Custom Rubber Cap

Custom rubber caps protect components with Flexiparts's rubber expertise.

Custom Molded Rubber Caps and Plugs

Flexiparts manufactures custom rubber caps and plugs for protection, sealing, and covering components. We offer engineered tooling, flexible material and hardness options, and stable production for complex shapes and non-standard sizes used in industrial, automotive, and electronic applications.

Getting a custom rubber cap solution is simple — send us your drawing or sample, and we’ll handle mold design, quoting, and production. Contact us anytime via our website, email, or phone to start your project.

Rubber Cap Solutions Built to Your Needs

Rubber caps are available in a wide range of sizes, materials, and shapes, with each product manufactured to meet the specific requirements of our customers. Below are examples of custom solutions we have delivered across different industries, demonstrating the versatility and reliability of our custom rubber caps.

*Please note: The molded rubber parts shown below are not in stock — these parts were Flexiparts Plastics customized for other customers.

LET’S START A NEW CUSTOM RUBBER PARTS

Tell us your requirement, our engineers help you make it a reality!

Rubber Cap Design Suggestions

When customizing rubber caps, focus on the fit (tightness/retention) and required function (e.g., masking, sealing, aesthetics). Determine the inner diameter (ID) and wall thickness needed for a secure grip on the component. Choose materials that can withstand the operational environment, such as high heat for masking applications (like powder coating) or chemical resistance for industrial use. Ensure the material has the necessary flexibility or tear resistance for repeated application and removal.

Rubber Cap Manufacturing Methods

These processes are suitable for producing flexible rubber end caps, threaded rubber caps, tapered plugs, and custom rubber caps with consistent quality and required flexibility.

Material

Our custom rubber caps are available in a variety of high-performance elastomers and flexible polymers:

Silicone (MVQ)
Ethylene Propylene Diene Monomer (EPDM)
Nitrile (NBR)
Neoprene (CR)
Vinyl (PVC)
Thermoplastic Rubber (TPR)

Benefit

Protect threads, tubes, and rods from damage during transport or storage.
Act as effective masking solutions for powder coating, painting, or plating processes.
Seal ports and openings against dust, moisture, and debris.
Provide electrical insulation and a neat finish.
Highly flexible for easy application and secure fit.
Durable and resistant to chemicals, abrasion, and temperature extremes.

Application

Rubber caps and plugs are widely used across multiple industries:

Automotive: Protecting brake lines, fuel ports, and cable ends.
Metal Finishing: Masking bolts or critical surfaces during painting and plating.
Electronics: Covering connectors and providing insulation.
General Industrial: Protecting pipe and tube ends during shipping.
Furniture: As protective feet or decorative end covers.

Related FAQs of Rubber Caps

What is the difference between a rubber cap and a rubber plug?

A rubber cap fits over the outside of a part, while a rubber plug fits inside a hole or opening. Rubber caps are preferred when the opening needs external protection or frequent removal.

Can rubber caps be used to cover holes?

Yes. A rubber cap for a hole covers the opening from the outside without inserting into it. This is useful when internal sealing is not possible or when quick access is required.

Are black rubber caps better for industrial use?

Yes. Black rubber caps are widely used in industrial environments because they offer better UV resistance, hide wear marks, and match standard equipment aesthetics.

Can rubber caps be custom-made to fit specific parts or dimensions?

Yes. We manufacture custom rubber caps according to your drawings or samples, ensuring a precise fit for any shape, size, or functional requirement.

Can rubber caps be produced in different hardness, colors, or materials?

Yes. With years of experience in custom rubber manufacturing, we can easily produce rubber caps in any required hardness, color, or material, ensuring they meet your application’s specific performance needs.

What Our Customers Say

Check what our customers say about us, why they like to work with us!

Flexiparts pays attention to detail. We’re happy with their plastic and rubber molds. Communication is fast and efficient, and their support is great.

Edward

France

Working with Flexiparts has been great. The injection-molded parts are always top quality. We really appreciate your professionalism with delivery and project management