NBR (Nitrile Rubber) O‑Ring Seals (CS 2.5 mm, OD 9–250 mm, Oil‑Resistant)

Introduction

Specifications

• Product Name: NBR Nitrile Rubber O‑Ring Seal
• Material: Nitrile rubber (acrylonitrile‑butadiene copolymer)
• Cross‑Section (CS / Wire Diameter): 2.5 mm (other sizes available upon request)
• Outer Diameter (OD) Range: 9 mm – 250 mm
• Standards Compliant:
  • GB1235‑76 (marked as OD × wire diameter)
  • GB3452.1‑2005 (marked as ID × wire diameter)
• Inner Diameter Calculation: ID = OD − 2 × wire diameter
• Temperature Range: Up to 120 °C (continuous use)

Features

1. Excellent Oil & Fluid Resistance: Resistant to petroleum‑based oils, fuels, mineral oils, hydraulic fluids, water, and common non‑polar solvents.
2. Good Mechanical Properties: High tensile strength, wear resistance, and pressure‑change performance, with a low coefficient of dynamic friction.
3. Simple, Reliable Design: Easy to install, low‑cost, and provides dependable sealing under static, reciprocating, or rotating motion.
4. Versatile Sizing: Wide range of outer diameters (9 mm to 250 mm) with 2.5 mm cross‑section to fit many standard seal applications.
5. Commonly Used Material: NBR offers a balanced combination of performance and affordability for most general‑purpose sealing needs.

Applications

• Automotive Systems: Seals in engines, transmissions, fuel systems, and lubrication circuits (fuel tanks, oil tanks, hydraulic components).
• Hydraulic & Pneumatic Equipment: Seals for hydraulic presses, machine tools, and fluid power systems using mineral oils, glycol fluids, and diester lubricants.
• Industrial Machinery: Mining, metallurgy, engineering machinery, and tractors, where resistance to oils, water, and moderate pressure is required.
• General Fluid Sealing: Used with engine oil, gasoline, vegetable oils, silicone greases, water, and low‑concentration acids/alkalis at normal temperatures.

Notes

• Limitations: Not suitable for use with polar solvents (e.g., ketones, MEK, chloroform), ozone, or environments requiring resistance to weathering or heat‑air aging.
• Other cross‑section sizes (1 mm, 1.5 mm, 1.9 mm, 2 mm, 2.4 mm, 3 mm, 3.1 mm, 3.5 mm, 4 mm, 5 mm, 5.7 mm, 6 mm, 8.6 mm, 10 mm, 1.8 mm, 2.65 mm, 3.55 mm, 5.3 mm, 7 mm ……) are available upon request – please contact customer service for more size options.