Genuine Spring Heavy B3103804000 for Juki MO-804 Sewing Machine

Ensure stable and balanced thread tension with this genuine Juki Heavy Tension Spring (Part No. B3103804000), designed for the Juki MO-804 sewing machine. This original OEM component is part of the thread tension assembly and provides stronger pressure control for heavier fabrics and thicker thread applications.

The heavy tension spring works together with the tension discs to maintain consistent thread control, helping deliver strong, even stitches, reduced slippage, and improved stitch stability during high-speed industrial sewing. It is commonly used in Juki MO series overlock machines as part of the standard tension system assembly.

Manufactured to Juki’s strict factory standards, this spring ensures a precise fit, strong elasticity, and long-lasting durability, making it ideal for continuous industrial use.

Key Features:
Original Juki Part (OEM) – Ensures perfect compatibility and performance
Part Number: B3103804000
Compatible with: Juki MO-804 sewing machine
Function: Provides heavy tension control for stable stitch formation
Improves Stitch Quality: Ideal for thicker threads and heavy materials
Durable Spring Steel: Built for long-term industrial use
Essential Tension Component: Supports consistent sewing performance

Replace worn or weak tension springs with this genuine heavy-duty part to maintain proper thread control and keep your machine running efficiently under demanding conditions.