Volvo Penta Hex Socket Screw Bolt – Fits AD30, BB1, MD30, TMD30 Engines (Replaces 956590)
Volvo Penta Hex Socket Screw Bolt – Fits AD30, BB1, MD30, TMD30 Engines (Replaces 956590) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Volvo Penta Hex Socket Screw Bolt – Fits AD30, BB1, MD30, TMD30 Eng...
Product Details
This high-quality Volvo Penta Hex Socket Screw Bolt is a crucial component for engine mounting, designed for a precise fit on several marine diesel engines, including the AD30, BB1, MD30, and TMD30 series.
It serves as a direct aftermarket replacement, providing an effective interchange for Volvo Penta part numbers 956590 and 956590-4.
- Engineered for securing engine components in a marine environment.
- Constructed from durable, corrosion-resistant stainless steel.
- Includes one screw bolt per package.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket parts.
| Brand | Part Number | Notes |
|---|---|---|
| Volvo Penta | 956590 | Original OEM Part Number |
| Volvo Penta | 956590-4 | Direct Replacement |
Engine & Model Compatibility
Confirm your engine model in the table below.
| Brand | Model | Type | OEM Part No. |
|---|---|---|---|
| Volvo Penta | AD30 | Marine Diesel Engine | 956590 |
| Volvo Penta | BB1 | Marine Diesel Engine | 956590 |
| Volvo Penta | MD30 | Marine Diesel Engine | 956590 |
| Volvo Penta | TMD30 | Marine Diesel Engine | 956590 |
Technical Specs
- Product Type
- Hex Socket Head Screw Bolt
- Installation
- Engine component mounting
- Material
- Stainless steel (likely)
- Dimensions
- 14.0 x 10.5 x 2.0
- OEM Part Number
- 956590
- Also Known As
- 956590-4
- Package Quantity
- 1 piece
- Condition
- New
What’s in the Box
- 1 x Hex Socket Screw Bolt (Replaces 956590/956590-4)
Installation Notes
- Ensure the engine is completely off and has cooled down.
- Identify and locate the existing bolt that requires replacement.
- Carefully remove the old bolt using the correct size hex socket tool.
- Thoroughly clean the threaded area to remove any dirt, grease, or corrosion.
- Before installing, visually compare the new bolt with the old one to confirm an identical match.
- Thread the new hex socket screw bolt by hand initially to prevent cross-threading.
- Use a torque wrench to tighten the bolt to the engine manufacturer's specified torque. Do not overtighten, as this can cause damage.
Troubleshooting & FAQ
How do I know if this is the correct bolt for my engine?
First, confirm your engine model is listed as compatible (AD30, BB1, MD30, TMD30). Second, cross-reference the part number 956590 with your engine's service manual. Finally, always compare the new bolt with your old one before installation to ensure an exact match in size and threading.
What are the torque specifications for this bolt?
Specific torque specifications are not provided with this part. It is critical to consult your Volvo Penta service manual for the correct torque values, as they vary based on the component being secured. Incorrect torque can lead to component failure or engine damage.
What are common signs that a screw bolt like this needs to be replaced?
Inspect your existing bolts for signs of failure such as heavy corrosion, stripped or damaged threads, a rounded hex socket head that prevents a proper grip, or any visible stretching or narrowing of the bolt shaft, which indicates it has been over-torqued.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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