What does the STDX size mean for these bearings?

The STDX designation indicates that this bearing set is 0.040 inch undersize. This is important to consider when matching bearings to your crankshaft, especially if the crankshaft has been machined.

What is the PMaxBlack overlay and why is it important?

PMaxBlack is a proprietary overlay developed by King Engine Bearings. It's designed to provide superior load capacity, which helps protect the bearings from wear and damage under high stress conditions within the engine.

What is the Radialock feature?

Radialock is a design feature that helps ensure the bearing achieves optimal crush height when installed. This proper crush is essential for the bearing to seat correctly and maintain consistent oil clearance.

Specifications

Brand: King Engine Bearings
Part #: MB5304XPSTDX
UPC: 611500542947

King Engine Bearings Mazda B6/B6-T/ZM/B3/B5 Main Bearing Set - Size STDX

Name: King Engine Bearings Mazda B6/B6-T/ZM/B3/B5 Main Bearing Set - Size STDX
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-mazda-b6-b6-t-zm-b3-b5-main-bearing-se-t14-4326087
Price: 109.06 USD
Availability: BackOrder

$109.06

On Backorder — Expected to ship by May 17, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

King Engine Bearings Mazda B6/B6-T/ZM/B3/B5 Main Bearing Set - Size STDX. Features PMaxBlack for superior load capacity.

Key Features

Fits many Mazda, Ford, Kia, and Mercury vehicles.
Features PMaxBlack overlay for superior load capacity.
Utilizes a tri-metal copper-based material for durability.
Includes Radialock feature for optimal crush height.
This is the STDX size, which is 0.040 inch undersize.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

The PMaxBlack overlay on these main bearings is a key feature, offering a superior load capacity that's crucial for keeping your engine running smoothly. King Engine Bearings, a company focused solely on making top-notch bearings since 1960, uses a tri-metal copper-based material for a solid foundation. This set is sized STDX, meaning it's 0.040 inch undersize, which is important to note if you're rebuilding or machining your crankshaft.

These bearings are designed to fit a range of vehicles, including popular models like the Mazda Miata, Mazda Protege, and Ford Escort. The Radialock feature helps achieve optimal crush height during installation, ensuring the bearing stays securely in place. If you're working on an engine that uses the B6, B6-T, ZM, B3, or B5 engine family, this set is a well-built option to consider for your rebuild.