The Genuine Tohatsu 346-64121-5 Propeller Nut is designed for selected 9.9HP to 30HP 2-stroke and 4-stroke outboard motors. Manufactured to original equipment specifications, this M10 × 1.50 threaded nut secures the propeller assembly onto the propeller shaft. Ideal for replacing corroded, damaged or missing nuts during propeller maintenance, it provides a factory-specified replacement for reliable propeller retention and safe outboard operation.
Nuts, Bolts, Screws & Washers (Tohatsu)
Propeller Nut 346-64121-5
Brand: Tohatsu
SKU: 346-64121-5
$8.80
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Key benefits
Key Benefits
- - Genuine Tohatsu OEM replacement propeller nut.
- - Designed for selected 9.9HP–30HP outboard motors.
- - M10 × 1.50 threaded fitting.
- - Secures the propeller to the propeller shaft.
- - Compatible with the specified factory propeller retaining washer and split pin.
- - Suitable for propeller removal, replacement and maintenance.
- - Replaces earlier OEM propeller nut references.
- - Supplied individually.
Specifications & Dimensions
- - Manufacturer: Tohatsu
- - OEM Part Number: 346-64121-5
- - OEM Ordering Number: 346641215M
- - OEM Description: Propeller Nut
- - Product Type: Propeller shaft retaining nut
- - Thread Diameter: M10 (10 mm / 0.394")
- - Thread Pitch: 1.50 mm (0.059")
- - Thread Specification: M10 × 1.50
- - Installation Location: Propeller shaft
- - Retention Method: Split-pin secured propeller fastening arrangement
Compatible Tohatsu Outboards
- 2-Stroke Outboards
- - M9.9D2 – 9.9HP: Selected gearcase configurations.
- - M15D2 – 15HP: Selected gearcase configurations.
- - M18E2 – 18HP: Selected gearcase configurations.
- - M25C2 – 25HP: Factory parts catalogue.
- - M25C3 – 25HP: Selected propeller shaft assemblies.
- - M30A3 – 30HP: Factory parts catalogue.
- - M30A4 – 30HP: Genuine OEM parts records.
- The M25C2/M30A3 factory catalogue and M30A4 parts listing specifically identify this propeller nut.
4-Stroke – 9.9HP to 20HP
- - MFS9.9B2 – 9.9HP: Documented 2003 model.
- - MFS9.9E – 9.9HP: Documented 2017 model.
- - MFS15C – 15HP: Documented 2013–2014 models.
- - MFS20C – 20HP: Documented 2013–2014 models.
- - MFS15E – 15HP: Documented 2026 model.
- - MFS20E – 20HP: Documented 2026 model.
4-Stroke – 25HP to 30HP
- - MFS25A – 25HP: Selected factory propeller shaft assemblies.
- - MFS30A – 30HP: Selected factory propeller shaft assemblies.
- - MFS25B – 25HP: Documented 2005 and 2013–2014 models.
- - MFS30B – 30HP: Documented 2005 and 2013–2014 models.
- - MFS25D – 25HP: Listed in the propeller assembly parts catalogue.
- - MFS30D – 30HP: Listed in the propeller assembly parts catalogue.
Cross-Reference & Replacement Part Numbers
- Genuine Tohatsu OEM
- - 346-64121-5 – Current genuine propeller nut.
- - 346641215M – Current OEM ordering number.
- - 346-64121-0 / 346641210M – Earlier OEM part number, superseded by 346641215M.
Signs the Propeller Nut Needs Replacing
- - Damaged or stripped internal threads.
- - Excessive corrosion.
- - Rounded or damaged nut flats.
- - Nut cannot be tightened correctly.
- - Nut is cracked or distorted.
- - Damaged split-pin retention arrangement.
- - Nut has become loose during operation.
- - Original nut is missing following propeller removal.
Important Fitment Information
- - Confirm the engine model and serial number before ordering.
- - This is a genuine Tohatsu OEM propeller nut, not an aftermarket replacement.
- - Thread: M10 × 1.50.
- - Suitable for selected 9.9HP–30HP 2-stroke and 4-stroke outboards.
- - Not every outboard within this horsepower range uses the same nut.
- - Check the original propeller shaft thread before installation.
- - Inspect the propeller washer and thrust holder for wear or damage.
- - Install the correct retaining split pin.
- - Replace a damaged or previously distorted split pin rather than reusing it.
- - Tighten the nut according to the manufacturer's service manual.
- - Ensure the propeller is correctly seated and secured before operating the engine.
Shipping
Ships Australia-wide