SCREW 10-82641030 PAF25-05050019

Function and technical context

This M8 x 30 mm metric screw is a critical fastening element in the structural architecture of marine petrol engines, responsible for keeping mechanical components subjected to constant vibrations and torsional stresses under controlled tension. It works on fastening systems for elements of the engine block, cylinder head, crankcase and transmission assemblies where rigidity and uniform tightening are essential to guarantee clearance-free operation. Its breakage or progressive loosening compromises the structural integrity of the engine, generating abnormal vibrations, loss of tightness in critical joints and potential entry of water or contamination into internal cavities.

When to replace this part?

Set screws on marine engines require periodic tightening checks during each seasonal maintenance, as marine corrosion and vibration fatigue promote progressive loosening even in moderate service. Replacement is mandatory if advanced oxidation is detected on the thread, deformation of the head after tightening attempts, or recurrent loss of tightening after consecutive readjustments. A preventive change strategy during major dismantling work (head inspection, transmission disassembly) avoids unpredictable breakdowns during navigation and reduces emergency repair costs in port.

Mercury / MerCruiser

Equivalent manufacturer part numbers