AS568-903 Buna-N 90 Duro Black O-Ring for ID X CS

Buna-N O-Rings 90 Duro Black BN900100-903

$ 0.0408 per Each

Minimum Order Quantity (MOQ): 736

Ships within 14 days

Qty	Price
736 - 857	$0.0408
858 - 1838	$0.0306
1839 - 3676	$0.0245
3677 - 7352	$0.0184
7353 - 14705	$0.0143
14706+	$0.0122

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Product Details

Material	Buna-N
Temperature Range	-40°F to 250°F
Cross Sectional Shape	Round
Hardness	90
Dash	903
Actual (Inch)	ID: 0.301 ± 0.005 CS: 0.064 ± 0.003 OD: 0.429
Actual (Metric)	ID: 7.65 ± 0.13 CS: 1.63 ± 0.08 OD: 10.910

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.