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Master Lock 379DAT Coupler Lock for Trailers

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

379DAT
06/03/2036 8:24 AM
Sale Price

$30.80

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 379DAT is a heavy-duty coupler lock designed to protect trailers, boats, and RVs from theft. This universal coupler lock fits multiple coupler sizes including 1-7/8 inch, 2 inch, and 2-5/16 inch couplers, making it compatible with most standard trailers. It also accommodates Hammerblow and UFP style couplers for versatile protection.

Key Features:

  • Universal fit for 1-7/8", 2", and 2-5/16" trailer couplers
  • Compatible with Hammerblow and UFP style couplers
  • Durable laminated steel frame resists cutting and sawing
  • Protective keyway cover shields lock mechanism from dirt, water, and ice
  • Bright yellow finish provides high visibility as a theft deterrent
  • Locks over the coupler to prevent unauthorized hitching

This coupler lock provides an effective visual deterrent while securing your trailer when parked or stored. The rugged construction and weather-resistant design ensure reliable performance in all conditions, making it ideal for protecting boats, utility trailers, RVs, and cargo trailers.

Products specifications

Coupler Lock Finish

Black powdercoated

Coupler Lock Material

Steel

Lock Type

Adjustable coupler lock

Locking Keys Included

Yes

Quantity

Sold individually.

Quick and easy!

Would buy again

It would be nice to know when the delivery date will be

very fast and efficient

What is the cleaning instructions on these? These are hard to find anymore and fit my son's old truck perfectly!

Awesome!

The part was exactly what I needed and got it in 2 days.

I received the product within a week and it was exactly what I needed.

All good so far

Exactly what I ordered for the best price and fast, too!

Shipped very quickly and had the best price I could find!

Im very satisfied with how fast i received my product from Autoplicity! The whole process was hassle free. If you looking for quality product for a great price than i would recommend Autoplicity!

Really easy Internet shopping from my smartphone

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