21686481 Six Point Screw | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta six point screw weighing 0.102 kg, listed for seven TAD series engine applications. The six-point head requires the correct socket to avoid rounding, which matters on a fastener in a vibration-exposed engine location.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD550GE
• Volvo Penta TAD551GE
• Volvo Penta TAD750GE
• Volvo Penta TAD751GE
• Volvo Penta TAD752GE
• Volvo Penta TAD753GE
• Volvo Penta TAD754GE

• Engine Family: TAD

⚙️ Key Features

• OEM Volvo Penta part number 21686481
• Six point head - use the matching socket to avoid rounding
• Net weight 0.102 kg
• Fits TAD series industrial and marine diesel engines
• 4 used per assembly

🔌 Function

Clamps mating components together at a specified torque, holding the assembly in alignment. Correct length and grade give full thread engagement and the intended clamping force.

⚠️ Common Signs of Failure

• Rounded or damaged head flats
• Stripped, galled or seized threads
• Corrosion or heat scaling
• Screw stretched or necked after over-torquing
• Repeated loosening, or a sheared fastener

🛠️ Service Notes

• Check the head, threads and seating face before reuse; a screw with rounded flats, a stretched thread or heavy corrosion should be renewed, not refitted
• Clean the threads and the mating face so the screw pulls down onto metal rather than onto dirt or old sealant
• Use a correctly sized spanner or socket fully engaged on the head, and support the component so the screw is not loaded sideways as it tightens
• Refit the same washers, locking devices or sealing compound that were originally used
• Tighten to the figure and sequence given in the workshop manual for your engine, pulling the screws of a multi-screw joint down evenly in stages

🔄 Supersession & Cross Reference

Other-Brand OEM Numbers

• VOE21686481

Aftermarket / Verified Equivalents

• Engine brackets: 20723978 and 20723984
• Engine mounting: 20405727
• Washers: 20405606 and 20460868
• Nut: 20542497

📦 Condition

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