AS568-109 Buna-N 90 Duro Black O-Ring for 5/16 ID X 3/32 CS

Buna-N O-Rings 90 Duro Black BN900100-109

$ 0.0516 per Each

Minimum Order Quantity (MOQ): 582

Ships within 14 days

Qty	Price
582 - 678	$0.0516
679 - 1453	$0.0387
1454 - 2906	$0.0310
2907 - 5813	$0.0232
5814 - 11627	$0.0181
11628+	$0.0155

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Product Details

Material	Buna-N
Temperature Range	-40°F to 250°F
Cross Sectional Shape	Round
Hardness	90
Dash	109
Fractional	ID: 5/16 CS: 3/32 OD: 1/2
Actual (Inch)	ID: 0.299 ± 0.005 CS: 0.103 ± 0.003 OD: 0.505
Actual (Metric)	ID: 7.59 ± 0.13 CS: 2.62 ± 0.08 OD: 12.830

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.