Custom manufacturing example · Hot-selling FKM NBR rubber washer/small sizes O-ring

CUSTOM RUBBER & SILICONE MANUFACTURING

Hot-selling FKM NBR rubber washer/small sizes O-ring

A custom component for your assembly.

Define the mating surfaces, dimensions and working conditions. ETOL manufactures the part to the agreed design and material.

Factory direct
Made to order
Drawing & sample support

Share the part, its application and your estimated quantity.

Customize the fit, material and finish

Vulcanization workshop illustration with green molding presses and blue collection bins

Material & hardness

Selected for the contact, temperature and movement

Color & finish

Define the visible surfaces and intended color

Shape & dimensions

Develop holes, lips and walls around the mating parts

Mounting & fit

Match the attachment and installation method

Product Overview

For small sizes O-ring selection, section diameter matters as much as the size of the opening the ring surrounds. FKM and NBR are different material options in this custom washer and ring offering. Choose the compound for the actual fluid and temperature before comparing the finished dimensions.

At a compact scale, a small particle or twist can affect a noticeable portion of the contact region. Handle the ring on a clean surface and avoid stretching it across sharp features unnecessarily. The groove should receive the intended section without forcing the rubber into an undersized space.

Check the ring after positioning and before the mating component hides it. Close the assembly through its normal locating arrangement so that the seal is not pinched at one side. During maintenance, keep visually similar variants separated by material and size. Replace a cut or permanently flattened ring with the specified profile rather than using an approximately sized washer or a different compound simply because it is available.

Material options: NBR / FKM. Custom formulation and color for the intended contact conditions.
Hardness selection: Rubber: 30–90 Shore A. For a small O-ring, compare grade and section diameter together; limited groove space can make a small section change important to compression.
Custom dimensions: The groove should receive the intended section without forcing the rubber into an undersized space.
Fit & assembly: Close the assembly through its normal locating arrangement so that the seal is not pinched at one side.
Use & inspection: Replace a cut or permanently flattened ring with the specified profile rather than using an approximately sized washer or a different compound simply because it is available.

Photos illustrate structure or material only. For small sizes O-ring selection, section diameter matters as much as the size of the opening the ring surrounds. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.

Choosing a material or hardness? Explore the selection guide →

From part requirements to production

Define the part

Identify key dimensions, mating surfaces and quantity

Review material & tooling

Agree the compound and manufacturing approach

Evaluate the sample

Review the fit and agreed requirements in the assembly

Produce & inspect

Manufacture and check against the approved requirements

Review the intended assembly

Working conditions

Identify temperature, contact fluids and repeated movement.

Material and structure

Consider hardness together with wall thickness and support.

Installation

Check access, mating dimensions and the fitting sequence.

Ordering this custom component

Can the shape be adjusted to my mating parts?

Yes. Show the receiving opening, contact surfaces and clearance limits. We can review the dimensions and retaining features around the intended fit.

Which details should be agreed before tooling?

Agree the critical dimensions, material, hardness, visible surfaces and sample requirements. Explain how the part is installed and which interfaces control its function.

Can a sample help define the replacement?

A sample can help explain the structure. Compare it with the assembly because wear, swelling or compression may have changed its original dimensions.

How is the quotation for this part determined?

The material, part geometry, tooling, quantity and finishing affect the quotation. Include the intended batch size and delivery destination when describing your requirements.

DISCUSS THIS COMPONENT

Describe the part you need.

Share the fit, operating conditions and quantity with our manufacturing team.