AS568-381 Buna-N 70 Duro Black X-Ring for 12 ID X 3/16 CS

Buna-N X-Rings 70 Duro Black BN700100-X-381

$ 20.47 per Each

Minimum Order Quantity (MOQ): 2

Ships within 14 days

Qty	Price
2 - 3	$15.3525
4 - 7	$13.3055
8 - 14	$11.2585
15 - 29	$9.2115
30+	$8.8700

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
Cross Sectional Shape	X
Hardness	70
Dash	381
Fractional	ID: 12 CS: 3/16 OD: 12-3/8
Actual (Inch)	ID: 11.975 ± 0.065 CS: 0.210 ± 0.005 OD: 12.395
Actual (Metric)	ID: 304.17 ± 1.65 CS: 5.33 ± 0.13 OD: 314.830

Buna-N (Nitrile) X-rings, also known as Quad-rings, are a type of sealing element designed to provide superior sealing performance in dynamic applications. These rings have a unique square cross-section with four contact points, offering better sealing efficiency and lower friction compared to traditional O-rings. Made from a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene, Buna-N X-rings offer excellent resistance to oils, fuels, and a variety of chemicals, making them ideal for a wide range of industrial, automotive, and aerospace applications.

Buna-N X-Ring Recommended Uses

Seals and gaskets in hydraulic systems, automotive fuel systems, industrial machinery, high-pressure applications, dynamic sealing applications, and rotary sealing applications.

Buna-N X-Ring Not Recommended

Brake fluid, ozone, UV exposure, phosphate esters, chlorinated hydrocarbons, aromatic hydrocarbons, ketones, strong acids, atmospheric aging.

Buna-N X-Ring Limitations

Not suitable for ozone, sunlight, or weathering exposure.
Limited performance in high-temperature environments.
Not ideal for strong acids and alkalis.
Not recommended for applications requiring low compression set.

Buna-N X-Ring Usable Temperature Range

-30 to 250°F (-34 to 121°C)

Buna-N X-Ring Also Known As

Buna-N X-Ring, Quad-Ring, Nitrile X-Ring, NBR X-Ring, Nitrile Butadiene Rubber X-Ring.