Rubber grommet gaskets fit into or around mounting holes where a flat gasket cannot provide enough location or edge support. The molded groove and flange hold the part in position while the rubber body cushions the joint and helps limit vibration, dust and moisture around the opening. For flat flange and housing seals, see our custom molded rubber gaskets.
A grommet gasket sits in the opening instead of flat between two mating faces. The groove grips the panel, the flange covers the edge, and the rubber body cushions the mounted part. With the right fit, it can also limit dust and moisture around the hole.
Groove width is matched to the panel or housing thickness so the gasket stays located during assembly.
The flange extends beyond the hole edge to provide a broader contact area for support and local sealing.
The inner hole can be sized around a bolt, stud, tube, fitting, or other part passing through the mount.
Rubber hardness and section thickness are selected around the clamping or compression load at the mounting point.
The molded rubber section separates rigid parts and can reduce vibration, noise, and direct surface contact.
Groove, flange, inner hole, lip, and overall height can be molded to the actual opening and mating geometry.
The mounting opening and panel thickness define the basic fit. Flange size, inner hole, overall height, hardness, and compression are then checked against the assembled part.
| Mounting Dimensions to Confirm | |
|---|---|
| Mounting Opening | Hole size and shape from drawing or mating part |
| Groove & Panel Fit | Groove width matched to panel or housing thickness |
| Flange & Overall Height | Defined by support area, installation space, and compression |
Send the opening size, panel thickness, inserted-part dimensions, and available installation space. We review the groove, flange, inner hole, and material before tooling.
Mounting Dimensions
Fit Check Before Batch
These molded parts are used where the rubber needs to locate around an opening, support the inserted component, and separate it from a rigid panel or housing.
Fits around bolts or studs where the rubber section cushions the joint and separates rigid surfaces.
Retained around holes in metal or molded housings where the edge needs a shaped rubber interface.
Supports rigid tubes, fittings, or similar parts passing through a mounting hole while reducing edge contact.
Used at compact mounting points where a molded rubber section helps reduce vibration transfer and contact noise.
Suitable when a component must be located and cushioned directly at a round or shaped panel opening.
Grommet gasket tooling is developed from the mounting geometry, not from a generic gasket size. Critical fit dimensions are checked before samples move into batch production.
We confirm the opening, panel thickness, inner hole, groove, flange, and available installation space from your drawing or sample.
The mold is cut to the approved groove and flange profile, with compound and hardness selected for the actual mounting conditions.
Initial samples can be checked against the target opening or mating dimensions to verify retention, clearance, and compression.
Critical dimensions, molding condition, and agreed appearance requirements are inspected to the project specification before shipment.
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