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Trailer Parts Pro 5,200-6,000 lb Zerk Lube Axles with 6 Bolt Hubs Dust/Grease Caps with Rubber Plugs, 2.440" OD, 2-Pack RG04-080


Regular price $10.99 USD
Shipping calculated at checkout.

Care information

To ensure optimal performance and extend the service life of your new trailer components, please follow these care guidelines after purchase:

  • Before installation, check all parts for shipping damage or missing components. Do not install damaged parts.
  • Always use correct tools and torque settings. Improper installation can lead to premature wear or failure.
  • For bearings, suspensions, and brake components, apply high-quality trailer grease before first use if not pre-greased.
  • Some parts (like brake assemblies) require a short break-in period to achieve full performance. Follow manufacturer instructions for best results.
  • Recheck fasteners, grease levels, and moving components after 100 miles of towing, then at regular intervals.
  • After exposure to water, road salt, or mud, clean and dry parts thoroughly. Apply anti-rust treatment if needed.
  • If storing unused parts, keep them in a dry, sealed container away from moisture and direct sunlight.

Delivery and Shipping

Handling Time: Orders ship out within 1 business day after payment is received.

Shipping Methods: We use trusted carriers like UPS, FedEx, or USPS based on package size and destination.

Delivery Time: Estimated delivery within 2–6 business days (U.S. domestic orders).

Tracking: A tracking number will be provided once your order is dispatched.

This brake assembly fits most standard 7,000 lb trailer axles that use 12" × 2" electric brakes with a 5-bolt mounting flange. Please verify your axle rating and brake dimensions before ordering. If you're unsure, send us your axle tag or hub information and we'll help confirm compatibility.
Yes. It is compatible with many standard Dexter, Lippert, Rockwell American, AL-KO, and other 7,000 lb trailer axles that use a standard 12" × 2" brake assembly. Always verify your axle specifications before purchasing.
Yes. This is a self-adjusting electric brake assembly, which automatically maintains proper brake shoe clearance during normal operation. This reduces maintenance and helps provide consistent braking performance.

Product Overview:

This premium replacement grease cap kit provides reliable protection for 5.2K and 6K trailer axles featuring 6-bolt hubs. Stamped from heavy-duty cold-rolled steel, the standard profile cap includes a dedicated cut-out designed specifically for Zerk lube hub systems. The included rubber push-pop in seals ensure a secure fit to block road debris, dust, and moisture from contaminating the wheel bearings.

What's Included by Kit Option: 

2 x Dust / Grease Caps

2 x Rubber Plugs

Specifications:

Brand: Trailer Parts Pro

Manufacture Part Number: RG04-080

Alternate Item Numbers: 7700016-10, PP21-1-AL

Outer Diameter (OD): 2.440"

Fitment: 5.2K and 6K axles with 6 bolt hubs

Material: Cold rolled stamped steel

Design: Standard cap with Zerk lube cut-out and rubber push-pop in seal

Installation Type: Drive-in

Package Type: Retail Packaged

Package Quantity: 2

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