How to Determine Fifth Wheel Pin Box Model
Updated 11/13/2018 | Published 11/12/2018
Products Featured in This Question
Question:
I have a 2014 Heartland Gateway 3650BH 5th wheel with a factory standard pin box, I need to replace with a FlexAir pin box. I do not have the factory pin box part number. Which FlexAir pin box should I buy for replacement?
asked by: Tendayi M
Expert Reply:
If you are unable to contact your trailer's manufacturer with your VIN to find the factory pin box model number there are some steps you can take which will allow you to determine what pin box model you have so you can purchase a new FlexAir.
To do this you will need to follow the steps in the linked help article, which I will go over with you. Start by selecting your pin box style like in the accompanying photo (which you will also find in the help article). You will then need to use that drawing and measure the horizontal bolt hole distance, vertical bolt hole distance, bolt size, bolt head size, front row of bolts to king pin, back row of bolts to king pin and pin box width.
When you have these measurements you will need to compare those to the chart in the aforementioned linked help article and find the pin box with the matching dimensions.
For example, if you had 7-7/8" horizontal bolt hole distance, 2" vertical bolt hole distance, 5/8" bolt size, 15/16" bolt head size, measured 17-3/4" from the front row of bolts to the king pin, 25-5/8" from the back row of bolts to the king pin and a 12" pin box width you have a Lippert 1621 pin box and need the Curt Flex Air # LC328492.
The following are the other options depending on your pin box:
- Lippert 0719: # LC328484
- Lippert 1621HD: # LC158778
- Lippert 1116: # LC155943
- Leland 7920: # UF35-946208
- Fabex 750, 765 and 770, RBW 7028: # UF35-946212
- Fabex 730, RBW 7019: # UF35-946215
- Steelco/Davis, Venture: # UF35-946211
Product Page this Question was Asked From
Curt Flex Air 5th Wheel Pin Box - Lippert 1621 - 18,000 lbs
- 5th Wheel Pin Box
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 18000 lbs
- Air Ride Suspension
- Fixed Turret
- Lippert 1621
- CURT
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: Curt Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000 lbs
- Shop: Curt Flex Air 5th Wheel Pin Box - Lippert 1621 - 21,000 lbs
- Video: All About the Curt Air Ride 5th Wheel Pin Box
- Video: How to Set Up Your Curt Air Ride 5th Wheel Pin Box on a 2021 Highland Ridge Open Range Fifth Wheel
- Shop: Trailair Air Ride 5th Wheel Pin Box - Lippert 1116 - 21,000 lbs
- Q&A: Will Trailair Air Ride 5th Wheel Pin Box Fit Grand Design Momentum 397TH
- Video: Roadmaster Comfort Ride Shock Absorbers Installation - 2019 Keystone Montana Fifth Wheel
- Video: Roadmaster Comfort Ride Shock Absorbers Installation - 2014 Jayco Pinnacle Fifth Wheel
- Shop: Roadmaster Comfort Ride Shock Absorbers for Tandem Axle Trailers - 5,200-lb to 7,000-lb Axle
- Article: 4 Steps to Choosing Your 5th Wheel Pin Box
- Shop: Global Link RV Baggage Door Slam Latch - Black - 1-3/4" Thick
- Q&A: How To Make The Global Link RV Baggage Door Slam Latch # 295-000078 Fit A 1" Thick Compartment Door
- Q&A: Drawing for Global Link RV Baggage Door Slam Latch, # 295-000078
- Q&A: Can the Lock Cylinders On the Global Link Locking Baggage Locks Be Changed
- Video: Lippert Bolt-On Shock Kit w/ Heavy Duty Gas Shocks Feature Review
- Video: In-Depth Review of the Trailair Air Ride 5th Wheel Pin Box
- Q&A: Determining The Pin Box Bolt Pattern Of A 2019 Keystone Montana 3791 RD With The Pin Box Tag
- Q&A: Replacement Pin Box For A 2010 Carriage Carri-Lite 5th Wheel Trailer
- Q&A: Can Trailair Flex Air # LC328492 Replace Lippert 1621HD Pin Box on a 2017 Jayco Seismic Wave 355W
- Search Results: lippert rhino 5th wheel pin box
- Search Results: lippert 5th wheel pin box
- Search Results: rhino box
- Search Results: rhino pin box
- Video: Breaking Down the Curt Air Ride 5th Wheel Pin Box
- Shop: Fifth Wheel Hitch
- Shop: Lippert Bolt-On Shock Kit w/ Heavy Duty Gas Shocks - 5,200-lb to 7,000-lb (3") Overslung Axle
- Shop: Roadmaster Comfort Ride Shock Absorbers for Triple Axle Trailers - 5,200 to 7,000-lb Axle
- Shop: RV Covers
- Article: Trailer Wiring Diagrams
- Article: Breakaway Kit Installation for Single and Dual Brake Axle Trailers