O-Rings & Oil Seals: NBR, Viton Metric, Imperial and BS Series Seals

A single failed O-ring or oil seal can take a machine down, contaminate a product, or create a safety hazard. AIMS Industrial supplies an extensive range of O-rings and oil seals in NBR 70 (nitrile) and Viton 75 (fluoroelastomer) compounds, across metric and imperial sizes, British Standard (BS) series, and O-ring cord by the metre — plus metric and Viton oil seals for rotating shaft sealing applications.

The AIMS O-Ring & Oil Seal Range

Our seal range covers the most common industrial sealing requirements across hydraulic, pneumatic, fluid handling, and rotating machinery applications.

• NBR 70 O-Rings (Metric): NBR (nitrile butadiene rubber) 70 Shore A hardness O-rings in metric sizes across 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 4mm, and 5mm cross-sections and a comprehensive ID range. NBR is the standard O-ring compound for mineral oils, hydraulic fluids, fuels, water, and air service across -40°C to +120°C.
• NBR 70 O-Rings (Imperial): Imperial NBR O-rings for non-metric equipment and AS/BS pipe fitting applications. Metric and imperial sizes can look very similar — always confirm the cross-section and ID measurement in millimetres before ordering.
• NBR O-Rings (BS Series): British Standard (BS 1806) O-rings in the BS1–BS932 numbering system for equipment specified to BS dimensions. Common in older UK and Australian industrial machinery, compressors, and hydraulic systems.
• Viton 75 O-Rings (Metric & Imperial): Viton (FKM) 75 Shore A O-rings provide superior chemical resistance to fuels, solvents, hydraulic fluids, and high temperatures up to +200°C — required where NBR would swell, crack, or degrade in service.
• Oil Seals: Metric and Viton lip-type oil seals for rotating shaft sealing in gearboxes, pumps, motors, and axles. Critical for preventing oil egress and contaminant ingress in rotating machinery. Viton seals suit high-temperature and chemical-exposure applications where standard NBR seals fail prematurely.
• O-Ring Cord: O-ring cord by the metre in NBR compound allows custom-size O-rings to be made on-site by cutting to length and joining with O-ring splicing compound — useful for large-bore or non-standard sizes not available as moulded rings.

Seal Material Selection

• NBR vs Viton: NBR suits the majority of industrial sealing applications (petroleum oils, hydraulic fluid, water, air) at standard temperatures. Viton is required for aggressive chemicals, fuel additives, high temperatures above 120°C, and applications where NBR shows swelling or hardening in service.
• Critical: Measure Before Ordering: O-ring sizes are specified by inside diameter (ID) and cross-section (CS) diameter. Both dimensions must be measured on the original seal — relying on housing dimensions alone can introduce incorrect compression values.
• Expert Support: Can’t identify your seal size or compound? Contact our team or request a quote — send us the dimensions and we’ll identify the correct seal.
• Australian Business, Local Supply: As a proudly Australian business since 1988, we stock locally and work with trusted local Australian manufacturers and distributors to ensure fast, reliable supply.

Also see our hydraulics and pneumatics ranges for cylinders and fittings that require these sealing components.