CURT 24K Helux Coil-Spring 5th Wheel Pin Box, 5,400 lbs. Pin Weight 2024044571CURT$1,655.95In Stock
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Upgrade Your Towing Experience with the CURT Helux Pin Box
Enhance comfort, safety, and durability when towing your 5th wheel RV with the CURT Helux™ Coil-Spring 5th Wheel Pin Box. Designed as a direct replacement for Rhino Box models, this innovative pin box uses proprietary coil and shock technology to reduce chucking and jarring, protecting your trailer, gear, and passengers.
Purchase verification required – Refer to instruction sheet for pin weight measuring process
Reduces force by up to 30% on RV frame and body compared to similar pin boxes
Automotive-grade coil spring delivers a smoother, more stable ride — great for pets and passengers
Virtually maintenance-free — no airbags to refill or parts to tune
Direct bolt-on fit for Rhino Box mounting pattern
Heavy-duty steel construction with corrosion-resistant black powder coat finish
Tested to SAE J2638 safety standards
Made in the USA with global materials
Limited lifetime warranty (1-year finish & parts)
Towing Capacity: Up to 24,000 lbs.
Pin Weight: Max 4,850 lbs. / Min 2,570 lbs.
Compatibility: Lippert RV frames (does not void warranty)
Patent Pending Design
Note:
Not compatible with offset 5th wheel hitches
Includes all necessary mounting hardware
Returns not accepted after installation
Always match towing components to the lowest-rated capacity
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 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 loaded.
You must determine your 5th wheel's pin weight before purchasing. The best method is to take your fully loaded 5th wheel (including all cargo, toys, and water tanks) 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. Match this 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). Alternatively, multiply your 5th wheel's GVWR by 22% (0.22) for an approximate pin weight, though actual weighing is preferred.
No. Returns are not accepted once the product has been installed. Verify your pin weight and confirm you have the correct model before installation begins.
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: one pin box assembly, ten hex bolts (5/8"-11 x 1 3/4", grade 5), and ten serrated-flange nuts (5/8"-11, grade 5). Do not reuse the mounting hardware from the previous pin box; use only the new hardware supplied 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 installation difficulty is rated as Moderate. The difficulty level is based on time and effort involved and may vary depending on the installer's level of expertise, the condition of the vehicle, and availability of proper tools and equipment.
Level the trailer front-to-back and measure from the ground to the bottom of the kingpin plate on the current pin box. Record this measurement as dimension A. This dimension will be used to install the new pin box at the proper height.
Properly support the pin box before removing mounting bolts. An unsupported pin box during removal can result in death, serious personal injury, or severe product and property damage. Once the pin box is properly supported, remove the fasteners securing the old pin box and carefully lower it to the ground.
Lift the new pin box and support it while positioning it at the appropriate height. Measure from the ground up to the flat plate of the upper jaw on the Helux pin box. Adjust the pin box height until it equals dimension A (recorded in Step 1) plus 9-1/2". Once positioned correctly, secure it with the supplied hardware kit using an equal number of fasteners as were previously used.
Torque the 5/8" bolts to 120 ft-lb±5 lb. This torque specification must be followed to ensure proper fastening and prevent damage to the product or vehicle.
Using the trailer landing gear, 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. Failure to follow this instruction 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.
Place chocks firmly against the front and rear of each trailer tire to prevent movement forward or backward. If necessary, lower the tow vehicle's tailgate to allow the pin box to clear. Monitor the clearance of the lowered tailgate to the trailer during hookups, as some truck and trailer combinations have little or no clearance.
Back the truck slowly toward the trailer until the truck's hitch contacts the bottom of the pin box and the kingpin slides into the receiver. During the hitching maneuver, the bottom of the trailer's pin box should come into contact with the hitch skid plate ramp. Once the kingpin is seated, latch the 5th wheel hitch in closed position per the instructions of the 5th wheel hitch manufacturer. Consult your hitch manufacturer's owner's manual for proper hitching procedure.
A pull test verifies that the trailer is properly hitched before traveling. After hitching, securely chock the trailer tires and ensure the landing gear is firmly on the ground and the tow vehicle is in park with the emergency brake engaged. Release the emergency brake, apply the trailer brakes, and slowly pull the trailer forward. If properly hitched, the wheel blocks and trailer brakes should keep the truck from moving forward. If the trailer separates from the hitch, 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 successfully performing the pull test, fully raise the landing gear per the manufacturer's recommendations. Check and inspect all electrical circuits for proper operation, including clearance lights, turn signals, and stop lights. 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. Periodically inspect the pin box coil spring for condition and any possible damage. If the kingpin is excessively worn, the jaw plate will need to be replaced. Check the condition of the shock absorber and replace if damaged or broken.
Never exceed the vehicle manufacturer's recommended towing capacity. Additionally, an unsupported pin box during product removal can result in death, serious personal injury, or severe product and property damage. Properly support the pin box throughout the entire installation process.
Yes. Safety glasses should be worn at all times while installing this product.
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. Always use the trailer landing gear per the manufacturer's recommendation to adjust trailer height.
Yes. The 5th wheel should always be towed while level. Adjustment of the pin box mounting height, the tow vehicle height, or suspension may be necessary to accomplish a level towing condition.
The Curt Helux Pin Box is available in seven models rated for pin weights from 1880 lb to 6000 lb loaded. You must weigh your fully loaded 5th wheel at a certified scale to determine the correct model. Returns are not accepted after installation, so verify your pin weight before purchasing.
The kit includes ten hex bolts (5/8"-11 x 1 3/4", grade 5) and ten serrated-flange nuts (5/8"-11, grade 5). Do not reuse the old mounting hardware; use only the new hardware supplied in the kit.
A minimum of two people are required to support the weight of the pin box during installation. The pin box weighs several hundred pounds. A forklift may be used as an alternative.
Torque the 5/8" bolts to 120 ft-lb±5 lb. Use proper torque tools to ensure correct fastening.
Measure from the ground to the bottom of the kingpin plate on the old pin box (dimension A). The new pin box's upper jaw flat plate should be positioned at dimension A plus 9-1/2" from the ground.
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. Improper positioning may cause the kingpin to rest on top of the closed jaws instead of inside them, risking trailer separation.
Yes. A pull test is required to verify proper hitching. Chock the trailer tires, apply the trailer brakes, and slowly pull forward. If properly hitched, the truck should not move forward. 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 accomplish a level towing condition. The 5th wheel should always be towed while level.
Inspect the pin box coil spring for condition and any possible damage. Be sure cargo is balanced from side to side and front to back. If the spring is damaged or broken, it should be replaced.
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 on the shock absorber or a disconnected shock; reconnect or replace if needed. Also verify that unwanted noise is not coming from the hitch itself; the hitch manufacturer can provide guidelines for this check.
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.
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