A-3920780-AI Bolt, Head; 12MM X 1.75MM X 120MMOne New Aftermarket Replacement Cylinder Head Bolt for Cummins B Series Diesel Engines This hexagon flange head cap screw (cylinder head bolt) is a critical fastener used to clamp the cylinder head and head gasket to the engine block on Cummins B series diesel engines. Proper clamping force from these bolts maintains combustion pressure and coolant sealing integrity. Replaces Cummins OEM part number 3920780. This is the M12 x 1. 75 x 120mm bolt used
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