6,000–7,000 lb Trailer Bearing Kit – D42 Spindle – 25580 14125A – 2.25″ Seal
6,000–7,000 lb Trailer Axle Bearing Kit Fits D42 Spindle (1.75″ x 1.25″) Rebuild your heavy-duty trailer hub with this complete bearing kit engineered for 6,000–7,000 lb trailer
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6,000–7,000 lb Trailer Axle Bearing Kit
Fits D42 Spindle (1.75″ x 1.25″)
Rebuild your heavy-duty trailer hub with this complete bearing kit engineered for 6,000–7,000 lb trailer axles using the D42 spindle configuration.
Designed for strength and reliability, this kit includes premium tapered roller bearings, matching races, grease seal, and hardware—everything required for servicing one hub.
Ideal for equipment trailers, car haulers, dump trailers, and commercial haulers.
📊 Specifications
| Component | Part Number | Dimensions |
|---|---|---|
| Inner Bearing | 25580 | 1.750″ ID |
| Inner Race | 25520 | 3.265″ OD |
| Outer Bearing | 14125A | 1.250″ ID |
| Outer Race | 14276 | 2.717″ OD |
| Grease Seal | 2.25″ ID x 3.376″ OD | |
| Spindle Type | D42 Spindle | |
| Axle Rating | 6,000–7,000 lb |
📦 Kit Includes
✔ (1) 25580 Inner Bearing
✔ (1) 25520 Inner Race
✔ (1) 14125A Outer Bearing
✔ (1) 14276 Outer Race
✔ (1) 2.25″ Double Lip Grease Seal
✔ (1) Tang Washer / Lock Washer
✔ (1) Spindle Nut
Complete kit for servicing one hub.
🔍 Key Features
✔ Heavy-Duty Capacity
Designed specifically for 6K–7K axle applications.
✔ Smooth Bearing Operation
Precision-machined tapered rollers reduce friction and heat.
✔ Durable Double Lip Seal
Prevents grease leakage and blocks contaminants.
✔ Complete Rebuild Solution
Includes hardware to eliminate sourcing separate parts.
✔ Professional-Grade Components
Suitable for commercial, fleet, and heavy-use trailers.
🚛 Compatible Applications
Commonly used on:
• 6,000 lb trailer axles
• 7,000 lb trailer axles
• Dexter 6K–7K axles
• Lippert 6K–7K axles
• Equipment trailers
• Car haulers
• Dump trailers
• Gooseneck trailers
Fits hubs using the D42 spindle configuration (1.75″ inner / 1.25″ outer).
⚠ Important Fitment Note
This kit fits:
✔ 6K–7K axles
✔ D42 spindles
✔ 2.25″ grease seal surface
Does NOT fit:
✘ 3,500 lb axles
✘ 5,200 lb axles (different outer bearing)
✘ Oil bath hub systems
Always confirm bearing numbers stamped on your existing bearings before ordering.
What sets us apart is our dedicated team of knowledgeable professionals who are always ready to assist. Great customer service isn't just a promise—it's the foundation of our success. We invite you to visit our showroom or reach out for personalized advice. Whether you're purchasing online or stopping by, we're here to make your trailer journey seamless. Visit Us Today
- Address: 4675 East Grand River Ave, Howell, MI 48843
- Phone: (517) 225-1991 (Call or text)
- Hours: Monday to Friday: 10:00 AM - 5:30 PM | Saturday: By appointment
Thank you for considering AAA Trailer. We're excited to help you hit the road with confidence! If you have any questions, don't hesitate to contact us.
To deliver your favorite products, we have partnered with the UPS & FEDEX . We are ready to entrust them with your orders and are always on your side if something goes wrong.
We will be happy to assist you with eligible returns, the return instructions, and the shipping address. If you need a return or exchange, send us an email so we can discuss a replacement.
6,000–7,000 lb Trailer Bearing Kit – D42 Spindle – 25580 14125A – 2.25″ Seal
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Regular price
$59.00
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Frequently Asked Questions
Get answers to common questions
Yes. We partner with UPS and FedEx for shipping. Delivery timelines can vary by item and destination.
Yes, delivery may be available depending on your location and the item. For the fastest confirmation (and pickup/delivery coordination), please call or text us and we’ll guide you through the options.
If you need a return or exchange, email us first so we can discuss the best solution. We’ll help confirm eligibility and provide return instructions and the correct shipping address.
Yes—AAA Trailer offers financing options for select trailer brands. Details and application links are available on the Financing page.
For most products, a license is not required. If an item does require one, it will be clearly stated on the product page.
Warranty coverage depends on the manufacturer/product and will be listed when applicable. For example, some trailer listings specify coverage such as 1-year overall + 1-year axle coverage.
Still have questions?
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Ready to get your trailer back on the road?
Our trailer experts are here to help you find the right parts
6,000–7,000 lb Trailer Bearing Kit – D42 Spindle – 25580 14125A – 2.25″ Seal
$59.00
Fast Shipping
In stock and ships in 1-2 business days
Pickup Available
Ready for pickup at our Grand Rapids location
Expert Support
Call us if you need help with fitment or installation
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30-day satisfaction guarantee on all parts
Ships in 1-2 business days
Pickup available in Grand Rapids
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