Polyurethane (PU) hydraulic cylinder oil seals — pack of 5 Key benefits Reliable oil resistance: Made from polyurethane (PU) to resist hydraulic oil and maintain sealing performance. Lower friction, smoother operation: The low-friction design reduces mechanical resistance, helping cylinders run more smoothly and improving overall energy efficiency. Versatile compatibility: Designed to fit a wide range of piston/shaft sizes and configurations, giving flexibility across different machines and applications. Simple replacement pack: Five identical seals per set allow multiple repairs or spare stocking. Product details Material: Polyurethane (PU) — excellent oil resistance. Quantity: 5 pieces per pack. Example size format: ZB 18x34x8 mm. Size format is AD x ID x TH (AD = outer diameter, ID = inner diameter, TH = thickness). Confirm AD x ID x TH to match your cylinder dimensions. Function: Hydraulic cylinder oil seal for pistons/rod applications; controls oil leakage and maintains pressure in hydraulic systems. Performance: Engineered to reduce friction at the sealing surface while preserving a tight oil seal for reliable hydraulic operation. Why customers choose these seals Prevents fluid leakage that can degrade system performance or cause downtime. Reduces mechanical drag to lower power losses and improve responsiveness. Compatible with many shaft sizes so you can replace worn seals without redesigning components. Typical applications Construction and earthmoving equipment hydraulic cylinders (e.g., excavator booms, loaders). Industrial hydraulic machinery such as presses, lifts, and material handling equipment. Automotive hydraulic systems including suspension struts and steering cylinders. Installation notes Verify the AD x ID x TH dimensions of your existing seal or cylinder bore before ordering. Replace seals in matched sets when possible to ensure consistent sealing performance. Materials and sizing are consistent with the original specification: polyurethane construction, low-friction hydraulic cylinder oil seal, 5 pieces per pack, example size ZB 18x34x8 mm (AD x ID x TH).