M12x1.25 Flange Nut - GY6 125/150cc Clutch & Flywheel

This M12x1.25 Flange Nut is a high-strength OEM replacement specifically designed for the GY6 engine platform. Featuring a smooth integrated flange base, this nut provides a wider surface area for more consistent clamping force, making it essential for securing high-vibration rotating components like the clutch bell and flywheel. Primary Applications: Clutch Assembly: Secures the clutch bell/assembly to the transmission output shaft. Flywheel/Magneto: Holds the flywheel in place on the crankshaft (located between the flywheel and cooling fan). Technical Specifications: Thread Size: M12 x 1.25 (Fine Thread) Socket Size: 17mm Outer Diameter (Base): 23.5mm Total Height: 8.85mm Material: Zinc-plated Steel Engine Compatibility: Designed for 4-stroke Chinese engines (GY6), including 125cc, 150cc, and 169cc variants. Fits engines with the following codes: 157QMJ / 1P57QMJ 152QMI / 1P52QMI 161QMK / 1P61QMK Other: BN157QMJ, JJ157QMJ, and generic QMI/QMJ clones. 157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes: 157QMJ 161QMK 152QMI 1P61QMK YN1P57QMJ 1P52FMI 154FMI JJ157QMJ 1P57QMJ BN157QMJ BN161QMK-A Other QMJ, QMK, and QMI models Don't see your engine listed? If the engine code includes "QM" or "FM", this product is compatible with your vehicle. Tech Tip: These nuts are often "one-time use" in high-performance applications as the threads can stretch under the high torque required (approx 40-45 ft-lbs). Always use a drop of medium-strength thread locker to ensure the nut does not back off during operation. About Scooterworks: Since 1989, Scooterworks has been the premier source for specialized scooter hardware. We stock genuine and high-quality aftermarket components for brands like Genuine, Wolf, TaoTao, and Vespa. Original Parts For Scooters SKU 175-33