B70011-NSF Buna-N/NBR 70 Duro O-Ring - FDA, NSF61 Drinking Water

Dimensions: 5/16"ID x 7/16"OD x 1/16"CS

The B70011-NSF is an AS568-011 Buna-N (NBR) 70 duro O-Ring with a 0.301 inch inside diameter and a 0.070 inch cross section. It meets FDA 21 CFR 177.2600 food contact requirements and NSF/ANSI 61 requirements for drinking water system components, making it a fit for potable water and food-contact equipment. It handles operating temperatures from -40 to +225F (-40 to +107C).

Stop leaks and keep your water system compliant with the B70011-NSF Buna-N/NBR O-Ring. This 70 duro seal is built for potable water equipment, food processing lines, and general fluid power applications where a certified compound is required, delivering dependable sealing performance backed by FDA and NSF/ANSI 61 compliance.

Buna-N, also known as Nitrile or NBR, is the most widely used O-Ring compound because of its strong resistance to petroleum oils, fuels, and hydraulic fluids along with good abrasion resistance. The O-Ring Store LLC stocks this AS568-011 size in the certified B70 Buna-N compound for plumbing contractors, water treatment facilities, food and beverage equipment builders, and maintenance teams who need a small, reliable seal that meets drinking water and food-contact standards.

Operating Temperature: -40 to +225F (-40 to +107C)

Material and Performance

Buna-N (Nitrile/NBR) is an excellent general-purpose elastomer known for strong resistance to petroleum oils, hydraulic fluids, and fuels, along with good abrasion resistance and compression set resistance. At 70 duro, this O-Ring balances sealing force with easy installation in standard AS568-011 grooves. This compound is manufactured to meet FDA 21 CFR 177.2600 food contact requirements and NSF/ANSI 61 requirements for drinking water system components, making it suitable for potable water and food-contact service in addition to general industrial use.

• Excellent resistance to: petroleum oils, hydraulic fluids, water, silicone greases, ethylene glycol, fuel (gasoline, diesel), LP gases, mineral oils
• Limited capability with: Skydrol, high-concentration ozone, sunlight (UV), dilute acids
• Not compatible with: ketones (MEK, acetone), esters, chlorinated hydrocarbons, nitro hydrocarbons, strong acids, automotive brake fluid (glycol-based)

Sizes and Measurements

• Dimensions: 5/16"ID x 7/16"OD x 1/16"CS
• Actual: 0.301"ID x 0.441"OD x 0.070"CS
• Metric: 7.65mm ID x 11.20mm OD x 1.78mm CS
• Part Number: B70011-NSF
• AS568 Dash Number: -011

Applications and Use Cases

This AS568-011 Buna-N O-Ring is a good fit for small valves, fittings, water meters, backflow preventers, and plumbing components in potable water and municipal water treatment systems where NSF/ANSI 61 compliance is required. Its FDA-compliant compound also makes it suitable for food and beverage processing equipment, dispensing valves, and small fluid connections. Because Buna-N handles petroleum oils, fuels, and hydraulic fluids well, this same O-Ring also performs reliably in general hydraulic and pneumatic fittings, pumps, and small fluid power components across general industrial applications.

Key Specifications

• Material: Buna-N (Nitrile/NBR)
• Durometer: 70 Shore A
• Color: Black
• Certifications: Meets FDA 21 CFR 177.2600 food contact requirements; meets NSF/ANSI 61 requirements for drinking water system components
• Temperature Range: -40 to +225F (-40 to +107C)

Why Buy from The O-Ring Store LLC

The O-Ring Store LLC is an ISO 9001:2015 certified distributor with USA-based stock for fast delivery. Most in-stock items ship the same day. We offer custom sizes, full lot traceability and documentation on request, including support for FDA and NSF/ANSI 61 certified compound requirements, and expert technical support from staff with decades of sealing experience. Every order is verified through our Olypsys(R) scan-based quality system before it ships. Competitive pricing with no compromise on quality. We make getting O-Rings easy!

Frequently Asked Questions

Q: What are the exact dimensions of the B70011-NSF O-Ring? A: The B70011-NSF is AS568 dash number -011, with a 0.301 inch inside diameter, a 0.070 inch cross section, and a 0.441 inch outside diameter. In metric, that is 7.65mm ID x 1.78mm CS x 11.20mm OD.

Q: Does this O-Ring meet NSF and FDA requirements for drinking water and food contact? A: Yes. The B70011-NSF Buna-N O-Ring meets FDA 21 CFR 177.2600 food contact requirements and NSF/ANSI 61 requirements for drinking water system components, making it suitable for potable water equipment and food-contact applications.

Q: What temperature range does this O-Ring handle? A: This Buna-N 70 duro compound is rated from -40F to +225F (-40C to +107C). It has excellent resistance to petroleum oils and hydraulic fluids but is not compatible with ketones, esters, or chlorinated hydrocarbons, so check chemical compatibility before use in solvent-heavy applications.