AS568-272 Buna-N 70 Duro Black O-Ring for 9-1/2 ID X 1/8 CS

Buna-N O-Rings 70 Duro Black BN700100-272

$ 1.48 per Each

Minimum Order Quantity (MOQ): 21

Ships within 7 days

Qty	Price
21 - 23	$1.4800
24 - 50	$1.1100
51 - 101	$0.8880
102 - 202	$0.6660
203+	$0.5898

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	70
Dash	272
Fractional	ID: 9-1/2 CS: 1/8 OD: 9-3/4
Actual (Inch)	ID: 9.484 ± 0.055 CS: 0.139 ± 0.004 OD: 9.762
Actual (Metric)	ID: 240.89 ± 1.40 CS: 3.53 ± 0.10 OD: 247.950

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.