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This is a generic bezel/crystal gasket for the Rolex Lady‑Datejust 179174, measuring 21.3mm and made of nylon as an O‑ring. It creates a watertight seal between the crystal and the bezel, helping the watch maintain its original water resistance. When the original gasket has hardened, cracked, or failed, this aftermarket part offers watchmakers a cost‑effective replacement solution.
Material: Nylon – offers excellent wear resistance, oil resistance and ageing resistance, outperforming ordinary rubber.
Dimension: 21.3 mm (likely inner or outer diameter – compare with the original before installation).
Compatible model: Rolex Lady‑Datejust 179174 (26mm case, Caliber 2235 movement).
Function: Fits between the sapphire crystal and the bezel (or case); compresses to fill the gap and prevents moisture and dust from entering the movement.
Aftermarket advantage: Significantly lower cost than genuine parts, easy to source for repair.
Q1: Which is better, nylon or rubber gaskets?
A: Nylon offers better ageing and oil resistance but is less elastic. Rubber is more elastic but ages faster. Rolex uses nylon gaskets in some references; this product follows the original specification.
Q2: Can I install the gasket without silicone grease?
A: It is highly recommended. An ultra‑thin layer of waterproof silicone grease helps the gasket slide into place without twisting and improves the seal. Skipping it may make installation difficult or cause leakage.
Q3: Can this gasket be used on other Rolex references?
A: Probably not. Different Rolex models use different gasket sizes and cross‑section profiles. Use only for the 179174 or after verifying dimensional compatibility.
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