Design and Manufacture High Performance Automotive Seals

10+ years of experience
Provide a variety of high-quality seals suitable for the automotive industry
Free design and customization of automotive seals
Multiple materials like NBR, FKM, PTFE for oil, fuel, and high-temperature resistance
Delivery within five days at the earliest

Reliable Automotive Seals Manufacturer from China

Velmo is a professional manufacturer of industrial sealing products in China, providing customized automotive sealing solutions for OEMs, Tier 1 suppliers, and aftermarket brands. We offer full-service engineering support from material selection to profile design, mold development, prototyping, and mass production. With advanced compression, injection, and transfer molding capabilities, we help customers solve challenges such as oil resistance, high-temperature stability, chemical compatibility, and long-term durability required in engine, chassis, and drivetrain systems.

Over 10 years, Velmo has accumulated extensive experience in automotive sealing programs, producing millions of O-rings, oil seals, backup rings, gaskets, and rubber-metal bonded parts each year. Our products are widely used in engines, fuel systems, steering systems, braking assemblies, transmissions, and thermal management units. We have supported customers in passenger vehicles, commercial trucks, construction machinery, and agricultural equipment.

What kind of Automotive Seals Can We Make?

Velmo can manufacture a full range of automotive sealing components, including O-rings, oil seals, gaskets, backup rings, and rubber-metal bonded parts for engines, transmissions, braking, and fuel systems. We use NBR, FKM, HNBR, EPDM, silicone, and PTFE to meet oil, heat, and chemical resistance needs. To enhance durability and performance, we offer PTFE coatings, anti-corrosion treatments, precision trimming, bonding, and CNC-machined inserts, ensuring stable quality for OEM and aftermarket projects.

O-rings / X-rings
Oil seals & valve stem seals
Gaskets & custom-cut sealing sheets
PTFE / POM backup rings
Rubber-metal bonded parts
Engine sealing components
Transmission sealing parts
Fuel system sealing parts

Brake system seals
Steering system seals
Thermal management seals
Turbocharger sealing rings
Pump and compressor seals
Sensor and connector seals
Dust boots and bellows
Custom molded rubber profiles

High-pressure hydraulic seals
Fuel injector seals
EV battery system gaskets
Charging system sealing parts
Cooling circuit sealing parts
Air intake & exhaust seals
HVAC sealing components
NVH sealing parts

Automotive Seals Features

Full Customization

Custom sealing profiles, dimensions, hardness levels, bonding structures, and tolerances tailored for engine, transmission, fuel, brake, and steering systems.

Wide Material Options

NBR, FKM, HNBR, EPDM, Silicone, PTFE, POM, and rubber-metal combinations to meet oil, heat, chemical, and high-pressure performance requirements.

Advanced Molding & Manufacturing

Compression, injection, transfer molding, PTFE machining, rubber-metal bonding, CNC insert processing, and automated deflashing for consistent precision.

Strict Quality Testing

Material verification, hardness checks, tensile and aging tests, dimensional inspections, leak and pressure resistance testing for every production batch.

Surface Treatment & Added Processing

PTFE coating, anti-corrosion finishing, polishing, precision trimming, bonded inserts, chamfering, and custom marking available upon request.

Upgrade Your Custom Automotive Seals with Premium Personalization

At Velmo, we customize automatic seals to fit your exact sealing conditions and equipment requirements. From high-pressure hydraulic systems to chemical-resistant environments and specialized material options, we deliver precise, performance-driven backup ring solutions tailored to your application.

Choose the Customized Automotive Seal Sizes

Velmo provides fully customizable dimensions for all automotive sealing components, ensuring a precise fit with shafts, housings, grooves, and dynamic sealing surfaces.

Size Category	Available Range	Description
Inner Diameter (ID)	3 mm – 1,000 mm	Customized to match shaft size and maintain proper interference fit
Outer Diameter (OD)	6 mm – 1,200 mm	Machined or molded to ensure accurate positioning inside the housing
Cross-Section / Width	1.0 mm – 40 mm	Determines sealing contact area and extrusion resistance
Thickness / Height	0.5 mm – 25 mm	Critical for groove depth matching and achieving stable compression
Lip Width (for Oil Seals)	0.5 mm – 5 mm	Affects lubrication film formation and dynamic sealing performance
Metal Jacket / Rubber-Metal Parts (Optional)	Customized	Dimensions tailored to the customer’s housing tolerance and press-fit requirements

All sizes can be tailored to meet OEM tolerances and specific operating conditions across engines, transmissions, braking, and fuel systems.

Customize the Automotive Seal Design & Structure

Velmo provides a full range of sealing structure customization to meet the diverse requirements of engines, transmissions, braking systems, steering assemblies, and fuel systems.

Structure Type	Available Options / Range	Description
Lip Profile Design	Single-lip / Double-lip / Multi-lip	Controls oil retention, dust exclusion, and dynamic sealing stability
Spring-Loaded Structure	With spring / Without spring	Provides consistent radial force and lubrication film formation in shaft seals
Rubber-Metal Bonded Structure	Steel case, aluminum case, rubber-covered frame	Ensures rigidity, accurate positioning, and improved sealing under pressure
PTFE Machined Sealing Seat	Pure PTFE / Filled PTFE (glass, carbon, bronze)	Ideal for high-speed, high-temperature, and chemically aggressive environments
Dynamic vs. Static Sealing Design	Dynamic motion / Static compression	Custom-designed for rotating shafts, reciprocating motion, or static housing grooves
Custom Geometry	According to drawing or OEM specification	Non-standard profiles, chamfers, bevels, grooves, or assembled structures available

Each sealing geometry can be engineered to match shaft conditions, housing tolerances, dynamic motion, and OEM performance requirements.

Velmo offers a broad selection of rubber, elastomer, and engineering plastics to meet the demanding chemical, temperature, and pressure conditions found in engines, transmissions, braking systems, steering assemblies, and fuel systems.

Material Type	Available Grades / Range	Description
NBR (Nitrile Rubber)	Standard / High-acrylonitrile	Excellent oil resistance; widely used for engines, gearboxes, and fuel systems
FKM (Viton / Fluoroelastomer)	Automotive-grade / High-temperature grade	Outstanding heat and chemical resistance; ideal for high-performance and turbocharged systems
HNBR (Hydrogenated NBR)	Automotive sealing grade	Superior heat, oil, and ozone resistance; widely used in timing systems and power steering
EPDM	Peroxide-cured / Automotive coolant grade	Best for brake fluids and cooling systems; excellent weather and steam resistance
Silicone Rubber	Low-temperature silicone / High-temp silicone	Flexible at extreme temperatures; suitable for sensors and low-pressure sealing
PTFE (Polytetrafluoroethylene)	Virgin PTFE / Glass-filled / Carbon-filled / Bronze-filled	High-speed, chemical-resistant sealing; ideal for shaft seals and aggressive media
POM / Engineering Plastics	POM / PA / PEEK	Used for backup rings, precision supports, and high-strength sealing components

Velmo engineers sealing components to withstand the demanding operating environments found in engines, transmissions, braking systems, steering systems, and fuel or coolant circuits.

Performance Category	Available Range	Description
Temperature Resistance	–50°C to +250°C (depending on material)	Ensures stable sealing under cold starts, high heat, turbo systems, and engine bay temperatures
Chemical Compatibility	Oil, fuel, ATF, coolant, brake fluid, additives	Materials selected to resist swelling, degradation, and chemical attack
Pressure Resistance	0–35 MPa (dynamic / static)	For engine oil circuits, pumps, transmission systems, and hydraulic auxiliaries
Dynamic Speed Capability	Up to 30 m/s	Suitable for rotating shafts, gearboxes, and high-speed powertrain components
Friction & Wear Performance	Low-friction / high-wear grades available	Reduces heat generation and extends service life in dynamic applications
Compression & Recovery Behavior	Custom compression set resistance	Ensures long-term sealing ability under continuous load and temperature cycling

Velmo offers a range of surface treatment solutions that enhance the durability, lubrication, corrosion resistance, and installation performance of automotive sealing components.

Treatment Type	Available Options	Description
PTFE Coating	Virgin/PTFE-blended coatings	Reduces friction and heat generation in high-speed shaft seals
Anti-Corrosion Coating	Phosphate, electrophoretic, anti-rust coatings	Protects metal cases and bonded parts from moisture and chemicals
Surface Lubrication	Silicone grease, molybdenum, special lubricants	Improves initial run-in performance and reduces start-up wear
Polishing & Surface Smoothing	Precision lip polishing, case finishing	Enhances sealing stability and improves contact uniformity
Surface Activation for Bonding	Plasma, chemical activation	Ensures strong adhesion between rubber and metal components
Marking & Identification	Ink, laser, or color coding	Enables assembly traceability and easy specification matching

Velmo applies precise dimensional control across molded rubber components, PTFE machined parts, and rubber-metal assemblies.

Tolerance Category	Available Range	Description
Rubber Molded Parts	±0.05 – ±0.10 mm	Meets ISO 3302-1 M2/M3 standards for automotive sealing profiles
PTFE / POM Machined Parts	±0.01 – ±0.03 mm	High-precision control for backup rings and PTFE sealing seats
Oil Seal Case & Metal Inserts	±0.02 – ±0.05 mm	Ensures accurate press-fit and stable positioning in housings
Shaft & Housing Fit Tolerance	Customized to OEM specs	Optimizes interference fit, compression ratio, and sealing stability
Groove & Compression Control	Controlled per drawing	Ensures long-term sealing force and low compression set
Batch Dimensional Reporting	Upon request	Full QC reports for OEM, Tier-1, and high-volume programs

All-in-one Solution to Custom Your Automotive Seals

Study Case from USA IN 2025

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Study Case from USA IN 2025

Study Case from USA IN 2025

Automotive Seals Manufacturer FAQ

What materials can you provide for the seals?

We can provide FFKM, FKM, HNBR, EPDM, Aflas, VMQ, PU, PTFE, PEEK, UHMWPE, Rulon and so on.

How about your design ability?

We have our design department and have offered design services for thousands of cooperative partners. OEM accepts and
offers a confidentiality agreement. a “business secret contract” for your design safe.

For standard sizes product, are they in stock and are the sizes available?

Yes. We have built up a complete inventory. We have sizes and molds for different standard systems in stock so that we can ship quickly.

Which kind information need for quotation?

Sample photo with size or 2D/3D design
Product material
The quantity

How about the samples?

After mold finished, We will make some samples for you to check as soon as we finish the mold.

What’s your delivery time?

For regular products, we keep them in stock. The specific delivery time depends on the items and the quantity of your order, usually 7~25 days.

What’s your delivery time?

For regular products, we keep them in stock. The specific delivery time depends on the items and the quantity of your order, usually 7~25 days.

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