AS568-221 Buna-N 90 Duro Black O-Ring for 1-7-16 ID X 1/8 CS

Buna-N O-Rings 90 Duro Black BN900100-221

$ 0.251 per Each

Minimum Order Quantity (MOQ): 120

Ships within 14 days

Qty	Price
120 - 139	$0.2510
140 - 298	$0.1883
299 - 597	$0.1506
598 - 1195	$0.1129
1196 - 2390	$0.0878
2391+	$0.0753

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	221
Fractional	ID: 1-7-16 CS: 1/8 OD: 1-11/16
Actual (Inch)	ID: 1.421 ± 0.012 CS: 0.139 ± 0.004 OD: 1.699
Actual (Metric)	ID: 36.09 ± 0.30 CS: 3.53 ± 0.10 OD: 43.150

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.