Rubber rectangular caps Custom silicone rubber tips

Rubber rectangular caps cover a projecting end with a molded cavity matched to its outside profile. Custom silicone tips can be dimensioned for the long and short sides, the engagement depth, and the corner transitions. The internal shape is central to fit, even when the visible exterior is simple.

Align the cap before fitting so the long side is not stretched across the short side of the receiving part. Check for seams, shoulders, or rounded corners beneath the cover that can stop it before it reaches the intended depth. The closed end should meet its designed position without leaving one wall pulled more tightly than the others.

Select material and hardness for the contact environment and the intended handling. If the tip also contacts a supporting surface, assess that working face and its loading separately from the cap's retention. Remove burrs before installation and inspect the inside after removal. A damaged corner can be difficult to see when the cap is installed, so replacement should preserve the exact internal profile rather than only the external dimensions.

Material options

Custom silicone compound; formulation and geometry developed together.

Hardness selection

Silicone options: 20–80 Shore A. Select material and hardness for the contact environment and the intended handling.

Custom geometry

Custom silicone tips can be dimensioned for the long and short sides, the engagement depth, and the corner transitions.

Fit evaluation

Check for seams, shoulders, or rounded corners beneath the cover that can stop it before it reaches the intended depth.

Color & OEM

Custom colors; OEM identification positioned outside closure contact surfaces.

Photos illustrate structure or material appearance only. Custom silicone tips can be dimensioned for the long and short sides, the engagement depth, and the corner transitions. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.