Volvo Penta Shaft Coupling 21827365
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Volvo Penta 21827365 is a genuine OEM shaft coupling used in inboard driveline installations. Current Volvo Penta parts references identify it as a clamp-type propeller shaft coupling for 25 mm shaft diameter applications, and the strongest public application trail ties it to D1 engines with MS10 and MS15 gearboxes. Current Volvo Penta references also show earlier part numbers 827924 and 827925 updating to 21827365.
Key Features
- Genuine Volvo Penta OEM shaft coupling, part number 21827365.
- Clamp-type coupling for 25 mm propeller shaft applications.
- Two-piece conic design for central alignment and strong torsional hold without shaft damage.
- Designed for installation without tapering or keyway cutting on the shaft.
- Current reference dimensions: approximately 63 mm length, 102 mm diameter, and 3.1 kg weight.
Engine Compatibility
The strongest supportable fitment trail for Volvo Penta 21827365 is with D1 engine applications using MS10 or MS15 gearboxes. Public Volvo Penta coupling references specifically place this 25 mm clamp-type version in that engine and gearbox combination, so the safest fitment standard is the exact Volvo Penta driveline specification for the engine, gearbox, and shaft diameter being serviced.
Serial Number Fitment Notice
Fitment can vary by engine version, gearbox, shaft diameter, and driveline configuration. Confirm Volvo Penta part number 21827365 against the exact engine serial number, gearbox model, and 25 mm shaft size before ordering, especially on boats that may have had prior shaft, gearbox, or coupling changes.
When This Part Needs Replacement
Replace this shaft coupling when the existing coupling shows fretting, distortion, loosening, corrosion, vibration-related wear, or damage from driveline misalignment. It is also a sensible replacement when upgrading or rebuilding a driveline where the shaft diameter and gearbox application match this exact Volvo Penta coupling specification.
Installation Notes
This coupling is designed to simplify installation by avoiding taper machining and keyway cutting, but it still needs to be matched to the correct shaft size and driveline setup. Volvo Penta's public reference describes it as a two-piece conic coupling with alignment-focused design, so proper shaft preparation, correct shaft tolerance, and careful driveline alignment remain important during installation. Current Volvo Penta guidance for this coupling family notes a required shaft tolerance of h9 (0 to -0.052 mm).
Alternate/Superseded Part Numbers
Current Volvo Penta parts references show 827924 and 827925 as earlier part numbers updated to 21827365. Use 21827365 as the current primary OEM ordering number for this listing.
Parts Desk Insight
Shaft couplings are one of those parts that look simple until shaft diameter or gearbox details are slightly off. Matching the exact shaft size and gearbox combination first usually saves much more time than trying to make a near-match work during alignment.
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Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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