What does the +0.25mm size mean for these main bearings?

The +0.25mm designation means these bearings are designed for a crankshaft that has been machined down by 0.25mm. This is a common practice during engine rebuilding to achieve proper clearances when the original crankshaft journals have been worn or resurfaced.

What is PMaxBlack technology?

PMaxBlack is a technology developed by King Engine Bearings that enhances the load capacity of the bearings. This makes them suitable for performance applications where the engine may experience higher stresses than a stock setup.

Do these bearings come with installation instructions?

While these bearings are designed for a direct fit on compatible engines, it is always recommended to refer to the vehicle manufacturer's service manual or King Engine Bearings' installation guidelines for proper torque specifications and procedures.

Specifications

Brand: King Engine Bearings
Part #: MB5595XP0.25
UPC: 611500584053

King Engine Bearings Nissan KA-24DE Performance Main Bearing Set - Size +0.25mm

Name: King Engine Bearings Nissan KA-24DE Performance Main Bearing Set - Size +0.25mm
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-nissan-ka-24de-performance-main-bearin-t14-45745
Price: 130.46 USD
Availability: BackOrder

$130.46

On Backorder — Expected to ship by Sep 16, 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 Nissan KA-24DE Performance Main Bearing Set - Size +0.25mm. Improves load capacity for performance builds.

Key Features

Fits 1989-1998 Nissan 240SX, 1993-2001 Nissan Altima, and many other Nissan models with the KA24DE engine.
Main bearing set is +0.25mm undersize for use with a machined crankshaft.
Features PMaxBlack technology for superior load capacity.
Includes Radialock design for optimal crush height.
Constructed with a tri-metal copper-based material.

⚠️ 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

If you're rebuilding the bottom end of your Nissan KA24DE engine, especially for a performance application, getting the main bearings right is crucial. These performance main bearings from King Engine Bearings are designed to handle the extra stress that comes with a modified engine. They are a +0.25mm undersize set, meaning they are intended for use with a crankshaft that has been machined down by 0.25mm to ensure a proper fit and clearance.

King specializes in bearings, and this set uses a tri-metal copper-based material for a solid foundation. They feature PMaxBlack technology, which helps them handle higher loads, a common requirement when you're pushing an engine harder. The Radialock design helps maintain optimal crush height during installation, which is key for proper oil pressure and bearing function. These bearings are well-built and aim to provide reliable performance for your engine build.

This set fits a range of Nissan vehicles equipped with the KA24DE engine, including popular models like the 240SX, Frontier, and Altima. Always ensure your crankshaft has been properly machined to the +0.25mm undersize specification before installing these bearings.