King SI-Series Main Bearings

4.02 out of 5 stars 85 Customer Reviews

King SI-Series main bearings are recommended for OE applications. These replacement bearings are designed for aftermarket gasoline or diesel engine rebuilding—and performance engines with factory crankshafts. The bearings have an improved crankshaft finish for reducing microscopic ferrite peaks on improperly ground or polished nodular cast iron crankshafts. King SI-Series main bearings feature improved oil clearance to reduce wear and increase engine life, which in turn reduces operating noise, vibration, and excess oil flow. Order the bearing set designed for fitment on your make and model.

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Results 1 - 25 of 29

King SI-Series Main Bearings for 2011-2017 F-150, MUSTANG - MB5734SI

Main Bearings, SI-Series, 1/2 Groove, Standard Size, Bi Metal, Ford, Coyote, Set of 5

Part Number: KGB-MB5734SI

Not Yet Reviewed

Estimated Ship Date: Today

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King SI-Series Main Bearings MB5840SI

Main Bearings, King SI-Series Main Bearings, Stock Size, Bi-Metal, Chrysler, Dodge, Sold as a Set of 5

Part Number: KGB-MB5840SI

1.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

King SI-Series Main Bearings MB5707SI

Main Bearings, King SI-Series Main Bearings, Stock Size, Bi-Metal, for Hyundai, Sold as a Set of 5

Part Number: KGB-MB5707SI

Not Yet Reviewed

Estimated Ship Date: Today

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King SI-Series Main Bearings MB4518SI

Main Bearings, King SI-Series Main Bearings, Stock Size, Bi-Metal, Chrysler, Dodge, Jeep, Ram, Sold as a Set of 4

Part Number: KGB-MB4518SI

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB5840SI0.25

Main Bearings, King SI-Series Main Bearings, .010 in., .25 mm Crankshaft Undersize, Bi-Metal, Chrysler, Dodge, Sold as a Set of 5

Part Number: KGB-MB5840SI025

Not Yet Reviewed

Estimated Ship Date: Today

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King SI-Series Main Bearings for 2011-2017 F-150, MUSTANG - MB5734SI0.5

Main Bearings, SI-Series, 1/2 Groove, 0.50mm Crankshaft Undersize, Bi Metal, Ford, Coyote, Set of 5

Part Number: KGB-MB5734SI05

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings for 2011-2017 F-150, MUSTANG - MB5734SI0.25

Main Bearings, SI-Series, 1/2 Groove, 0.25mm Crankshaft Undersize, Bi Metal, Ford, Coyote, Set of 5

Part Number: KGB-MB5734SI025

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB5745SI

Main Bearings, King SI-Series Main Bearings, Stock Size, Bi-Metal, Subaru, Sold as a Set of 5

Part Number: KGB-MB5745SI

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB4524SI0.5

Main Bearings, King SI-Series Main Bearings, .020 in., .50 mm Crankshaft Undersize, Bi-Metal, for Infiniti, for Nissan, Sold as a Set of 4

Part Number: KGB-MB4524SI05

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB4518SI0.25

Main Bearings, King SI-Series Main Bearings, .010 in., .25 mm Crankshaft Undersize, Bi-Metal, Chrysler, Dodge, Jeep, Ram, Sold as a Set of 4

Part Number: KGB-MB4518SI025

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB5707SI0.25

Main Bearings, King SI-Series Main Bearings, .010 in., .25 mm Crankshaft Undersize, Bi-Metal, for Hyundai, Sold as a Set of 5

Part Number: KGB-MB5707SI025

Not Yet Reviewed

Estimated Ship Date: Today

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Estimated Ship Date: Today

King SI-Series Main Bearings MB5840SI0.5

Main Bearings, King SI-Series Main Bearings, .020 in., .50 mm Crankshaft Undersize, Bi-Metal, Chrysler, Dodge, Sold as a Set of 5

Part Number: KGB-MB5840SI05

Not Yet Reviewed

Estimated Ship Date: Today

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Estimated Ship Date: Today

King SI-Series Main Bearings MB5745SI0.25

Main Bearings, King SI-Series Main Bearings, .010 in., .25 mm Crankshaft Undersize, Bi-Metal, Subaru, Sold as a Set of 5

Part Number: KGB-MB5745SI025

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB4524SI0.25

Main Bearings, King SI-Series Main Bearings, .010 in., .25 mm Crankshaft Undersize, Bi-Metal, for Infiniti, for Nissan, Sold as a Set of 4

Part Number: KGB-MB4524SI025

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB4525SI0.25

Main Bearings, King SI-Series Main Bearings, .010 in., .25 mm Crankshaft Undersize, Bi-Metal, Lexus, Lotus, Toyota, Sold as a Set of 4

Part Number: KGB-MB4525SI025

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB4525SI0.75

Main Bearings, King SI-Series Main Bearings, .030 in., .75 mm Crankshaft Undersize, Bi-Metal, Lexus, Lotus, Toyota, Sold as a Set of 4

Part Number: KGB-MB4525SI075

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB4518SI0.5

Main Bearings, King SI-Series Main Bearings, .020 in., .50 mm Crankshaft Undersize, Bi-Metal, Chrysler, Dodge, Jeep, Ram, Sold as a Set of 4

Part Number: KGB-MB4518SI05

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB4525SI0.5

Main Bearings, King SI-Series Main Bearings, .020 in., .50 mm Crankshaft Undersize, Bi-Metal, Lexus, Lotus, Toyota, Sold as a Set of 4

Part Number: KGB-MB4525SI05

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB5770SI0.25

Main Bearings, King SI-Series Main Bearings, .010 in., .25 mm Crankshaft Undersize, Bi-Metal, for Nissan, Sold as a Set of 5

Part Number: KGB-MB5770SI025

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB5770SI0.5

Main Bearings, King SI-Series Main Bearings, .020 in., .50 mm Crankshaft Undersize, Bi-Metal, for Nissan, Sold as a Set of 5

Part Number: KGB-MB5770SI05

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB5770SI0.75

Main Bearings, King SI-Series Main Bearings, .030 in., .75 mm Crankshaft Undersize, Bi-Metal, for Nissan, Sold as a Set of 5

Part Number: KGB-MB5770SI075

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB5781SI0.25

Crankshaft Main Bearings set, Nissan MR18DE, MR20DE

Part Number: KGB-MB5781SI025

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB5707SI0.5

Main Bearings, King SI-Series Main Bearings, .020 in., .50 mm Crankshaft Undersize, Bi-Metal, for Hyundai, Sold as a Set of 5

Part Number: KGB-MB5707SI05

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB5770SI

Main Bearings, King SI-Series Main Bearings, Stock Size, Bi-Metal, for Nissan, Sold as a Set of 5

Part Number: KGB-MB5770SI

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB5707SI0.75

Main Bearings, King SI-Series Main Bearings, .030 in., .75 mm Crankshaft Undersize, Bi-Metal, for Hyundai, Sold as a Set of 5

Part Number: KGB-MB5707SI075

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

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