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This is a generic mainspring for Rolex Caliber 2030/2035, designed for the Rolex 2030 (no-date) and 2035 (date) automatic movements. This is a brand new replacement part, not a Rolex original, measuring 1.25 × 7.5 × 0.085 mm with a 42-hour power reserve, suitable for movement repair and servicing.
Compatible Movements：Rolex Caliber 2030 / 2035
Mainspring Size：1.25 × 7.5 × 0.085 mm (height × width × thickness)
Type：Automatic mainspring (sliding attachment barrel)
Power Reserve：Approx. 42 hours
Movement Size：20mm diameter × 5.4mm height
Beat Rate：28,800 bph (4Hz)
Jewels：28
Quality：Generic replacement (non-original)
1. Is this mainspring an original Rolex genuine part?
No. This is a generic replacement, not a Rolex original, but specifically sized for 2030/2035 movements.
2. Which movements is this mainspring compatible with?
It fits Rolex 2030 (no-date) and 2035 (date) automatic movements. The 2030 powered the Lady Oyster Perpetual series, while the 2035 was used in Lady Datejust and mid-size Datejust models.
3. What tools are needed for mainspring installation?
A mainspring winder and barrel tools are required. Pay attention to the sliding attachment seating. Work should be performed by a qualified watchmaker.
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