Is the Metric O-Ring Assortment, NBR Rubber suitable for sealing automotive fuel and oil systems?

Metric O-Ring Assortment, NBR Rubber Format — Yes, generally suitable for sealing automotive fuel and oil systems with some caveats. NBR (nitrile rubber) with 70 Shore hardness is widely used for fuel- and oil-resistant seals and offers good compatibility with petroleum-based fuels, engine oils, hydraulic fluids and many common lubricants. For typical automotive repair and maintenance tasks this assortment will provide durable, oil- and fuel-resistant O-rings and a wide range of metric sizes for matching connections. However, suitability depends on specific conditions: - Fuel type: NBR performs well with gasoline and diesel but has limited resistance to some modern fuels with high ethanol or methanol content, and certain aggressive additives. For E85 or high-alcohol blends consider FKM/Viton or EPDM alternatives. - Temperature and pressure: NBR is suitable for normal engine operating temperatures and moderate pressures. For sustained high temperatures (>120–150 °C) or very high-pressure applications, use a material rated for those conditions. - Chemical exposure: Avoid NBR if exposed to strong acids, ketones, or silicone-based fluids. Recommendation: Verify the exact fluid composition, operating temperature and pressure of the application and check that the specific O-ring sizes in the assortment match your fittings (see product photo for size breakdown). For standard automotive fuel/oil sealing jobs, these NBR O-rings are an appropriate and cost-effective choice; for specialty fuels, extreme temperatures or critical high-pressure systems, choose a material specifically rated for those conditions.

Can the Metric O-Ring Assortment, NBR Rubber withstand temperatures typically encountered in automotive and industrial applications without losing sealing performance?

Yes — the Metric O-Ring Assortment, NBR Rubber can withstand temperatures typically encountered in most automotive and general industrial applications without losing sealing performance, with some caveats. Why: NBR (nitrile rubber) with a hardness of 70 Shore is specifically valued for excellent resistance to oils, fuels and many common fluids, and it maintains reliable sealing across the common operating temperature range for these environments. Typical effective temperature range for standard NBR is approximately -30°C to +100°C (‑22°F to +212°F). Within that range the material retains elasticity and sealing integrity for routine automotive systems (fuel lines, oil fittings, hydraulic controls at moderate temperatures) and many industrial uses. Caveats: - Extended exposure near the upper limit (around +100°C) or frequent thermal cycling can accelerate aging, hardening and loss of elasticity, reducing long-term performance. - NBR is not suitable for continuous use at very high temperatures (>120°C), or for certain aggressive chemicals, steam, or hot, ozone-rich environments — for those conditions alternative elastomers (e.g., FKM/Viton, EPDM, silicone) should be considered. - Ensure correct size, compression and application conditions; proper selection and installation are key to maintaining leak-free performance. In summary: For typical automotive and many industrial applications operating within -30°C to +100°C, the Metric O-Ring Assortment, NBR Rubber will provide dependable sealing performance, but for higher temperatures or very aggressive media select a more appropriate material.

Set O-rings metric, NBR

All products, General purpose seals/

Additional information

Maximum operating temperature [°C]	100
Minimum operating temperature [°C]	-30

Set seals type O-ring, metric, for general use. Material NBR, hardness 70 acc. to Shore’a. Detailed information about the quantity and sizes can be found in the photo.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Price	Quantity	Actions	Catalogue
TI-UOM-KIT	Set O-rings metric	-	-	In stock	0 €		Enquiry

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Set seals type O-ring, metric, for general use. Material NBR, hardness 70 acc. to Shore’a. Detailed information about the quantity and sizes can be found in the photo.