O-ring packing in NBR, 4.5 mm Thickness | Sealing Tech-G

The Sealing Tech-G NBR (Nitrile Butadiene Rubber) O-ring with a 4.5 mm thickness is a precision O-ring for direct replacement applications in equipment that uses this intermediate size, common in machinery of European origin (especially German and Italian) and in some automotive applications. Available in 4 internal diameters: 38, 42, 49, and 50 mm, it covers the medium diameter range ideal for compact valves, pumps, and cylinders. The 4.5 mm thickness appears in equipment where the designer opted for a larger cross-section than 4 mm to increase compression and extend the seal's lifespan in higher pressure or temperature applications. Highly compatible with oils, fuels, lubricants, water, and numerous non-polar solvents, it guarantees reliable sealing in demanding industrial environments.

Applications

• Direct replacement for original seals in equipment with 4.5 mm thick seals (European origin)
• Industrial ball, butterfly, and gate valves: seat and stem seals in medium diameters
• Compact hydraulic and pneumatic pumps: cover, body, and shaft seals
• Hydraulic and pneumatic cylinders: high-compression static seals
• European automotive: engine, transmission, and fuel system seals with this specific size
• German and Italian industrial machinery: process equipment, presses, and fluid systems
• Instrumentation and control: precision seals in measuring equipment with this cross-section
• Maintenance and repair of imported European equipment with 4.5 mm thick seals

Technical Specifications

• Material: NBR (Nitrile Butadiene Rubber)
• Seal Thickness (CS): 4.5 mm
• Available Internal Diameters: 38 / 42 / 49 / 50 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 4.5 mm thickness, nitrile o-ring 4.5mm CS, NBR 4.5mm round gasket, European NBR o-ring 4.5mm, NBR O-ring 4.5mm cross section, German NBR o-ring 4.5mm, nitrile rubber O-ring 4.5mm, o-ring gasket replacement European equipment Honduras, o-ring 4.5mm diameter 38 42 49 50 mm.