GM Genuine Harmonic Balancer Bolt - Part #12557840 (Black Finish)

About This Product

This is the real deal — a genuine GM harmonic balancer bolt (part number 12557840) that's made to the exact same specs as the one that came on your vehicle from the factory. It's finished in black and is designed to securely fasten the harmonic balancer (or damper) to the end of your engine's crankshaft. That might sound like a small part, but it's super important for keeping vibrations in check and making sure everything runs smoothly. GM tests these bolts to meet strict standards for strength and reliability. Whether you're doing a repair or a rebuild, using the correct OEM bolt is the way to go for peace of mind. Fits various Chevrolet, Buick, GMC, and Cadillac models. Just make sure to check your specific year and engine to confirm compatibility. Always torque it to the manufacturer's specification when installing. A simple but critical component for keeping your engine happy!

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