3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea
3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea

3.5mm Cross Section O-Rings NBR Nitrile Rubber 12mm - 170mm OD Oil Resistant Sea

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🔍 About Our Premium 3.5mm NBR O-Rings

Upgrade your repairs with our professional-grade NBR O-Rings! This versatile set of oil and fuel-resistant seals is the ideal solution for automotive, industrial, and household sealing challenges. Manufactured from high-quality Nitrile Rubber (NBR/Buna-N), these nitrile rubber seals offer outstanding durability, excellent elasticity, and a reliable, long-lasting seal against oils, fuels, water, and many common fluids.

🌟 Key Benefit: With a broad operating temperature range from -40°F to +248°F (-40°C to +120°C), these 3.5mm cross-section O-rings deliver consistent performance in both cold and high-heat environments, making them incredibly versatile.

📋 Technical Specifications for 3.5mm O-Rings

Specification Detail
Material Nitrile Rubber (NBR, Buna-N)
Cross Section 3.5mm
Outer Diameter (OD) Range 12mm to 370mm (Wide selection of sizes)
Hardness (Durometer) Shore 70A (Ideal balance of flexibility and sealing force)
Temperature Range -40°F / -40°C to +248°F / +120°C
Primary Features Excellent Oil & Fuel Resistance, Water Resistant, Abrasion Resistant, Good Compression Set, Reliable Sealing Properties

🛠️ Common Uses for 3.5mm NBR Seals

These oil-resistant O-rings are the go-to solution for countless leak-proof applications:

  • 🚗 Automotive & Small Engine Repair: Perfect for sealing fuel lines, oil filters, coolant systems, and power steering components.
  • 🏭 Hydraulic & Pneumatic Equipment: Effective seals for hydraulic fluid, lubricants, and compressed air systems.
  • 🚿 Plumbing & Appliance Repair: Great for faucets, valves, water filters, pressure washers, and dishwasher connections.
  • 🔧 General Machinery & DIY Projects: The essential seal for equipment maintenance, tool repair, and custom fabrication projects.
  • 💨 Air & Fluid Power Tools: Reliable sealing for air compressors, paint sprayers, and fluid transfer pumps.

❓ Frequently Asked Questions About NBR O-Rings

Are these NBR O-rings suitable for gasoline or diesel fuel? ⛽

Absolutely. Nitrile Rubber (NBR) is renowned for its excellent resistance to petroleum-based fuels and oils. These seals are an excellent choice for automotive fuel system sealing, handling gasoline, diesel, motor oil, and most hydraulic fluids with ease.

How do I select the correct size O-ring? 📏

Identify two measurements: the Cross Section (cord thickness) and the Inner Diameter (ID) or Outer Diameter (OD). Measure the groove where the seal will sit. This product has a fixed 3.5mm cross-section, so you simply match the required OD from our available range (12mm-370mm). When in doubt, measure your old seal or the groove dimensions.

What's the difference between NBR, silicone, and EPDM rubber seals?

NBR (Nitrile) is the champion for oil and fuel resistance, making it ideal for engines and machinery. Silicone has a wider temperature range (especially high heat) and is used in food-grade applications, but swells in oil. EPDM excels with weather, steam, and coolant, but performs poorly with fuels. For oil-based fluids, NBR O-rings are the standard choice.

Can I use these for outdoor or underwater applications? 🌧️

Yes, for most cases. NBR has good resistance to water and weathering. However, for permanent outdoor exposure to sunlight/ozone or constant immersion, materials like EPDM or Viton® may offer longer life. For intermittent water contact (plumbing, pumps, washers), these NBR seals perform very well.

Do you offer bulk pricing or specific size kits? 🧰

We focus on providing high-quality standard-sized 3.5mm O-ring kits. Bulk discounts are available for large quantity orders. Please contact our customer service for specific pricing and to discuss any custom requirements.