ACDelco Crankshaft Bearing Cap Bolt

The ACDelco Crankshaft Bearing Cap Bolt (also called a main bearing cap bolt or main cap bolt) secures the crankshaft main bearing caps to the engine block. It keeps the crankshaft held in its bearings so it can rotate smoothly under load.

Key Features:

• Clamps the main bearing cap firmly to the engine block
• Helps keep bearing clearances and crankshaft alignment consistent
• Backed by the ACDelco name, a long-established GM parts brand
• Suited to engine rebuilds and main bearing or crankshaft service

Crankshaft bearing cap bolts are critical fasteners in the engine's rotating assembly. Many are torque-to-yield designs, so follow the vehicle manufacturer's service procedure for torque specifications and for whether to replace the bolts.