Genuine Spring Heavy B3103804000, designed for the Juki MO-816 sewing machine. This original Juki component is an essential part of the machine’s tension and mechanism system, providing controlled pressure and reliable support for smooth and consistent operation during high-speed sewing.

Made from high-quality, durable spring steel, this heavy-duty spring is built to withstand continuous industrial use while maintaining excellent elasticity and long service life. It is the perfect replacement for worn or weakened springs, helping restore proper machine function and stability.

Key Features:

Genuine Juki part for exact fit and compatibility
Designed for Juki MO-816 sewing machine
Provides strong and stable spring tension support
High-quality spring steel for durability and long life
Helps ensure smooth and consistent machine operation
Easy to install and replace

Perfect for industrial and professional sewing environments, this heavy spring helps maintain reliable performance and optimal machine stability for high-quality stitching results.