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Bulldog BX1 Round Tube Gooseneck Coupler

Bulldog (Part Number:128904)

Your Price: $175.52
List Price: $215.54
You Save: 19% ($40.02)
Availability: In Stock!
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The Bulldog BX1 coupler is the result of generations of design expertise and field experience. If incorporates innovative features that revolutionize the benefits available from a gooseneck coupler and offers flexible mounting options with its Next Generation locking plate coupler mechanism. These features combine to make hooking up, adjusting vertical height and disconnecting quick and easy. The Next Generation coupler design operates easily with one hand thanks to the new locking handle design, and maintains smooth operation over time with grease fittings for every important operating part. Coupler includes 4-1/2 inch diameter outer tube with 2 set screws, 4 inch diameter inner tube with cast locking plates and 3/4 inch load bearing pin.

  • Note: Requires welding of outer tube to trailer frame.


Ball Size2 5/16 inch
Rating30,000 lbs
Installation InstructionsCLICK HERE


  • Provides continuous tight ball fit with ever-increasing cam tightening locking mechanism
  • Resists theft with integrated feature to allow pad-locking the coupler to the ball (lock not included)
  • Guides ball into socket more easily - bottom locking plate is 50% larger than competitors
  • 22.6" to 30.6" vertical adjustment - 8" total
  • Lengthens life of locking mechanism with oil-impregnated bushing and grease fittings on critical moving parts
  • Includes 4-1/2" outer, 4" inner tubes - unpainted


  • Inner and outer tubes
  • 3/4" load bearing pin

Not Included:


1919 - In a small third floor room over his car dealership in Wausau, Wisconsin, Thomas J. Jacob begins making high-quality precision tools of his own design. His venture becomes known as the Hammer Blow Tool Company. The death of a favorite hunting dog due to an accident involving a poorly-designed trailer hitch leads Jacob to develop the first drop-forged ball-and-socket trailer hitch, which he names the "Never Lets Go" Bull Dog. More inventions follow, positioning Hammer Blow at the forefront of the trailer industry at its infancy.

1930's - Demonstration models of camper trailers built by Jacob at the Chicago World's Fair set off a period of rapid growth in the industry.

1940's - Jacob dies in 1945. His wife, Lula, takes over Hammer Blow and guides it with great success for more than 20 years.

1960's - In 1967, Lula Jacob sells Hammer Blow to Neway Equipment Company of Muskegon, Michigan, which later sells to Lear Siegler, Inc.

1970's - In 1977, private investors led by Thomas J. Reinhart purchase and rename The HammerBlow Corporation. Expansion of the mechanical jack line and related products continues for more than a decade.

The above information has been provided by the Manufacturer, and we cannot guarantee the accuracy thereof or endorse the opinions expressed.

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