AS568-255 Buna-N 70 Duro Black FDA O-Ring for 5-5/8 ID X 1/8 CS

Buna-N O-Rings 70 Duro Black FDA BN700101-255

$ 1.01 per Each

Minimum Order Quantity (MOQ): 30

Ships within 10 days

Qty	Price
30 - 34	$1.0100
35 - 74	$0.7575
75 - 148	$0.6060
149 - 297	$0.4545
298+	$0.4032

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	255
Fractional	ID: 5-5/8 CS: 1/8 OD: 5-7/8
Actual (Inch)	ID: 5.609 ± 0.035 CS: 0.139 ± 0.004 OD: 5.887
Actual (Metric)	ID: 142.47 ± 0.89 CS: 3.53 ± 0.10 OD: 149.530

FDA-approved Buna-N (Nitrile) O-rings are made from a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene, specially formulated to meet the Food and Drug Administration (FDA) requirements for food contact applications. These O-rings offer excellent resistance to oils, fuels, and many chemicals while being compliant with FDA regulations for safe use in food processing, pharmaceutical, and medical industries. FDA Buna-N O-rings provide high mechanical strength, outstanding wear resistance, and good tensile strength, making them ideal for sanitary applications.

FDA Buna-N Recommended Uses

Seals and gaskets for food and beverage processing, pharmaceutical applications, medical devices, sanitary sealing applications, food handling equipment, and laboratory applications.

FDA Buna-N Not Recommended

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

FDA Buna-N 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.

FDA Buna-N Usable Temperature Range

-30 to 250°F (-34 to 121°C)

FDA Buna-N Also Known As

FDA Buna-N, Nitrile, NBR, Nitrile Butadiene Rubber (FDA Compliant).