12K or 12,000 Lbs Axle Parts
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The Dexter 12,000 lb trailer axle is commonly found on heavy-duty goosenecks, flatbeds, equipment trailers, dump trailers, and commercial hauling applications. These axles are designed for demanding loads and are commonly available with either electric drum brakes or hydraulic brake systems.
Below are some of the most common replacement parts used on many Dexter 12K trailer axles.
Dexter Axle
1. Hub, Wheel End & Bearing Parts
Many Dexter 12K axles commonly use the following wheel-end components:
Bearings & Races
Inner Bearing (Cone):
#387A (Dexter Part: 031-019-02)
Inner Race (Cup):
#382A (Dexter Part: 031-019-01)
Outer Bearing (Cone):
#25580 (Dexter Part: 031-022-02)
Outer Race (Cup):
#25520 (Dexter Part: 031-022-01)
These heavy-duty tapered roller bearings are designed for high-capacity towing and commercial trailer use.
Oil Seal
Unitized Oil Seal:
010-056-00
Dimensions: 3.125" ID x 4.506" OD
Many Dexter 12K axles use oil bath hubs, making seal condition critical for preventing contamination and bearing failure.
Oil Hub Cap Kit
Screw-On Oil Hub Cap Kit:
K71-148-00
Typically includes:
- 21-36 clear plastic 4" cap
- O-ring
- Rubber fill plug
Oil bath caps allow for quick visual inspection of lubricant condition and level.
Complete Bearing Kit
Complete Bearing Kit:
K71-722-00
This kit commonly services one full wheel end and includes the bearings and related service components needed for maintenance.
2. Electric Brake Assemblies (12¼" x 5")
Many Dexter 12K electric brake axles use:
12¼" x 5" Forward Self-Adjusting (Nev-R-Adjust) Brake Assemblies
These are heavy-duty brake assemblies mounted to a 7-bolt backing plate.
Left-Hand (Driver Side)
023-442-00
Right-Hand (Passenger Side)
023-443-00
Replacement Brake Shoe & Lining Kit
K71-502-00
Fits:
12¼" x 5" cast backing plate brake assemblies
Electric brakes remain a popular choice due to ease of maintenance and compatibility with trailer brake controllers.
3. Hydraulic Brake Parts (12¼" x 5")
Some Dexter 12K axles use hydraulic drum brakes or hydraulic disc systems.
Hydraulic Drum Brake Assemblies
Left-Hand Hydraulic Drum Brake:
023-444-00 (Duo-Servo Style)
Right-Hand Hydraulic Drum Brake:
023-445-00 (Duo-Servo Style)
Hydraulic Disc Brake Pad Set
K71-623-00
Common friction replacement pad kit for:
10K–12K Dexter hydraulic disc brake calipers
Hydraulic systems often provide:
- Stronger braking performance
- Better heat management
- Improved stopping under heavy loads
4. Suspension Parts (3" Wide Springs)
Many Dexter 12K setups use 3" wide heavy-duty suspension components.
Heavy Duty U-Bolt
007-124-00
Designed for:
5" diameter heavy-wall axle tube
U-Bolt Tie Plate
012-053-00
Used to secure axle and spring assemblies.
Suspension Hardware Kit
K71-137-00
Typically includes:
- Heavy-duty shackle straps
- Suspension bolts
- Locknuts
Worn suspension components can contribute to poor towing performance and uneven tire wear.
Important Fitment Note
If your axle was manufactured before 1999 or uses a non-standard hub layout (such as a 10-lug heavy truck wheel setup), some of these part numbers may differ.
You can typically find your exact 9-digit Dexter serial number etched directly into the rear face of the axle tube, which helps confirm exact compatibility.
Common Replacement Wear Items
The most commonly replaced Dexter 12K axle parts include:
✔ Bearings & races
✔ Unitized oil seals
✔ Oil hub caps & O-rings
✔ Electric or hydraulic brake assemblies
✔ Brake shoes or pads
✔ Suspension hardware
✔ U-bolts & tie plates
Routine maintenance helps prevent costly downtime and keeps your trailer hauling safely.
At Highway Trailer Company, we carry a wide selection of Dexter 12K axle parts including bearings, seals, brakes, oil bath components, suspension hardware, and replacement parts to help keep your trailer road-ready.