Master Lock 379KA-6 Keyed Alike Universal Trailer Coupler Locks – 6-Pack, 12 Keys

Secure, convenient protection for your trailers

Guard unattended trailers with a practical set from Master Lock. The 379KA-6 is a 6-pack of Keyed Alike Universal Trailer Coupler Locks that lets you secure multiple connections using a single key. Each lock ships with two keys, giving you twelve keys in total to keep handy for crew, storage yards, or rental fleets. The design emphasizes ease of use without sacrificing reliability, helping you streamline daily checks and secure storage in varied conditions.

Key benefits at a glance

• Single-key convenience across six locks, reducing key clutter and confusion.
• Sturdy reinforced zinc die-cast construction for rust resistance and long-term durability.
• Keyed-alike security with a rekeyable cylinder designed to resist picking and prying.
• Fits common trailer couplers—1-7/8", 2", and 2-5/16" from major brands.

What you get

• Six keyed-alike trailer locks
• Two keys per lock (total of twelve keys)
• Limited Lifetime warranty
• Locking design rests on top of the coupler for a tamper-resistant barrier
• Rekeyable cylinder with enhanced security features
• Rugged zinc die-cast housing for rust and wear resistance
• Weight approximately 2.4 lbs per lock for a substantial, confidence-inspiring feel

Durability, ease of use, and compatibility

The 379KA-6 blends robust materials with a practical shape to balance security and everyday use. The zinc die-cast housing offers impressive strength and weather resistance, while the keys are simple to manage across six locks. When engaged, the lock sits above the coupler, creating a straightforward barrier that remains out of the way during hitching and towing. The design also incorporates a rotating feature that adds a bit of complexity for anyone seeking to tamper with the lock, without complicating legitimate operation.

Warranty and ordering notes

Master Lock backs this set with a Limited Lifetime warranty, underscoring confidence in long-term performance. Compatibility covers most 1-7/8", 2", and 2-5/16" trailer couplers from Reese, Fulton, Valley, Atwood, Shelby, Putnam, Hammerblow, Dutton, Lainson, UFP, and other major brands. If you purchase more than one six-pack, be aware they may not be automatically keyed alike; for consistent 12-key keyed-alike across packs, consider direct ordering through the merchant offering keyed-alike across multiple units.