# 990973 Hexagon Nut | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta hexagon nut weighing 0.059 kg and listed for 35 applications across the D and EM ranges. It supersedes part number 955786.

## 🚤 Compatibility

-   **Engine Family:** D, EM
-   **HP Range:** 145-480 HP

Full model list at the end of this description.

## ⚙️ Key Features

-   0.059 kg
-   35 applications across the D and EM ranges
-   Supersedes 955786
-   Quantity varies by assembly, most commonly one

## 🔌 Function

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

## ⚠️ Common Signs of Failure

-   Nut working loose in service
-   Flats rounded by a slipping spanner
-   Thread crossed or stripped
-   Corrosion seizing the nut to its stud

## 🛠️ Service Notes

-   Fit the original washer or locking arrangement with it - a plain hexagon nut relies on them entirely

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   990973 → Supersedes 955786 → Supersedes 19628

### OEM / Related Numbers

-   955786 earlier number superseded by this part
-   906582 earlier number superseded by this part
-   906640 earlier number superseded by this part
-   19628 earlier number superseded by this part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, D6-440I-WJ-G, D6-480I-WJ-G, D6-300D-G, D6-340D-G, D6-380D-G, D6-440D-G, D6-480D-G, D6-400A-G, D6-440A-G, D6-300I-G
-   Volvo Penta D4-175I-G, D4-230I-G, D4-270I-G, D4-320I-G, D4-300I-G, D4-150A-G, D4-230A-G, D4-270A-G, D4-320A-G, D4-300A-G, D4-145I-G
-   Volvo Penta D8A2-A MP, D8A5-A MH, D8A6-A MH, D8A4-A MP, D8A1-A MP, D8A3-A MP
-   Volvo Penta EM-PMI540-T3000-2000-QUAD

## Details

- **Price:** 8.37 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 8.37 AUD | In stock |

## Images

- 990973 Hexagon Nut | Genuine Volvo Penta Part
- 990973 Hexagon Nut | Genuine Volvo Penta Part - photo 2 of 2

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/990973-hexagon-nut-genuine-volvo-penta)
> Updated: 2026-09-23