FKM O-Ring 31.5 × 3.55mm for Automotive & Electronics Sealing Applications

The FKM O-Ring (31.5 * 3.55mm) is a high-performance sealing component manufactured from Fluoroelastomer (FKM), widely recognized for its exceptional resistance to high temperatures, oils, fuels, chemicals, and harsh environmental conditions. Designed for demanding automotive and electronic applications, this O-ring provides reliable static and dynamic sealing performance, helping prevent leakage, contamination, and pressure loss.

Compared with conventional NBR or EPDM seals, FKM O-rings offer superior durability and longer service life in aggressive environments. They are widely used in automotive fluid systems, electronic enclosures, sensors, pumps, valves, connectors, battery systems, and industrial equipment where high reliability is required.

The 31.5 * 3.55mm specification provides an excellent sealing solution for medium-sized assemblies requiring precise compression and consistent sealing performance under varying temperatures and pressures.

Many manufacturers experience sealing problems that can lead to product failure, warranty claims, and increased maintenance costs.

Common sealing challenges include:

• Oil leakage in automotive systems
• Fuel permeation and seal degradation
• Chemical corrosion of conventional rubber seals
• Moisture ingress into electronic devices
• Premature aging caused by heat exposure
• Cracking and hardening during long-term operation
• Reduced sealing performance under pressure fluctuations
• Equipment downtime caused by seal failure

In industries such as automotive manufacturing and electronics production, even a minor sealing failure can result in significant operational and financial losses.

Our FKM O-Ring 31.5 * 3.55mm is engineered to address these challenges by delivering:

Resistant to oils, fuels, lubricants, hydraulic fluids, solvents, and many industrial chemicals.

Suitable for continuous operation in elevated temperature environments where conventional elastomers may fail.

Maintains elasticity and sealing performance over extended service periods.

Ensures consistent sealing force even after long-term compression.

Performs reliably under UV exposure, ozone, and outdoor conditions.

Reduces maintenance frequency and lowers replacement costs.

Available in customized sizes, hardness levels, colors, and material grades according to customer requirements.

The FKM O-ring is widely used in:

• Fuel injectors
• Fuel pumps
• Fuel system connectors
• Engine sealing systems
• Turbocharger assemblies
• Hydraulic systems
• Transmission systems
• Automotive sensors
• EV battery pack sealing
• Cooling system components

• Prevents oil and fuel leakage
• Withstands high engine temperatures
• Extends equipment service life

Suitable for:

• Waterproof electronic housings
• Sensor enclosures
• Battery packs
• Connectors
• Industrial control equipment
• Communication devices
• LED lighting systems
• Power management modules

• Protects against moisture ingress
• Improves IP sealing performance
• Ensures long-term reliability

Commonly used in:

• Pumps
• Valves
• Compressors
• Pneumatic systems
• Hydraulic equipment
• Chemical processing equipment

• Maintains sealing under pressure
• Resists aggressive chemicals
• Reduces maintenance downtime

An FKM O-ring functions by creating a compression seal between two mating surfaces.

When installed into a groove and compressed during assembly, the O-ring deforms elastically and fills the microscopic gaps between mating components. This compression generates sealing force that blocks the passage of liquids, gases, dust, and contaminants.

During operation:

1. Initial compression creates the primary seal.
2. System pressure enhances sealing effectiveness.
3. FKM material maintains elasticity under heat and chemical exposure.
4. Continuous contact pressure prevents leakage throughout the service life.

This simple yet highly effective sealing mechanism makes O-rings one of the most widely used sealing solutions across multiple industries.

Selecting the correct O-ring is critical for optimal sealing performance.

Verify the installation groove size and required compression ratio.

Evaluate the fluids, fuels, oils, or chemicals the seal will contact.

FKM is recommended for high-temperature applications up to approximately 200°C.

Higher pressure applications may require backup rings or specialized designs.

Common hardness ranges:

• 60 Shore A – Better flexibility
• 70 Shore A – Standard industrial use
• 75–90 Shore A – Higher pressure resistance

For export projects, verify RoHS, REACH, FDA, or industry-specific compliance requirements.

FKM offers significantly better resistance to high temperatures, fuels, chemicals, and aging. It is ideal for demanding automotive and industrial environments where NBR may degrade over time.

Yes. We can manufacture custom FKM O-rings according to drawings, samples, or international standards, including AS568, ISO, JIS, and metric sizes.

The standard FKM material typically operates from -20°C to +200°C. Special formulations can be developed for more demanding conditions.

Yes. FKM exhibits excellent resistance to gasoline, diesel fuel, lubricants, and various automotive fluids, making it a preferred choice for fuel system sealing.

Yes. Samples are available for performance evaluation, assembly verification, and compatibility testing before placing bulk orders.

Looking for a reliable FKM O-Ring supplier for automotive, electronics, or industrial sealing applications?

We provide:

• Custom Sizes & Designs
• OEM & ODM Manufacturing
• Fast Sampling Service
• Stable Quality Control
• Export Packaging Solutions
• Global Shipping Support

Send us your drawing, size requirements, or application details today, and our engineering team will recommend the most suitable FKM sealing solution for your project.