Automatic Mainsprings for Wristwatches

Automatic mainsprings for wristwatches provide a highly resilient, corrosion-resistant power source for modern automatic movements. The special material ensures constant torque delivery, high elasticity and a particularly long service life - even under intensive stress from the rotor winding mechanism. The variants available from Boley are equipped with a riveted drag spring, which ensures smooth power flow in the automatic system and enables clean winding of the barrel.

• Spring band for maximum stability and low material fatigue
• Riveted drag spring for reliable function in automatic winding
• Precisely manufactured dimensions for a perfect fit in many calibres
• Ideal for revisions of ETA, Sellita, Miyota and other automatic movements