O-ring Gasket in NBR, 3.5 mm Thickness | Sealing Tech

The Sealing Tech-G NBR (Nitrile Butadiene Rubber) O-ring with 3.5 mm thickness is a precision O-ring sealing solution for industrial applications requiring this intermediate measurement, common in European and Asian equipment. Available in 59 internal diameters from 8 mm to 140 mm, it covers both small diameter applications (instrumentation, compact valves) and medium to large diameter applications (pumps, cylinders, flanges). Highly compatible with oils, fuels, lubricants, water, and numerous non-polar solvents, it is the reference elastomer for environments with hydrocarbons. Its formulation ensures excellent abrasion and tear resistance, extending seal life and minimizing maintenance costs.

Applications

• Direct replacement for original seals in European and Asian equipment with 3.5 mm seal thickness
• Industrial instrumentation: precision seals in measurement and control equipment (ID 8–25 mm)
• Compact and needle valves: seat and stem seals in oily fluids
• Hydraulic and pneumatic systems: cylinders, actuators, and distributors
• Pumps and compressors: static and dynamic seals in contact with oils
• Automotive: engine, transmission, and fuel system seals
• General machinery: inspection gaskets, covers, and connections with oil or water
• Flanges and pressure vessels: closure seals in medium and large diameters (ID 60–140 mm)

Technical Specifications

• Material: NBR (Nitrile Butadiene Rubber)
• Seal thickness (CS): 3.5 mm
• Available internal diameters: 8 / 9 / 10 / 11 / 12 / 13 / 15 / 16 / 17 / 18 / 19 / 20 / 21 / 22 / 23 / 24 / 25 / 26 / 27 / 28 / 29 / 30 / 31 / 32 / 33 / 34 / 35 / 36 / 37 / 38 / 40 / 41 / 42 / 43 / 44 / 45 / 46 / 47 / 48 / 49 / 50 / 52 / 55 / 56 / 57 / 60 / 63 / 70 / 73 / 78 / 80 / 84 / 88 / 90 / 91 / 100 / 110 / 130 / 140 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 3.5 mm, nitrile o-ring 3.5mm thickness, NBR round gasket 3.5, nitrile o-ring seal 3.5mm CS, NBR O-ring 3.5mm, precision NBR o-ring, nitrile rubber O-ring 3.5mm, o-ring gasket replacement for European equipment Honduras, 3.5mm variable diameter o-ring.