AS568-203 Buna-N 70 Duro Black X-Ring for 5/16 ID X 1/8 CS

Buna-N X-Rings 70 Duro Black BN700100-X-203

$ 0.3213 per Each

Minimum Order Quantity (MOQ): 94

Ships within 14 days

Qty	Price
94 - 108	$0.3213
109 - 236	$0.2410
234 - 466	$0.2088
467 - 933	$0.1767
934+	$0.1574

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	203
Fractional	ID: 5/16 CS: 1/8 OD: 9/16
Actual (Inch)	ID: 0.296 ± 0.005 CS: 0.139 ± 0.004 OD: 0.574
Actual (Metric)	ID: 7.52 ± 0.13 CS: 3.53 ± 0.10 OD: 14.580

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.