6 Hole Trailer Hub Cap - 5.5" Bolt Circle 340-4009 C40-4009 180.10629

• Diecast Aluminum Construction: Built from heavy-duty diecast aluminum to resist impact damage, road debris, and the extreme thermal cycling of heavy braking.
• Universal 5.5" Fitment: Features an industry-standard 6-hole mounting pattern with a 5.500-inch bolt circle, ensuring a perfect fit on most standard commercial trailer axles.
• Dual Lubrication Ready: Engineered with specialized seals and materials capable of securely holding either grease or oil bath lubrication without degrading.
• Tamper-Resistant Design: Built without a side fill plug for a cleaner exterior profile, reducing potential leak points and requiring filling through the center window.
• Direct Aftermarket Replacement: Delivers Fleet Standard reliability as a seamless, drop-in replacement for top industry numbers like Stemco 340-4009 and SKF C40-4009.

Seal your commercial trailer's wheel ends and prevent catastrophic bearing contamination with this premium 6 Hole Trailer Hub Cap by FleetPro Parts & Tires. Manufactured to strict Fleet Standard specifications, this heavy-duty diecast aluminum cap is designed for universal trailer axles running either oil or grease bath lubrication. A cracked, leaking, or improperly sealed hub cap will quickly lead to bearing failure, wheel lockup, and expensive on-road breakdowns. We stock these heavily right here in our Hanover Park, Illinois warehouse to ensure lightning-fast shipping for fleets, diesel repair shops, and owner-operators nationwide.

Leak-Free Wheel End Protection: The 6 Hole Trailer Hub Cap Advantage

This 6 Hole Trailer Hub Cap (Part # 180.10629) is engineered for long-lasting durability in severe-duty environments. Measuring 2.688 inches in height, it features a standard 6-bolt mounting pattern with a 5.500-inch bolt hole circle diameter. This specific model is designed without a side fill plug, offering a clean, tamper-resistant seal for mechanics who prefer to fill through the center window. The rugged diecast aluminum body resists warping and cracking, ensuring your wheel seal maintains perfect integrity.

As we continue to build the largest inventory of commercial truck parts in Illinois, we prioritize wheel-end hardware that offers reliable, "bolt-on" aftermarket performance. Serving as a professional-grade replacement for heavily searched part numbers like Stemco 340-4009, SKF C40-4009, and National 340-009, this hub cap is an essential part of any brake or bearing service. Manufactured by Automann, it delivers the rugged durability your fleet demands. Pro Tip: Need the version with a side fill plug? Use part # 180.10619. For a replacement window kit, use 180.10620.

Vehicle Fitment & Compatibility

This heavy-duty aftermarket hub cap is precision-engineered to fit the following commercial applications:

• Axle Type: Universal Trailer Axles
• Lubrication Compatibility: Works with both Grease and Oil
• Mounting Style: Standard 6-Hole (5.500" Bolt Circle)

Direct Replacement & Cross-Reference Numbers:

This aftermarket hub cap serves as a direct exact-fit replacement for the following part numbers:

• Stemco Interchange: 340-4009, 3404009, 300-4009, 3004009
• SKF Interchange: C40-4009, C40-4009BP, C404009, C404009BP
• National / Federal Mogul: 340-009, 340009
• Globetech Interchange: GT-4009, GT-4009K, GT4009, GT4009K
• Sloan / Wabash: H74009 / 38580404
• Automann Part #: 180.10629

Technical Specifications

• Component Type: Trailer Hub Cap (Without Side Fill Plug)
• Material: Diecast Aluminum
• Bolt Holes: 6
• Bolt Hole Circle Diameter: 5.500"
• Overall Height: 2.688"
• Related Gasket: Uses gasket 180.10619.1
• Product Level: Fleet Standard
• Brand: Automann (Distributed by FleetPro Parts & Tires)