What does '0.50mm undersize' mean for these bearings?

This means the bearings are manufactured to be slightly smaller than the standard size. They are intended for use when the engine's crankshaft has been machined down by 0.50mm to repair or refinish its bearing surfaces.

What is the construction of these main bearings?

These main bearings are made with a bimetal construction, featuring an aluminum base. This type of material is chosen for its good heat transfer properties and bearing surface characteristics.

Are these bearings a direct fit for my A12 engine?

Yes, these main bearings are designed to fit the A12 engine. However, they are 0.50mm undersize, so your crankshaft must also be machined to this specific undersize for proper fitment and function.

Specifications

Brand: King Engine Bearings
Part #: MB5232AM0.5
UPC: 611500240225

King Engine Bearings Nissan Datsun A12/(Size +0.50mm) Main Bearing Set

Name: King Engine Bearings Nissan Datsun A12/(Size +0.50mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-nissan-datsun-a12-size-0-50mm-main-bea-t14-770570
Price: 73.55 USD
Availability: BackOrder

$73.55

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Fits 1982-1989 Nissan Stanza. King Engine Bearings main bearing set, 0.50mm undersize, for A12 engines.

Key Features

Fits 1982-1989 Nissan Stanza, 1983-1986 Nissan Sentra, 1988-1989 Nissan Pulsar NX, and 1984-1988 Nissan 200SX.
Main bearing set for Nissan Datsun A12 engines.
Size is 0.50mm undersize, intended for use with a machined crankshaft.
Constructed with a bimetal (aluminum base) material for durability.
Supports the crankshaft within the engine block.

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About this part

Product Details

If you're rebuilding the engine in your 1982-1989 Nissan Stanza with an A12 engine, this main bearing set from King Engine Bearings is a solid option. These are the main bearings, which support the crankshaft within the engine block. This particular set is sized 0.50mm undersize, meaning it's intended for crankshafts that have been machined down by 0.50mm to true them up or account for wear.

King Engine Bearings uses a bimetal construction with an aluminum base for these bearings. This design helps manage heat and provides a good surface for the crankshaft to rotate against. They are designed as a direct replacement for the original main bearings, making installation straightforward once the crankshaft has been prepared to the correct size.