Custom molded protective silicone rubber bushing

A protective silicone rubber bushing separates a mating part from the hard surface of a receiving hole or housing. Its wall creates a compliant interface, while any shoulders or flanges in the chosen design help establish the installed position. The protective function depends on covering the area that would otherwise experience direct contact.

Check the bore, wall thickness and overall length together. A bushing that is too short can leave an exposed edge, while one that projects too far may interfere with an adjacent component. The internal opening should allow the intended fit without excessive squeeze on the contained part.

Seat the bushing without twisting or folding its wall. A smooth receiving edge helps preserve the rubber during insertion. If movement is expected, assess where that movement takes place and inspect the bore for wear during maintenance. The component should not be assigned a rotating-bearing duty or electrical insulation rating merely because it forms a rubber barrier around the part passing through it.

Material options

Silicone. Custom formulation and color for the intended contact conditions.

Hardness selection

Silicone: 20–80 Shore A. Choose flexibility with the protective bushing length and wall section, avoiding a grade that allows its exposed end to fold into adjacent parts.

Custom dimensions

Check the bore, wall thickness and overall length together.

Fit & assembly

The internal opening should allow the intended fit without excessive squeeze on the contained part.

Use & inspection

If movement is expected, assess where that movement takes place and inspect the bore for wear during maintenance.

Photos illustrate structure or material only. A protective silicone rubber bushing separates a mating part from the hard surface of a receiving hole or housing. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.