Specs: 

• Outer diameter: 4.438"
• Matching bearing 3984 (sold separately)

If the bearings on your trailer are starting to look worn, then let The Trailer Parts Outlet help you find the right replacement options at the right price. This axle inner race is perfect for 12K to 16K axles, and its high-quality design is ideal for high-speed use. You can replace those old, worn bearings, and then drive down the road, towing your trailer with confidence. We can also help you find the compatible race, and we'll gladly answer any questions you have about any part in our store. Order your new trailer axle inner bearing from our online catalog today!

Features: 

• Works with 3984 bearing
• High-quality, tapered roller bearing is designed for high-speed use
• Replacement race and bearing numbers are universal  
• This is an inner race for 12-16k hub