CURT 2024122233 Helux Coil-Spring 5th Wheel Pin Box, 4,000 lbs. Pin Weight, 24,000 lbs. Weight CapacityCURT$1,595.95In Stock
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| Warranty | Limited lifetime warranty; one-year finish and parts |
| Finish Type | Black |
| Material Type | Carbon Steel |
| Pin Weight Capacity | 6,000 lbs |
| Total Weight Capacity | 24,000 lbs |
The CURT Helux 5th Wheel Pin Box redefines towing comfort with advanced coil spring and shock absorber technology. Designed to replace standard pin boxes, it minimizes chucking, jarring, and bouncing during travel, ensuring a smoother ride for both driver and passengers.
Its innovative design also protects your RVs gear and belongings by reducing aggressive shifting. This pin box enhances ride quality for pets and passengers by eliminating excessive rattling and vibrations from road hazards.
Its premium steel construction, paired with a durable black powder coat finish, ensures long-lasting reliability for miles of towing. Maintenance-free coil spring technology provides dependable performance without the hassle of upkeep, outperforming traditional air systems.
Approved for use on Lippert frames, the CURT Helux Pin Box offers a smoother hitching experience for seamless towing. Its robust engineering reduces wear and tear on RV hardware, making it a smarter, worry-free choice for your towing needs. Whether for long trips or local getaways, this pin box delivers comfort and performance you can rely on.
CURT offers a variety of high-quality trailer hitches and accessories for select vehicle models. Find the perfect fit for your towing needs at TowUniverse.
CURT, a Lippert brand, offers a complete line of towing products and is the leading manufacturer of custom-fit trailer hitches. We offer the broadest selection of custom-fit hitches, and each one is designed, welded, and coated in Wisconsin.
CURT is also a leader in flat towing products, as well as 5th wheel, gooseneck, and weight distribution hitches, ball mounts, electrical components, cargo solutions, and other towing accessories.
For everything from passenger cars and vans to full-size pickups and SUVs, CURT is 'The First Name in Towing Products®.'
Experts available to answer your questions
Call 888-634-9494One-Year
The Curt Helux Pin Box is a replacement fifth wheel hitch pin box assembly that connects a fifth wheel trailer to a tow vehicle. It uses a spring-loaded jaw mechanism to grip the kingpin on the trailer's pin box. The product is available in seven different models (part numbers 2024044568 through 2024044572), each rated for different pin weight capacities ranging from 1880 lb to 6000 lb when fully loaded.
You must determine your trailer's pin weight before purchasing. The pin weight is the downward force the trailer exerts on the hitch. The most accurate method is to take your fully loaded fifth wheel (including all cargo, ATVs, motorcycles, water tanks, etc.) to a certified scale such as a CAT Scale. Weigh the tow vehicle and trailer together, then weigh the tow vehicle alone, and subtract to find the pin weight. Alternatively, multiply your trailer's GVWR by 22% (0.22) for an approximate pin weight. Match your pin weight to the appropriate model: 2024044568 (1880–2377 lb), 2024044567 (2378–2722 lb), 2024044569 (2723–3165 lb), 2024122233 (3166–3712 lb), 2024044570 (3713–4332 lb), 2024044571 (4333–4900 lb), or 2024044572 (4901–6000 lb).
Yes, but the pin box is designed to operate within specific loaded and unloaded weight ranges. Each model has a minimum pin weight (unloaded, with empty water tanks) and a maximum pin weight (fully loaded). For example, part number 2024044572 has a minimum pin weight of 3290 lb and a maximum of 6200 lb. The pin box will function across this range, but you must select the model whose range includes your actual loaded pin weight. If your loaded pin weight falls outside a model's range, you risk improper hitch operation.
You will need: SAE socket set, SAE wrenches, tape measure, box-end wrench set, safety glasses, air compressor, and level. Proper tools will improve installation quality and reduce installation time.
The kit includes 10 hex bolts (5/8"-11 x 1 3/4", grade 5) and 10 serrated-flange nuts (5/8"-11, grade 5). These fasteners are used to mount the pin box assembly to the trailer. Do not reuse the mounting hardware from your previous pin box; you must use the new hardware included in the kit.
A minimum of two people are required to help support the weight of the pin box as it is being lifted and positioned. The pin box assembly weighs several hundred pounds. A forklift may be used to lift the pin box into position as an alternative.
The manual does not specify battery disconnection or other vehicle preparation steps. However, you must properly support the pin box before removing the old one to prevent death, serious injury, or property damage. Consult the manual's installation steps and your hitch manufacturer's instructions for complete preparation guidance.
The pin box must be installed at a specific height to ensure proper hitching. First, level your trailer front-to-back and measure from the ground to the bottom of the kingpin plate on your current pin box (call this dimension A). The new Helux pin box should be positioned so that the distance from the ground to the flat plate of the upper jaw equals A plus 9-1/2 inches. This ensures the kingpin will seat correctly in the hitch jaws.
No. Do not reuse the mounting hardware from the previous pin box. You must use the new hardware included in the kit: 10 hex bolts (5/8"-11 x 1 3/4", grade 5) and 10 serrated-flange nuts (5/8"-11, grade 5). Use an equal number of fasteners as were previously used to mount the old pin box.
1. Level the trailer front-to-back and measure from the ground to the bottom of the kingpin plate on the current pin box (dimension A). 2. Properly support the old pin box before removing fasteners to prevent injury or damage. 3. Remove the fasteners and carefully lower the old pin box to the ground. 4. Lift the new pin box and support it while positioning it at the correct height (ground to upper jaw flat plate = A + 9-1/2 inches). 5. Secure the new pin box with the supplied hardware kit, using an equal number of fasteners as the old pin box. 6. Torque all 5/8" bolts to 120 ft-lb ± 5 lb.
All 5/8" hex bolts must be torqued to 120 ft-lb ± 5 lb. This torque specification is critical to ensure the pin box is securely attached to the trailer and to prevent damage to the product or vehicle.
After installation, you must perform a hitching and pull test to verify proper operation. First, adjust the trailer height using the landing gear so the bottom of the trailer's pin box is 1/2" to 1" below the hitch skid plate. Then, back the truck slowly toward the trailer until the kingpin slides into the receiver and the hitch closes. Finally, perform a pull test: chock the trailer wheels, apply the trailer brakes, and slowly pull forward. If properly hitched, the trailer should not move. If the trailer separates, repeat the hitching procedure.
The bottom of the trailer's pin box should be positioned 1/2" to 1" below the top of the hitch skid plate. This positioning ensures the kingpin will slide into the receiver correctly and rest fully inside the jaw. If the kingpin is too high, it may rest on top of the closed jaws instead of inside them, which could result in the trailer separating from the hitch.
Use the trailer's landing gear to adjust the trailer height per the manufacturer's recommendation so the bottom of the trailer's pin box is 1/2" to 1" below the hitch skid plate. Do not attempt to hitch the trailer by using trailer jacks to lower the trailer and kingpin, as this could result in the kingpin resting on top of the skid plate instead of within the hitch opening, which may result in death or serious injury.
The pull test verifies that the trailer is properly hitched before traveling. After hitching, chock the trailer wheels, engage the tow vehicle's emergency brake, apply the trailer brakes, and slowly pull the tow vehicle forward. If properly hitched, the wheel blocks and trailer brakes should keep the truck from moving forward. If the trailer is not properly hitched, the trailer will separate from the hitch and the truck will move forward while leaving the trailer behind. Failure to perform a pull test may result in severe property damage, serious personal injury, or death.
After a successful pull test, fully raise the landing gear per the manufacturer's recommendations. Then check and inspect all electrical circuits for proper operation, including clearance lights, turn signals, and stop lights. Finally, remove and store all trailer wheel blocks. Before traveling, ensure the trailer pulls in a level condition.
Always check the pin box and its components for damage or any loose nuts and bolts. Be sure the trailer pulls in a level condition before traveling. The manual recommends consulting the Service Manual for replaceable parts and additional troubleshooting guidance (accessible via QR code on page 5). If you observe excessive noise, verify the pin box is securely attached, check the coil spring condition, inspect the shock absorber, and ensure cargo is balanced.
Never exceed the vehicle manufacturer's recommended towing capacity. The Curt Helux Pin Box is designed to support specific pin weight ranges, but your tow vehicle has its own maximum towing capacity. You must respect both limits: the pin box's weight rating and your vehicle's manufacturer specifications.
Safety glasses should be worn at all times while installing the Curt Helux Pin Box to protect your eyes from debris, fasteners, and other hazards that may occur during the installation process.
No. Returns will not be accepted once the product has been installed. This is why it is critical to verify you have ordered the correct model for your trailer's pin weight before purchase. Measure your pin weight at a certified scale or calculate it using the GVWR method before ordering.
The Curt Helux Pin Box is available in seven models for pin weights from 1880 lb to 6000 lb. You must determine your trailer's loaded pin weight using a certified scale or by multiplying GVWR by 22%. Match your pin weight to the correct model before purchase; returns are not accepted after installation.
You need SAE socket set, SAE wrenches, tape measure, box-end wrench set, safety glasses, air compressor, and level. The kit includes 10 hex bolts (5/8"-11 x 1 3/4") and 10 serrated-flange nuts (5/8"-11). Do not reuse old mounting hardware.
A minimum of two people are required to support the weight of the pin box during installation. The assembly weighs several hundred pounds. A forklift may be used as an alternative.
Torque all 5/8" hex bolts to 120 ft-lb ± 5 lb. Use an equal number of fasteners as were previously used on the old pin box.
Perform a pull test: chock the trailer wheels, apply brakes, and slowly pull forward to verify the trailer is properly hitched. Check all electrical circuits (lights, signals). Ensure the trailer pulls level. Verify the pin box bottom is 1/2" to 1" below the hitch skid plate.
Adjust the pin box mounting height, the tow vehicle height, or suspension as necessary to achieve a level towing condition. The fifth wheel should always be towed while level. If the issue persists after adjusting the pin box height per installation instructions, consult your tow vehicle manufacturer or a suspension specialist.
Check the following: (1) Verify the pin box is securely attached to the trailer by checking all bolts are torqued to 120 ft-lb ± 5 lb. (2) Inspect the coil spring for damage or breakage and replace if needed. (3) Check the shock absorber for damage or disconnection; reconnect or replace if needed. (4) If the kingpin is excessively worn, the jaw plate will need to be replaced. (5) Verify the noise is not coming from the hitch itself by consulting the hitch manufacturer's guidelines.
This is normal behavior. The pin box will close down as the trailer is loaded to the proper pin weight. Observe the pin box and hitch plate once the trailer is fully loaded; it should close to the correct position. If the pin box remains excessively open when fully loaded, the pin box may not be the correct model for your trailer's pin weight.
Excessive chucking (movement or bouncing) can be caused by: (1) Damage to the pin box coil spring—inspect it for condition and damage, and replace if necessary. (2) Unbalanced cargo—ensure cargo is balanced from side to side and front to back in the trailer. Rebalance the load and retest.
If the trailer separates from the hitch during the pull test, the trailer is not properly hitched. Stop immediately and repeat the hitching procedure from the beginning. Ensure the trailer height is adjusted so the bottom of the pin box is 1/2" to 1" below the hitch skid plate, back the truck slowly until the kingpin slides into the receiver, and verify the hitch is latched in the closed position per the hitch manufacturer's instructions.
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