50Pcs NBR O-Ring Seals CS1.9mm OD21–30mm Nitrile Rubber Gaskets

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

Keep your machinery and plumbing systems leak-free with this value-packed set of 50 Black NBR (Nitrile Butadiene Rubber) O-Ring Seals. With a cross-section of CS 1.9mm and outer diameters ranging from OD 21mm to OD 30mm, these standard-size ring gaskets are engineered for dependable sealing performance across a wide range of industrial, automotive, and household applications.

Made in Mainland China.

Key Features

• Wide Temperature Range: Rated for use from -40°C to 120°C (-40°F to 248°F), making them suitable for both cold and high-heat environments.
• Oil Resistant: NBR (nitrile rubber) compound provides excellent resistance to oils, fuels, and hydraulic fluids — ideal for preventing oil leakage in machinery and engines.
• Wear Resistant: Durable rubber compound withstands repeated compression and friction, maintaining a tight seal over extended use.
• Standard Ring Gasket Shape: Uniform ring profile ensures consistent sealing contact and easy installation in standard O-ring grooves.
• Versatile Applications: Suitable for hydraulic systems, plumbing fittings, automotive components, pumps, valves, and general machinery.
• Great Value: 50 pieces per lot — stock up and always have the right seal on hand.

Specifications

Shopping Tip

Need multiple sizes? Add all desired sizes to your cart first, then check out together — combined orders may qualify for discounted shipping rates.

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

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Frequently Asked Questions

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

A: These O-ring seals are made from NBR (Nitrile Butadiene Rubber), a synthetic rubber compound widely valued for its outstanding resistance to oils, fuels, and hydraulic fluids. NBR is one of the most commonly specified materials for sealing applications in machinery, automotive systems, and plumbing because it maintains its elasticity and sealing integrity across a broad temperature range (-40°C to 120°C).

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

A: Each lot contains 50 black NBR O-rings with a cross-section (CS) of 1.9mm and outer diameters (OD) ranging from 21mm to 30mm. Please check the specific listing variant you select for the exact OD size included, as different variants may cover different OD measurements within that range.

Q: What applications are these NBR O-ring gaskets suitable for?

A: These nitrile rubber O-ring gaskets are well-suited for a wide range of sealing applications including hydraulic systems, pneumatic equipment, plumbing fittings, automotive engines, pumps, valves, compressors, and general industrial machinery. Their oil resistance and wear durability make them a go-to choice for both professional and DIY mechanical work.

Q: Are these O-rings compatible with water-based and oil-based fluids?

A: Yes. NBR O-rings perform well with oil-based fluids, fuels, and many water-based fluids. However, they are not recommended for use with ketones, strong acids, or ozone-heavy environments. Always verify compatibility with the specific fluid or medium in your application before installation.

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.