19mm ID X 23mm OD X 2mm CS 70A Duro Nitrile O-ring



19mm ID X 23mm OD X 2mm CS 70A Duro Nitrile O-ring



NBR (Buna)


-40°F to 212°F (-40°C to 100°C)

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What is an O-ring?

An O-ring, or torus, is a doughnut-shaped object or mechanical gasket generally made from an elastomer. O-rings can also be made from PTFE, other plastic materials, metals, and be made hollow or solid. O-rings often have a round cross-section.

What Do O-rings Do?

An o-ring?s primary use is for sealing. They are designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface.

O-rings are often used in static (non-moving) applications but are also found in dynamic (moving) applications where there is relative motion between the parts and the o-ring itself.

Dynamic (moving) use examples include: rotating pump shafts and hydraulic cylinder pistons.

Examples of static (non-moving) include: fluid or gas sealing applications in which the o-ring is compressed, resulting in zero clearance.

Some o-rings are made with lobed (x-like) cross-sections to work in both static and dynamic applications.

There are around 20 different types of o-rings available to cover these multiple uses. The common round cross-section is the most versatile. This conventional o-ring can be used in almost any application as long as the gland to contain the o-ring is designed correctly and correct size and material are chosen.

NBR / Buna-N / Buna: The Most Popular O-Ring Material

Characteristics: rubber-like elastomer typically with a dull, matte finish. Some have a shiny finish.

Description: General purpose elastomer with use as a seal energizer or low-pressure applications such as hydraulics and pneumatics. This material is resistant to oils, hydraulic fluids, water fuels, and gases. NBR is not suited for brake fluids. It does have good abrasion resistance and compression set. These also have a high tensile strength

70 Duro Specs

Physical Content Tested

Standard Value

Measured Value

Test Method and Standard

Normal Basic Physical Property

Hardness (Shore A)

75 +- 5



M100, MPA




Tesible Strength , MPA, Min

> 16



Tear Elongation, %, Min

> 300



Proportion, g/cm3





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