91030 Nitrile Unitized Oil Seal – 2.75" × 3.779" Fits AL-KO / Hayes #99 Spindle (10K)
The 91030 Nitrile Unitized Oil Seal provides a tight, reliable barrier for AL-KO / Hayes #99 spindles on 10,000 lb axles. Designed for oil-bath hubs, this precision seal keeps lubricant in and contaminants out — ensuring smooth, long-lasting performance under heavy loads and highway heat.
Constructed from durable Nitrile (Buna-N) rubber bonded to a steel outer shell, the 91030 maintains flexibility across a wide temperature range and resists oil breakdown, water, and road debris. Ideal for commercial, RV, and industrial trailer applications.
| Part Number | Dimensions (ID × OD) | Material |
|---|---|---|
| 91030 | 2.750″ × 3.779″ | Nitrile (Buna-N) with Steel Case |
Features
- Unitized double-lip seal design for superior leak prevention
- Steel outer shell ensures rigidity and precise press-fit
- Spring-loaded sealing lip maintains even pressure under rotation
- Resists heat, petroleum oils, and contamination
- Fits AL-KO / Hayes #99 spindle hubs and 10K oil-bath assemblies
- Cross-references: CR 27438, National 370352, OB27377, AL-KO 010-257-00, Chicago Rawhide 27438
Specifications
| Parameter | Value |
|---|---|
| Inner Diameter (ID) | 2.750″ |
| Outer Diameter (OD) | 3.779″ |
| Width / Depth | ≈ 0.762″ |
| Material | Nitrile (Buna-N) rubber with carbon-steel shell |
| Temperature Range | −40 °F to +250 °F (−40 °C to +121 °C) |
| Axle Rating | 10,000 lb – AL-KO / Hayes #99 spindles |
Fitment
- Fits AL-KO / Hayes #99 spindle hubs on 10K axles
- Designed for oil-bath hub and drum assemblies
- Replaces factory unitized seals in many 10K trailer systems
- Verify ID (2.75″) and OD (3.779″) before installation
Unsure about fitment? Text or call 815-357-3292 — our parts team can confirm the correct seal for your axle.