O-ring 70x4.5 NBR 70 ShA

Key Features & Applications

This O-ring 70x4.5 NBR 70 ShA is a robust sealing ring manufactured from nitrile rubber (NBR) with a hardness of 70 Shore A. Its internal diameter is 70 mm, and its cross-section (thickness) is 4.5 mm. This size makes it well-suited for many industrial, hydraulic, and fluid-handling systems requiring reliable static seals or moderate dynamic sealing.

Because NBR (nitrile butadiene rubber) offers strong resistance to oils, greases, and many petroleum-based fluids, this O-ring is frequently used in engine compartments, hydraulic systems, pumps, valves, fuel systems, and machinery where leakage control is critical. Many suppliers list this specification in standard O-ring catalogs.

Typical operating temperature range is approximately -30 °C to +100 °C (with short excursions possible beyond).
Its hardness (70 ShA) gives a balance: enough firmness to maintain shape under pressure, yet sufficient elasticity to form tight seals in grooves or shafts.

Benefits & Technical Strengths

• Excellent oil & fuel resistance — ideal for lubrication, fuel, hydraulic environments

• Stable sealing performance in static joints and mild dynamic conditions

• Proper geometric match with 70 mm ID and 4.5 mm cross-section

• Durable under moderate loads thanks to 70 ShA hardness

• Cost-effective & standardized — easy to source or replace

• Broad compatibility — fits many standard grooves, pumps, assemblies

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FAQ (H2)

Q1: Will this O-ring 70x4.5 NBR 70 ShA fit my part?
A1: Measure the internal diameter (should be ~70 mm) and the groove or sealing gap’s cross-section (4.5 mm). If both match, this O-ring is appropriate.

Q2: Is NBR 70 ShA suitable for oil, grease, and fuel contact?
A2: Yes — NBR (nitrile rubber) is widely used in oil, grease, and fuel systems due to its resistance to nonpolar fluids and good mechanical stability.

Q3: What temperature range can it handle?
A3: Typically from -30 °C to +100 °C in continuous use. Occasional short-term excursions beyond this are possible depending on environment and fluid compatibility.

Q4: Can it be used in moving (dynamic) applications?
A4: It is best in static seals. In dynamic conditions (reciprocating or rotating shafts), performance depends on speed, surface finish, and lubrication. In mild dynamic settings, it may perform acceptably.

Q5: How quickly can I get it if I order today?
A5: We hold stock at 📍 Warehouse & Store: Lublin, ul. Smoluchowskiego 1, building 4. 🚚 24h shipping - fast and efficient order processing — so you can often receive it the next business day in many locations.

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