Rubber Grommets
Precision compression molded rubber grommets designed to protect wiring harnesses, fluid tubes, and electrical conduits passing through sharp metal apertures. Provides air/water sealing, cable strain relief, and acoustic firewall isolation.
Types & Configurations of Rubber Grommets
Standard Open Wiring Grommets
Symmetrical annular groove grommets snapping into sheet metal to insulate passing electrical cables.
Blind & Semi-Blind Membrane Grommets
Solid central web that can be punctured to create an airtight seal around custom cable bundles.
Multi-Hole Cable Pass-Through Grommets
Single grommet body with multiple discrete apertures for automotive sensor harness leads.
Stepped Cone Firewall Grommets
Conical tear-off steps accommodating cable bundle diameters from 6mm to 35mm.
Sleeved Strain Relief Cable Grommets
Extended tubular tail protecting cables from sharp bending and fatigue failure.
Key Industrial Applications
Specifications & Technical Details
Rubber Grommets can be precision-manufactured in custom dimensions, wall thicknesses, cross-sections, and durometers to match your exact application specifications. Below are typical engineering cross-section drawings and technical parameters for reference.
Typical Dimension Drawings & Blueprint Cross-Sections
Technical Specifications
| Parameter | Specification / Options |
|---|---|
| Panel Hole Diameters | 3.0mm up to 100mm sheet metal hole sizes |
| Panel Thickness Range | 0.8mm up to 8.0mm panel thickness capability |
| Elastomer Options | EPDM (weatherproof), Nitrile (oil resistant), Neoprene (flame retardant), Silicone |
| Flammability Standard | UL 94 HB and UL 94 V-0 flame-retardant grades available |
| Dielectric Strength | 18 kV/mm to 24 kV/mm electrical insulation |
| Hardness Range | 40A to 70A Shore A for easy push-fit insertion and firm retention |
| Operating Temp | -40°C to +125°C |
Material Selection & Properties
We offer specialized compound formulations tailored to chemical media, thermal extremes, static deflection, and dynamic fatigue requirements. The best material depends on your operating environment and required service life.
| Material / Polymer | Key Engineering Properties | Recommended Applications & Considerations |
|---|---|---|
| Natural Rubber (NR) | High tensile strength & dynamic resilience | General industrial mounts, automotive bushings |
| Nitrile (NBR) | Superior petroleum oil, fuel & grease resistance | Hydraulic cylinder seals, oil gaskets, fuel lines |
| EPDM | Outstanding weather, ozone, UV & steam stability | Outdoor enclosures, HVAC seals, automotive weatherstrips |
| Neoprene (CR) | Moderate oil resistance, flame retardant, ozone stable | Marine gaskets, vibration pads, railway seals |
| Silicone (VMQ) | Extreme thermal range (-60°C to +250°C), food grade | Food processing, pharmaceutical, high-heat gaskets |
| Viton® (FKM) | High chemical, acid & high temp resistance up to 220°C | Aerospace fuel seals, chemical processing pumps |
Important Engineering Guidance
The above properties are general characteristics. Final material selection depends on your specific application, operating conditions, load requirements, media compatibility, and service temperature. Please contact our polymer engineering team for tailored compounding guidance on Rubber Grommets.
Production Batch Gallery
Actual production batch examples of Rubber Grommets manufactured for OEM, automotive, railway, and heavy engineering clients. We manufacture standard catalogue sizes as well as bespoke custom geometries from your CAD models or physical samples.
Request an Engineering Quote
Share your required dimensions, polymer grade, or 2D/3D drawings for immediate engineering review and quote.