50mm rubber grommet silicone wire grommet

The 50mm rubber grommet range provides several cable passage choices for a 50 mm panel hole. The listed parts share a 55 mm outside diameter, while their inside diameters are 36, 40 or 45 mm. This distinction matters when a panel opening is already fixed but the cable bundle has not yet been finalized.

The larger bore leaves more clear space through the center; the smaller bore provides a different amount of rubber between the passage and the mounting area. Choose the bore around the actual cable arrangement, including assembly clearance, rather than assuming that the nominal 50 mm size describes the usable opening.

For a panel already cut to 50 mm, these alternatives allow the passage to change without changing the nominal mounting hole. They still require an independent cable fit check. A connector wider than 36 mm may change the assembly sequence for the smallest bore, whereas the cable behind that connector might pass easily. Review the largest item that must cross the entry, not just the cable diameter after installation.

Each bore group includes versions for panel thicknesses of 1, 2, 4, 6 and 8 mm. Listed overall thicknesses increase from 8 to 15 mm across those options. For example, the RG55-40-50-4 combines a 40 mm inside diameter with a 50 mm panel hole and a 4 mm panel thickness. Keep all of those dimensions together when identifying a part.

Material options include silicone, EPDM, FKM, nitrile, HNBR, neoprene and SBR. Select the compound according to the environment at the entry; a common shape does not make the materials interchangeable.

Seat the groove fully before passing a bulky connector through it. If the cable must bend immediately beside the panel, provide support so the bend does not continually pull the rubber lip out of its seating position.

Material options

Custom silicone or rubber formulation, with dimensions and color adapted to the mating component.

Hardness range

Silicone: 20–80 Shore A; rubber: 30–90 Shore A. Assess the grade against this fit requirement: If the cable must bend immediately beside the panel, provide support so the bend does not continually pull the rubber lip out of its seating position.

Custom profile & fit

Choose the bore around the actual cable arrangement, including assembly clearance, rather than assuming that the nominal 50 mm size describes the usable opening.

Assembly considerations

Review the largest item that must cross the entry, not just the cable diameter after installation.

Design check

Select the compound according to the environment at the entry; a common shape does not make the materials interchangeable.

Photos illustrate structure or material only. For example, the RG55-40-50-4 combines a 40 mm inside diameter with a 50 mm panel hole and a 4 mm panel thickness. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.