AS568-404 Buna-N 70 Duro Black O-Ring for 1-7/8 ID X 1/4 CS

Buna-N O-Rings 70 Duro Black BN700100-404

$ 0.7224 per Each

Minimum Order Quantity (MOQ): 42

Ships within 7 days

Qty	Price
42 - 48	$0.7224
49 - 103	$0.5418
104 - 207	$0.4334
208 - 415	$0.3251
416 - 830	$0.2528
831+	$0.2438

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	404
Fractional	ID: 1-7/8 CS: 1/4 OD: 2-3/8
Actual (Inch)	ID: 1.85 ± 0.015 CS: 0.275 ± 0.006 OD: 2.400
Actual (Metric)	ID: 46.99 ± 0.38 CS: 6.99 ± 0.15 OD: 60.970

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.