NBJINGYI 8,000 lb Heavy-Duty Weld-On Square Trailer Jack — 28" Lift, Top-Wind Crank, Corrosion-Resistant

NBJINGYI’s 8,000 lbs heavy-duty square trailer jack is a weld-on drop-leg jack with a 28-inch total lift, top-wind crank, and rugged 2.5" square steel construction for stable, long-lasting trailer support.

This weld-on trailer jack is engineered to replace flimsy round jacks and provide a permanent, high-strength lifting solution for utility trailers, equipment haulers, agricultural trailers, and RV tongue boxes. Its dual-stage drop-leg and screw travel deliver a wide 28" range so you can quickly level trailers at different heights while the top-wind handle and grease zerk make operation and upkeep simple. The corrosion-resistant finish and reinforced welded joints are designed to withstand heavy use on job sites, farms, and recreational outings.

How does the 28" total lift make trailer setup faster?

The combination of an internal screw jack and multi-position drop leg gives you a 28" adjustable height span for rapid leveling across varied tongue heights. You can fine-tune height with the screw and then lock the drop leg for coarse adjustments, saving time when hitching or unhitching.

• Dual-stage design: screw travel plus drop-leg extension for wide range
• Drop leg extends from 24.25" to 39.5" for quick coarse adjustments
• Pin-and-clip locking for secure, repeatable positions
• Reduces time and effort during hitching, loading, or vehicle swaps

What makes this jack stronger than a round trailer jack?

The NBJINGYI jack uses 2.5" outer and 2.25" inner square steel tubes with reinforced welds for superior side-load resistance and torsional rigidity. Square tubing resists bending and twisting better than comparable round jacks, delivering a stiffer, safer support under load.

• High-tensile steel construction rated to support 8,000 lbs
• Reinforced weld seams for long-term durability under heavy loads
• Square tube geometry reduces play and side deflection
• Built for utility, agricultural, commercial, and off-road use

How user-friendly is the top-wind operation and maintenance?

The top-wind foldaway crank handle gives comfortable leverage while keeping the profile tidy when not in use. An integrated grease zerk makes routine lubrication fast and clean, preserving smooth screw travel through heavy duty cycles.

• Ergonomic foldaway crank for compact storage and easy turning
• Top-wind mechanism provides straightforward mechanical advantage
• Grease zerk for simple, mess-free maintenance of internal gears
• Pin-and-clip secures drop leg at chosen height during use

Is weld-on installation the right choice for my trailer?

This jack is intended for permanent, weld-on mounting to a trailer frame for maximum stability. A direct weld attachment eliminates wobble and movement common with bolt-on or clamp-style mounting, making it ideal for demanding, repeated loading situations.

• Designed for permanent weld-on installation to trailer frames
• Non-slip footplate enlarges contact area for stable ground support
• Eliminates looseness and movement found with temporary mounts
• Recommended for owners wanting a robust, long-term solution

Who is this for: The NBJINGYI 8,000 lb weld-on square trailer jack suits trailer owners, contractors, farmers, and RV enthusiasts who need a durable, permanent lifting solution that stands up to frequent use. Choose this jack if you want stronger side-load resistance than round jacks, a wide adjustable lift range for different towing setups, and a top-wind design that’s easy to operate and maintain. This product is best installed by someone with welding capability or by a professional fabricator to ensure a secure, lasting attachment to your trailer frame.