GM GENUINE HARMONIC BALANCER BOLT FOR HOLDEN CALAIS VT VX VY VZ LS1 5.7L V8
$32.00GM Genuine Harmonic Balancer Bolt – OE Validated Fastening for Harmonic Balancer Service
A harmonic balancer bolt, also known as a crankshaft balancer bolt or crankshaft pulley bolt, is a fastening component used at the front of the engine to secure the harmonic balancer (or pulley assembly) to the crankshaft. It plays an important role in keeping the rotating assembly properly retained during normal engine operation.
Over time, this bolt may require replacement during harmonic balancer removal, crankshaft pulley servicing, timing cover work, or general engine repair. This GM Genuine Parts harmonic balancer bolt is a practical replacement option where a genuine service part is required for correct assembly work.
Why Choose GM Genuine Harmonic Balancer Bolt?
- Designed, engineered, and tested to rigorous GM standards.
- Fastens the harmonic balancer/crankshaft pulley to the crankshaft as intended.
- Suitable for harmonic balancer, crankshaft balancer, or pulley service work.
- Steel construction is suited to high torque fastening applications.
- Practical replacement option where a genuine service bolt is required.
- Helps complete engine assembly work with the correct OE matched hardware.
Shop with MACE for GM Genuine Parts harmonic balancer bolt to complete balancer and related component service work.
This balancer bolt suits Holden vehicles fitted with LS1, L76, L98, L77 and LS3 V8 engines.
GM part number: 12557840
Contents:
- 1 X Harmonic balancer bolt

Vehicle Fitment Guide

Notes:
- The image is for illustrative purposes only.
- The accuracy of eBay's compatibility table is not always reliable. In case of any confusion, please refer to our above fitment guide to verify your vehicle or contact us for further assistance.
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Returns Policy
At Mace Engineering Group, we take great care in packaging of your products appropriately to ensure that they arrive in perfect condition. If for any reason your product is damaged during shipment, please contact us immediately to arrange for the return of your product(s) within 14 days. We will then provide you with a replacement product as soon as possible.
If you receive a product with manufacturing defect, it must be returned within 14 days. After appropriate testing, if it is found that the defect is due to misuse, willful damage, unauthorized repair or tampering with the product by the customer, return will not be accepted by Mace Engineering Group. Strictly no returns/refunds will be given due to buyer's change of mind or remorse. This is in compliance to the ACCC warranties and refunds.
Re-Stocking Fee & Refunds
If a purchased item is returned due to buyer's remorse or misorder, 10-15% re-stocking fee will be applicable at our discretion, depending on the item.
Paypal has changed its refund policy and will no longer refund the fees deducted for the original transaction, therefore, Mace Engineering Group will deduct the 2% fee while making a partial or full refund other than the restocking fee, if applicable
Postage cost is non-refundable.
Domestic Orders
- Orders typically take 1-2 business days to prepare and process prior to dispatch.
- Freight may take 1-7 business days from the date of dispatch to delivery within Australia.
- Orders can also be picked up directly from us on business days. Please email us.
- Orders are neither dispatched nor delivered on weekends.
International Orders
- Shipping will be calculated automatically based on the delivery address.
- Orders outside of Australia may take up to 10 days.
- You will be responsible for any applicable taxes and/or duties and will need to be paid upon delivery.
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Product Warranty
Mace Engineering Group products are covered by a 1 year warranty, unless otherwise specified in the ad or written agreement from Mace Engineering Group.
Terms of Warranty
Customer must return the defective item(s) first, with a full description of the problem. Appropriate tests will be conducted to determine the authenticity of the defects and claims. Once, Mace Engineering Group is satisfied, identical items(s) will be sent out to the customer.
Please ensure proper packaging of the product to prevent any damage while in transit, as goods are at owner's risk.

