30PCS Black NBR O-Ring Seals CS1.2mm OD5-20mm Nitrile Rubber

30-Pack Black NBR Nitrile Rubber O-Ring Seals — CS1.2mm | OD 5–20mm

Keep your machinery, plumbing, and hydraulic systems leak-free with these precision-grade NBR (Nitrile Butadiene Rubber) O-Ring Seals. Supplied in a convenient 30-piece lot, these standard ring gaskets deliver dependable sealing performance across a wide range of industrial and DIY applications. Made in Mainland China.

Key Features

• Oil-Resistant Material: NBR nitrile rubber is highly resistant to oils, fuels, and hydraulic fluids — ideal for preventing leaks in machinery and plumbing systems.
• Wide Temperature Range: Rated for continuous use from -40°C to +120°C (-40°F to 248°F), making these suitable for both cold-environment and high-temperature applications.
• Excellent Wear Resistance: Durable rubber compound maintains its shape and elasticity under repeated compression cycles.
• Standard Dimensions: Cross-section (CS) of 1.2mm, outer diameter (OD) ranging from 5mm to 20mm — a versatile sizing range to cover multiple ports and fittings.
• Wide Application Range: Suitable for hydraulic cylinders, pneumatic systems, water fittings, fuel lines, valves, pumps, and general mechanical assemblies.
• Value Pack: 30 pieces per lot at an excellent price point — stock up for maintenance jobs or keep spares on hand for repairs.

Specifications

Common Applications

• Hydraulic and pneumatic systems
• Plumbing connections and water fittings
• Fuel lines and oil systems
• Industrial machinery and pumps
• Valves, cylinders, and compressors
• Automotive and general mechanical repairs

Shopping Tip

Need multiple sizes? Add all required sizes to your cart before checkout — combined orders may qualify for discounted shipping.

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

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Frequently Asked Questions

Q: What does NBR stand for and why is it used for O-rings?

A: NBR stands for Nitrile Butadiene Rubber. It is widely used for O-ring seals because of its excellent resistance to oils, fuels, hydraulic fluids, and moderate temperatures. NBR O-rings provide reliable sealing in machinery, plumbing, and automotive applications where exposure to petroleum-based fluids is common.

Q: What sizes are included in the 30-piece lot?

A: Each lot contains 30 black NBR O-rings with a cross-section (CS) of 1.2mm and outer diameters (OD) ranging from 5mm to 20mm. The exact size mix per lot depends on the selected variant — check the product variant options for the specific OD size you need.

Q: Can these O-ring seals be used in high-temperature environments?

A: Yes. These NBR nitrile rubber O-ring gaskets are rated for an operating temperature range of -40°C to +120°C (-40°F to 248°F), making them suitable for a broad range of industrial, plumbing, and mechanical environments.

Q: Are these standard or non-standard O-rings?

A: These are standard-specification O-rings, making them compatible with most standard grooves and fittings used in machinery, hydraulic systems, and plumbing assemblies.

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.