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• 955786 earlier number superseded by this part
• 906582 earlier number superseded by this part
• 906640 earlier number superseded by this part
• 19628 earlier number superseded by this part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