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Custom Plastic Parts
Custom Rubber Parts
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Custom Car & Auto Rubber Grommets
Automotive Rubber Grommets for Car Firewall Wiring Protection
protect cables, wires, and hoses where they pass through metal panels, firewalls, and body sections. They prevent abrasion from sharp panel edges, seal against engine heat, oil, moisture, and road debris, and reduce vibration transfer between the cable and the vehicle body. Every wiring harness in a modern vehicle passes through multiple grommets — from the engine bay firewall to door frames, floor panels, and trunk bulkheads.
Common Materials for Automotive Rubber Grommets
- EPDM
- NBR
- Silicone
- NR
- CR
- FKM
- SBR
Where Auto Rubber Grommets Are Used
- Firewall wiring harness pass-through — main harness from engine bay to cabin
- Door frame and body panel cable routing — power windows, locks, speakers
- Floor panel and transmission tunnel — gear selector cables, fuel and brake lines
- Engine bay grommets — fuel injector wiring, sensor cables, coolant hose routing
- Trunk and rear quarter panel — tail light and sensor wiring
- EV battery pack enclosures — high-voltage cable sealing and vibration isolation
Flexiparts Custom Manufacturing Capability
As a factory with in-house mold tooling, we handle the full process from design review to mass production. There is no middleman — our engineers work directly with your team to verify dimensions, select the right compound for your environment, and produce T1 samples for approval before any production run starts. We support both prototype quantities and long-term volume supply, with consistent part quality managed under ISO process controls.
Customizable parameters include: inner bore diameter, panel hole OD, groove width and depth, flange thickness, lip geometry, Shore hardness (A40–A80), color, and material compound. Flame-retardant and low-smoke formulations are available on request.
FAQ
Can you manufacture grommets to match OEM dimensions?
Yes. We work from your 2D/3D drawings, sample parts, or even worn originals. Our tooling team builds molds to your exact specifications, and T1 samples are provided for dimensional verification before production begins.
2. Which material is best for engine bay applications?
NBR is the standard choice where oil and fuel exposure is the primary concern. For high-heat zones close to the exhaust or turbo, silicone handles up to 200°C. FKM (Viton) is recommended for transmission and fuel injection environments with combined heat and chemical exposure.
3. Do your grommets meet automotive flame-retardant standards?
Yes. We supply UL94 V-0 and FMVSS 302 compliant compounds for wiring harness and interior applications where flame-retardant certification is required. Other certifications can be discussed based on your project needs.
4. What is your minimum order quantity?
We support prototype quantities for mold validation with no fixed MOQ on samples. Production MOQ depends on part complexity and mold type. Contact us with your drawings for a specific quote.
How To Work with Us
The key to great custom parts is collaboration. As a custom molding manufacturer, our engineers will stay connected with you throughout the process, and deliver products that meet your expectations.
- Send us your 2D/3D files or product concept, for an accurate quote, please send us materials, order quantity, and surface requirements.
- We review your design and send you a clear cost within 24 hours.
- Our tooling team builds the mold to your specifications, then send you T1 samples for confirmation.
- Once the sample is approved, we run full production under strict quality control
- Your finished parts are packaged securely and shipped to your location on time.
Related Products
- More Rubber Grommet
Start Your Project!
Need custom rubber, plastic, or polyurethane parts? FlexiParts offers prototyping and on-demand, low to high-volume production of high-quality, durable components. Whatever your needs, we deliver reliable custom parts on time and within budget. Start your project with us today!
