OR-NBR70-75-87x2-62-RB50623

O-ring 75.87×2.62 NBR 70 Shore A

This NBR O-ring offers excellent resistance to mineral oils and fuels, making it suitable for a wide range of industrial applications.

SKU: OR-NBR70-75-87x2-62-RB50623
Article number: 50623
Dimensions: 75.87 × 2.62 mm
Material: NBR · 70 Sh A

excl. VAT

From €0.33

€0.41 incl. VAT

In stockWarehouse Považská Bystrica

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In stock in Považská Bystrica — delivery 1–3 business days from dispatch (SK), 3–5 days (EU)

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NBR O-ring 75.87 × 2.62 mm (inner diameter 75.87 mm, cross-section 2.62 mm). Outer diameter 81.11 mm. Hardness 70 Sh A. Temperature range -30 °C to 100 °C. Standard ISO3601-75.87x2.62.

For a static seal of this size (outer diameter 81.11 mm), the ISO 3601-2 / Parker O-Ring Handbook ORD 5700 design guidance recommends a groove depth of about 2.04 mm and a groove width of about 3.41 mm for the 2.62 mm cross-section — roughly 22 % squeeze.

Inner diameter (ID): 75.87 mm
Cross-section (CS): 2.62 mm
Outer diameter (OD): 81.11 mm
Dimensions: 75.87x2.62
Material: NBR
Hardness: 70 Sh A
Colour: black
Temperature range: -30 °C to 100 °C
Standard code: ISO3601-75.87x2.62
ISO 3601 size: 75.87x2.62
SKU: OR-NBR70-75-87x2-62-RB50623
Country of origin: Vietnam
Availability: In stock

Technical specifications

Product data
Material	NBR
Hardness (Shore A)	70 Sh A
Color	black
Certifications	No specific certifications
Indicative values for NBR
Temperature range	-30 °C to 100 °C
Tensile strength	14.4 MPa
Ultimate elongation	389 %
Compression set	11 %
Specific gravity	1.28 g/cm³

These values apply to the NBR material family as a whole, not to this specific size and hardness. Always verify suitability for your specific application before use.

Cross-standard size references

Standard code: ISO3601-75.87x2.62
ISO 3601: 75.87x2.62
DIN 3771: 75.87x2.62

Material properties

Nitrile Butadiene Rubber (NBR) is the most widely used elastomer in industrial sealing technology. It offers very good resistance to mineral oils, HLP-type hydraulic fluids, petrol and diesel fuels, propane and silicone oils. Operating temperature range is -30 °C to +100 °C, short-term up to +120 °C. It has good abrasion resistance, low gas permeability and high tensile strength. NBR is not suitable for contact with glycol-based brake fluid, ester oils, ozone and aromatic hydrocarbons.

Material: NBR
Chemical name: Nitrile Butadiene Rubber
Material grade: Buna-N, Nitril, Perbunan
Trade names: Lanxess Perbunan, Zeon Nipol, LG Kumho KNB

Suitable for various industries

NBR O-rings are routinely used in hydraulic cylinders, pneumatic systems, pumps, compressors, air pressure regulators and general mechanical applications. In automotive industry they seal oil systems, fuel lines and engine peripherals. Also suitable for agricultural and construction machinery.

Application notes

Recommended for hydraulic and pneumatic systems with mineral oils. Do not use with glycol-based brake fluid or aromatic hydrocarbons. In dynamic applications keep operating temperature below +100 °C for long service life.

Advantages

Excellent resistance to mineral oils and HLP-type hydraulic fluids
Resistant to petrol, diesel fuel and propane
Operating temperature range -30 °C to +100 °C (short-term +120 °C)
Good abrasion resistance and mechanical strength
Best price-performance ratio among industrial elastomers

Price tiers

When buying	per piece
from 1 pcs	€0.33
from 10 pcs −12.1%	€0.29
from 100 pcs −27.3%	€0.24
from 1000 pcs −36.4%	€0.21

Prices exclude VAT. The volume discount is applied automatically in the cart.

Documentation

Download datasheet (PDF)

See all materials in size 75.87 × 2.62 mm

Frequently asked questions about this O-ring

What is the temperature range of a NBR O-ring?

This NBR O-ring is rated for continuous service of roughly -30 to 100 °C. The material tolerates brief temperature peaks higher, but near the limits service life drops significantly. If you operate at the edge of the range, ask our technician about a more suitable compound.

What media is NBR resistant to?

NBR belongs to the nitrile/polyurethane family — it resists mineral oils, fuels, and hydraulic fluids, which is why it is the standard in engineering and hydraulics. It is not suited to ozone, strong acids, or polar solvents. For a specific medium, check compatibility in our chemical-resistance chart.

What do the dimensions of this O-ring mean?

The size 75.87 × 2.62 mm gives the inner diameter × cross section. The inner diameter must fit the groove or rod; the cross section sets the seal thickness. When replacing, do not confuse inner diameter with outer diameter. If you search by standard (AS568, ISO 3601, JIS), use our cross-reference finder.

What does 70 Shore A hardness mean?

A hardness of 70 Shore A expresses the stiffness of the rubber: a lower number (50–60) is softer and seals an uneven surface better, a higher one (80–90) better resists pressure and extrusion from the groove. For most common applications the optimum is around 70 Shore A. Under high pressure, choose a harder material and possibly a back-up ring.

Read the NBR material guide