Product Overview
Reliable custom rubber parts for industrial applications
Quick Answer
Silicone terminal insulating boots, also called Silikon-Schutzhaube, are molded silicone protective covers for electrical terminals, connectors and cable ends. The provided size reference is 117 × 22. Opening size, wall thickness, body profile, silicone compound, Shore A hardness, color, tolerance and packaging can be customized according to drawings or samples.
Silicone terminal insulating boots, also known as Silikon-Schutzhaube, are flexible protective covers used to insulate terminals, connectors, cable ends and electrical contact points. The provided size is 117 × 22. Silicone rubber provides flexibility, insulation support and heat resistance for electrical assemblies. Material grade, hardness, wall thickness, opening structure and tolerance can be customized according to drawings or samples.
Silicone Terminal Insulating Boots — RoHS Compliant Protective Covers for Electrical Terminals
Silicone terminal insulating boots are precision-molded silicone rubber covers designed to slip over electrical terminals, connectors, or transformer leads, providing insulation, mechanical protection, and environmental sealing at the connection point. Built in a reference 117 x 22mm profile and manufactured in black, these boots are RoHS compliant and engineered for reliable long-term performance in electrical assembly applications.
Key Specifications
| Parameter | Specification |
|---|---|
| Product Title | Silicone Protective Boot 117×22 |
| Reference Overall Length | 117 mm (major axial dimension) |
| Reference Outer Diameter | 22 mm |
| Primary Bore Diameter 1 | Ø14 mm (± 0.2 mm) |
| Primary Bore Diameter 2 | Ø14.2 mm (± 0.2 mm) |
| Secondary Hole Diameter | Ø7.5 mm (2 places) |
| Weight | 0.02 kg |
| 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 | 1.5:1 |
What Are Silicone Terminal Insulating Boots?
Silicone terminal insulating boots are hollow, contoured silicone rubber sleeves that fit over an electrical terminal or lead exit point, sealing and insulating the connection while providing strain relief and mechanical protection against abrasion, moisture, and dust. Built to a reference profile of 117mm overall length and 22mm outer diameter, this boot design incorporates multiple internal bore steps, including a primary bore of Ø14mm and Ø14.2mm (each with ±0.2mm tolerance) and two secondary Ø7.5mm through-holes, allowing it to accommodate specific terminal geometries and multi-lead configurations. The part is manufactured under RoHS compliance, confirming it meets restrictions on hazardous substances for use in electrical and electronic assemblies.
Dimensional Profile
| Feature | Reference Value |
|---|---|
| Axial length reference points | 18, 31.5, 51.5, 76.5, 105.5, 116.5 mm |
| Bore diameter (section 1) | Ø14 mm ± 0.2 mm |
| Bore diameter (section 2) | Ø14.2 mm ± 0.2 mm |
| Secondary through-hole diameter | Ø7.5 mm (2 places) |
| Key radii | R1.5, R10.5 |
| Key wall/step dimensions | 3 ± 0.1 mm, 2.5 ± 0.1 mm |
| Draft/taper angles | 27°, 29°, 6°, 3° |
| Reference width dimensions | 25.5 mm, 22 mm, 21 mm, 17 mm, 14 mm, 9 mm |
| Small feature dimensions | 1.5, 1.75, 2, 4, 8.5, 9.5, 11, 12.5, 16.5 mm |
These stepped diameters, tapered angles, and precision radii work together to form a contoured internal profile that seats securely over a stepped terminal or lead geometry, ensuring the boot stays seated without slipping during handling or in service.
Material Options and Properties
This boot is offered in two silicone compound options, both supplied in black:
- HD-09540/40 black: A general-purpose silicone rubber compound suited to standard insulation and protection 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 provide the electrical insulation, flexibility, and environmental resistance expected of silicone rubber, while allowing selection based on specific mechanical or processing requirements.
Key Features
- Precision stepped-bore internal profile matches specific terminal or lead geometries.
- Dual bore diameters (Ø14mm and Ø14.2mm) accommodate slightly different terminal sizes within the same boot design.
- Two Ø7.5mm secondary through-holes support additional lead or wire routing.
- RoHS compliant material formulation for electrical and electronic assembly use.
- Available in two silicone compound grades to match mechanical or performance requirements.
- Lightweight construction at approximately 0.02 kg per unit.
- Tight manufacturing tolerances per DIN ISO EN 3302-M3 general tolerance standard.
Common Applications
- Transformer lead and terminal insulation covers.
- Electrical connector strain relief and environmental sealing boots.
- Multi-lead wire exit protection on coil or inductive components.
- General electrical assembly insulation where a contoured silicone boot is required.
- Industrial and electronic equipment terminal protection.
Why Choose Silicone for Terminal Insulation
Silicone rubber is a preferred material for terminal insulating boots because of its strong dielectric insulation properties, wide operating temperature range, and resistance to aging, ozone, and UV exposure compared to many general-purpose rubber compounds. These properties make silicone boots well suited to electrical components that may be exposed to temperature cycling, outdoor conditions, or long service life requirements, while the material’s flexibility allows the boot to stretch over stepped terminal geometries and maintain a secure, insulating fit.
Custom Manufacturing Options
- Custom bore diameters and step geometry to match specific terminal profiles.
- Custom overall length and outer diameter beyond the 117 x 22mm reference.
- Custom compound selection (general-purpose or high-consistency silicone rubber).
- Custom color for identification across different terminal types.
- Custom secondary hole count, size, and placement for multi-lead configurations.
FAQ
What are silicone terminal insulating boots used for?
Silicone terminal insulating boots are used to cover and protect electrical terminals, connectors, cable ends and conductive contact areas. They help reduce accidental contact, dust entry, moisture splash and mechanical abrasion when the boot geometry fits the terminal and cable structure correctly.
What does Silikon-Schutzhaube mean?
Silikon-Schutzhaube is a German term that can describe a silicone protective cover or silicone protection boot. In this product context, it refers to a silicone terminal insulating boot used to protect electrical connection areas and terminal interfaces.
Can the dimensions be customized?
Yes. Overall size, opening size, wall thickness, cable exit position, boot depth and body profile can be customized according to drawings, 3D models, terminal samples or connector samples. Unsupported dimensions should not be assumed because installation fit depends on confirmed terminal geometry.
What material is used for this insulating boot?
The product is made from silicone rubber. Silicone is selected for flexibility, elastic recovery and temperature stability. Final compound selection should consider insulation needs, operating temperature, moisture exposure, oil contact, tear resistance and required documentation.
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 and inspection requirements. A terminal sample, connector drawing or physical boot sample helps confirm fit before batch production.
Is tooling required for custom silicone terminal insulating boots?
Tooling may be required for custom molded silicone terminal insulating boots, especially when the boot shape, opening structure or cable exit differs from existing designs. Tooling cost depends on the drawing and product structure.
Request a Custom Quote
Send your silicone terminal insulating boot drawing, terminal sample, connector drawing, 3D model or physical sample for review. Please include the 117 × 22 size reference, opening size, wall thickness, material, hardness, color, operating environment, quantity, annual demand and packaging requirements.
