Park your trailer with peace of mind. The Master Lock 605DAT Trailer Coupler Lock drops into a 2 in coupler ball socket and locks it shut — no thief can lift the latch and roll your trailer away. The brass body and 3/4 in shackle resist rust and corrosion through years of outdoor exposure, and the keyed mechanism stays smooth even after a winter sitting in a snowbank.

Why Trailer Owners Pick This Lock

• Fits standard 2 in coupler ball sockets — the most common size on utility, boat, and small enclosed trailers
• Solid brass body resists rust and corrosion in outdoor and marine environments
• 3/4 in (19 mm) hardened-steel shackle bites back against bolt cutters and pry attacks
• Drops into the latch position when the coupler is open — no separate bracket to install
• Includes two keys with a unique key code — replacements available through Master Lock
• Weather-resistant cylinder stays smooth in rain, snow, and freeze-thaw cycles

Where It Shines

• Utility, landscape, and contractor trailers parked overnight on jobsites
• Boat trailers at marina lots and ramps
• RV and travel-trailer storage between trips
• Cargo trailers in driveways and storage yards

Specifications

• Model: 605DAT
• Coupler size: 2 in (50.8 mm) ball socket
• Body material: Solid brass
• Shackle: 3/4 in (19 mm) hardened steel
• Keying: Keyed (two keys included)
• Use: Outdoor / weather-resistant
• Approximate weight: 1 lb

Stop by Garoppo’s to pick one up, or schedule local delivery within our service area.