# 21668 Nut Retainer | Genuine Volvo Penta Part

## 🔧 Product Description

A genuine Volvo Penta nut-retaining component with the valid five-digit part number 21668. It locks or captures the associated nut in its catalogued assembly so the fastener remains positioned during installation and operation.

## ⚙️ Key Features

-   Genuine Volvo Penta legacy-format part number
-   Designed to retain the associated nut
-   Position-specific shape and material
-   Prevents fastener rotation or loss where specified
-   Direct replacement for the exact original retainer
-   Engine type: Volvo Penta marine or industrial mechanical assembly

## 🔌 Function

Captures or locks the specified nut so it cannot rotate freely or fall from its installation position.

## ⚠️ Common Signs of Failure

-   Nut movement or loosening
-   Retainer cracking or loss of spring tension
-   Incorrect nut alignment during assembly
-   Fastener loss after retainer failure

## 🛠️ Service Notes

-   Fit the retainer the right way round so the captive nut sits square to its hole and the fastener enters without cross-threading
-   Renew retainers that are corroded or have lost their spring tension rather than reusing them; one that no longer grips lets the nut spin or drop out of reach behind a panel
-   Clean the panel or flange and its hole before fitting, and treat corrosion at the same time — this is usually what killed the original
-   Match the retainer to the fastener thread and size, and remember the retainer only locates and holds the nut, so do not rely on it to take a heavy tightening load

## 🔄 Supersession & Cross Reference

### OEM / Related Numbers

-   3853403 - other Volvo Penta nut-retainer designs; not interchangeable without catalogue confirmation
-   3853306 - other Volvo Penta nut-retainer designs; not interchangeable without catalogue confirmation
-   21480060 - other Volvo Penta nut-retainer designs; not interchangeable without catalogue confirmation
-   21480062 - other Volvo Penta nut-retainer designs; not interchangeable without catalogue confirmation
-   20505959 - other Volvo Penta nut-retainer designs; not interchangeable without catalogue confirmation
-   3852009 - other Volvo Penta nut-retainer designs; not interchangeable without catalogue confirmation

## 📦 Condition

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

## Details

- **Price:** 25.82 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 25.82 AUD | In stock |

## Images

- 21668 Nut Retainer | Genuine Volvo Penta Part

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21668-nut-retainer-genuine-volvo-penta)
> Updated: 2026-10-10