50PCS Black NBR O-Ring Seals CS1.8mm Nitrile Rubber Gasket Washer

50-Pack Black NBR O-Ring Seals — Reliable Nitrile Rubber Gaskets for Machinery & Plumbing

Keep your systems leak-free with this value pack of 50 black NBR (Nitrile Butadiene Rubber) O-ring seals. With a cross-section of 1.8mm and inner diameters ranging from 4.5mm to 6.9mm, these standard-size ring gaskets are engineered for dependable sealing performance across a wide range of industrial, mechanical, and plumbing applications. Made in Mainland China.

Key Features

• Oil Resistant: NBR nitrile rubber compound effectively resists petroleum-based oils and fuels, making these O-rings ideal for hydraulic and lubrication systems.
• Wide Temperature Range: Operates reliably from -40°C to 120°C (-40°F to 248°F), handling both cold and high-heat environments with ease.
• Excellent Wear Resistance: Durable rubber construction maintains its shape and sealing integrity even under repeated use and compression.
• Standard Sizing: CS 1.8mm cross-section with inner diameters from 4.5mm to 6.9mm — compatible with many standard fittings, valves, and connectors.
• Versatile Applications: Suitable for machinery, plumbing, hydraulics, pneumatics, automotive systems, and general-purpose sealing tasks.
• Great Value: 50 pieces per lot means you always have a spare on hand for quick repairs and maintenance.

Specifications

Shopping Tip

Need multiple sizes? Add all required O-ring sizes to your cart first, then check out in a single order — combined shipping discounts apply automatically at checkout.

Note: Due to differences in monitor display settings and lighting, the actual product color may vary slightly from images shown.

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Frequently Asked Questions

Q: What material are these O-rings made from, and why does it matter?

A: These O-rings are made from NBR (Nitrile Butadiene Rubber), a synthetic rubber known for its excellent resistance to petroleum-based oils, fuels, and hydraulic fluids. NBR is the go-to material for sealing applications in machinery and plumbing where oil or fuel contact is expected.

Q: What sizes are included in the 50-piece lot?

A: Each lot contains 50 black NBR O-rings with a cross-section (CS) of 1.8mm and inner diameters (ID) ranging from 4.5mm to 6.9mm. Please check your specific size requirement before ordering, as the lot covers this ID range.

Q: What applications are these nitrile rubber O-ring seals suitable for?

A: These standard NBR O-ring gaskets are suitable for a wide variety of applications including hydraulic systems, pneumatic fittings, plumbing connections, automotive components, industrial machinery, and general-purpose mechanical sealing tasks.

Q: Can I save on shipping if I order multiple sizes?

A: Yes! If you need multiple O-ring sizes, we recommend adding all desired products to your cart and placing a single combined order. Shipping discounts are applied automatically when ordering together through the cart.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.