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DEXTER

Aluminum Oil/Grease Cap – Fortress Bolt-On – For 9K–12K Hubs | DXT
SKU: 912AL-GO-CPDXR
$48.00 USD $48.00 USD
Shipping calculated at checkout.
In stock
Description

This Fortress-series aluminum bolt-on cap kit is designed to upgrade Dexter 9,000–12,000 lb axles with a more durable and serviceable oil bath hub system. Built from high-strength aluminum, this cap offers superior protection and ease of maintenance. The complete bolt-on design replaces traditional press-fit caps, providing secure sealing and long-term reliability.

Detailed Information:
Axle Rating 9,000–12,000 lbs
Mount Style Bolt-On
Material Aluminum Alloy
Application Oil Bath Hub Systems
Fitting:

Engineered to convert Dexter 9K–12K axles to a Fortress bolt-on style hub cap. Direct replacement for OEM part #021-259-00. Compatible with oil bath hub assemblies and ideal for fleet upgrades or heavy-duty service environments.

Features:
  • Fortress Bolt-On Design: Replaces press-fit caps with a bolt-on system for easier access and improved reliability.
  • Durable Aluminum Cap: Built to handle demanding use with superior corrosion resistance.
  • Complete Kit: Includes cap, gasket, fill plug, rubber logo plug, and hardware for installation.
  • Service-Friendly: Makes oil inspection, draining, and refilling simpler with bolt-on accessibility.
  • OEM Dexter Fit: Manufactured to meet Dexter's exacting specs for seamless compatibility.
Interchangeable Part Numbers:
  • K21-259-00
Product Overview:

The Aluminum Fortress Bolt-On Oil Cap Kit is a high-performance upgrade for Dexter 9K–12K axles. With its bolt-on design and rugged build, it offers improved maintenance access and long-lasting protection for oil bath hub systems. Ideal for fleets, heavy trailers, or service conversions seeking durability and ease of upkeep.

We want you to be completely satisfied with your purchase. That’s why we offer a hassle-free return policy within 30 days of delivery*. If your item is unused, in original packaging, and eligible for return, you can send it back for a refund or exchange.

*Some exclusions may apply

Some of our products are backed by a 1-year limited manufacturer warranty covering defects in materials and workmanship under normal use. If you experience any issues during this period, we’ll work with you to repair, replace, or resolve it according to warranty terms.*

*Proof of purchase required

Need it fast? We’ve got you covered. Orders confirmed before 3 PM Eastern Standard Time (Monday–Friday) are processed and shipped out the same business day. Orders placed after the cutoff will ship the next business day.
Aluminum Oil/Grease Cap – Fortress Bolt-On – For 9K–12K Hubs | DXT

Customer Reviews

Based on 12 reviews
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A
Ambrosio Mallatratt
Perfect fit on my 10K axle.

I've had issues with other brands not fitting correctly, but this one bolted right up to my Dexter 10K axle. The included gasket and hardware made the install a breeze.

A
Artur Vasiliev
Finally, an easy way to check the hub oil!

I was tired of dealing with the old press-fit caps. This bolt-on design makes checking and topping off the hub oil so simple. It's a small change, but a huge quality-of-life improvement.

E
Eduardo Castillo
Worth the price for the convenience.

I was a bit hesitant about the cost, but the time it saves me on maintenance is well worth it. This kit is a game-changer for anyone who hauls heavy loads regularly.

P
Piotr Nowak
Perfect upgrade for my fleet.

I'm upgrading all our trailers to these Fortress caps. The easier maintenance saves my mechanics a ton of time, and they're holding up great. A must-have for anyone with 9K-12K Dexter axles.

I
Ivan Petrović
Great product, fast shipping.

Ordered this to upgrade my trailer. It arrived quickly and was exactly as described. The quality is excellent, and it was a simple, trouble-free installation.

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