AS568-257 Buna-N 70 Duro Black FDA & NSF O-Ring for 5-7/8 ID X 1/8 CS

Buna-N O-Rings 70 Duro Black FDA & NSF BN700120-257

$ 0.9694 per Each

Minimum Order Quantity (MOQ): 31

Ships within 14 days

Qty	Price
31 - 36	$0.9694
37 - 78	$0.7270
78 - 154	$0.6301
155 - 309	$0.5332
310 - 618	$0.4362
619+	$0.3878

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	257
Fractional	ID: 5-7/8 CS: 1/8 OD: 6-1/8
Actual (Inch)	ID: 5.859 ± 0.035 CS: 0.139 ± 0.004 OD: 6.137
Actual (Metric)	ID: 148.82 ± 0.89 CS: 3.53 ± 0.10 OD: 155.880

Buna-N (Nitrile) O-rings that are FDA and NSF compliant are made from a high-quality synthetic rubber copolymer of acrylonitrile (ACN) and butadiene, designed to meet strict standards for use in food, beverage, pharmaceutical, and other regulated industries. These O-rings are known for their excellent resistance to oils, fuels, and many chemicals, while being safe for contact with consumables, making them ideal for applications that require compliance with both FDA and NSF standards.

Buna-N FDA & NSF Compliant O-Rings Recommended Uses

Food and beverage processing, pharmaceutical applications, medical devices, water treatment, dairy processing, and other applications requiring strict hygiene standards and chemical resistance.

Buna-N FDA & NSF Compliant O-Rings Not Recommended

Ozone, UV exposure, phosphate esters, chlorinated hydrocarbons, aromatic hydrocarbons, ketones, strong acids, and atmospheric aging.

Buna-N FDA & NSF Compliant O-Rings Limitations

Not suitable for exposure to ozone, UV light, or extreme weather conditions.
Limited resistance to high-temperature environments.
Not ideal for applications requiring resistance to strong acids, alkalis, or ketones.
Not recommended for applications that require low compression set.

Buna-N FDA & NSF Compliant O-Rings Usable Temperature Range

-30 to 250°F (-34 to 121°C)

Buna-N FDA & NSF Compliant O-Rings Also Known As

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