Description
Heavy Duty Square Trailer Jack – 12,000 lb Support / 10,000 lb Lift | Front Pin | Spring Return | Weld-On | Part #40-412
Built to handle demanding trailer applications, this Heavy Duty 12,000 lb Square Trailer Jack delivers unmatched strength, smooth operation, and long-term reliability. Designed with a 4″ square tube body, weld-on mounting, and front pull pin, this jack is engineered for serious work trailers including goosenecks, equipment trailers, dump trailers, and agricultural trailers.
The twin thrust bearing design ensures smooth expansion and retraction, while the spring return feature allows the jack to retract quickly when released. A large 3/4″ pull pin makes operation easy even under load. Built-in grease zerk fittings simplify maintenance, ensuring long service life.
A tough exterior-grade black painted finish offers superior corrosion resistance, and the beveled shaft design removes sharp edges for added safety. A built-in footpad increases surface stability on a variety of trailer setups.
Key Features
- 12,000 lb support capacity / 10,000 lb lift capacity
- Heavy duty 4″ square weld-on body
- Front pull pin with quick spring return function
- Twin thrust bearings for smooth raising and lowering
- Grease zerks for easy maintenance
- Durable black painted finish for corrosion resistance
- Footpad included for added stability
- Includes handle and handle clip
Specifications
- Capacity: 12,000 lb support / 10,000 lb lift
- Style: Heavy Duty Square Weld-On
- Tube Size: 4″ square
- Pin: 3/4″ front pull pin
- Extended Length: 54″
- Finish: Exterior-grade black paint
- Includes: Handle + clip, footpad
- Reference #: 40-412
Ideal For: Equipment trailers, dump trailers, gooseneck trailers, commercial trailers, and agricultural applications.
Frequently Asked Questions
- What is the capacity of this jack?
- This jack has a 12,000 lb support capacity and a 10,000 lb lift capacity.
- Is this jack weld-on or bolt-on?
- This is a heavy duty weld-on square jack designed for permanent installation.
- Does this jack have spring return?
- Yes, it features a spring return system activated by a large 3/4 inch pull pin for fast retraction.
- Does it include a footpad and handle?
- Yes, this jack includes a footpad for added stability, along with a handle and handle clip.
- Is this jack easy to maintain?
- Yes, it includes built-in grease zerk fittings for simple lubrication and long service life.
Looking for a reliable Trailer Jack? You’re in the right place. TowParts offers premium replacement parts for your trailer.
Why Choose Our Trailer Jack for Your Trailer?
When it comes to towing safety and reliability, selecting the right Trailer Jack is absolutely critical. At TowParts, we understand that whether you are hauling heavy equipment, a recreational vehicle, or a simple utility trailer, every component plays a vital role in your journey. Our Heavy Duty Square Trailer Jack – 12,000 lb Support / 10,000 lb Lift – Front Pin is engineered to meet the highest industry standards, ensuring that you can tow with complete peace of mind.
Uncompromising Quality and Durability
Trailer parts face immense stress, weather exposure, and constant vibration on the road. That is why our Trailer Jack selection features heavy-duty materials designed to resist wear, tear, and corrosion. By upgrading to premium components, you significantly reduce the risk of on-road failures and extend the lifespan of your trailer. Regular maintenance combined with high-quality replacement parts is the secret to a trailer that lasts for decades.
The Importance of Proper Trailer Maintenance
Ignoring worn-out components can lead to catastrophic failures. We highly recommend inspecting your Trailer Jack regularly. Look for signs of stress, rust, or mechanical fatigue. Replacing a compromised Trailer Jack before your next long trip is a small investment that guarantees the safety of your cargo, your vehicle, and other drivers on the road. Always ensure that your replacement parts match your axle’s weight capacity and specifications.
Expert Support from TowParts
Finding the correct replacement part can sometimes be confusing, but TowParts is here to help. We pride ourselves on providing not just top-tier parts like the Heavy Duty Square Trailer Jack – 12,000 lb Support / 10,000 lb Lift – Front Pin, but also the expertise you need to get the job done right. We source directly from trusted manufacturers to bring you professional-grade trailer parts at competitive wholesale and retail prices.
Upgrade your setup today with the best Trailer Jack on the market and experience the difference that true quality makes. Safe towing starts with reliable parts, and TowParts is your dedicated partner for the long haul.

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