Mainspring for American Wall Clock – Loop End (3/4″ x 0.018″ x 170″)

31 Day Wall Clock Mainspring 19 X 0.46 X 4320Mm – Loop end

This 31 day wall clock mainspring 19 x 0.46 x 4320mm is a replacement power spring for compatible 31-day American mechanical wall clocks. It uses a loop end and measures 19mm / 3/4 inch wide, 0.46mm / 0.018 inch thick and 4320mm / 170 inches long.

The mainspring stores the energy that drives a mechanical clock after winding. Correct width, thickness, length and end style are essential because these dimensions affect whether the spring fits the barrel or movement and how much power it delivers.

This replacement is intended for repair and restoration where the original spring is broken, weakened or otherwise unsuitable for reuse. It is particularly useful for clockmakers and experienced restorers who can compare the original spring dimensions before installation.

Specifications

• Width: 19mm / 3/4 inch
• Thickness: 0.46mm / 0.018 inch
• Length: 4320mm / 170 inches
• End type: Loop end
• Application: Compatible 31-day american mechanical wall clocks

Important

Please measure the original mainspring carefully before ordering. Width, thickness, length and end style must all be compatible. Mainsprings are under significant tension and should be installed with appropriate clock-repair tools and experience.

Explore More Clock Mainsprings

Our Mainsprings range includes loop-end and hole-end replacement mainsprings in a variety of widths, thicknesses and lengths for antique, vintage and mechanical clock repair and restoration.