AS568-474 Buna-N 70 Duro Black O-Ring for 25 ID X 1/4 CS

Buna-N O-Rings 70 Duro Black BN700100-474

$ 11.37 per Each

Minimum Order Quantity (MOQ): 3

Ships within 7 days

Qty	Price
3 - 3	$11.3700
4 - 6	$8.5275
7 - 13	$6.8220
14 - 26	$5.1165
27+	$4.3900

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Product Details

Material	Buna-N
Temperature Range	-40°F to 250°F
Cross Sectional Shape	Round
Hardness	70
Dash	474
Fractional	ID: 25 CS: 1/4 OD: 25-1/2
Actual (Inch)	ID: 24.940 ± 0.115 CS: 0.275 ± 0.006 OD: 25.490
Actual (Metric)	ID: 633.48 ± 2.92 CS: 6.99 ± 0.15 OD: 647.460

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.