DIN3771 NBR Rubber O-Ring Seal
DIN3771 NBR rubber O-ring seal is a precision sealing component designed for reliable leakage prevention in hydraulic, pneumatic, automotive, machinery, and industrial equipment systems. The DIN3771 NBR rubber O-ring seal is manufactured from nitrile rubber, offering excellent oil resistance, stable elasticity, and dependable sealing performance under pressure.
The DIN3771 NBR rubber O-ring seal follows DIN3771 dimensional requirements, ensuring compatibility with standard groove designs and sealing systems. It is widely used by OEM manufacturers, maintenance teams, equipment builders, and industrial buyers requiring cost-effective and durable sealing components.
Product Overview
The DIN3771 NBR rubber O-ring seal provides reliable static and dynamic sealing in mechanical assemblies. Its circular cross-section allows uniform compression inside grooves, helping prevent leakage of oil, air, water, fuel, and other compatible media.
NBR, also called nitrile rubber, offers strong resistance to petroleum-based oils and fuels. Therefore, this DIN3771 NBR rubber O-ring seal is a practical choice for hydraulic cylinders, pumps, valves, compressors, and automotive systems.
As an important industrial sealing component, it supports stable equipment operation, reduces maintenance risk, and improves system reliability.
Product Specifications
| Item | Description |
|---|---|
| Standard | DIN3771 |
| Product Name | DIN3771 NBR Rubber O-Ring Seal |
| Material | NBR / Nitrile Rubber |
| Seal Type | O-Ring Seal |
| Cross Section | Round |
| Hardness | 70 Shore A standard, custom available |
| Diameter Range | Standard DIN sizes / Custom sizes |
| Length Range | Not applicable |
| Surface Finish | Smooth molded rubber surface |
| Color | Black / Custom |
| Temperature Range | -30°C to 100°C typical |
| Packaging | Bag, carton, labeled package, OEM packaging |
| Customization | Size, hardness, color, material compound, packaging |
Technical Parameters
| Parameter | Value |
|---|---|
| Tensile Strength | 10–20 MPa, depending on compound |
| Elongation at Break | 150%–300% typical |
| Hardness | 50–90 Shore A available |
| Density | Approx. 1.20–1.35 g/cm³ |
| Oil Resistance | Excellent |
| Operating Temperature | -30°C to 100°C typical |
| Compression Set | Low to medium, compound dependent |
| Manufacturing Standard | DIN3771 / OEM specification |
Materials and Manufacturing Process
The DIN3771 NBR rubber O-ring seal is produced through controlled rubber molding and finishing processes.
Production begins with selected nitrile rubber compound. The raw rubber is mixed with curing agents, fillers, and performance additives. Then, the compound is prepared for compression molding, transfer molding, or injection molding.
Mold cavities are designed according to DIN3771 dimensions. During curing, pressure and temperature are controlled to achieve stable elasticity and sealing performance. After molding, excess flash is removed through trimming or cryogenic deflashing.
The process also includes post-curing when required, surface cleaning, dimensional inspection, hardness testing, appearance inspection, and packaging. Each DIN3771 NBR rubber O-ring seal is checked to ensure smooth surface quality, accurate cross-section, and reliable sealing performance.
Applications of the Product
DIN3771 NBR rubber O-ring seals are widely used in hydraulic systems, pneumatic cylinders, automotive engines, fuel systems, pumps, valves, compressors, construction machinery, agricultural equipment, industrial equipment, manufacturing systems, and maintenance kits.
They are also suitable for oil-resistant sealing in gearboxes, pipe fittings, mechanical connectors, and OEM equipment assemblies. Because NBR performs well with mineral oils and many fuels, it is a common material for machinery and automotive sealing.
Why Choose This Product
This product offers excellent oil resistance, stable sealing performance, flexible compression recovery, cost-effective production, and wide DIN size availability. It supports custom hardness, custom dimensions, OEM packaging, bulk supply, and fast delivery.
The DIN3771 NBR rubber O-ring seal is suitable for engineers and purchasing teams needing reliable sealing components for industrial equipment and maintenance projects.
Why Choose Flybear
Flybear provides industrial fastening and sealing solutions for global customers.
Flybear supports custom production, stable inventory, engineering consultation, global supply, and technical support. We work with OEM manufacturers, distributors, EPC contractors, and industrial buyers to provide reliable components based on drawings, samples, or application requirements.
Quality Inspection and Control
Quality control includes material compound inspection, hardness testing, tensile testing, elongation testing, compression set testing, dimensional inspection, visual surface inspection, aging resistance testing, oil resistance testing, and packaging inspection.
Production follows ISO quality system compliance to ensure stable batch quality and reliable industrial performance.
Selection Guide
When selecting DIN3771 NBR rubber O-ring seals, consider inner diameter, cross-section size, groove design, hardness, working pressure, temperature, sealing medium, movement type, and corrosion or chemical exposure.
For oil and fuel applications, NBR is usually suitable. For high-temperature or strong chemical environments, alternative materials such as FKM, EPDM, or silicone may be considered.
FAQ
What is DIN3771?
DIN3771 is a standard commonly used for O-ring dimensions and sealing applications.
What is NBR rubber?
NBR is nitrile rubber, known for excellent oil and fuel resistance.
Can NBR O-rings be used with water?
Yes, they can seal water in many applications, but EPDM may be better for hot water or steam.
Can custom sizes be produced?
Yes. Custom size, hardness, color, and compound options are available.
How to request quotation?
Send size, material, hardness, quantity, application medium, and drawings if available.
The DIN3771 NBR rubber O-ring seal provides reliable oil-resistant sealing for industrial systems. For quotation, customization, and technical support, please Contact Us.
We always adhere to the philosophy of quality first and customer first, providing customers with high-quality fastener products and one-stop fastener solutions.
