NBR O-Rings: Properties, Applications and Selection Guide | Flow Engineering

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Black NBR O-rings for oil and general industrial sealing applications from Flow Engineering Thailand

FLOW ENGINEERING TECHNICAL KNOWLEDGE

What Is an NBR O-Ring? Properties, Applications and Selection

A widely used O-ring material for oil-related and general industrial sealing applications.

NBR O-rings, manufactured from Nitrile Butadiene Rubber, are among the most commonly used elastomeric sealing components in industrial machinery.

NBR is frequently considered for oil-related and general industrial applications, including hydraulic equipment, lubrication systems, pumps, valves and mechanical assemblies.

Catalogue Data: Flow Engineering lists an operating temperature range of approximately -40°C to +100°C for NBR O-rings.

What Is NBR?

NBR stands for Nitrile Butadiene Rubber, a synthetic elastomer commonly used in industrial seals.

When manufactured as an O-ring, the material forms a circular ring with a round cross section. Compression inside the seal groove creates contact against the mating surfaces and helps control leakage.

Typical NBR O-Ring Applications

  • Hydraulic oil systems
  • Industrial lubrication systems
  • Pumps and valves
  • Hydraulic cylinders
  • Industrial fittings
  • General machinery

Why Is NBR Widely Used?

Common in Oil-Related Applications

NBR is frequently used in applications involving oils and lubrication systems.

General Industrial Use

It is commonly found in hydraulic equipment, valves, pumps, fittings and general machinery.

Broad Size Availability

Because NBR O-rings are widely used, many standard sizes and sealing configurations are available.

How Are NBR O-Rings Sized?

O-ring size is commonly specified as ID × CS.

ID = Inside Diameter

CS = Cross-Section Diameter

For example, an NBR O-ring 30 × 3 mm has a 30 mm inside diameter and a 3 mm cross-section diameter.

What Should Be Checked Before Selecting NBR?

  • Inside diameter and cross section
  • Operating temperature
  • System pressure
  • Oil or process media
  • Static or dynamic application
  • Seal groove and clearance
  • Required elastomer hardness

A Black O-Ring Is Not Always NBR

Colour should not be used as the primary method of identifying an O-ring material because compound colours may vary between manufacturers.

When the original material is unknown, the operating temperature, pressure and process media should be reviewed before selecting a replacement material.

Looking for an NBR O-Ring by Size?

Send us the ID × CS dimensions, product photograph or existing sample, together with the operating conditions for an initial review.

Contact Our Team View Our Products
Flow Engineering and Service Co., Ltd.
Tel. 082 415 6491 | 091 978 2893
LINE: @flowengineering | www.flowengineering.net

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