7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals
7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals

7mm Cross Section O-Rings NBR Nitrile Rubber 30mm - 407mm OD Oil Resistant Seals

$2.76 USD
In stock
Outer x Inner x Cross section:

Outer x Inner x Cross section
Quantity:

Quantity
Quantity:
COUPON Code：Welcome

Only once, Get 10% off now

Amazon American Express Apple Pay Bancontact Diners Club Discover Google Pay iDEAL Mastercard PayPal Shop Pay USDC Visa

  • Delivery

    Express shipping (1-7 Days)
    Standard shipping: (3-14 Days)

  • Free Return & Exchange

    30-Day Money Back
    Free Exchange & No-Hassle Returns

  • Shipping from US facilities

  • Your purchase makes a difference.
    Your impact: 1 tree will be planted with this purchase.

🔍 Standard Size 7mm NBR O-Rings - Your Go-To Oil-Resistant Seals

Discover the perfect heavy-duty sealing solution for the most common applications! Our 7mm Cross Section NBR O-Rings cover the essential size range from 30mm to 407mm OD, making them ideal for automotive, industrial, and plumbing repairs. Made from premium Nitrile Rubber (Buna-N), these robust seals deliver reliable performance against oils, fuels, and hydraulic fluids.

🌟 Most Popular Sizes Included: This 7mm O-ring collection covers the most frequently needed sizes for automotive engines, hydraulic cylinders, pumps, and industrial equipment. Get the thickness you need for high-pressure applications without paying for custom sizes!

📋 Technical Specifications for 7mm Standard NBR O-Rings

Material Nitrile Rubber (NBR / Buna-N) – Industry standard for oil and fuel resistance, offering excellent durability in harsh environments.
Cross Section (Thickness) 7mm (0.276") – Heavy-duty profile ideal for high-pressure applications and systems with larger clearances.
Outer Diameter (OD) Range 30mm (1.18") to 407mm (16.0") – Comprehensive coverage of standard industrial and automotive sizes.
Hardness (Durometer) Shore 70A – Optimal balance between sealing force and flexibility for most applications.
Temperature Range -40°F to +248°F (-40°C to +120°C) – Performs reliably in both cold and high-heat conditions.
Key Features & Applications Excellent resistance to petroleum oils, fuels, water, and hydraulic fluids. Superior abrasion resistance. Perfect for hydraulic seals, automotive repairs, pumps, and general industrial sealing.

🛠️ Common Applications for Standard 7mm NBR O-Rings

These 7mm thick O-rings are versatile seals suitable for numerous industries and projects:

  • 🚗 Automotive & Small Engine Repair: Engine gaskets, power steering systems, transmission seals, fuel system components, and hydraulic brake cylinders.
  • ⚙️ Industrial Hydraulics & Pneumatics: Hydraulic cylinders (small to medium), pneumatic pistons, valve stems, pump housings, and compressor seals.
  • 🔧 Plumbing & Fluid Systems: Water filtration systems, pump seals, pipe flange gaskets, and irrigation equipment seals.
  • 🏭 Manufacturing & Machine Maintenance: Production equipment, press fittings, conveyor system components, and general machinery repair.
  • 🛠️ DIY & Home Workshop: Perfect for hobbyists and professionals working on equipment restoration, custom builds, or general maintenance tasks.

❓ Frequently Asked Questions About Standard 7mm NBR Seals

Why choose 7mm thickness over thinner O-rings for automotive use? 🚗

7mm automotive O-rings provide superior durability in high-pressure systems like power steering and hydraulic brakes. They resist extrusion better than thinner seals, last longer in dynamic applications, and can compensate for minor wear in older equipment—making them ideal for both repair and preventative maintenance.

How do I measure for the right 7mm O-ring size? 📏

You need cross cross-section (7mm) and either the Inner Diameter (ID) or the Outer Diameter (OD). For replacement: measure the old O-ring's ID or OD. For grooves: measure the groove's ID for the O-ring's OD, or the groove's OD for the O-ring's ID. Our 30-407mm OD range covers the most common metric and inch-equivalent sizes.

Are these NBR seals compatible with brake fluid and transmission fluid? ⚠️

Yes, for standard fluids. NBR has excellent compatibility with petroleum-based fluids like automatic transmission fluid (ATF) and mineral-based brake fluids. For DOT 3, DOT 4, and DOT 5.1 brake fluids, NBR is commonly used. Always verify compatibility with specific fluid manufacturers for critical applications.

What's the advantage of a 7mm cross-section in hydraulic applications? 💧

In hydraulic systems, the 7mm thickness provides greater resistance to extrusion through gaps between mating parts, especially under high pressure. This reduces failure rates, extends seal life, and provides more reliable sealing in systems with pressure spikes or larger clearances due to manufacturing tolerances.

Do you offer mixed kits or individual sizes? 📦

We offer both options! You can purchase individual 7mm O-ring sizes for specific repair jobs, or explore our value-packed mixed kits that include multiple popular sizes. This makes our standard size O-ring collection perfect for maintenance shops, fleet services, and serious DIYers who need a range of sizes on hand.