# 20778505 Hex. Socket Screw | Genuine Volvo Penta Part

🔧 Product Description

  

Genuine Volvo Penta Hex. Socket Screw - Part Number: 20778505

  

Application-specific hex. socket screw used in the engine block, accessory drive and service assembly on the listed Volvo Penta engines. Secures the documented engine-block or accessory-drive component using an internal-hex drive.

  

⚙️ Key Features

  

• Genuine Volvo Penta hex. socket screw

• Direct service replacement for part number 20778505

• Designed for the engine block, accessory drive and service assembly

• Secures the documented engine-block or accessory-drive component using an internal-hex drive

• Application family: Four- and six-cylinder turbocharged industrial diesel; Approximately 2003 - 2015

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 20778505 (Volvo Penta OEM reference)

  

OEM / Related Numbers:

  

• VOE20778505 - Volvo Construction Equipment prefixed number format

• 20460004 - cylinder block

• 20791246 / 21009706 / 22037735 / 22425892 - crankcase references

• 20460006 - main fastener

• 20460001 - block bushing

• 20405716 / 20405718 - plugs

• 20405584 - guide sleeve

• 969011 - gasket

• 20791446 - related sealing kit

• 20555182 / 20940389 - accessory-drive gears

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• Volvo Penta D5D/D6D/D7D and TAD560/TAD760-series engine assemblies

  

Typically suits:

  

• Engine models:

• TAD560VE; TAD561VE; TAD650VE; TAD660VE

• TAD750VE; TAD760VE; TAD761VE; TAD762VE

  

• HP Range: Approximately 170HP - 300HP

• Engine Type: Four- and six-cylinder turbocharged industrial diesel

• Year Range: Approximately 2003 - 2015

  

🔌 Function

  

Secures the documented engine-block or accessory-drive component using an internal-hex drive.

  

Common signs of failure:

  

• Rounded drive surfaces or damaged threads

• Stretching, cracking, corrosion or permanent deformation

• Fastener repeatedly loosens or cannot retain the specified torque

• Fretting or movement visible at the joint

• Incorrect seating or clamp load caused by substituted hardware

  

Service / Installation Notes:

  

• Confirm thread, length, strength grade and any single-use restriction.

• Use the specified torque, angle and locking method on clean threads.

  

📦 Condition

  

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 28.34 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 28.34 AUD | In stock |

## Images

- 20778505 Hex. Socket Screw | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20778505-hex-socket-screw-genuine-volvo-penta)
> Updated: 2026-08-01