks

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Finding the right trailer lock starts with knowing your coupler size — and for millions of American trailers, that size is 2-5/16". This is the standard ball size for RVs, horse trailers, car haulers, travel trailers, and heavy equipment trailers rated above 6,000 lbs. If that's your setup, you're in the right place. Proven Industries manufactures a full line of 2-5/16" trailer coupler locks designed for a glove-like fit on your specific coupler. That precision matters. A loose-fitting lock leaves clearance that a pry bar or wrench can exploit in seconds. Our locks are machined to eliminate that gap entirely — the lock body wraps your coupler latch with no room to work with, and the Cobra lock core ensures it can't be opened without your key. These aren't off-the-shelf universal locks. We build models for standard ball-style couplers, Atwood flat nose couplers, Jayco travel trailers, Airstream travel trailers, and other specialty fitments. If you tow a horse trailer to weekend shows, haul equipment to job sites, or take your RV out seasonally, there's a model in this collection built specifically for your trailer. All orders placed before 2pm EST ship the same day, and every lock comes backed by our lifetime warranty. Not sure which model fits your trailer? Send us a photo of your coupler and we'll make sure you get the right lock before you order.

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