The Lippert 122075 is a direct-fit OEM replacement cotter pin engineered for Lippert trailer axle assemblies rated up to 8,000 lbs. At 1.75 inches in overall length, this pin secures the spindle nut on your axle hub, preventing loosening under load and vibration. If you are servicing wheel bearings, replacing a bent or corroded pin, or completing a brake or hub overhaul, this is the correct hardware for the job.
Cotter pins are a critical axle retention component. An undersized, oversized, or wrong-length pin can fail to lock the spindle nut properly, allowing hub loosening at highway speed. Lippert specifies this 1.75-inch pin for their 8,000 lb axle assemblies, and substituting a generic hardware-store pin of a different diameter or length risks improper fitment in the castle nut slot.
This pin is sold individually and is designed to be replaced any time the spindle nut is removed during bearing repacks, hub swaps, or brake service. Never reuse a bent or deformed cotter pin.
Engineered specifically for Lippert 8,000 lb axle spindle nuts -- no trimming or bending required for correct installation.
Matches Grand Design 120073, Gulf Stream 491BY9, and Keystone RV 438114 for broad trailer compatibility.
Weighs just 0.05 lbs -- keep a few spares in your parts kit so you are never stuck mid-service without one.
Covered by a limited 1-year manufacturer warranty from Lippert for defects in materials or workmanship.
The cotter pin on a trailer axle passes through the slotted (castle) spindle nut and the hole drilled through the spindle end. Once bent, it physically prevents the nut from rotating backward and loosening. Without a properly installed cotter pin, the spindle nut can back off under normal driving vibration, leading to bearing play, hub wobble, and potential wheel separation.
This pin is accessed during any of the following service tasks:
This Lippert cotter pin is sold under multiple part numbers depending on the RV brand your trailer was built under. All of the following are the same pin: