Case-back gaskets

Find in this category every watch case-back gasket for watchmaker repair. These gaskets ensure water resistance between the case-back and the middle case. They must be replaced every time the watch is opened to preserve the water resistance rating.

Features

• Available types: O-ring, flat gasket, silicone gasket, rigid red gasket.
• Diameters: a broad range covering most wristwatches.
• Thicknesses: matched to the depth of each seat.
• Materials: nitrile, silicone, rigid polymer.

How to choose your gasket

• Measure the inner diameter of the case-back seat with a calliper.
• Order a gasket roughly 0.1 mm smaller to ensure proper compression.
• Check the depth of the seat to pick the correct thickness.
• Prefer silicone for screw-down case-backs, nitrile O-rings for snap-back cases.

See our guide replace a case-back gasket for the full procedure.

FAQ

What is the difference between O-ring and flat?

The O-ring has a circular section and offers better compression. The flat gasket fits shallow snap-back cases.

Should these gaskets be lubricated?

Yes, with silicone grease to preserve their flexibility and sealing.