Product Overview
Reliable custom rubber parts for industrial applications
Quick Answer
Silicone protective caps, also called Silikon Deckel-Schutzhaube, are molded silicone covers for compatible components, housing openings, connector areas, cable-end areas and exposed assembly surfaces. Opening size, cap depth, wall thickness, silicone compound, Shore A hardness, color, dimensional tolerance and packaging can be customized according to confirmed specifications or samples.
Silicone protective caps, also known as Silikon Deckel-Schutzhaube, are flexible molded silicone covers used to protect compatible component openings, cover interfaces, connector areas or exposed assembly surfaces. They can help reduce dust contact, splash exposure, abrasion and handling damage when the cap geometry matches the protected part. Size, hardness, color, wall thickness and packaging are available upon request.
Silicone Protective Caps — RoHS Compliant Cover Caps for Terminal and Component Protection
Silicone protective caps, known in German as Silikon Deckel-Schutzhaube, are precision-molded silicone rubber cover caps designed to shield terminal ends, connectors, or small component features from dust, moisture, and mechanical damage. Built to a reference outer diameter of Ø19mm with a stepped internal bore, these caps are manufactured in black and formulated to meet RoHS compliance for electrical and electronic assembly use.
Key Specifications
| Parameter | Specification |
|---|---|
| Product Title | Silicone Protective Cap (Silikon Deckel-Schutzhaube) |
| Outer Diameter | Ø19 mm |
| Base Diameter | Ø49.3 mm |
| Internal Bore Diameter 1 | Ø16 mm (+0/-0.1 mm) |
| Internal Bore Diameter 2 | Ø13.5 mm (+0/-0.1 mm) |
| Wall/Step Dimension | 2.3 mm (+0/-0.1 mm) |
| Height/Depth Reference | 9.5 mm, 13.3 mm |
| Chamfer | 1.5 x 45° |
| Edge Radii | R0.3 (multiple locations) |
| Thread Reference | M4 gr. (rough/coarse) |
| Material Options | HD-09540/40 black, or ELASTOSIL R plus 4001/40 black |
| Compliance | RoHS |
| General Tolerance Standard | DIN ISO EN 3302-M3 |
| Reference Scale | 2:1 |
What Are Silicone Protective Caps?
Silicone protective caps are closed-end silicone rubber covers molded to fit snugly over a specific stepped feature, terminal, or fastener head, sealing it against dust, moisture, and impact while remaining flexible enough to be removed and reinstalled as needed. Built to a reference profile with an outer cap diameter of Ø19mm and a wider base diameter of Ø49.3mm, this design incorporates a stepped internal bore, with primary steps at Ø16mm and Ø13.5mm (each held to +0/-0.1mm tolerance), allowing it to seat precisely over a matching stepped component or terminal end. A reference M4 thread feature and multiple small edge radii (R0.3) further indicate this cap is engineered to fit a specific fastener or connector geometry rather than serving as a generic universal cover.
Dimensional Profile
| Feature | Reference Value |
|---|---|
| Outer cap diameter | Ø19 mm |
| Base flange diameter | Ø49.3 mm |
| Internal bore step 1 | Ø16 mm (+0/-0.1 mm) |
| Internal bore step 2 | Ø13.5 mm (+0/-0.1 mm) |
| Wall/step thickness | 2.3 mm (+0/-0.1 mm) |
| Depth references | 9.5 mm, 13.3 mm |
| Edge chamfer | 1.5 mm x 45° |
| Corner/edge radii | R0.3 (5 locations) |
| Thread feature | M4, coarse/rough pitch |
The stepped internal bore combined with the chamfered lead-in edge (1.5mm x 45°) allows the cap to guide smoothly onto its mating component during assembly, while the tight ±0.1mm tolerances on the two primary bore diameters ensure a consistent, repeatable friction fit across production batches.
Material Options and Properties
This cap is offered in two silicone compound options, both supplied in black:
- HD-09540/40 black: A general-purpose silicone rubber compound suited to standard protective covering duty.
- ELASTOSIL R plus 4001/40 black: A high-consistency silicone rubber (HCR) compound known for strong mechanical properties, good compression set resistance, and reliable long-term sealing performance.
Both compounds deliver the flexibility, dust/moisture resistance, and durability expected of a silicone protective cap, with the choice between them depending on specific mechanical or processing requirements.
Key Features
- Stepped internal bore (Ø16mm/Ø13.5mm) matches a specific terminal or fastener geometry for a secure, repeatable fit.
- Chamfered lead-in edge (1.5mm x 45°) allows smooth, guided installation over the mating component.
- RoHS compliant material formulation for electrical and electronic assembly use.
- Available in two silicone compound grades to match mechanical or performance requirements.
- Tight manufacturing tolerances (+0/-0.1mm) on critical bore dimensions per DIN ISO EN 3302-M3.
- Reference M4 thread feature supports fastener-style mating components.
Common Applications
- Protective cover for terminal ends and connector interfaces.
- Dust and moisture cap for fastener heads or stud ends in electrical assemblies.
- Component end protection on transformers, coils, and inductive devices.
- General electrical and electronic assembly component covers.
- Industrial equipment feature protection where a stepped-bore cap is required.
Why Choose Silicone for Protective Caps
Silicone rubber is a preferred material for protective caps because of its strong flexibility, resistance to aging, ozone, and UV exposure, and stable performance across a wide temperature range compared to many general-purpose rubber compounds. These properties allow the cap to be repeatedly installed and removed without cracking or losing its shape, while maintaining a reliable seal against dust and moisture over the component’s service life.
Custom Manufacturing Options
- Custom bore diameters and step geometry to match specific terminal or fastener profiles.
- Custom outer diameter and base flange size beyond the Ø19mm/Ø49.3mm reference.
- Custom compound selection (general-purpose or high-consistency silicone rubber).
- Custom color for identification across different cap sizes or applications.
- Custom thread feature sizing to match alternate fastener standards.
FAQ
What are silicone protective caps used for?
Silicone protective caps are used to cover compatible components, housing openings, connector areas, cable-end areas and exposed assembly surfaces. They help provide flexible protection during assembly, storage, transport or service when the cap geometry matches the protected part.
What does Silikon Deckel-Schutzhaube mean?
Silikon Deckel-Schutzhaube is a German product term for a silicone lid protection cover or silicone protective cap. In this product context, it refers to a molded silicone cover used for component protection, cover protection and assembly protection.
Are the dimensions fixed?
No fixed dimensions are listed for this product because confirmed dimensional data has not been provided. Overall length, width, height, opening size, wall thickness, cap depth and tolerance should be confirmed before quotation, sampling or production.
Can the silicone material and hardness be customized?
Yes. Silicone compound and Shore A hardness can be reviewed according to flexibility, installation force, removal force, tear resistance, temperature exposure and protection requirements. Hardness is available upon request.
Can the opening size and cap depth be adjusted?
Yes. Opening size, cap depth, wall thickness and body profile can be adjusted according to the protected component and required fit. These items affect installation force, retention, durability and protective coverage.
Are samples available before bulk production?
Samples are available upon request. Sample preparation depends on confirmed size, silicone compound, Shore A hardness, color, tooling status, packaging method and inspection requirements. A physical component or confirmed specification helps verify fit before batch production.
Request a Custom Quote
Send the confirmed specification, CAD file, protected component sample or physical part for review. Please include opening size, cap depth, wall thickness, silicone material, hardness, color, operating environment, quantity, annual demand, compliance requirements and packaging method.
