Rubber Wire Grommets

Custom Rubber Wire Grommets Solution

When a wire or cable passes through a metal panel, the raw cut edge will saw through the insulation over time — vibration works the cable against the edge until the jacket wears through and the wire shorts or grounds out. A rubber wire grommet lines that edge, absorbs the vibration, and keeps moisture and debris out of the enclosure.

Flexiparts molds each grommet to your panel cutout, cable count, and install method — we don’t work from a fixed size chart. Send your panel drawing or a sample and we’ll confirm fit before tooling.

Custom different types of electrical wire grommets:

• electrical wire grommets
• cord hole grommet
• wire wall grommet
• wire harness grommets
• cord hole cover
• firewall wire grommet
• waterproof wire grommet
• junction box grommet
• bulkhead grommet rubber
• white wire grommet

Choosing the Right Grommet Design

Closed vs. split. A closed-loop grommet gives the tightest seal but requires threading the cable through before termination — best for new builds. A split or slit design opens along one side so it can be installed around a cable that’s already terminated or wired in place — the tradeoff is a slightly weaker seal at the seam, which we can offset with an interlocking or overlapping cut.

Single cable vs. bundle. A single-bore grommet seals one cable tightly. For wire harnesses or multiple cables through one panel opening, we mold multi-bore or bundle grommets sized to your cable count and diameters, so each cable gets individual support instead of being packed loosely into one oversized hole.

Flanged vs. flush. A flanged grommet locks into the panel groove and sits proud on both sides — good where the panel is thin or the fit needs to hold under repeated flexing. A flush grommet sits level with the panel face, used where clearance on one side is tight.

Sealing Level. Tell us the environment and we’ll size the material and groove interference accordingly — dust-only protection needs less compression than a splash-rated or fully submerged application. Getting this wrong either strains the cable jacket (too tight) or lets moisture track in along the seam (too loose).

Common Materials

Material selection depends on the operating environment, temperature, chemical exposure, and sealing requirements. If you’re unsure, simply describe your application and we’ll recommend the most suitable compound.

• EPDM — weather and ozone resistance for outdoor or automotive runs
• NBR — oil and fuel resistance for engine bay or industrial wiring
• Silicone — wide temperature range, stays flexible in cold environments
• CR (Neoprene) — general-purpose, good abrasion and weather resistance
• FKM — chemical and high-heat resistance for harsh environments

Information Needed for Custom Wire Grommets

To optimize design and manufacture a custom wire grommet, we typically need:

• Panel thickness
• Panel cutout diameter or shape
• Cable diameters
• Number of cables
• Required sealing level
• Operating temperature
• Exposure to oil, UV, or chemicals
• Preferred material