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:

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.