These part numbers refer to polyurethane (PU) hydraulic and pneumatic oil seals, commonly formatted as Inner Diameter (ID) × Outer Diameter (OD) × Height/Thickness (H) in millimeters. They are dynamic U-cup or rod/piston seals used to prevent fluid leaks under high pressure and friction. [
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Seal Size Breakdown
- 40-52-6: 40 mm ID, 52 mm OD, 6 mm thickness
- 35-50-6: 35 mm ID, 50 mm OD, 6 mm thickness
- 50-57-10: 50 mm ID, 57 mm OD, 10 mm thickness
- 40-51-7.3: 40 mm ID, 51 mm OD, 7.3 mm thickness
- 40-50-1: 40 mm ID, 50 mm OD, 1 mm thickness (likely a thin shim, gasket, or specialized low-profile wiper seal) [1]
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