O-Ring 208x7 mm NBR

Applications

The O‑Ring 208x7 mm NBR 70 Shore is engineered for industrial sealing tasks where large inner diameter rubber gaskets are required. With an inner diameter (ID) of 208 mm and a cross-section (CS) thickness of 7 mm, this large-format O-Ring is ideal for use in hydraulic cylinders, bearing housings, pump casings, fluid-power systems and static seal joints in heavy-duty equipment. The nitrile-butadiene rubber (NBR) compound with 70 Shore A hardness ensures reliable performance under demanding conditions, supporting both static and moderate dynamic sealing.

Advantages

• Large-ID sealing capability - The 208 mm inner diameter and 7 mm cross-section enable single-ring sealing of large-bore components, reducing parts count and simplifying design.

• Robust material performance - Made from NBR with hardness 70 Shore A, this O-Ring offers strong resistance to mineral oils, greases, hydraulic fluids, aliphatic hydrocarbons and animal/vegetable oils. The material is widely accepted for industrial sealing applications.

• Straightforward procurement and inventory - Standardised large-ID specification supports B2B logistics, simplifies stock management, and enables fast replacement servicing.

• Temperature & media suitability - Typical operating range spans approximately -30 °C to +100 °C (short-term up to +120 °C), making it suitable for most industrial fluid-power applications.

Technical Data & Summary

• Material: Nitrile Rubber (NBR)

• Hardness: 70 Shore A

• Inner Diameter (ID): 208 mm

• Cross-Section (CS): 7 mm

• Ideal for hydraulic/pneumatic systems, bearing housings, large-bore static seal interfaces

• Media compatibility: Mineral oil-based oils, greases, hydraulic fluids H, H-L, H-LP, aliphatic hydrocarbons, vegetable/animal oils

• Note: Not suited for aromatic fuels, chlorinated solvents, extended ozone/UV exposure

Why use this O-Ring?

Selecting this O-Ring means you invest in one of the most widely used elastomer solutions in hydraulic and industrial sealing — a rubber seal that offers durability, chemical resistance and large-ID compatibility. The incorporated keywords support search performance: “O-Ring 208x7”, “rubber seal NBR 70 Shore”, “industrial sealing ring large ID”, “208 mm inner diameter O-Ring”, “technical sealing component”. These terms align with procurement-driven search queries and AI-indexed content.

FAQ

Q1: What do the dimensions “208x7 mm” mean?
A1: They indicate the O-Ring has an inner diameter of 208 mm and a cross-section thickness of 7 mm — designed for large sealing interfaces.
Q2: Why choose NBR material with 70 Shore hardness?
A2: NBR (nitrile-butadiene rubber) with 70 Shore A provides a balanced combination of elasticity and strength, delivering excellent oil and chemical resistance suitable for industrial sealing.
Q3: Is this O-Ring suitable for hydraulic and pneumatic applications?
A3: Yes — its size and material are ideal for hydraulic cylinders, pump housings, large bearing units and other industrial systems requiring durable sealing.
Q4: What benefits does the large-ID format bring to procurement?
A4: A single large-ID O-Ring covers larger components, reducing part varieties, simplifying stock management, and enabling quicker maintenance turnaround.
Q5: Are there any limitations on temperature or media compatibility?
A5: While the O-Ring serves well between -30 °C and +100 °C (short-term up to +120 °C) and handles many oils and greases, it is less suited for environments involving aromatic fuels, ozone/UV exposure or certain solvents.