20731557 Hexagon Screw | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta fine-pitch hexagon screw for an application in which exact thread form, length, strength and coating are controlled by the original assembly specification. It should be selected by part number and not replaced with a visually similar general-purpose fastener.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD840GE
• Volvo Penta TAD552VE
• Volvo Penta TAD853VE
• Volvo Penta TAD880-84VE
• Volvo Penta TAD580-83VE
• Volvo Penta TAD570-72VE
• Volvo Penta TAD570-71VE-B
• Volvo Penta TAD550-51VE
• Volvo Penta TAD540-42VE
• Volvo Penta TAD840-43VE
• Volvo Penta TAD850-52VE
• Volvo Penta TAD870-73VE
• Volvo Penta TADH880-84VE

• Engine Family: TAD, TADH

⚙️ Key Features

• Genuine Volvo Penta fine-pitch hexagon screw
• OEM-specified thread and grip dimensions
• Correct strength class and surface treatment
• Maintains designed clamp load in the original assembly
• Requires catalogue and serial-number confirmation
• Engine type: Application-specific Volvo Penta engine or propulsion hardware

🔌 Function

Provides the precise clamping force required by the designated joint while resisting loosening under vibration and temperature changes.

⚠️ Common Signs of Failure

• Thread galling or cross-threading
• Rounded head or tool damage
• Fastener stretch or corrosion
• Joint movement caused by insufficient clamp load

🛠️ Service Notes

• Check the length, thread and strength grade of the replacement against the screw you removed — engine fasteners are chosen for a specific clamp load, and a longer or softer screw is not a substitute
• Clean the threads in the component and make sure the mating faces are clean and flat before assembly; dirt, paint or old sealant in a joint feels like tightness and leaves the joint loose
• Tighten to the torque figure and the tightening sequence given in the workshop manual for your engine, working up progressively rather than pulling each screw down in one go
• Use thread locking or sealing compound only where the manual calls for it, and renew the locking washer, tab washer or nut that works with the screw
• Renew rather than reuse screws that are corroded, thread-damaged or visibly stretched, and any screw the manual tightens by torque-plus-angle

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging