An IDI hydraulic rod seal is a U-ring type, single-acting rod seal designed specifically for hydraulic cylinder piston rods. It features a short internal sealing lip and an asymmetrical lip design, making it one of the most critical sealing components in any fluid power system . The primary function of an IDI seal is to prevent hydraulic fluid from leaking out of the cylinder to the outside, ensuring efficient equipment operation and preventing environmental contamination. SANPING SEAL offers high-performance IDI series seals engineered for demanding engineering machinery applications.

What are the key technical specifications of SANPING SEAL IDI seals?
Based on industry standards and SANPING SEAL’s manufacturing capabilities, our IDI series seals deliver the following performance parameters :

Material: High-performance polyurethane (PU) with 93 Shore A hardness
Pressure rating: Up to 400 bar (40 MPa) for standard applications; specialized versions can handle up to 70 MPa
Temperature range: -35°C to +110°C, depending on material grade
Operating speed: 0.03 to 1.0 m/s
Compatible media: Mineral oil-based hydraulic fluids, barely flammable hydraulic fluids, water, air, and other industrial media

The IDI seal features an oversized cup diameter relative to the groove diameter, which creates a superior sealing effect under both low and high pressure conditions .
What makes IDI seals different from other rod seal types?

IDI seals belong to the U-cup hydraulic seal family, but they have distinct characteristics that set them apart :

Compared to ISI seals: The IDI features a thickened lip design, providing stronger pressure resistance. ISI seals have a smaller cross-section design and are suitable for lower pressure applications. Choose IDI for heavy-duty, high-pressure environments.

Compared to ODI seals: ODI seals feature a double lip design with a slightly textured surface, enhancing grip for more demanding applications. IDI has a single lip, soft and pliable design, suitable for internal sealing flexibility .

Compared to UN seals: UN seals are single lip with a smooth surface for various general applications. IDI is specifically optimized for rod sealing with a shorter internal lip design .

Which equipment and applications use IDI seals?
IDI rod seals are widely used across the engineering machinery industry :

Mobile hydraulics:

• Excavators – hydraulic cylinder rod sealing
• Loaders – boom and bucket cylinder applications
• Bulldozers – blade and ripper cylinder seals
• Dump trucks – hoist cylinder sealing

Industrial applications:

• Machine tools – hydraulic clamping systems
• Presses – forming and stamping equipment
• Injection molding machines – clamping unit cylinders
• Standard hydraulic cylinders – general industrial use

SANPING SEAL’s IDI series seals are designed to fit standard groove dimensions compliant with NOK IDI series specifications, ensuring easy replacement and compatibility with major equipment brands .

Why choose SANPING SEAL IDI seals for your heavy equipment?
SANPING SEAL combines 17 years of export expertise with engineering machinery specialization to deliver IDI seals that excel in demanding conditions :

First, exceptional wear resistance. Our PU material provides outstanding abrasion resistance, significantly extending seal service life in high-cycle applications.

Second, high-pressure performance. With pressure ratings up to 400 bar and strong resistance to extrusion, SANPING SEAL IDI seals maintain reliable sealing even under shock loads and pressure peaks.

Third, wide temperature tolerance. Operating effectively from -35°C to +110°C, our IDI seals perform reliably in extreme weather conditions and high-temperature operating environments.

Fourth, easy installation. The optimized lip design and precise dimensional tolerances (±0.01mm to ±3.05mm) ensure straightforward installation and proper fit .

As our positioning states: SANPING SEAL – Engineering Machinery High-End Seals – 17 Years Export Expertise. You get both product quality and service reliability.

What sizes and custom options are available?
SANPING SEAL offers IDI seals in a wide range of standard and custom sizes :
Common dimensions available:

• 80×93×9 mm
• 80×95×9 mm
• 80×90×6 mm
• 80×90×8 mm
• 80×93×10 mm

Customization options:

• Non-standard dimensions available upon request
• Material blends for enhanced thermal or chemical resistance
• Color options: orange, blue, red, ivory, or natural

Quality assurance:

• Pre-production sample approval before mass production
• Final inspection before shipment
• Tolerance control to meet customer specifications

CTA:
Need IDI rod seals for your excavator, loader, or other heavy equipment? [Contact SANPING SEAL] – tell us your cylinder model, dimensions, and operating conditions. We will provide a free quote and recommend the right seal within 24 hours. SANPING SEAL – Engineering Machinery High-End Seals – 17 Years Export Expertise.