AS568-014 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

Dimensions: 1/2"ID X 5/8"OD X 1/16"CS

B70014 is an AS568-014 Buna-N Nitrile 70 Duro black O-Ring used for general-purpose sealing in oil, fuel, hydraulic fluid, pneumatic, and industrial equipment applications. It provides reliable leak prevention, good abrasion resistance, and strong value for maintenance, repair, OEM, and distribution customers.

The B70014 AS568-014 Buna-N 70 Duro O-Ring is built for customers who need a dependable, cost-effective seal that helps prevent leaks and reduce downtime. This black NBR O-Ring is a strong choice for petroleum-based oils, hydraulic fluids, fuels, air, water, and many general industrial sealing applications.

Buna-N Nitrile 70 durometer gives a practical balance of flexibility, compression strength, and wear resistance. It is commonly used by repair shops, OEMs, maintenance teams, and distributors that need a reliable standard AS568 O-Ring that is easy to source and easy to replace.

Operating Temperature

Operating temperature: -40° to +225°F (–40° to +107°C)

Material & Performance Details

Buna-N, also known as Nitrile or NBR, is one of the most widely used O-Ring compounds because it performs well in petroleum-based oils, greases, fuels, and hydraulic fluids. This 70 durometer black compound provides good compression set resistance, abrasion resistance, and general-purpose sealing performance.

Excellent resistance to:

• Petroleum-based oils
• Hydraulic fluids
• Diesel fuel
• Mineral oils
• Grease
• Air
• Water
• Aliphatic hydrocarbons

Limited capability with:

• Weather and ozone exposure
• Some diluted acids
• Some mild chemicals
• Short-term water exposure depending on application

Not compatible with:

• Brake fluid
• Ketones
• Strong acids
• Ozone-heavy outdoor exposure
• Chlorinated hydrocarbons
• Aromatic hydrocarbons
• Skydrol® and phosphate ester fluids

Sizes & Measurements

• Dimensions: 1/2"ID X 5/8"OD X 1/16"CS
• Actual: 0.489"ID X 0.629"OD X 0.070"CS
• Metric: 12.42mm ID X 15.98mm OD X 1.78mm CS
• Part Number: B70014
• AS568 Dash Number: AS568-014

Applications & Use Cases

The B70014 Buna-N 70 Duro O-Ring is used in general sealing applications where oil resistance, fuel resistance, and dependable compression are needed. Common uses include hydraulic systems, pneumatic tools, pumps, valves, automotive equipment, industrial maintenance, repair kits, small engines, cylinders, fittings, and general MRO work.

Key Specifications

• Material: Buna-N Nitrile, NBR
• Durometer: 70 Shore A
• Color: Black
• Standard: AS568-014
• Temperature Range: -40° to +225°F (–40° to +107°C)
• Certifications: Standard industrial grade, certifications available on request when applicable
• Pressure Rating: Application dependent based on gland design, clearance gap, temperature, and system pressure

Why Buy from The O-Ring Store LLC

The O-Ring Store LLC makes getting O-Rings easy by combining fast stock availability with real technical support. Our ISO9001:2015 certified quality processes help customers buy with confidence, reduce mistakes, and keep equipment running.

We stock standard AS568 O-Rings in the USA for fast delivery, with same-day shipping available on in-stock items. Custom sizes are available when standard sizes do not fit the job. Full lot traceability and documentation are available on request, and our experienced staff can help with material selection, sizing, and application questions. You get competitive pricing without giving up quality, support, or accountability.

FAQs

What is the B70014 O-Ring used for?
The B70014 AS568-014 Buna-N O-Ring is used for general-purpose sealing in pumps, valves, hydraulic equipment, pneumatic tools, automotive systems, and industrial maintenance applications.

Is Buna-N 70 Duro good for oil and fuel?
Yes. Buna-N Nitrile 70 Duro is a strong choice for petroleum-based oils, grease, diesel fuel, and many hydraulic fluids.

Is this O-Ring the same as AS568-014?
Yes. B70014 is The O-Ring Store LLC model number for the AS568-014 Buna-N 70 Duro black O-Ring.