Product Description

Motorized Upper Thread Tension Assembly, engineered for advanced sewing and embroidery machines. This unit combines a high-accuracy stepper motor with a precision-cut gear system to deliver smooth, automated tension adjustments across a wide range of stitches and fabrics.

Constructed with a durable molded mounting frame, integrated electronics, and a responsive tension-disc mechanism, this assembly ensures optimal upper-thread performance—even at high stitching speeds. The attached wiring harness provides reliable communication with the machine’s control board, enabling real-time adjustments and dependable stitch quality.

Perfect as a direct replacement for worn or non-responsive tension units, this assembly restores factory-level tension accuracy and smooth operation.

Key Features

• 17D30-12), used for precise rotational or positional control.

• Gear system with:

  • Large black drive gear

  • Smaller internal gears for controlled tension adjustment

• Thread disc / tension plate:

  • Metal disc assembly typically used to apply upper thread tension.

• Circuit board + sensor:

  • Small green PCB indicating electronic feedback or position sensing.

• Mounting bracket:

  • Black molded structure for attaching the assembly inside the machine.

• Wiring harness:

  • Multi-wire connector for power and signal control.