Description
The Dexter® Fortress Threaded Cap (Part K21-305-00) is a genuine Dexter premium threaded grease/oil cap designed for heavy-duty 10,000 – 16,000 lb trailer axles. Featuring a larger, conveniently accessible side fill/drain plug, this innovative cap streamlines maintenance tasks for both oil and grease applications.
Key Features
- Part Number: K21-305-00
- Brand: Dexter® Axle
- Capacity: 10,000 – 16,000 lbs
- Compatibility: Fits Dexter and Lippert axles
- Style: Fortress Threaded Cap
- Quality: Genuine Dexter® OEM part with superior bearing protection
Backed by over 60 years of trusted technology, the Fortress line offers next-level bearing protection. This threaded cap is engineered for durability and convenience, making axle maintenance faster and easier while protecting your investment.
Backed by Dexter’s 5-year warranty.
Questions about this Dexter Fortress threaded cap or compatibility with your axle? Call our trailer experts at 1-800-866-3336.
Browse more Dexter Fortress Caps.
| DEXTER KIT | Description | Threaded Diameter | Threaded Depth |
| K21-305-00 | Fortress Threaded Cap – 10,000 – 16,000 lbs. (Lippert) | 4.000” | 0.570” |
Replacement Cross-Reference
| Brand | Part Number(s) |
| Kit | K21-305-00 |
| Capacity | 10K-16K lbs. |
| Dexter |
K21-298-00 |
| AL-KO | — |
| Rockwell | — |
| Valcrum | ST-400L-AM |
| Lippert | 693935 |
| Dx Part No | Quantity | Description |
| 010-258-00 | 1 | O-Ring |
| 021-305-00 | 1 | Threaded Aluminum Oil Cap, Fortress |
