# 20933396 Flange Nut | Genuine Volvo Penta Part

🔧 Product Description

  

Genuine Volvo Penta Flange Nut - Part Number: 20933396

  

OEM fastening or load-distribution component used in the tad550 cylinder-head valve-cover and oil-separation assembly. It restores the specified thread, strength, length and clamping geometry required by the original assembly.

  

⚙️ Key Features

  

• Manufactured to the original Volvo Penta dimensional and material specification

• Maintains correct fit, alignment and service access

• Designed for diesel-engine heat, vibration and operating load

• Direct replacement for a worn, damaged or missing original component

• Must be matched by part number, engine product and serial/configuration

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 20933396 (OEM catalogue reference)

  

OEM / Related Numbers:

  

• 20970527 cylinder head

• 21455723 valve cover

• 20412589 filler cap

• 20972267 valve-cover gasket

• 20840801 gasket

• 20933359 oil separator

• 20933362 separator seal

• 949556 flange screw

• 11700334 cylinder-head cover screw

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• TAD550 cylinder-head valve-cover and oil-separation assembly

  

Typically suits:

  

• Engine models:

• TAD550GE; TAD551GE

• HP Range: Approximately 180-220 HP, depending on generator rating

• Engine Type: 5.7 L six-cylinder common-rail generator diesel

• Year Range: Approximately 2000s-2010s

  

🔌 Function

  

Provides the specified clamping, locating or load-distribution function so the connected assembly remains secure and aligned.

  

Common signs of failure:

  

• Fastener repeatedly loosens under vibration

• Damaged, stretched, corroded or stripped threads

• Loss of clamping force or component alignment

• Fretting, movement or cracking around the secured joint

  

📦 Condition

  

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 1.45 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1.45 AUD | In stock |

## Images

- 20933396 Flange Nut | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20933396-flange-nut-genuine-volvo-penta)
> Updated: 2026-08-01