AS568-231 Buna-N 90 Duro Black O-Ring for 2-5/8 ID X 1/8 CS

Buna-N O-Rings 90 Duro Black BN900100-231

$ 0.404 per Each

Minimum Order Quantity (MOQ): 75

Ships within 14 days

Qty	Price
75 - 86	$0.4040
87 - 185	$0.3030
186 - 371	$0.2424
372 - 742	$0.1818
743+	$0.1485

Ordering in large quantities? Ask for a lead time quote — we'll get back to you with pricing and lead time.

Product Details

Material	Buna-N
Temperature Range	-40°F to 250°F
Cross Sectional Shape	Round
Hardness	90
Dash	231
Fractional	ID: 2-5/8 CS: 1/8 OD: 2-7/8
Actual (Inch)	ID: 2.609 ± 0.020 CS: 0.139 ± 0.004 OD: 2.887
Actual (Metric)	ID: 66.27 ± 0.50 CS: 3.53 ± 0.10 OD: 73.330

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.