O-ring Type Packing in NBR, 4 mm Thickness | Sealing Tech

The NBR O-ring (Nitrile Butadiene Rubber) with 4 mm thickness from Sealing Tech-G is one of the most widely used metric O-rings in global industry, compatible with DIN 3771, ISO 3601, JIS B 2401 standards and general machinery of European, Asian, and Latin American origin. With 90 available internal diameters from 7 mm to 200 mm, this product covers the widest range of our line: from compact instrumentation seals and needle valves (ID 7–25 mm) to large flanges, pressure vessels, and industrial cylinders (ID 130–200 mm). Highly compatible with oils, fuels, lubricants, water, and numerous non-polar solvents, it is the reference elastomer for environments with hydrocarbon presence. Its formulation guarantees excellent abrasion and tear resistance, extending the seal's lifespan and minimizing maintenance costs.

Applications by Diameter Range

• ID 7–25 mm: Industrial instrumentation, needle and control valves, hydraulic connectors, precision seals in compact equipment
• ID 27–60 mm: Hydraulic and pneumatic cylinders, compact pumps, ball and butterfly valves, industrial actuators
• ID 62–110 mm: Centrifugal and positive displacement pumps, compressors, cover and body seals, pipe flanges
• ID 114–200 mm: Large industrial flanges, pressure vessels, heat exchangers, inspection covers, closure seals in process equipment
• Direct replacement in machinery compliant with DIN, ISO 3601 or JIS B 2401 standards with 4 mm seal thickness
• Hydraulic and pneumatic systems: cylinders, distributors, and actuators of metric standard
• Automotive: engine, transmission, and fuel system seals in vehicles of European and Asian origin
• Maintenance and repair of imported industrial equipment with metric dimensions

Technical Specifications

• Material: NBR (Nitrile Butadiene Rubber, Nitrile Rubber)
• Seal thickness (CS): 4 mm
• Reference standards: DIN 3771, ISO 3601, JIS B 2401
• Available internal diameters: 7 / 8 / 9 / 10 / 12 / 13 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 22 / 23 / 24 / 25 / 27 / 28 / 30 / 31 / 32 / 33 / 35 / 36 / 37 / 38 / 40 / 41 / 42 / 44 / 45 / 47 / 48 / 50 / 51 / 52 / 53 / 54 / 55 / 56 / 57 / 60 / 62 / 63 / 64 / 65 / 66 / 67 / 68 / 70 / 71 / 72 / 74 / 75 / 76 / 77 / 78 / 80 / 82 / 84 / 85 / 86 / 90 / 92 / 95 / 96 / 97 / 98 / 102 / 104 / 105 / 110 / 114 / 117 / 118 / 120 / 125 / 130 / 132 / 135 / 142 / 150 / 155 / 160 / 170 / 180 / 182 / 190 / 200 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
• Sales unit: 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 mm thickness, nitrile o-ring 4mm CS, NBR round gasket 4mm, DIN 3771 NBR O-ring 4mm, NBR O-ring ISO 3601 4mm, metric NBR O-ring 4mm, nitrile rubber O-ring 4mm, industrial o-ring Honduras 4mm, o-ring 4mm variable diameter nitrile, hydraulic oil O-ring 4mm.