AS568-348 Buna-N 70 Duro Black X-Ring for 4-3/8 ID X 3/16 CS

Buna-N X-Rings 70 Duro Black BN700100-X-348

$ 5.18 per Each

Minimum Order Quantity (MOQ): 6

Ships within 14 days

Qty	Price
6 - 6	$5.1800
7 - 14	$3.8850
15 - 28	$3.3670
29 - 57	$2.8490
58 - 115	$2.3310
116+	$2.2500

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	348
Fractional	ID: 4-3/8 CS: 3/16 OD: 4-3/4
Actual (Inch)	ID: 4.350 ± 0.030 CS: 0.210 ± 0.005 OD: 4.770
Actual (Metric)	ID: 110.49 ± 0.76 CS: 5.33 ± 0.13 OD: 121.150

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.