20PCS NBR Nitrile O-Ring Seals CS4mm | Multi-Size Gasket Set

20-Piece NBR Nitrile Rubber O-Ring Seal Gasket Set – CS 4mm

Keep your plumbing, machinery, and HVAC systems leak-free with this versatile pack of 20 NBR (Nitrile Butadiene Rubber) O-rings. With a consistent cross-section of 4mm and a wide range of outer diameters from 22mm to 50mm, this set covers the most commonly needed sizes for both home repairs and industrial applications.

Key Features

• Material: High-quality NBR (Nitrile Butadiene Rubber) – black color
• Cross-Section (CS): 4mm
• Outer Diameters Available: 22 / 24 / 25 / 28 / 30 / 32 / 34 / 35 / 38 / 40 / 42 / 45 / 48 / 50mm
• Inner Diameters: 14 / 16 / 17 / 20 / 22 / 24 / 26 / 27 / 30 / 32 / 34 / 37 / 40 / 42mm
• Shape: Standard ring gasket
• Quantity: 20 pieces per lot

Performance Properties

• ✅ Oil Resistant – Maintains integrity when exposed to petroleum-based fluids and lubricants
• ✅ Wear Resistant – Durable construction for long-lasting sealing performance
• ✅ Waterproof – Creates a reliable barrier against water and moisture ingress
• ✅ Temperature Resistant – Stable performance across a wide temperature range, ideal for air conditioning and hydraulic systems

Where to Use

These standard NBR O-rings are suitable for a broad range of sealing applications:

• Plumbing fixtures and pipe fittings
• Air conditioning and HVAC systems
• Hydraulic and pneumatic equipment
• Industrial machinery and factory equipment
• Automotive fluid systems
• Home appliances and DIY repairs

Why Choose NBR O-Rings?

NBR rubber is the industry-standard material for sealing rings thanks to its excellent resistance to oils, fuels, and hydraulic fluids. Its flexibility ensures a tight, reliable seal even under compression, preventing costly leaks in both residential and commercial environments.

Made in Mainland China.

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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 outstanding resistance to oils, fuels, hydraulic fluids, and water. NBR is the preferred choice for sealing applications in plumbing, automotive, and industrial machinery where exposure to these substances is common.

Q: What sizes are included in this 20-piece NBR O-ring set?

A: All rings in this set share a 4mm cross-section (CS). The outer diameters range from 22mm to 50mm, covering sizes: 22, 24, 25, 28, 30, 32, 34, 35, 38, 40, 42, 45, 48, and 50mm. Inner diameters range from 14mm to 42mm accordingly.

Q: Are these O-rings suitable for air conditioning and HVAC use?

A: Yes. These NBR rubber O-rings are specifically designed to withstand the temperature variations and fluid types commonly found in air conditioning and HVAC systems, making them an excellent replacement or repair solution for such applications.

Q: How many O-rings come in one order?

A: Each order includes 20 O-rings per lot. The rings are packaged securely to prevent deformation during shipping.

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.