O-ring Packing in NBR, Thickness 3 mm, Diameter 4 to 53 mm | Sealing Tech-G

The NBR (Nitrile Butadiene Rubber) O-ring with a 3 mm (0.118") thickness from Sealing Tech-G is the most comprehensive small-diameter O-ring in the catalog, with 61 internal diameters available from 4 mm to 53 mm. This 3 mm thickness corresponds to the AS568 Series -100 cross-section (American SAE standard) and is also a standard metric measurement in DIN 3771 and ISO 3601, making this product a dual-compatibility seal: it covers both American standard (AS568-100) and European standard (DIN/ISO) equipment. Internal diameters in whole millimeters (4–53 mm) correspond to the metric series, while internal diameters in decimals (11.5, 14.5, 18.2, 19.2, 20.2, 22.2, 29.2, 29.5, 30.2, 34.5, 35.2, 37.5, 39.5, 42.2, 44.2, 44.5, 49.5 mm) are exact inch conversions from the AS568-100 series. Highly compatible with oils, fuels, lubricants, water, and numerous non-polar solvents.

Applications by Diameter Range

• ID 4–10 mm: Precision instrumentation, miniature hydraulic connectors, needle and control valves, small-diameter pipe fittings, screw and plug seals
• ID 11–20 mm: Compact ball and butterfly valves, small hydraulic and pneumatic cylinders, industrial connectors and fittings, shaft seals in electric motors and compact pumps
• ID 21–35 mm: Small hydraulic and pneumatic pumps, compact actuators, process valves, cover and body seals in instrumentation equipment
• ID 37–53 mm: Medium-diameter industrial valves, compact hydraulic cylinders, flange seals in small-diameter piping, automotive and refrigeration equipment
• Direct replacement in equipment compliant with AS568 Series -100 (American SAE standard, CS 0.118")
• Replacement in machinery compliant with DIN 3771 or ISO 3601 with a 3 mm seal thickness
• Automotive: engine, transmission, fuel and cooling system seals in American and European vehicles
• Maintenance and repair of industrial equipment with 3 mm thick seals in the 4 to 53 mm internal diameter range

Technical Specifications

• Material: NBR (Nitrile Butadiene Rubber)
• Seal thickness (CS): 3 mm (0.118")
• Reference standards: AS568 Series -100 (SAE), DIN 3771, ISO 3601
• Available internal diameters: 4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 / 11.5 / 12 / 13 / 14 / 14.5 / 15 / 16 / 17 / 18 / 18.2 / 19 / 19.2 / 20 / 20.2 / 21 / 22 / 22.2 / 23 / 24 / 24.5 / 25 / 26 / 27 / 28 / 29 / 29.2 / 29.5 / 30 / 30.2 / 31 / 32 / 34.5 / 35.2 / 37 / 37.5 / 38 / 39 / 39.5 / 40 / 41 / 42 / 42.2 / 44 / 44.2 / 44.5 / 45 / 46 / 47 / 48 / 49 / 49.5 / 52 / 53 mm
• Temperature range: -30 °C to +100 °C (peaks up to +120 °C)
• Chemical resistance: Mineral oils, fuels, lubricants, water, non-polar solvents
• Configuration: O-ring
• Unit of sale: Unit
• Country of origin: Taiwan
• Brand: Sealing Tech-G

Chemical Compatibility

NBR is compatible with mineral oils, fuels, lubricants, water, and non-polar solvents. It is not compatible with concentrated acids, ketones, esters, ozone, or glycol-based brake fluids. For these applications, consider EPDM or VITON O-rings.

Other Common Names

This component is also known as: NBR o-ring 3 mm thickness, nitrile o-ring 3mm CS, NBR round gasket 3mm, AS568-100 nitrile o-ring, NBR O-ring 0.118 inch thickness, DIN 3771 NBR o-ring 3mm, small diameter nitrile o-ring Honduras, o-ring gasket 4mm to 53mm nitrile, o-ring 3mm thickness hydraulic instrumentation, miniature NBR o-ring 3mm.