NBR FKM VMQ Silicone O-Rings 3.5mm CS ID 8–155mm Rubber Seal

NBR / FKM / VMQ Rubber O-Rings — 3.5mm Cross-Section, ID 8–155mm

Keep your fluid and pneumatic systems sealed tight with these precision-engineered O-rings from Ouling. Available in three industry-standard materials — NBR (Nitrile), FKM (Fluorocarbon / Fluorine), and VMQ (Silicone) — these ring gaskets are designed to provide a reliable, leak-free seal across a wide range of applications, temperatures, and media.

Whether you are working on hydraulic equipment, plumbing systems, pumps, valves, or industrial machinery, this comprehensive size range (8mm to 155mm inner diameter at a 3.5mm cross-section thickness) ensures you will find the exact fit you need.

Made in Mainland China.

Key Features

• Multiple Material Options: Choose from NBR (black, excellent oil & fuel resistance), FKM/Fluorine (superior chemical & high-temperature resistance), or VMQ Silicone (red/white, wide temperature range, food-grade compatible)
• Standard Cross-Section (CS): 3.5mm thickness for precise groove fitment
• Wide Inner Diameter Range: ID 8mm through 155mm — versatile fit for countless applications
• Ring Gasket Shape: Uniform circular profile ensures consistent compression and sealing
• Available Colors: Black (NBR/FKM), Red & White (VMQ Silicone)
• Standard Spec: Manufactured to standard dimensions for drop-in replacement use

Material Comparison Guide

Specifications

• Brand: Ouling
• Cross-Section (CS): 3.5mm
• Inner Diameter (ID): 8mm – 155mm
• Shape: Ring Gasket
• Standard: Standard dimensions
• Material: NBR / FKM / VMQ Silicone Rubber
• Origin: Made in Mainland China

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Frequently Asked Questions

Q: What is the difference between NBR, FKM, and VMQ silicone O-rings?

A: NBR (Nitrile) O-rings offer excellent resistance to oils and fuels, making them ideal for hydraulic and automotive applications. FKM (Fluorocarbon/Fluorine) O-rings provide superior resistance to chemicals, solvents, and high temperatures up to 200°C. VMQ (Silicone) O-rings have the widest temperature range and are commonly used in food-grade, medical, and extreme-environment applications. Choose your material based on the fluid type and temperature range your application requires.

Q: What does CS 3.5mm and ID 8–155mm mean for O-rings?

A: CS (Cross-Section) refers to the thickness or diameter of the O-ring's circular profile — in this case, 3.5mm. ID (Inner Diameter) is the measurement of the inside opening of the ring, ranging from 8mm to 155mm in this product set. To find the correct size, measure the groove or port where the O-ring will sit and match both the inner diameter and cross-section to ensure a proper seal.

Q: Are these O-rings suitable for plumbing and hydraulic system repairs?

A: Yes. These standard-dimension rubber O-ring gaskets are widely used in plumbing, hydraulic systems, pumps, valves, compressors, and industrial machinery. Select NBR for oil-based systems, FKM for high-chemical or high-heat environments, and VMQ silicone for water, food-contact, or wide-temperature applications.

Q: Can I use VMQ silicone O-rings in food or beverage equipment?

A: VMQ silicone is a common choice for food and beverage applications due to its wide temperature tolerance and general compatibility with food-safe environments. Please verify the specific grade and any applicable certifications required for your use case 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.