NBR (Nitrile) O-rings

-30 °C to 100 °C

NBR (Nitrile Butadiene Rubber) is the most widespread elastomer for O-rings. Excellent resistance to mineral oils, fuels, and hydraulic fluids. An economical choice for most standard applications.

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Available to order
O-ring 35×2.8 NBR 70 Shore A
Dimensions
35 × 2.8 mm · OD 40.6 mm
Material
NBR · 70 ShA
Product code OR-NBR70-35x2-8
€0.33excl. VAT
Available to order
O-ring 35×3.2 NBR 70 Shore A
Dimensions
35 × 3.2 mm · OD 41.4 mm
Material
NBR · 70 ShA
Product code OR-NBR70-35x3-2
€0.33excl. VAT
Available to order
O-ring 35×5.3 NBR 70 Shore A
Dimensions
35 × 5.3 mm · OD 45.6 mm
Material
NBR · 70 ShA
Product code OR-NBR70-35x5-3
€0.50excl. VAT
Available to order
O-ring 35×6 NBR 70 Shore A
Dimensions
35 × 6 mm · OD 47 mm
Material
NBR · 70 ShA
Product code OR-NBR70-35x6
€0.50excl. VAT
Available to order
O-ring 35×8 NBR 70 Shore A
Dimensions
35 × 8 mm · OD 51 mm
Material
NBR · 70 ShA
Product code OR-NBR70-35x8
€1.00excl. VAT
Available to order
O-ring 36.27×1.78 NBR 70 Shore A
Dimensions
36.27 × 1.78 mm · OD 39.83 mm
Material
NBR · 70 ShA
Product code OR-NBR70-36-27x1-78
€0.17excl. VAT
Available to order
O-ring 36.2×3 NBR 70 Shore A
Dimensions
36.2 × 3 mm · OD 42.2 mm
Material
NBR · 70 ShA
Product code OR-NBR70-36-2x3
€0.17excl. VAT
Available to order
O-ring 36.2×5.7 NBR 70 Shore A
Dimensions
36.2 × 5.7 mm · OD 47.6 mm
Material
NBR · 70 ShA
Product code OR-NBR70-36-2x5-7
€0.67excl. VAT
Available to order
O-ring 36.5×1.8 NBR 70 Shore A
Dimensions
36.5 × 1.8 mm · OD 40.1 mm
Material
NBR · 70 ShA
Product code OR-NBR70-36-5x1-8
€0.17excl. VAT
Available to order
O-ring 36×1.8 NBR 70 Shore A
Dimensions
36 × 1.8 mm · OD 39.6 mm
Material
NBR · 70 ShA
Product code OR-NBR70-36x1-8
€0.33excl. VAT
Available to order
O-ring 36×3.2 NBR 70 Shore A
Dimensions
36 × 3.2 mm · OD 42.4 mm
Material
NBR · 70 ShA
Product code OR-NBR70-36x3-2
€0.33excl. VAT
Available to order
O-ring 36×4.5 NBR 70 Shore A
Dimensions
36 × 4.5 mm · OD 45 mm
Material
NBR · 70 ShA
Product code OR-NBR70-36x4-5
€0.50excl. VAT
Available to order
O-ring 36×6 NBR 70 Shore A
Dimensions
36 × 6 mm · OD 48 mm
Material
NBR · 70 ShA
Product code OR-NBR70-36x6
€0.50excl. VAT
Available to order
O-ring 36×7 NBR 70 Shore A
Dimensions
36 × 7 mm · OD 50 mm
Material
NBR · 70 ShA
Product code OR-NBR70-36x7
€0.83excl. VAT
Available to order
O-ring 37.1×1.6 NBR 70 Shore A
Dimensions
37.1 × 1.6 mm · OD 40.3 mm
Material
NBR · 70 ShA
Product code OR-NBR70-37-1x1-6
€0.17excl. VAT
Available to order
O-ring 37.21×2.62 NBR 70 Shore A
Dimensions
37.21 × 2.62 mm · OD 42.45 mm
Material
NBR · 70 ShA
Product code OR-NBR70-37-21x2-62
€0.33excl. VAT
Available to order
O-ring 37.2×5.7 NBR 70 Shore A
Dimensions
37.2 × 5.7 mm · OD 48.6 mm
Material
NBR · 70 ShA
Product code OR-NBR70-37-2x5-7
€0.50excl. VAT
Available to order
O-ring 37.3×3.6 NBR 70 Shore A
Dimensions
37.3 × 3.6 mm · OD 44.5 mm
Material
NBR · 70 ShA
Product code OR-NBR70-37-3x3-6
€0.33excl. VAT
Available to order
O-ring 37.47×5.33 NBR 70 Shore A
Dimensions
37.47 × 5.33 mm · OD 48.13 mm
Material
NBR · 70 ShA
Product code OR-NBR70-37-47x5-33
€0.33excl. VAT
Available to order
O-ring 37.5×4.5 NBR 70 Shore A
Dimensions
37.5 × 4.5 mm · OD 46.5 mm
Material
NBR · 70 ShA
Product code OR-NBR70-37-5x4-5
€0.50excl. VAT
Available to order
O-ring 37.77×2.62 NBR 70 Shore A
Dimensions
37.77 × 2.62 mm · OD 43.01 mm
Material
NBR · 70 ShA
Product code OR-NBR70-37-77x2-62
€0.17excl. VAT
Available to order
O-ring 37×1.5 NBR 70 Shore A
Dimensions
37 × 1.5 mm · OD 40 mm
Material
NBR · 70 ShA
Product code OR-NBR70-37x1-5
€0.33excl. VAT
Available to order
O-ring 37×1 NBR 70 Shore A
Dimensions
37 × 1 mm · OD 39 mm
Material
NBR · 70 ShA
Product code OR-NBR70-37x1
€0.33excl. VAT
Available to order
O-ring 37×2.6 NBR 70 Shore A
Dimensions
37 × 2.6 mm · OD 42.2 mm
Material
NBR · 70 ShA
Product code OR-NBR70-37x2-6
€0.33excl. VAT

Temperature and chemical compatibility

Temperature range: -30 °C to +100 °C (short-term up to +120 °C).

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Typical applications: hydraulic cylinders, pneumatic systems, pumps, gearboxes, fuel pumps, automotive industry, general engineering.

NBR (Nitrile)

Each elastomer has different mechanical and chemical properties.

NBR (Nitrile) — properties and applications

NBR (nitrile rubber) is the most widely used and most affordable material for O-rings — for most engineering operations it is the standard first choice, with a reference price of 1×. It works in a temperature range of −30 to +100 °C (briefly up to +120 °C) and its typical hardness is 70 ShA, which makes it a universal sealing element for ordinary conditions. It's a reliable workhorse that covers the vast majority of standard seals without any needless overpaying.

NBR shows its strength with petroleum-based substances: it has excellent resistance to mineral oils, hydraulic fluids and fuels (petrol, diesel), and it copes well with water and air too. This is precisely why NBR O-rings are the go-to choice in hydraulics, pneumatics, fuel and oil systems, and general engineering. Its properties depend on the acrylonitrile (ACN) content: a higher proportion improves oil resistance, while a lower one improves flexibility at low temperatures — so for a specific application we select a tailored compound.

It does, however, have clear limits. Don't use NBR for steam and hot water, glycol-based brake fluids (DOT 3/4), ester and synthetic oils, polar solvents, or strong acids and bases. Watch out for ozone, UV and weathering too: in direct sunlight NBR ages and cracks, so it isn't ideal for a permanently outdoor environment. These limitations determine the service life of the seal — with an aggressive medium, don't experiment; choose a more suitable material instead.

Compared with the other materials, NBR is clearly the best price-to-performance ratio for oil and fuel applications at moderate temperatures. When you need a higher temperature or better wear resistance, step up to HNBR; when aggressive chemistry or high heat come into play, to FKM (Viton®); for water and steam, to EPDM. The conclusion is simple: if you're sealing mineral oil, hydraulics or fuel in the −30 to +100 °C range and want a proven O-ring at the best price, reach for NBR — and save the other materials for the cases where NBR runs up against its limits.

Browse all O-rings across every material.

O-ring material comparison

Indicative values for a quick comparison. Temperature ranges are conservative (continuous service); for a specific medium always verify compatibility or consult a technician.

Material	Temperature range	Mineral oil	Water	Acid	Fuel	Hardness (Sh A)	Relative price (vs NBR)
NBR — your selection	-30 – 100 °C	Excellent	Limited	Avoid	Excellent	70 Sh A	1.0×
HNBR	-30 – 150 °C	Excellent	Limited	Avoid	Excellent	75 Sh A	3.0×
FKM	-20 – 200 °C	Excellent	Limited	Excellent	Excellent	75 Sh A	5.0×
FFKM	-20 – 260 °C	Excellent	Excellent	Excellent	Excellent	75 Sh A	50.0×
EPDM	-40 – 130 °C	Unsafe	Excellent	Excellent	Unsafe	70 Sh A	1.2×
VMQ	-60 – 200 °C	Avoid	Excellent	Avoid	Avoid	70 Sh A	3.5×
PU	-40 – 80 °C	Excellent	Limited	Avoid	Limited	90 Sh A	2.0×

Frequently asked questions about NBR (Nitrile)

Can an NBR O-ring handle contact with petrol and diesel?

Yes. NBR (nitrile) is the standard choice for mineral oils, hydraulic fluids and fuels such as petrol and diesel — which is exactly why it's used in fuel and oil systems. With fuels that have a high aromatic or bioethanol content, however, NBR hardens and swells more quickly; in that case consider HNBR or FKM. For a specific fuel, check compatibility in our chemical-resistance table.

Why shouldn't an NBR O-ring be used for brake fluid or steam?

Glycol-based brake fluids (DOT 3/4) and hot steam attack nitrile — the ring swells, loses its elasticity and stops sealing. For these media the right choice is EPDM. NBR is also unsuitable for ester and synthetic oils, polar solvents, or strong acids and bases; for those, reach for FKM or a special compound.

Which hardness of NBR O-ring should I choose?

For most static and dynamic applications the optimum is 70 Shore A — it seals well while withstanding ordinary pressures. At higher pressure (above roughly 100 bar) or with more clearance in the groove, choose 90 Shore A, or add a back-up ring to prevent the rubber being extruded. Softer compounds (50–60 Shore A) suit uneven or coarser seating surfaces.

NBR material — a guide for O-ring seals
NBR (acrylonitrile-butadiene rubber) is the most common O-ring material for contact with mineral oils and fuels. Properties, temperatures, applications.
Read article

Products

O-ring 35×2.8 NBR 70 Shore A

O-ring 35×3.2 NBR 70 Shore A

O-ring 35×5.3 NBR 70 Shore A

O-ring 35×6 NBR 70 Shore A

O-ring 35×8 NBR 70 Shore A

O-ring 36.27×1.78 NBR 70 Shore A

O-ring 36.2×3 NBR 70 Shore A

O-ring 36.2×5.7 NBR 70 Shore A

O-ring 36.5×1.8 NBR 70 Shore A

O-ring 36×1.8 NBR 70 Shore A

O-ring 36×3.2 NBR 70 Shore A

O-ring 36×4.5 NBR 70 Shore A

O-ring 36×6 NBR 70 Shore A

O-ring 36×7 NBR 70 Shore A

O-ring 37.1×1.6 NBR 70 Shore A

O-ring 37.21×2.62 NBR 70 Shore A

O-ring 37.2×5.7 NBR 70 Shore A

O-ring 37.3×3.6 NBR 70 Shore A

O-ring 37.47×5.33 NBR 70 Shore A

O-ring 37.5×4.5 NBR 70 Shore A

O-ring 37.77×2.62 NBR 70 Shore A

O-ring 37×1.5 NBR 70 Shore A

O-ring 37×1 NBR 70 Shore A

O-ring 37×2.6 NBR 70 Shore A

Temperature and chemical compatibility

Temperature and chemical compatibility

Featured products

NBR (Nitrile)

NBR (Nitrile) — properties and applications

O-ring material comparison

Frequently asked questions about NBR (Nitrile)

Related articles

NBR material — a guide for O-ring seals