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CURT
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Always the correct part
We know our products
Quality Products
Free Shipping!
| Warranty | Limited lifetime warranty; one-year finish and parts |
| Finish Color | Black |
| Construction Material | Carbon Steel |
| Pin Weight Capacity | 5,400 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 pin box assembly for 5th wheel trailers. It connects the trailer's kingpin to the tow vehicle's 5th wheel hitch receiver. The pin box contains a spring mechanism that supports the trailer's weight and allows for articulation during towing. Different models are rated for different pin weights, ranging from 1880 lb to 6000 lb when fully loaded.
You must determine your 5th wheel's actual pin weight before purchasing. The best method is to take your fully loaded 5th wheel (including all cargo, ATVs, motorcycles, etc.) to a certified scale such as 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 5th wheel's GVWR by 22% (0.22) for an approximate pin weight. Match your pin weight to the chart on page 1: part numbers range from 2024044568 (1880–2377 lb) to 2024044572 (4901–6000 lb). The manual notes that actual weight may vary from the approximation, so actual weighing is preferred.
Part number 2024044571 is rated for a pin weight of 4333–4900 lb when loaded. The minimum pin weight (unloaded, with empty tanks) is 2860 lb, and the maximum pin weight (fully loaded) is 5400 lb.
You will need: SAE socket set, SAE wrenches, tape measure, box-end wrench set, safety glasses, air compressor, and level. The manual notes that proper tools will improve installation quality and reduce time required.
The kit includes: 1 pin box assembly, 10 hex bolts (5/8"-11 x 1 3/4", grade 5), and 10 serrated-flange nuts (5/8"-11, grade 5). The manual emphasizes that you must use this new hardware and not reuse the mounting hardware from the previous pin box.
A minimum of two people are required to support the weight of the pin box during installation and removal. The manual states the pin box assembly weighs several hundred pounds. A forklift may be used to lift the pin box into position as an alternative.
Yes. The first step is to level the trailer front-to-back and measure from the ground to the bottom of the kingpin plate on the current pin box. This measurement (dimension A) is used to position the new pin box at the correct height. The manual also notes that the 5th wheel should always be towed while level, and adjustment of the pin box mounting height, tow vehicle height, or suspension may be necessary to achieve a level towing condition.
After leveling the trailer, measure from the ground to the bottom of the kingpin plate on the old pin box and record this as dimension A. When installing the new pin box, measure from the ground up to the flat plate of the upper jaw on the Helux pin box and adjust the height until it equals dimension A plus 9 1/2". This ensures the kingpin will be positioned correctly in the hitch receiver.
No. The manual explicitly states: 'Do not reuse the mounting hardware from the previous pin box.' You must use the new hardware included in the kit, which consists of 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.
Torque the 5/8" bolts to 120 ft-lb ± 5 lb. The manual emphasizes that proper torque requirements should be followed when securing hardware during installation to help prevent damage to the product or vehicle.
Before removing the old pin box, you must properly support it. The manual includes a warning that an unsupported pin box during product removal can result in death, serious personal injury, severe product and/or property damage. Once the pin box is properly supported, remove the fasteners securing it and carefully lower it to the ground.
The bottom of the trailer's pin box should be positioned 1/2" to 1" below the top of the hitch skid plate. Use the trailer landing gear to adjust the trailer height per the manufacturer's recommendation to achieve this clearance. The manual warns that failure to follow these instructions may result in the kingpin being too high and coming to rest on top of closed jaws or not completely inside the jaw, which could result in trailer separation and serious injury or death.
No. The manual explicitly warns: 'Do not attempt to hitch the trailer by using trailer jacks to lower the trailer and kingpin. This could result in the kingpin coming to rest on top of the skid plate instead of within the hitch opening, which may result in death or serious injury.' Instead, use the trailer landing gear to adjust trailer height per the manufacturer's recommendation.
A pull test is a procedure to verify that the trailer is properly hitched to the tow vehicle before traveling. After hitching, you chock the trailer tires, engage the tow vehicle's emergency brake, release the brake, apply the trailer brakes, and slowly pull forward. If properly hitched, the wheel blocks and trailer brakes should keep the truck from moving forward. If the trailer is not properly hitched, it will separate from the hitch. The manual warns that failure to perform a pull test may result in severe property damage, serious personal injury, or death.
Before the pull test, securely chock the trailer tires (place chocks firmly against the front and rear of each trailer tire to prevent forward or backward movement). The trailer landing gear should be firmly on the ground to support the trailer. The tow vehicle must be in park with the emergency brake engaged. The manual warns that failure to secure the tow vehicle and trailer from movement during the procedure could result in severe property damage, serious personal injury, or death.
After successfully performing the 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.
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 also recommends consulting the service manual and replaceable parts guide (accessible via QR code on page 5) for additional troubleshooting and maintenance information.
The 5th wheel should always be towed while level. If the trailer is not level, adjust the pin box mounting height, the tow vehicle height, or suspension as necessary to accomplish a level towing condition. If the trailer is not level during the initial hitching, adjust the pin box or hitch accordingly before traveling.
The manual states: 'Never exceed the vehicle manufacturer's recommended towing capacity.' You must verify your tow vehicle's maximum towing capacity and ensure that your loaded 5th wheel (including all cargo) does not exceed this limit. Exceeding the towing capacity can result in unsafe towing conditions and potential loss of control.
No. The manual states: 'Returns will not be accepted once product has been installed.' This is why purchase verification (confirming the correct pin weight) is critical before ordering.
To register your purchase, get copies of product warranties, or provide feedback, visit warranty.curtgroup.com/surveys. Curt Manufacturing offers industry-leading warranties on their products.
The Curt Helux Pin Box fits 5th wheel trailers with pin weights from 1880 lb to 6000 lb (loaded). You must weigh your fully loaded trailer at a certified scale to determine the correct model. Seven models are available (part numbers 2024044568–2024044572), each rated for a specific pin weight range.
You will need SAE socket set, SAE wrenches, tape measure, box-end wrench set, safety glasses, air compressor, and level. A minimum of two people are required to support the pin box during installation.
You must use the new hardware included in the kit. The manual explicitly states: 'Do not reuse the mounting hardware from the previous pin box.' The kit includes 10 new hex bolts (5/8"-11 x 1 3/4") and 10 serrated-flange nuts (5/8"-11).
Torque the 5/8" bolts to 120 ft-lb ± 5 lb. This is critical to prevent damage to the product or vehicle.
Measure from the ground to the bottom of the old kingpin plate (dimension A), then position the new pin box so the flat plate of the upper jaw is at height A + 9 1/2". During hitching, the bottom of the pin box should be 1/2" to 1" below the hitch skid plate.
Yes. The pull test verifies that the trailer is properly hitched. Chock the tires, engage the emergency brake, then slowly pull forward. If properly hitched, the trailer should not move. The manual warns that failure to perform a pull test may result in severe property damage, serious personal injury, or death.
Adjust the pin box mounting height, the tow vehicle height, or the suspension as necessary to achieve a level towing condition. The 5th wheel should always be towed while level. If the issue persists after these adjustments, consult your hitch manufacturer's owner's manual or contact Curt Manufacturing at 432.547.7378.
Inspect the pin box coil spring for condition and any possible damage. Also ensure that cargo is balanced from side to side and front to back. If the spring is damaged or broken, it will need to be replaced. Consult the service manual (accessible via QR code) for replacement procedures.
First, verify that the pin box is securely attached to the 5th wheel by checking all nuts and bolts. If the kingpin is excessively worn, the jaw plate will need to be replaced. Check the condition of the coil spring and replace if damaged or broken. Look for damage to the shock absorber or a disconnected shock, and reconnect or replace if needed. Also verify that the noise is not coming from the hitch itself by consulting the hitch manufacturer's guidelines.
This is normal behavior. Observe the pin box and hitch plate once the trailer is loaded. The pin box will close down as the unit is loaded to the proper pin weight. This is the spring mechanism functioning as designed.
If the trailer separates from the tow vehicle during the pull test, the trailer is not properly hitched. Repeat the hitching procedure from the beginning. Ensure that the pin box height is correct (bottom of pin box 1/2" to 1" below the hitch skid plate), that the kingpin slides fully into the receiver, and that the 5th wheel hitch is latched in the closed position per the hitch manufacturer's instructions.
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