Blue Steel Mainspring per dozen

This blue steel mainspring is a precision-made component designed for reliable performance in timepieces and mechanical instruments requiring high-quality spring action. Crafted from hardened and tempered Swiss blue-finished steel, it offers excellent resilience, controlled tension, and long-lasting spring memory.

Ideal for watchmakers, horologists, clock repair technicians, and hobbyists, this mainspring provides smooth, dependable power delivery and resistance to wear and fatigue. Its blue-steel construction ensures consistent performance while maintaining resistance to corrosion and surface wear.

A professional-grade replacement or spare mainspring for fine mechanical work.

Spring thickness from 1.90mm to 3mm and length from 45cm to 80cm.