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Dexter 10,000lb HD, 12,000 lb, 15,000 lb Trailer Axle 4" Threaded Oil Bath Cap 2PC


Regular price $32.99 USD

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.

Product Overview:

Upgrade your trailer's hub system with this heavy duty 4" oil bath hub cap kit, designed as a direc replacement for Dexter part #21-36. Built for 10K (HD), 12K, and 15K trailer axles, this aftermarket cap features a threaded design with a 4" outer diameter and 12 threads per inch,  ensuring a secure, precise fit on compatible hubs. 

Constructed for durability and long-term performance, the kit includes a rubber fill plug and O-ring to create a tight, leak-resistant seal that helps maintain proper oil levels and protect internal hub components. This cap is ideal for heavy duty towing applications where reliable lubrication is critical. 

Important fitment note: This oil bath cap is not compatible with Dexter 10K  general duty axles manufactured in 2009 or newer (Dexter #21-88 style). Always confirm your hub's thread size and axle type before ordering to ensure proper fit and performance. 

What's include: 

Includes 2 hub caps, 2 o-rings, and 2 plugs

Specifications: 

Outside diameter: 4" 
Thread: 4"-12
Depth: 1-1/2"

OEM Replacement Part Number: 

Replace part number: K71-148-00
Oil caps: 021-036-00
O-Rings: 010-050-00
Plugs: 046-032-00
Fits Dexter 9K hubs (before 2009)
Fits Dexter 10K, 12K, and 15K hubs (before 2009)

Payment & Security

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