We’re committed to helping clients lower sourcing costs and increase product sales. Today, over 95% of our customers come back to reorder. You can start your inquiry from just 1 PC — no MOQ required.
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OEM-grade seals, flexible MOQ, and 100% material traceability.
Thousands of O-Ring sizes in stock. Most standard items ship within 72 hours. No delays, no headaches.
More than 95% of our clients reorder — thanks to consistent quality, reliable delivery, and responsive service.
Work directly with the manufacturer. No trading margin. No middleman. Competitive price guaranteed.
From NBR to FDA-grade Silicone and FKM, we offer the right compound for every sealing application.
Fast handling. Most orders are dispatched within 3 working days, with urgent delivery available.
Order from 1 piece. Perfect for prototyping, urgent repair, or low-volume needs.
Explore our full range of O-Rings by material, size, and application. All sizes available with no MOQ.
| Material | Inner Diameter (ID) (mm) |
Outer Diameter (OD) (mm) |
Cross-Section (CS) (mm) |
Key Applications |
|---|---|---|---|---|
| NBR (Nitrile) | 3 – 300 | 5 – 350 | 1.5 – 4 | Oil, fuel, hydraulic seals |
| FKM (Viton®) | 3 – 300 | 5 – 350 | 1.5 – 4 | High-temp, chemical resistance |
| EPDM | 3 – 300 | 5 – 350 | 1.5 – 4 | Steam, water, outdoor use |
| VMQ (Silicone) | 3 – 300 | 5 – 350 | 1.5 – 4 | Food-grade, medical, non-toxic |
Standard O-ring Seals: Typically $0.01 to $2.00 per unit depending on material and size.
Specialized Seals:Prices range from $1.00 to $5.00 per unit.
Custom Orders: Pricing for custom orders depends on the specifications such as material, quantity, and complexity.
Our streamlined process guarantees quick turnaround times while maintaining superior sealing performance for all applications.
1-5 business days (depending on order volume).
Delivery time can be 5-10 business days for highly customized products.
Typically 7-14 days for international orders, depending on your location.
We are committed to providing quick and reliable service, ensuring your O-ring seals are delivered in the shortest time possible without compromising on quality.
We work efficiently to deliver high-quality O-ring seals on time. Here’s a breakdown of the whole production process:
We design O-ring seals based on customer specifications and manufacture them using high-quality materials like NBR, FKM, and EPDM to ensure premium quality.
Every batch of O-ring seals undergoes strict quality control and testing to ensure pressure resistance and leak-proof performance, meeting industry standards.
Once production is complete, the O-ring seals are securely packed and shipped via reliable carriers to ensure timely delivery.
For custom orders, we precisely adjust the size and material of the O-rings to meet your specific requirements, ensuring a perfect fit.
An O-ring is a circular sealing element made of rubber or elastomer, used to block the passage of liquids or gases between two parts. It fits into a groove and is compressed during assembly to form a tight seal.
To measure an O-ring, use a caliper to determine the inner diameter (ID), outer diameter (OD), and cross-section (CS). The formula is:
OD = ID + 2 × CS.
Accurate measurements ensure proper sealing performance.
O-rings are widely used in hydraulic systems, automotive engines, industrial pumps, and pneumatic tools. They prevent leakage in both static and dynamic applications under pressure, heat, and chemical exposure.
You can buy high-quality O-rings directly from manufacturers like Hengoseal.com, which offers a wide range of sizes, materials (NBR, FKM, EPDM, etc.), and supports custom orders with no MOQ.
O-rings work by being compressed inside a groove between two surfaces. When pressure is applied, the O-ring deforms and creates a barrier that blocks the path of fluids or gases, forming a leak-proof seal.
To shrink an O-ring temporarily, place it in cold water or a freezer for a few minutes. This causes the rubber to contract slightly, which can help during assembly. However, it will return to its original size at room temperature.
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