91030 Nitrile Unitized Oil Seal – 2.75" × 3.779" Fits AL-KO / Hayes #99 Spindle (10K)
Built for reliability and longevity, the 91030 Nitrile Unitized Oil Seal (2.75" × 3.779") fits AL-KO / Hayes #99 spindles on 10,000 lb axle hubs. Designed for oil-bath lubrication systems, this seal prevents leaks and contamination while withstanding extreme temperature and road conditions. Its Nitrile rubber construction and steel-case design ensure a tight, durable seal every time.
| Part Number | ID / OD (inches) | Material |
|---|---|---|
| 91030 | 2.750″ × 3.779″ | Nitrile (Buna-N) with Steel Case |
Key Features
- High-quality Nitrile (Buna-N) elastomer resists petroleum oils and heat
- Unitized double-lip design provides superior sealing and contaminant protection
- Compatible with AL-KO / Hayes #99 spindles and 10K oil-bath hubs
- Steel outer case ensures rigidity and proper press-fit alignment
- Spring-energized inner lip maintains consistent contact under rotation
- Designed for oil lubrication systems (not grease-only hubs)
- Cross-references: CR 27438 | National 370352 | OB27377 | AL-KO 010-257-00 | Chicago Rawhide 27438
Technical Specifications
| Parameter | Value |
|---|---|
| Inner Diameter (ID) | 2.750″ |
| Outer Diameter (OD) | 3.779″ |
| Width / Depth | ≈ 0.762″ |
| Material | Nitrile (Buna-N) rubber, carbon-steel shell |
| Temperature Range | −40 °F to +250 °F (−40 °C to +121 °C) |
| Axle Type | #99 spindle | 10,000 lb AL-KO / Hayes axles |
Fitment & Notes
- Fits AL-KO / Hayes #99 spindles on 10K axles
- Designed for oil-bath hub/drum assemblies
- Direct replacement for factory unitized seals in many 10K applications
- Not for use in standard grease-packed hubs
Questions about fitment? Text or call 815-357-3292 — we’ll help you find the exact match for your axle and hub setup.
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