O-ring Seal in NBR, 5.7 mm Thickness | Sealing Tech-G

The Sealing Tech-G NBR (Nitrile Butadiene Rubber) O-ring with a thickness of 5.7 mm (0.224") is a precision O-ring manufactured under the AS568 dimensional standard (American SAE standard), where the 5.7 mm thickness corresponds to the cross-section of the AS568-300 series, the largest diameter series of the standard AS568. Its 21 available internal diameters — from 49.2 mm to 189.3 mm — are exact conversions of inch measurements from the AS568-300 series, ensuring direct compatibility with equipment and components designed under American standards for large diameter applications. The larger 5.7 mm cross-section provides greater compression, better extrusion resistance, and longer service life in high-pressure applications with large diameters. Highly compatible with oils, fuels, lubricants, water, and numerous non-polar solvents.

Applications

• Direct replacement for O-rings in equipment designed under AS568-300 standard (large diameter series)
• High-pressure hydraulic systems with American standard components: large diameter cylinders, valves, and actuators
• Oil and gas industry: seals in gate valves, flanges, and high-pressure connections with SAE dimensions
• American heavy machinery: construction, mining, and agricultural equipment with AS568-300 seals
• Large diameter centrifugal and positive displacement pumps: cover, flange, and body seals with SAE standard
• High-pressure industrial compressors: valve and body seals in American-made equipment
• Pressure vessels and industrial reactors: cover and inspection seals with AS568 dimensions
• Maintenance and repair of equipment imported from the USA and Canada with AS568-300 series seals

Technical Specifications

• Material: NBR (Nitrile Butadiene Rubber)
• Seal thickness (CS): 5.7 mm (0.224")
• Dimensional standard: AS568 Series -300 / SAE (American standard)
• Available internal diameters: 49.2 / 51.2 / 52.2 / 54.3 / 55.3 / 59.2 / 59.7 / 60 / 64.2 / 67.2 / 69.2 / 70 / 74.2 / 79.2 / 84.2 / 89.6 / 99.6 / 104.2 / 164.3 / 180 / 189.3 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 5.7 mm thickness, AS568-300 nitrile O-ring, SAE series 300 nitrile packing, AS568 0.224 inch O-ring seal, NBR O-ring AS568 series 300, American standard large diameter NBR O-ring, nitrile rubber O-ring AS568-300, American standard large diameter O-ring packing Honduras, 0.224 inch thickness nitrile O-ring.