AS568-339 Buna-N 90 Duro Black O-Ring for 3-1/4 ID X 3/16 CS

Buna-N O-Rings 90 Duro Black BN900100-339

$ 1.17 per Each

Minimum Order Quantity (MOQ): 35

On Backorder

Material	Buna-N
Cross Sectional Shape	Round
Hardness	90
Dash	339
Fractional	ID: 3-1/4 CS: 3/16 OD: 3-5/8
Actual (Inch)	ID: 3.225 ± 0.024 CS: 0.210 ± 0.005 OD: 3.645
Actual (Metric)	ID: 91.92 ± 0.61 CS: 5.33 ± 0.13 OD: 102.580

Buna-N (Nitrile) O-rings are made from a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene. They are among the most widely used sealing materials due to their excellent resistance to oils, fuels, and many chemicals. Nitrile O-rings provide high mechanical strength, outstanding wear resistance, and good tensile strength, making them ideal for automotive, industrial, and aerospace applications.

Buna-N Recommended Uses

Seals and gaskets, fuel systems, hydraulic systems, oil and gas industry, automotive applications, general-purpose applications.

Buna-N Not Recommended

Brake fluid, ozone, UV exposure, phosphate esters, chlorinated hydrocarbons, aromatic hydrocarbons, ketones, strong acids, atmospheric aging.

Buna-N Limitations

Not suitable for ozone, sunlight, or weathering exposure.
Limited performance in high-temperature environmen.
Not ideal for strong acids and alkalis.
Not recommended for applications requiring low compression set.

Buna-N Usable Temperature Range

-30 to 250°F (-34 to 121°C)

Buna-N Also Known As

Buna-N, Nitrile, NBR, Nitrile Butadiene Rubber.