AS568-040 Buna-N 90 Duro Black O-Ring for 2-7/8 ID X 1/16 CS

Buna-N O-Rings 90 Duro Black BN900100-040

$ 0.337 per Each

Minimum Order Quantity (MOQ): 90

Ships within 14 days

Qty	Price
90 - 103	$0.3370
104 - 222	$0.2528
223 - 445	$0.2022
446 - 890	$0.1517
891 - 1780	$0.1179
1781+	$0.1011

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	040
Fractional	ID: 2-7/8 CS: 1/16 OD: 3
Actual (Inch)	ID: 2.864 ± 0.020 CS: 0.070 ± 0.003 OD: 3.004
Actual (Metric)	ID: 72.75 ± 0.51 CS: 1.78 ± 0.08 OD: 76.310

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.