Working conditions
Identify temperature, contact fluids and repeated movement.
Custom manufacturing example · Colorful silicone cover/oil proof (NBR) rubber caps/plug
CUSTOM RUBBER & SILICONE MANUFACTURING
Colorful silicone cover/oil proof (NBR) rubber caps/plug
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
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
Rubber caps provide a custom molded cover over an end feature, while a plug-style version closes an internal opening. The profile should be chosen for the actual receiving surface. For oil exposure, the exact compound needs to be selected before color or external appearance is finalized.
Consider the particular oil, operating temperature, and duration of contact. NBR and silicone should not be treated as interchangeable simply because they can be made in similar colors. The selected material must also suit any cleaning substances used around the closure.
Check the seating length and accessible removal area, then fit the cap onto a clean, smooth feature. Avoid stretching it excessively over an oversized end or driving a plug deeper to hide a loose fit. Inspect the rubber after use for swelling, cracks, or permanent changes in shape. The complete closure determines its sealing and retention requirements, so a material name alone does not establish an oil-proof guarantee. Replace damaged parts with the matching geometry and specified compound.
- Material options
- Custom silicone or NBR formulation; select the compound alongside the mating geometry.
- Hardness selection
- Silicone: 20–80 Shore A; solid rubber: 30–90 Shore A. Avoid stretching it excessively over an oversized end or driving a plug deeper to hide a loose fit.
- Custom geometry
- The profile should be chosen for the actual receiving surface.
- Fit evaluation
- For oil exposure, the exact compound needs to be selected before color or external appearance is finalized.
- Color & OEM
- Custom colors; OEM identification positioned outside closure contact surfaces.
Photos illustrate structure or material appearance only. Rubber caps provide a custom molded cover over an end feature, while a plug-style version closes an internal opening. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.
FIND THE RIGHT FIT
End Cap Size Catalog
Compare inside diameter A with the outside of the part being covered. Check inside depth C and overall dimensions B and D for available clearance. These RSE references show a round cap with one closed end.
RSE End Caps
43 closed-end cap sizes. A is the inside diameter and C is the usable internal depth; B and D describe the outside envelope.
DIMENSION GUIDE
PRODUCT APPEARANCE
| P/N | A | B | C | D | Color | Unit |
|---|---|---|---|---|---|---|
| RSE3.7-7-9 | 3.7 | 7 | 9 | 11 | black,white | mm |
| RSE4.7-8-9 | 4.7 | 8 | 9 | 11 | black,white | mm |
| RSE5.7-9-10 | 5.7 | 9 | 10 | 12 | black,white | mm |
| RSE6.7-10-10 | 6.7 | 10 | 10 | 12 | black,white | mm |
| RSE7.7-11-11 | 7.7 | 11 | 11 | 13 | black,white | mm |
| RSE8.7-12-12 | 8.7 | 12 | 12 | 14 | black,white | mm |
| RSE9.7-14-13 | 9.7 | 14 | 13 | 15 | black,white | mm |
| RSE10.7-15-14 | 10.7 | 15 | 14 | 16 | black,white | mm |
| RSE11.7-16-15 | 11.7 | 16 | 15 | 17 | black,white | mm |
| RSE12.7-17-15 | 12.7 | 17 | 15 | 18 | black,white | mm |
| RSE13.7-18-15 | 13.7 | 18 | 15 | 18 | black,white | mm |
| RSE14.7-19-15 | 14.7 | 19 | 15 | 18 | black,white | mm |
| RSE15.7-20-16 | 15.7 | 20 | 16 | 19 | black,white | mm |
| RSE16.7-21-16 | 16.7 | 21 | 16 | 19 | black,white | mm |
| RSE17.7-22-16 | 17.7 | 22 | 16 | 19 | black,white | mm |
Need a different fit? Share the opening dimensions, mating profile and intended use for a custom size.
From part requirements to production
01
Define the part
Identify key dimensions, mating surfaces and quantity
02
Review material & tooling
Agree the compound and manufacturing approach
03
Evaluate the sample
Review the fit and agreed requirements in the assembly
04
Produce & inspect
Manufacture and check against the approved requirements
Review the intended assembly
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.
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