990939 Flange Nut | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta M6 flange nut weighing 0.018 kg and listed for 52 applications across the D, TAD, TWD, TADH and BOX ranges. It replaces part numbers 21790519, 945407, 993786 and 1676515 - and 21790519 is replaced by two current parts, this nut and flange screw 990862, so both are needed to make up what that one number used to supply.

🚤 Compatibility

• Engine Family: D, TAD, TWD, TADH, BOX
• HP Range: 13-480 HP

Full model list at the end of this description.

⚙️ Key Features

• M6
• 0.018 kg
• 52 applications across five ranges
• Replaces 21790519, 945407, 993786 and 1676515
• 21790519 now takes this nut and flange screw 990862 together
• Also supersedes Volvo part numbers 3589022, 3825634, 848358, 848480 and 861915

🔌 Function

Locks onto an M6 stud or screw with an integral flange that spreads the clamping load without a separate washer.

⚠️ Common Signs of Failure

• Joint working loose in service
• Flange face or serrations flattened
• Thread stripped or crossed
• Nut seized to the stud by corrosion

🛠️ Service Notes

• If you are ordering against old number 21790519, order flange screw 990862 as well - that number is now made up of two current parts and this nut on its own will not complete the job
• One of the numbers it replaces was catalogued as a spring nut, so check what is actually fitted before ordering

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 990939 → Supersedes 21790519

OEM / Related Numbers

• 945407 earlier number superseded by this part
• 993786 earlier number superseded by this part
• 1676515 earlier number superseded by this part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, D6-480A-G
• Volvo Penta D13B-L MP, D13B-E MH, D13B-E MH (FE), D13B-F MG, D13B-F MG (FE), D13B-D MP, D13B-M MP, D13B-C MP, D13C8-B MP
• Volvo Penta D8A2-A MP, D8A5-A MH, D8A6-A MH, D8A5-A MG, D8A6-A MG, D8A4-A MP, D8A1-A MP, D8A3-A MP
• Volvo Penta D4-150A-G, D4-230A-G, D4-270A-G, D4-320A-G, D4-300A-G
• Volvo Penta D1-30F, D1-13F, D1-20F
• Volvo Penta BOX
• Volvo Penta D2-40F
• Volvo Penta PCC
• Volvo Penta TAD840-43VE
• Volvo Penta TAD850-52VE
• Volvo Penta TAD853VE
• Volvo Penta TAD870-73VE
• Volvo Penta TAD880-84VE
• Volvo Penta TADH880-84VE
• Volvo Penta TWD1683VE