AS568-015 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

Dimensions: 9/16"ID X 11/16"OD X 1/16"CS

The B70015 AS568-015 Buna-N Nitrile 70 Duro O-Ring is a black NBR sealing ring used for dependable leak prevention in general-purpose hydraulic, pneumatic, oil, fuel, pump, valve, and industrial sealing applications. This O-Ring has a 0.551" actual inside diameter and 0.070" cross section, matching AS568-015 standard sizing.

The B70015 Buna-N Nitrile 70 Duro O-Ring is built for customers who need a reliable, easy-to-source seal for standard grooves and common industrial repairs. Buna-N, also called NBR or nitrile, is one of the most widely used O-Ring materials because it performs well with petroleum oils, fuels, hydraulic fluids, and many general-purpose sealing applications. The 70 durometer hardness gives a strong balance of flexibility, sealing force, and durability, helping reduce leaks, downtime, and repeat maintenance.

Operating Temperature

Operating temperature: -40° to +250°F (–40° to +121°C)

Material & Performance Details

Buna-N Nitrile, commonly called NBR, is a dependable synthetic rubber compound used in many oil, fuel, and hydraulic sealing applications. This B70015 O-Ring is manufactured from black 70 durometer Buna-N, giving it good abrasion resistance, compression set resistance, and sealing performance in static and light dynamic applications.

• Excellent resistance to:
  • Petroleum-based oils
  • Hydraulic fluids
  • Diesel fuel
  • Gasoline
  • Grease
  • Mineral oil
  • Water
  • Mild chemicals
• Limited capability with:
  • Some alcohols
  • Silicone oils
  • Low-aromatic fuels
  • Moderate outdoor exposure
• Not compatible with:
  • Ozone exposure
  • Strong acids
  • Ketones
  • Brake fluids
  • Phosphate ester hydraulic fluids
  • Chlorinated hydrocarbons

Sizes & Measurements

• Dimensions: 9/16"ID X 11/16"OD X 1/16"CS
• Actual: 0.551"ID X 0.691"OD X 0.070"CS
• Metric: 14.00mm ID X 17.56mm OD X 1.78mm CS
• Part Number: B70015
• AS568 Dash Number: AS568-015
• Cross Reference: AS568-015, 015 O-Ring, B70-015, NBR 70-015, Buna-N 70-015

Applications & Use Cases

The AS568-015 Buna-N 70 Duro O-Ring is commonly used in hydraulic fittings, pneumatic systems, pumps, valves, small motors, automotive repair, fuel systems, oil handling equipment, industrial maintenance, and general sealing repairs. It is a strong choice when the customer needs a standard-size O-Ring that seals petroleum-based fluids without overcomplicating the purchase.

Key Specifications

• Material: Buna-N Nitrile, NBR
• Durometer: 70 Shore A
• Color: Black
• Standard Size: AS568-015
• Inside Diameter: 0.551"
• Cross Section: 0.070"
• Certifications: Standard commercial grade, documentation available on request when applicable
• Temperature Range: -40° to +250°F (–40° to +121°C)
• Pressure Rating: Application dependent based on groove design, clearance gap, fluid, temperature, and use of back-up rings

Why Buy from The O-Ring Store LLC

The O-Ring Store LLC makes getting O-Rings easy by combining broad USA stock, fast shipping, and real sealing support from experienced people. Our ISO9001:2015 certified quality processes help keep orders accurate and traceable, while our team helps customers match the right material, size, and quantity for the application. In-stock items can ship same day, custom sizes are available, and full lot traceability or documentation can be provided on request. You get competitive pricing without giving up service, accuracy, or confidence in the seal you are buying.

FAQs

1. What is the B70015 O-Ring used for?
The B70015 is an AS568-015 Buna-N 70 Duro O-Ring used for general-purpose sealing in oil, fuel, hydraulic, pneumatic, pump, valve, and industrial applications.

2. Is Buna-N Nitrile good for hydraulic oil?
Yes. Buna-N Nitrile is a strong choice for many petroleum-based hydraulic fluids, oils, greases, and fuels. It is not recommended for phosphate ester hydraulic fluids.

3. What size is an AS568-015 O-Ring?
An AS568-015 O-Ring has an actual inside diameter of 0.551", an outside diameter of 0.691", and a cross section of 0.070". The metric size is 14.00mm ID X 17.56mm OD X 1.78mm CS.