# 990966 Hexagon Nut | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta hexagon nut listed for 25 D-series applications. It supersedes part number 955780.

## 🚤 Compatibility

-   **Engine Family:** D
-   **HP Range:** 175-480 HP

Full model list at the end of this description.

## ⚙️ Key Features

-   25 D-series applications
-   Supersedes 955780

## 🔌 Function

Clamps a threaded joint through a plain six-sided nut tightened onto a stud or bolt.

## ⚠️ Common Signs of Failure

-   Nut found loose at service
-   Flats rounded by a slipping spanner
-   Thread stripped or crossed
-   Corrosion seizing the nut onto its stud

## 🛠️ Service Notes

-   A plain hexagon nut relies on the washer or locking arrangement specified for the joint - fit whatever was used originally rather than leaving it out
-   No weight is published here, so order by part number against the application rather than by comparison with the other hexagon nuts in this run

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   990966 → Supersedes 955780 → Supersedes 151233

### OEM / Related Numbers

-   955780 earlier number superseded by this part
-   10432 earlier number superseded by this part
-   10455 earlier number superseded by this part
-   20460444 earlier number superseded by this part
-   151223 earlier number superseded by this part
-   20459037 earlier number superseded by this part
-   241106 earlier number superseded by this part
-   3552599 earlier number superseded by this part
-   3852518 earlier number superseded by this part
-   906546 earlier number superseded by this part
-   906574 earlier number superseded by this part
-   947414 earlier number superseded by this part
-   955788 earlier number superseded by this part
-   151233 earlier number superseded by this part

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta D6-340I-G, D6-380I-G, D6-440I-G, D6-480I-G, D6-300A-G, D6-340A-G, D6-380A-G, D6-480I-WJ-G, D6-400A-G, D6-300I-G
-   Volvo Penta D4-175I-G, D4-230I-G, D4-270I-G, D4-320I-G, D4-300I-G, D4-230A-G, D4-270A-G, D4-320A-G, D4-300A-G
-   Volvo Penta D16C1-E MH, D16C1-F MH, D16C2-E MH, D16C2-F MH
-   Volvo Penta D8A5-A MH, D8A6-A MH

## Details

- **Price:** 0.57 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 0.57 AUD | In stock |

## Images

- 990966 Hexagon Nut | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/990966-hexagon-nut-genuine-volvo-penta)
> Updated: 2026-08-22