8K or 8,000 Lbs Axle Parts
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The 8,000 lb axle is commonly found on heavy-duty equipment trailers, goosenecks, dump trailers, flatbeds, and commercial hauling applications. Because 8K axles handle heavier loads, they often use larger bearings, brakes, and hub assemblies than lighter-duty axles. However, not all Dexter 8K axles use the same brake and hub setup. Some use 12" x 2" brakes, while others use 12¼" x 3⅜" brakes or 12" x 2.5" hub/drum setups.
Here are the most common parts found on Dexter 8K trailer axles.
1. Bearings
Most Dexter 8K axles commonly use:
Inner Bearing: 25580
Outer Bearing: 02475
These heavy-duty bearings are designed to support larger loads and demanding towing conditions.
Routine greasing and inspection help prevent premature wear and overheating.
2. Grease Seal
A common grease seal for many Dexter 8K axles is:
8-288 Grease Seal
- 2.250" inner diameter
- 3.376" outer diameter
Always verify seal size before ordering, especially on oil bath applications.
3. Hub & Drum Assemblies
Most Dexter 8K axles use:
- 8 on 6.5 bolt pattern
- Heavy-duty hub & drum combinations
- Grease or oil bath configurations
However, brake and drum sizes vary by axle configuration.
8K Axles with 12" x 2" Brakes
Some Dexter 8K axles use:
12" x 2" electric brake assemblies
These setups are commonly similar to heavier 7K axle configurations and often include:
- 8-lug hub/drums
- 5-bolt brake flange
- Grease-packed bearings
8K Axles with 12" x 2.5" Brakes
Other Dexter 8K axles use:
12" x 2.5" electric brake assemblies
These heavier-duty brake systems provide:
- Increased braking surface
- Improved stopping performance
- Larger hub/drum assemblies
These are commonly found on heavier equipment trailers and commercial applications.
8K Axles with 12¼" x 3⅜" Brakes
Some heavy-duty Dexter 8K axles use:
12¼" x 3⅜" electric brakes
These setups are more common on:
- Heavy commercial trailers
- Oil bath hub systems
- Severe-duty hauling applications
4. Brake Drums & Hub Sizes
Depending on axle setup, common drum options include:
- 12" x 2" hub/drums
- 12" x 2.5" hub/drums
- 12¼" x 3⅜" heavy-duty drums
This is why measuring brakes or checking axle tags is important before ordering.
5. Oil Caps or Dust Caps
Dexter 8K axles may include:
- Standard grease caps
- EZ Lube caps
- Oil bath caps with sight windows
Oil bath hubs are common on many heavier 8K applications.
6. Suspension Components
Many tandem 8K trailer setups use:
- Heavy-duty leaf springs
- Equalizers
- Wet bolt kits
- Bronze bushings
- Heavy-duty shackles
Worn suspension parts can contribute to poor towing and uneven tire wear.
7. Spindle Type
Many Dexter 8K axles use a heavy-duty spindle configuration that determines:
- Bearing fitment
- Seal size
- Hub compatibility
- Brake assembly fitment
Checking bearing numbers is one of the most accurate ways to confirm fitment.
Common Replacement Wear Items
The most commonly replaced 8K axle parts include:
✔ Bearings & races
✔ Grease or oil seals
✔ Brake assemblies
✔ Hub/drum assemblies
✔ Brake magnets
✔ Oil caps & gaskets
✔ Suspension hardware
Always Verify Before Ordering
Because Dexter 8K axles can use multiple brake and hub configurations, always confirm:
- Brake size (12" x 2", 12" x 2.5", or 12¼" x 3⅜")
- Bearing numbers
- Seal size
- Hub type (oil bath or grease)
- Bolt pattern
- Axle tag information
Small differences matter and can affect fitment.
At Highway Trailer Company, we carry a wide selection of Dexter 8K axle parts including bearings, seals, hub/drums, brakes, oil bath components, and suspension parts to help keep your trailer road-ready.