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  1. 5th Wheel Pin Box
  2. CURT
  3. Lippert 1116
  4. Upgraded Pin Box
  5. Absorbs Road Shock and Reduces Chucking
  6. 19000 lbs GTW
Curt Rota-Flex 5th Wheel Pin Box - Lippert 1116 - 19,000 lbs
CURT

Curt Rota-Flex 5th Wheel Pin Box - Lippert 1116 - 19,000 lbs

Part Number: LC176440
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$710.59
Retail:$1,087.89
You Save: $377.30
5th Wheel Pin Box
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This Rota-Flex pin box has a pivoting head with a built-in rubber compound that works to reduce chucking and absorb road shock, resulting in a smoother ride and less wear and tear on your trailer. Replaces Lippert 1116 pin boxes. 1-800-940-8924 to order CURT 5th wheel pin box part number LC176440 or order online at etrailer.com. Free expert support on all CURT products. Great prices and Fastest Shipping for Curt Rota-Flex 5th Wheel Pin Box - Lippert 1116 - 19,000 lbs. 5th Wheel Pin Box reviews from real customers.
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  • Reviews (80)
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CURT 5th Wheel Pin Box - LC176440

  • Lippert 1116
  • Upgraded Pin Box
  • Absorbs Road Shock and Reduces Chucking
  • CURT
  • 19000 lbs GTW
  • Fixed Turret

This Rota-Flex pin box has a pivoting head with a built-in rubber compound that works to reduce chucking and absorb road shock, resulting in a smoother ride and less wear and tear on your trailer. Replaces Lippert 1116 pin boxes.


Features:

  • Pivoting pin box replaces standard pin box on your 5th-wheel trailer to improve handling and limit strain on the truck and trailer
    • Minimizes chucking by allowing controlled movement of king pin within your hitch
  • Rubber compound built into the head absorbs road shock
    • Reduces wear and tear on trailer
  • Black powder coat provides rust resistance
  • Sturdy steel construction
  • King pin connects to any 5th-wheel trailer hitch
  • Bolt-on installation with no assembly required
  • Made in the USA


Specs:

  • Designed to replace Lippert 1116 5th-wheel pin box
  • Weight capacity: 19,000 lbs
  • 1-Year limited warranty


Notes:

  • Do not use the Curt Rota-Flex pin box with any type of gooseneck adapter.
  • The Curt Rota-Flex is not compatible with Curt Q-Series 5th wheel hitches.

The Rota-Flex pin box has a pivoting head and built-in rubber compound that help to reduce checking and absorb road shock for a smoother ride as you tow your fifth-wheel trailer.


Pivoting Head Reduces Chucking

The Curt Rota-Flex pin box has a pivoting head to help reduce chucking

The pivoting head on the Rota-Flex allows for controlled back and forth movement of the king pin to reduce the uncomfortable jarring known as chucking. Unlike a rigid pin box that has little give at the point where the trailer and the hitch are connected, the Rota-Flex can pivot slightly to compensate for those times that your trailer suddenly pushes or pulls on your tow vehicle. Because the pin box head - not the king pin itself - is moving, the chucking that often occurs when the king pin jerks around inside the hitch is significantly reduced.


Rubber Compound Absorbs Road Shock

The Curt Rota-Flex pin box has a built-in rubber compound to help absorb road shock

A heavy-duty rubber compound is built into the head assembly of the Rota-Flex pin box. This rubber absorbs the bumps and vibrations, or road shock, experienced when towing a fifth-wheel trailer over rough roads. Standard pin boxes without any type of shock absorption transfer road shock to your trailer, resulting in potential damage to the trailer and an overall bumpy ride. The shock-absorbing rubber inside the Rota-Flex takes the beating so there's less wear and tear on your trailer or RV and you get a smoother ride.


Easy, Bolt-On Installation

The Rota-Flex is easy to install. Simply remove your existing Lippert 1116 pin box and install the Rota-Flex on your trailer or RV. The Rota-Flex uses the same bolts that held on your original pin box so no additional hardware is required. Plus, it comes out of the box ready to be put on your trailer, so no assembly is needed. Because the Rota-Flex is quite heavy, you should put it on an elevated surface or have a friend help you support its weight during installation.



176440 Curt Rotaflex Fifth Wheel Kingpin Box for Lippert 1116

Replaces 176440 Lippert Components (LCI) Rotaflex by Trail Air Fifth Wheel Kingpin Box for Lippert 1116





Customer Satisfaction Score:


Customer Reviews

Curt Rota-Flex 5th Wheel Pin Box - Lippert 1116 - 19,000 lbs - LC176440

Average Customer Rating:  4.7 out of 5 stars   (80 Customer Reviews)

This Rota-Flex pin box has a pivoting head with a built-in rubber compound that works to reduce chucking and absorb road shock, resulting in a smoother ride and less wear and tear on your trailer. Replaces Lippert 1116 pin boxes.

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Excellent service. Fast delivery and great price.



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arrived ahead of time in great shape. Have not put on yet.



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Good Product will recommend to others



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Super helpful, fast shipping, arrived earlier than expected, A+++ for Amy and her knowledge of the pin box I needed.



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Product arrived fast, although it was a little beaten by UPS item worked just fine



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Shipment was on time as promised. The packing in the box was not well done and it had some scratches. Will be trying it out in a few weeks to see how it works.



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Works great



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Nice product. Would have been nice if ups didn’t loose the first one but you guys got me another one quickly



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Show More Reviews

See what our Experts say about this CURT 5th Wheel Pin Box

  • Can The Curt Rota-Flex Pin Box Be Used With The Curt E-Series Hitches?
    I spoke with Curt, and they actually say that you CAN use the Curt E-Series hitches, like the Curt E16 5th Wheel Trailer Hitch w/ R16 Roller - Slide Bar Jaw # 16516 with the Curt Rota-Flex 5th Wheel Pin Box # LC176440. They expressed that the only hitches they do not recommend to be used with the Rota-Flex are the Q-Series hitches. Attached are a couple of product review videos for you to check out as well.
    view full answer...
  • Best Cushioned Pin Box for 2019 Keystone Sprinter Limited with Lippert 1116 Pin Box
    For your 2019 Keystone Sprinter Limited Fifth Wheel trailer that has a Lippert 1116 pin box installed on it currently the best cushioned upgrade option we have is the Trailair part # LC155943 which uses an air bag and shock to cushion bouncing and jarring. This option will do the best to cushion the ride quality and also has more capacity than you'd need as it's rated for 21,000 lbs trailer weight.
    view full answer...
  • Why Can't the Curt Rota-Flex Pin Boxes Be Used with the Curt Q-Series 5th Wheel Hitches
    Hey Derek, thanks for reaching out! The Curt Rota-Flex pin boxes, like part # LC176440 you referenced, aren't compatible with the Curt Q-Series hitches because the pin box hitch plate moves and the Q-Series hitches use a spherical axial bearing which provides a smooth ride quality for standard pin boxes, but will work against the movement of the Rota-Flex pin boxes. Instead of the Q-Series I recommend using the A-Sers # C16140 which is pretty similar, but it has a torsion head so it will...
    view full answer...
  • Trailair Rota Flex Cushioned Pin Box that Fits as Replacement for Fabex 665
    The cushioned Trailair Rota-Flex 5th Wheel Pin Box # LC328330 does fit the Fabex 665 that you have now and would work great as a cushioned replacement. While this pin box states it's designed to fit as a replacement for the Lippert 1621 or 1621HD we've found that in general the 1621 and the Fabex 665 are identical.
    view full answer...
  • Does the Reese M5 5th Wheel Hitch Work W/ a Curt Rota Flex
    Hi Ted, yes the Reese M5 # RP37FR will work with your 2022 Ram 3500 with the factory prep package as well as the Curt Rota Flex pin box # LC176440. I also would say the 32K to be overkill, because you could get away with using the 27k # RP37FR. With this hitch you'd still have 3,000 lbs of capacity to play around with in case your RV is a bit heavier fully loaded.
    view full answer...
  • Is Rotaflex or MORryde Pin Box Better for Keystone Montana
    The ride quality between the MORryde and the Rotaflex pin boxes are about equal. I did some digging and the Keystone owners seem to mostly like both of them about the same. Some people preferred one over the other but in general I would say you aren't going to see a huge difference. One thing that was mentioned with the Rotaflex was that it squeaks a bit though.
    view full answer...
  • Correct Gen-Y Pin Box To Replace 19K Rota-Flex Pin Box On a 2018 Keystone Montana 5TH Wheel Camper
    The Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box # GY48FR would be the pin box you want to use on your 2018 Keystone Montana 5th Wheel. This Pin box has the 25,000lb towing capacity with a tongue weight rating of 2,500lbs to 4,500lbs. The 19K Trailair Rota-Flex 5th Wheel Pin Box # LC176440 is only offered in a 1116 bolt pattern that matches the Gen-Y hitch I have recommended above.
    view full answer...
  • Determining The Pin Box Bolt Pattern Of A 2019 Keystone Montana 3791 RD With The Pin Box Tag
    Thank you for the pictures, you have a Curt Rota-Flex 5th Wheel Pin Box - 19,000lbs # LC176440 with a 1116 bolt pattern so the Trailair Air Ride 5th Wheel Pin Box - Lippert 1116 - 21,000lbs # LC155943 you were wanting to install will be a compatible fit.
    view full answer...
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  • What Replacement Pin Box do You Recommend to Use with a Curt Q16 and a Lippert 1116?
    I went ahead and reached out to my tech at Lippert (who designed the Rota-Flex # LC176440 for Curt), and they confirmed that the reason why Curt E series and Curt Q series hitches like the Curt Q16 is not compatible with the Rota-Flex is because the articulating movement of the hitch interferes with the pivoting movement of the pin box. These two mechanisms work against each other. With that being said, if you have the Lippert 1116 pinbox, a great alternative that does not have a pivoting...
    view full answer...
    Image 1 for
  • Matching Pin Box for Replacing With Trailair Rota-Flex 5th Wheel Pin Box
    The Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1116, # LC176440, is designed to be a direct replacement for the Lippert 1116 pin boxes, if you have a 1116 pin box then this will fit. Please see attached image for bolt pattern and note the attached video for visual in points of measurements. I am uncertain what specific measurement you are wanting but this video covers multiple points across the three rows on this pin box plus width and length.
    view full answer...
    Image 1 for
  • Compatibility of B&W Companion with a Rotaflex Pin Box
    Yes, the B&W Companion OEM 5th Wheel Hitch for Chevy/GMC Towing Prep Package - Dual Jaw - 25,000 lbs item # BWRVK3705 that fits your 2019 Chevy Silverado 3500 OEM prep package will work with the Curt Rota-Flex 5th Wheel Pin Box item # LC176440. It looks like your 2021 Alliance Paradigm 310RL has a gross weight capacity of 15,000 lbs. The B&W Companion OEM 5th Wheel Hitch for Chevy/GMC Towing Prep Package - Dual Jaw - 20,000 lbs item # BWRVK3700 is also compatible and will fit your Silverado's...
    view full answer...
    Image 1 for
  • Which Trailair Rota-Flex Pin Box Compatible with Lippert 1621 Pin Box
    I have a solution for you, but the Trailair Rota-Flex # LC176440 pin box is designed to replace 5th wheel trailers with a Lippert 1116 pin box and not the 1621 pin box. Instead, you'll want to use either the # LC328330 (trailer with GVWR of less than 18000-lbs) or the # LC328329 (trailer of GVWR less than 21000-lbs). The Trailair Rotaflex is a great solution to help reduce the bouncing and jarring that car be experienced with an uncushioned pin box and will be a great upgrade for your towing...
    view full answer...
  • Recommended 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter To Improve Ride
    We do offer Air Ride Goose Box pin boxes that will work with a gooseneck hitch in your truck. The included air bag and dual shocks help provide cushion and reduce road shock, while improving the overall ride. If you have a Lippert 1621, 0719, or 1621HD, or Fabex PB-600 series pin box on your trailer you can use part # RP85FR with a 20,000-lb capacity. If you have a Lippert 1716, 0115, or 1116 pin box then the Air Ride Pin Box you can use is part # RP94716-61301. This has a 16,000...
    view full answer...
  • Recommended Upgraded Pin Box For A 2017 Keystone RV Raptor 5th Wheel Toy Hauler 425TS
    The Rota Flex pin box comes in either a 1621 # LC328330 or 1116 # LC176440 bolt pattern. For an upgrade I recommend the Trailair Flex Air 5th Wheel Pin Box # LC369535 for a 1621 bolt pattern or the Trailair Air Ride 5th Wheel Pin Box # LC155943 for a 1116 bolt pattern. These pin boxes are both rated for 21,000lbs to ensure you safely tow your 2017 Keystone RV Raptor 5th Wheel Toy Hauler 425TS with a 15860lbs dry weight. The Flex Air drastically reduces chucking, absorbs road shock, and...
    view full answer...
  • Comparing The Trailair Rota-Flex 1116 And Trailair Air Ride 1116 Pin Boxes
    The Trailair Air Ride 5th Wheel Pin Box - Lippert 1116 - 21,000lbs Item # LC155943 has two different placements when installing but as you can see in the attached dimension spreadsheets it has an overall height of 17-7/16" whereas the Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1116 - 19,000lbs Item # LC176440 only has an overall height of 11.05". The # LC155943 is going to sit higher but you also need to make sure you aren't raising too much and placing your camper out of level as this...
    view full answer...
    Image 1 for Image 2 for
  • Replacing Lippert Rota-Flex with Reese Goose Box on 2018 Grand Design Solitude
    To replace your existing Rota-Flex 5th wheel pin box with the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP85FR, you'll need to confirm its model number and weight rating. This information is typically displayed on a sticker or plate on the pin box itself. Lippert makes three models of the Rota-Flex, so the weight rating on the label is enough to identify which of these three you have: -Model 1621/1621HD Trailair Rota-Flex 5th Wheel Pin Box 18,000 lbs # LC328330 -Model...
    view full answer...
  • Is Trailair Rota-Flex Compatible With B&W Companion 5th Wheel Hitch
    Yes, you can use a Trailair Rota-Flex 5th Wheel Pin Box like # LC176440 (which replaces Lippert 1116) or # LC328329 (which replaces Lippert 1621) with the B&W Companion 5th Wheel Trailer Hitch # BWRVK3500. I have linked video reviews below for you to check out of both the Rota-Flex and the Companion.
    view full answer...
  • Recommended Pin Box to Replace Lippert 1116 for Added Cab Clearance
    The Trailair Rota-Flex 5th Wheel Pin Box # LC176440 that you referenced will work well to provide a more comfortable ride but it won't help with the cab clearance issue you're having with your short bed truck. The dimensions on the pin box will be fairly similar to your existing Lippert 1116 pin box, which is what this is designed to replace. If you have a Lippert 1116 model pin box the best solution for adding both the needed turning clearance and a more comfortable ride is with the...
    view full answer...
  • Is Trailair Rota-Flex Pin Box Available in 12-3/8 Inches Wide?
    The Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1621 or 1621HD -18,000 lbs # LC328330 and the 21,000 lbs # LC328329 are 12-1/2 inches wide. The sizes of pin boxes for width are simply 12 inches or 12-1/2 inches so you would definitely want the 12-1/2 inch pin box. You will want to check your current pin box number which should be on a sticker on the actual box itself. If not there, you will want to measure your mounting bolts to ensure the correct fit. I've attached an article...
    view full answer...
  • Can You Use The Curt Rota-Flex Pin Box With a Curt A20 5th Wheel Hitch
    Yes, the Curt Rota-Flex 5th Wheel Pin Box for Lippert 1116, # LC176440 is compatible with the Curt A20 5th Wheel Trailer Hitch w/ R20 Slider, # C16541 that you linked to.
    view full answer...
  • Is RotaFlex Pin Box Similar to Mor Ryde Pin Box In terms of Cushioning
    The Mor/Ryde pin boxes and the Trailair RotaFlex like part # LC176440 are pretty similar in how they cushion the ride. The Mor/Ryde is definitely more common out there on the road, but the feedback I've read on people who have tried both said they were very similar.
    view full answer...
  • Replacement Sidewinder Pin Box for Lippert/Trailair Rota-Flex 1116 Pin Box
    I reached out to my contact at Lippert who said that the current Rota-Flex you have on your 5th wheel trailer is the part # LC176440 which is rated for 19K and pin box number 1116. The correct Sidewinder replacement is part # RP61412 on our site which is rated for 16K. This comes with a universal wedge to lock out the king pin but if you can tell me what 5th wheel hitch you have I can let you know if there are any custom wedges that would offer a better fit. Please also note the attached...
    view full answer...
    Image 1 for
  • Upgrading to Cushioned 5TH Wheel Pin Box on 1716 OEM Pin Box
    The Trailair Rota-Flex # LC176440 will not fit your 1716 that is on your 5th Wheel Camper. It is a replacement for the 1116 bolt pattern and was confirmed by Lippert to not fit your 1716. You would need to go with the MORryde Cushioned Pin Box for your 1716 pin box replacement. There are 3 different boxes available dependent on your 5th wheels GVWR. GVWR up to 11,500lbs # MR57VR GVWR 11,500-14,000lbs # MR37VR GVWR 14,000-18,000lbs # MR97VR
    view full answer...
  • What Is The Torque Specs For The Curt Rota-Flex Pin Box?
    For the Curt Rota-Flex 5th Wheel Pin Box # LC176440, Curt recommends to reuse the old hardware that was removed from the original pin box, unless they are damaged or unusable. The torque spec is dictated by the type of bolt that is used along with the type of metal it is made of. For example, if you have 1/2"-13 grade 5 zinc plated bolts, then the proper torque spec is, 65 ft-lbs. I have attached a chart that expands upon this, provided by Curt.
    view full answer...
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Info for this part was:

Employee Lindsey S
Edited by:
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Employee Randy B
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Expert Research:
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Video Edited:
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