# 949399 Lock Nut | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta lock nut weighing 0.036 kg and listed for 40 applications across the MD, TMD, D, TD, AQD and TAMD series. It replaces both 6605715 and 950358.

## 🚤 Compatibility

-   **Engine Family:** MD, TMD, D, TD, AQD, TAMD, TAD

Full model list at the end of this description.

## ⚙️ Key Features

-   0.036 kg
-   40 applications across six engine series
-   Supersedes 6605715 and 950358

## 🔌 Function

Threads onto a stud or bolt and resists backing off under vibration, holding the joint's clamping load.

## ⚠️ Common Signs of Failure

-   Nut spins on freely with no drag at all
-   Fastener found loose or backed off in service
-   Thread damaged, stretched or picked up
-   Locking section flattened or polished by earlier reuse

## 🛠️ Service Notes

-   A lock nut is single-use — fit a new one every time the joint is disturbed
-   Check the stud or bolt thread at the same time; a nut that felt loose going on often means the male thread has stretched

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   949399 → Supersedes 6605715

### OEM / Related Numbers

-   950358 earlier number superseded by this part
-   6605715 earlier number superseded by this part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 TAMD122A, TAMD122A/C, TAMD122D, TAMD122P-A, TAMD122P-B, TAMD122P-C
-   Volvo Penta MD100A, MD100B, MD100B-CC
-   Volvo Penta TAD120AHC, TAD120BHC, TAD120CHC
-   Volvo Penta TAMD102A, TAMD102D
-   Volvo Penta TAMD120A, TAMD120B
-   Volvo Penta TAMD70E, TAMD70D
-   Volvo Penta TD100AHC, TD100CHC
-   Volvo Penta TD120AHC, TD120BHC
-   Volvo Penta TMD100A, TMD100C
-   Volvo Penta TMD120A, TMD120B
-   Volvo Penta AQD70D
-   Volvo Penta D100BHC
-   Volvo Penta D70CHC
-   Volvo Penta MD120A
-   Volvo Penta MD70C
-   Volvo Penta TAD121CHC
-   Volvo Penta TAMD103A
-   Volvo Penta TAMD121D
-   Volvo Penta TD121CHC
-   Volvo Penta TD70CHC
-   Volvo Penta TMD102A
-   Volvo Penta TMD121C
-   Volvo Penta TMD122A
-   Volvo Penta TMD70C

## Details

- **Price:** 10.76 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 10.76 AUD | In stock |

## Images

- 949399 Lock Nut | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/949399-lock-nut-genuine-volvo-penta)
> Updated: 2026-09-06