Genuine Juki Thread Tension Spring (Part #131-38656). This "Blue Complete" assembly is specifically calibrated to provide the precise tension required for professional-grade stitching at high speeds.

Calibrated Tension Control
In a multi-thread system, each thread path requires a specific spring weight to pull the stitch correctly. The 131-38656 Blue spring is factory-tuned to Juki’s exact specifications, ensuring that the "Blue" thread path (often associated with specific needle or looper threads) remains perfectly balanced.

Why Choose the Genuine 131-38656 Spring?
Color-Coded Accuracy: The "Blue" designation ensures you are using the correct spring weight for the intended thread path, preventing tension fluctuations.

High-Tensile Memory: Manufactured from premium spring steel that retains its original tension and shape, even after millions of high-speed cycles.

Polished Coil Finish: Designed to compress smoothly without "catching" or binding, providing a fluid thread response that prevents breakage.

OEM Reliability: Genuine Juki springs offer a level of consistency that generic "one-size-fits-all" springs cannot match.