Overview
The Atlas Cylinders 4B00S050S piston seal kit is a factory-engineered replacement seal assembly designed specifically for 5″ bore Atlas A-series hydraulic cylinders. This complete kit addresses piston wear, leakage, and efficiency loss in industrial fluid power applications. Nitrile elastomer construction ensures compatibility with standard hydraulic fluids and delivers long service life in demanding mobile equipment, construction machinery, and plant operations.
Key Features
- Complete piston seal kit with all required components included
- Nitrile (NBR) material compatible with standard hydraulic oils and mineral-based fluids
- Includes 2 U-seals, 2 HP URE backup rings, and 2 O-ring head seals per kit
- Designed for Atlas A-series cylinders with 5″ bore and 5″ rod
- Direct replacement maintains original cylinder performance and seal integrity
- Reduces downtime and extends cylinder service life
Technical Specifications
| Bore Size | 5″ (127 mm) |
| Rod Size | 5″ |
| Material | Nitrile (NBR) U-seals; HP URE backup rings; NBR O-ring head seals |
| Fluid Compatibility | Standard hydraulic oils, mineral-based fluids |
| Kit Contents | 2 U-seals, 2 backup rings, 2 O-ring head seals |
| Cylinder Series | Atlas A Series |
| Weight | 0.30 lbs |
| Part Number | 4B00S050S |
Typical Applications
- Mobile equipment hydraulic systems (loaders, excavators, skid steers)
- Construction machinery and heavy equipment
- Industrial automation and positioning cylinders
- Forestry and agricultural equipment
- Fluid power systems requiring seal replacement and renewal
- Maintenance and repair of tie-rod hydraulic cylinders
Compatibility & Replacements
Compatible With
- Atlas Cylinders A-Series (5″ bore cylinders)
- Hydraulic systems using standard mineral-based ISO VG 46 fluids
- Tie-rod and welded-rod cylinder configurations
- Equipment utilizing 5″ bore / 5″ rod piston assemblies
Replaces / Drop-In Replacement For
- Original Atlas Cylinders 4B00S050S piston seals
- OEM seal kits for Atlas A-series 5″ bore piston assemblies
- Worn or leaking piston seal assemblies in compatible cylinders
Works With
- Standard hydraulic systems using ISO VG 32 to VG 68 mineral oils
- Cylinders with SAE ported end connections
- Both rod-end and cap-end seal applications
- Temperature ranges typical to industrial hydraulic equipment (standard industrial mineral oil range)
