The 3,500 lb axle is one of the most common trailer axles found on utility trailers, cargo trailers, equipment trailers, boat trailers, and small dump trailers. If you own a trailer with a Dexter 3.5K axle, knowing the common replacement parts can make maintenance and repairs much easier.
Here are the parts most commonly found on a typical Dexter Axle 3,500 lb axle setup.
1. Bearings
Most Dexter 3.5K axles commonly use:
Inner Bearing: L68149
Outer Bearing: L44649
These are some of the most widely used trailer bearings in the industry.
Bearings should be inspected and greased regularly to prevent overheating and failure.
2. Grease Seal
A very common grease seal size on a Dexter 3.5K axle is:
10-19 Seal
- 1.719" inner diameter
- 2.565" outer diameter
Always confirm measurements before ordering since some variations exist.
3. Hub or Hub/Drum
Dexter 3,500 lb axles commonly use:
- 5 on 4.5 bolt pattern hubs
- Idler hubs (no brakes)
- Hub & drum assemblies (electric brakes)
These are often found on:
- Utility trailers
- Enclosed cargo trailers
- Landscape trailers
4. Electric Brakes
If equipped with brakes, most 3.5K Dexter axles use:
10" x 2¼" electric brake assemblies
Common features:
- Left-hand & right-hand assemblies
- 4-bolt mounting flange
- Self-adjusting or manual-adjust options
These are among the most commonly replaced trailer brake components.
5. Brake Drums
Brake drums for 3.5K axles are usually:
- 10" diameter
- 5-lug configuration
Often sold as complete hub/drum assemblies with races installed.
6. Dust Caps
Common dust cap sizes include:
- Standard drive-in caps
- EZ Lube grease caps (for Dexter EZ Lube axles)
If your axle has a grease zerk fitting on the spindle, it likely uses an EZ Lube style cap.
7. Suspension Components
Common suspension parts include:
- Double-eye leaf springs
- Equalizers (on tandem axle trailers)
- Shackles & suspension bolts
- Nylon or bronze bushings
Worn suspension parts can cause uneven tire wear and poor towing performance.
8. Spindle Type
Most Dexter 3.5K axles use a #84 spindle, which determines:
- Bearing fitment
- Seal size
- Hub compatibility
This is one reason bearing numbers are so important when ordering parts.
Common Maintenance Items
The most frequently replaced 3.5K axle parts include:
✔ Bearings
✔ Grease seals
✔ Hub/drum assemblies
✔ Brake assemblies
✔ Dust caps
✔ Suspension hardware
Routine maintenance can help avoid costly roadside breakdowns.
Always Verify Before Ordering
Not every 3,500 lb axle is identical.
Always confirm:
- Bearing numbers
- Seal size
- Bolt pattern
- Brake dimensions
- Axle manufacturer
Small variations can make a big difference in fitment.
At Highway Trailer Company, we stock a large selection of Dexter 3.5K axle parts including bearings, hubs, brakes, seals, suspension components, and hardware to help keep your trailer road-ready.