AS568-042 Buna-N 90 Duro Black O-Ring for 3-1/4 ID X 1/16 CS

Buna-N O-Rings 90 Duro Black BN900100-042

$ 0.481 per Each

Minimum Order Quantity (MOQ): 63

Ships within 14 days

Qty	Price
63 - 72	$0.4810
73 - 155	$0.3608
156 - 311	$0.2886
312 - 623	$0.2164
624 - 1247	$0.1683
1248+	$0.1443

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Product Details

Material	Buna-N
Temperature Range	-40°F to 250°F
Cross Sectional Shape	Round
Hardness	90
Dash	042
Fractional	ID: 3-1/4 CS: 1/16 OD: 3-3/8
Actual (Inch)	ID: 3.239 ± 0.024 CS: 0.070 ± 0.003 OD: 3.379
Actual (Metric)	ID: 82.27 ± 0.61 CS: 1.78 ± 0.08 OD: 85.830

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.