NBR FKM VMQ O-Rings 4mm CS OD 14–200mm Rubber Seals Gaskets
NBR FKM VMQ O-Rings 4mm CS OD 14–200mm Rubber Seals Gaskets
Details
NBR, FKM & VMQ O-Rings — 4mm Cross-Section, OD 14–200mm
Keep your hydraulic systems, plumbing connections, and mechanical assemblies leak-free with these precision-engineered O-rings from Ouling. Available in three high-performance rubber compounds — Nitrile (NBR), Fluorocarbon (FKM), and Silicone (VMQ) — these standard ring gaskets deliver reliable sealing across a wide range of industrial, automotive, and DIY applications. With a consistent 4mm cross-section (CS) and outer diameters ranging from 14mm to 200mm, you'll find the exact size you need for virtually any fitting or housing.
Made in Mainland China.
Material Guide — Choose the Right Compound
- NBR (Nitrile Rubber) — Black: Excellent resistance to oils, fuels, and hydraulic fluids. The go-to choice for automotive and industrial sealing applications.
- FKM (Fluorocarbon / Fluorine) — Black: Outstanding resistance to high temperatures, aggressive chemicals, and fuels. Ideal for demanding industrial environments.
- VMQ (Silicone) — Red/White: Superior flexibility across extreme temperature ranges, food-safe options, and excellent resistance to UV and ozone. Great for plumbing, food-processing equipment, and general-purpose sealing.
Key Features
- 4mm Cross-Section (CS): Uniform thickness ensures consistent compression and a reliable seal in standard grooves.
- Wide OD Range (14mm–200mm): Covers a broad spectrum of fitting sizes for versatile use.
- Multiple Material Options: NBR, FKM, and VMQ to match your specific temperature and chemical compatibility requirements.
- Standard Ring Gasket Shape: Drop-in compatible with standard O-ring grooves — no modification needed.
- Available in Multiple Colors: Black (NBR/FKM), Red and White (VMQ) for easy material identification at a glance.
- Durable Rubber Construction: Engineered for long service life under compression, pressure, and exposure to fluids.
Specifications
| Brand | Ouling |
| Cross-Section (CS) | 4mm |
| Outer Diameter (OD) | 14mm – 200mm |
| Materials | NBR, FKM (Fluorocarbon), VMQ (Silicone) |
| Colors | Black (NBR/FKM), Red / White (VMQ) |
| Shape | Ring Gasket |
| Standard | Standard |
| Origin | Mainland China |
Common Applications
- Hydraulic and pneumatic systems
- Automotive engine and fuel system sealing
- Plumbing and pipe fittings
- Industrial machinery and pumps
- Food and beverage equipment (VMQ/Silicone grade)
- DIY repairs and home appliance maintenance
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Frequently Asked Questions
Q: What is the difference between NBR, FKM, and VMQ O-rings?
A: NBR (Nitrile) is best for oil and fuel resistance at moderate temperatures. FKM (Fluorocarbon) handles higher temperatures and aggressive chemicals. VMQ (Silicone) excels in extreme temperature ranges and is often used in food-grade or outdoor applications. Choose based on the fluid type and operating temperature of your application.
Q: What does "CS 4mm OD 14–200mm" mean?
A: CS (Cross-Section) is the thickness/diameter of the O-ring's circular profile — here it is 4mm. OD (Outer Diameter) is the total outside diameter of the ring, ranging from 14mm to 200mm in this product line. Both measurements are critical for selecting the right O-ring for your groove dimensions.
Q: Are these O-rings compatible with standard grooves?
A: Yes. These are standard-profile ring gaskets designed to fit universally into standard O-ring grooves without any modification. Always verify the inner diameter (ID) and cross-section measurements against your groove specifications before ordering for the best sealing performance.
Q: Can VMQ silicone O-rings be used in food and beverage equipment?
A: VMQ (silicone) O-rings are widely used in food and beverage applications due to their broad temperature resistance and inert properties. However, please verify that the specific grade meets your local food-safety regulations before use in food-contact applications.
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.
Materials + Care
We prioritize quality in selecting the materials for our items, choosing premium fabrics and finishings that ensure durability, comfort, and timeless appeal.
Shipping + Returns
We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.