NBR 70 O-Rings: The Reliable All-Round Sealing Solution
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When it comes to sealing solutions, one material stands above the rest for versatility, availability and performance — NBR 70 O-rings.
Used across automotive, industrial and general engineering applications, NBR 70 is often the go-to choice for everyday sealing tasks.
But what makes it so widely used?
What Are NBR 70 O-Rings?
NBR stands for nitrile rubber, a synthetic elastomer known for its excellent resistance to oils and fuels.
The number 70 refers to the Shore A hardness, which represents a balanced level of:
- flexibility
- durability
- sealing performance
This makes NBR 70 O-rings suitable for a huge range of applications.
Why NBR 70 O-Rings Are So Widely Used
A True All-Rounder
NBR 70 offers a combination of properties that make it ideal for general-purpose sealing:
- good flexibility for easy installation
- strong sealing performance under moderate pressure
- reliable performance across a wide temperature range
It’s often the default choice when no extreme conditions are present.
Excellent Oil & Fuel Resistance
One of the biggest advantages of nitrile is its compatibility with:
- engine oils
- gearbox oils
- hydraulic fluids
- diesel and petrol
This is why NBR 70 O-rings are commonly used in automotive and mechanical systems.
Wide Temperature Range
NBR 70 typically operates between:
−20°C to +100°C
This covers the majority of everyday applications, from machinery to vehicle systems.
Cost-Effective Without Compromise
Compared to more specialist materials like FKM (Viton®), NBR offers:
- strong performance
- wide availability
- lower cost
This makes it a practical solution for both trade and individual buyers.
Common Uses for NBR 70 O-Rings
Automotive Applications
NBR 70 O-rings are widely used in:
- engines
- gearboxes
- fuel systems
- oil sealing points
Hydraulic & Pneumatic Systems
Used in:
- hydraulic fittings
- pumps
- air systems
where moderate pressure sealing is required.
General Engineering
Perfect for:
- machinery
- maintenance repairs
- everyday sealing jobs
Why Quality Matters with NBR 70 O-Rings
Not all O-rings are created equal.
A high-quality NBR 70 O-ring should offer:
- consistent material composition
- accurate sizing
- good elasticity and recovery
- resistance to cracking or premature wear
Poor-quality O-rings can lead to:
- leaks
- system failure
- unnecessary downtime
That’s why sourcing from a reliable supplier is key.
NBR 70 O-Rings at Seal With Selo
At Seal With Selo, we focus on supplying quality NBR 70 O-rings you can rely on.
Our range includes:
- metric and BS (imperial) sizes
- no minimum order quantities
- live stock availability
- same-day dispatch before cut-off
Whether you need a single O-ring or larger quantities, we aim to make sourcing simple and reliable.
When to Choose NBR 70 (and When Not To)
Choose NBR 70 when:
- sealing oils or fuels
- working in moderate temperatures
- general-purpose sealing
Shop here: Nitrile (NBR) O-Rings – Fuel, Oil & Hydraulic Seals | SealWithSelo – Seal with Selo
Consider alternatives when:
- temperatures exceed ~100°C → FKM (Viton®) Buy FKM Rubber O-Rings | Viton® FKM O-Ring Seals – SELO – Seal with Selo
- sealing water or brake fluid → EPDM EPDM O-Rings – Water, Steam & Brake Fluid Seals | SealWithSelo – Seal with Selo
- high pressure / extrusion risk → NBR 90 Nitrile (NBR) O-Rings – Fuel, Oil & Hydraulic Seals | SealWithSelo – Seal with Selo
Choosing the right material ensures long-term performance.
In Summary
NBR 70 O-rings are popular for a reason — they offer a reliable, cost-effective and versatile sealing solution.
If your application involves:
- oils or fuels
- moderate temperatures
- general engineering use
then NBR 70 is often the best starting point.