O-Rings by Material
NBR O-Rings (Nitrile / Buna-N)
The industry-standard O-ring compound — NBR (Nitrile, Buna-N) offers excellent resistance to petroleum-based oils and fuels at an economical price point, making it the default choice for the majority of industrial sealing applications.
Properties
Key Properties
| Property | Value |
|---|---|
| Temperature Range | −30 °C to +120 °C |
| Hardness Range | 40 to 90 Shore A (70 Shore A standard) |
| Resists | Petroleum oils, fuels, hydraulic fluids (mineral-based), greases, water, silicone greases |
| Avoid | Ozone, UV, ketones, esters, strong acids, brake fluid (glycol-based), automotive fuels with high aromatic content |
| Typical Applications | Hydraulic systems, pneumatic fittings, engine components, fuel systems, industrial machinery, water handling equipment |
| Available Standards | AS568, ISO 3601, BS 1806, JIS B2401, DIN 3771 |
For a complete material data sheet, see the full NBR O-Rings material page.
Sizes
Available Sizes
FITCO manufactures NBR O-Rings in all standard AS568 and metric sizes — from AS568-001 (0.74 mm ID) through AS568-475 (633.48 mm ID), plus metric sizes per ISO 3601, JIS B2401, and BS 1806.
- Standard durometers in stock
- Custom compounds and special durometers on request
- Cord stock available for field-cut rings
- Typical lead time: ex-stock for standard sizes, 2–4 weeks for custom
Resources
Related Pages
Full Material Data
Complete technical data sheet with chemical compatibility, compression set, and physical properties.
O-Ring Size Charts
AS568, Metric, JIS, BS, GB/T size tables with ID, OD, and cross-section dimensions.
Chemical Compatibility
Check material compatibility with your specific fluid or chemical environment.