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Engineered for brutal operating environments, the UN Series Piston Rod Seal delivers uncompromising performance in forestry, mining, and off-road equipment. As a one-acting sealing element made of 93 Shore imported polyurethane, this hydraulic cylinder rod seal masters extreme conditions while maintaining industry-leading low friction at start-up pressures.
| Parameter | Specification |
|---|---|
| Seal Type | Uni-directional acting |
| Material | High-performance PU (93 Shore A) |
| Pressure Range | ≤32 MPa (4,641 psi) |
| Temperature | -30°C to +80°C |
| Reciprocating Speed | ≤0.8 m/s |
| Media Compatibility | Petroleum oils • Emulsions |
| Critical Feature | Ultra-low friction at <5 MPa |
1. Mobile Machinery Optimization
Low-Pressure Efficiency: 60% lower breakaway force vs. standard seals
Heavy-Duty Synergy: Enhanced sealing when paired with RS step seals at 32 MPa
Shock Absorption: Withstands 25 G vibration in rock drilling equipment
2. Extreme Environment Resilience
Arctic Performance: -30°C cold-start elasticity (tested on John Deere forestry cranes)
Abrasion Resistance: 3x lifespan in silica-rich mining environments
Chemical Stability: Resists hydrolysis in water-glycol emulsions
3. Critical Applications
Logging Equipment: Grapple cylinder rod seals
Mining Shovels: Dipper arm hydraulic systems
Off-Highway Vehicles: Articulated dump truck steering cylinders
Pressure-Specific Requirements
<20 MPa: Standard groove installation
≥20 MPa: Mandatory steel retaining ring (ISO 6194 compliant)
Installation Best Practices
Groove Finish: ≤Ra 0.4μm (DIN 3761)
Edge Preparation: 0.5mm chamfer minimum
Lubrication: Polyurea grease (compatible with PU)
Damage Prevention:
Use installation sleeves for rods <40mm
Never stretch beyond 150% of original diameter
Failure Prevention Features
Anti-extrusion ridge design
Thermal-stable formulation (-30°C to +80°C)
| Sector | Performance Verification | Standard |
|---|---|---|
| Forestry | 8,000hr service in harvester head cylinders | ISO 5688 |
| Mining | 32 MPa/100°C peak resistance in haul truck lifts | ISO 10766 |
| Construction | 0.02 mm³/min leakage at -25°C | DIN 51524 |
Ordering Reference
Rod Ø50.0mm → UN 50 65 10 (65mm OD × 10mm width)
Custom Sizes: UN [Rod Ø][OD][Width]
Compliance: RoHS 3 • REACH • ISO 3601-3
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Main Product:
Hydraulic Seals,
Rod seals,
Piston Seals,
Wiper Seals,
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Seals Supplier
