30-Hour Mainspring for Mechanical Clocks – Loop End (5/16″ x 0.015″ x 42″)

Keep your 30-hour mechanical clock running smoothly with this high-quality loop end mainspring, designed for dependable power and durability. Measuring 5/16 inch (8 mm) wide, 0.015 inch (0.38 mm) thick, and 42 inches (1067 mm) long, it’s an excellent fit for a wide range of vintage and antique clocks that require shorter-duration winding cycles.

Key Features:

• Ideal for 30-Hour Mechanical Clocks

• Loop End for easy and secure installation

• Dimensions: 5/16″ (8 mm) width x 0.015″ (0.38 mm) thickness x 42″ (1067 mm) length

• Made from tempered spring steel for reliable tension and long-term performance

• Great for restorations, repairs, and maintenance of vintage timepieces

Perfect for clockmakers, collectors, or hobbyists restoring 30-hour wall or shelf clocks to working condition.