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Master Lock 377DAT Universal Trailer Coupler Lock Chrome

Manufacturer

Master Lock

<h3>A Century of Security Innovation</h3><p>Since 1921, Master Lock has been synonymous with strength, durability, and uncompromising security. Founded by locksmith-inventor Harry Soref, the company revolutionized the industry with a padlock design that used laminated steel layers to economically produce an exceptionally strong lock body. Now a subsidiary of Fortune Brands Innovations, Master Lock Company LLC is headquartered in Oak Creek, Wisconsin, where it continues to develop security solutions trusted by millions around the world.</p><p>The brand gained widespread recognition through its famous 1974 Super Bowl commercial showing a blast from a high-powered rifle aimed at a padlock—though the bullet pierced the lock, it still functioned, cementing the "Tough Under Fire" slogan in the American consciousness. That commitment to legendary strength remains the foundation of every Master Lock product today.</p><h3>Comprehensive Security Solutions</h3><p>Master Lock's extensive product lineup serves diverse security needs across personal, automotive, commercial, and industrial applications. At the core of the brand's reputation are its <a href="/436-master-lock-locks-200628">locks</a>, which range from classic laminated padlocks and combination locks to cutting-edge Bluetooth-enabled and biometric models. The company added the combination lock to its portfolio in 1935, a model still sold today, and launched Bluetooth-enabled padlocks in 2015, demonstrating Master Lock's ability to honor tradition while embracing innovation.</p><p>Beyond traditional security, Master Lock has expanded into automotive and cargo control solutions. Their <a href="/436-master-lock-tie-strap-and-clip-10142">tie straps and clips</a> help secure loads in truck beds, trailers, and roof racks, featuring innovations like the StrapTrap system that manages excess webbing. For vehicle security, Master Lock offers specialized products including <a href="/436-master-lock-spare-tire-hoist-20541">spare tire hoists</a> and spare tire locks for automobiles, protecting vulnerable external-mounted tires from theft.</p><h3>Built to Last</h3><p>What sets Master Lock apart is not just product innovation but enduring quality. Customer testimonials speak of locks protecting spare tires during 8,300-mile trips to Alaska and combination locks working flawlessly after 64+ years of service with exposure to the elements. This extraordinary longevity stems from Master Lock's commitment to rigorous testing and premium materials, whether it's high-security shackles on padlocks or UV-treated polyester webbing on cargo straps.</p><p>Whether you're securing a storage unit, protecting tools at a job site, locking down cargo, or safeguarding your vehicle's spare tire, Master Lock delivers the authentic, time-tested security that has made it a household name for over a century. When protection matters, professionals and homeowners alike turn to the brand that literally proved it's tough under fire.</p>

Part Number

377DAT
06/03/2036 9:20 AM
Sale Price

$40.27

In Stock (10+)

delivery box

Usually delivered within 2 days

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Master Lock 377DAT is a heavy-duty universal trailer coupler lock designed to secure trailers when disconnected from tow vehicles. This chrome-plated steel lock provides reliable theft protection for trailers with standard ball coupler sizes.

Key Features:

  • Universal fit for 1-7/8" and 2" ball couplers
  • Adjustable design accommodates various trailer coupler makes and models
  • Chrome-plated steel construction resists rust and corrosion
  • Prevents unauthorized hookup and trailer theft
  • Simple installation requires no tools
  • Durable locking mechanism for long-term security

This trailer coupler lock is ideal for boat trailers, utility trailers, RV trailers, and equipment trailers. The adjustable design ensures compatibility with virtually all standard coupler types, making it a versatile security solution for trailer owners.

Products specifications

Coupler Lock Finish

Natural

Coupler Lock Material

Stainless steel

Lock Type

Coupler lock

Locking Keys Included

Yes

Quantity

Sold as a kit.

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