Parsun
/parsun/products/t40-04000021-slotted-nutSLOTTED NUT T40-04000021
Satisfaction rating5
Aftermarket product
PartX Rating: Good
Yamaha Motors 90171-16011-00
Castle Nut
The Yamaha OEM nut offers the highest assurance of correct thread pitch/tolerances and controlled metallurgy for a prop-retaining fastener where loosening or thread damage can lead to prop loss. The aftermarket options appear compatible, but none provides evidence of identical OEM sourcing or superior material specifications.
$16.06
View recommended partPartX Alternatives — This part: Good
Ratings provided by PartX™
| Product | Price | Rating | Comment |
|---|---|---|---|
| Yamaha Motors 90171-16011-00 Castle Nut Genuine OEM product | $16.06 In stock 5+ in stock | Best | Japan-made genuine Yamaha castle nut with clean thread form and evenly cut castellations (slots) for the cotter pin. OEM sourcing provides the highest confidence in correct fit, alloy control, and corrosion resistance on the prop shaft. |
| Parsun T40-04000021 SLOTTED NUT (viewing this product) Aftermarket product | $9.90 In stock 5+ in stock | Good | Parsun genuine part made in China; visually it has uniform slot spacing and clean internal threads similar to the OEM nut. It’s a functional substitute, but the different sourcing provides less assurance on alloy spec and tolerance control than the Japan-made Yamaha part. |
Product Questions 0
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Supersession Chain
| Name | SKU | Superseding SKU |
|---|---|---|
| SLOTTED NUTViewing this product | T40-04000021 | Current |
OEM Interchange
| Name | SKU | Price | Brand |
|---|---|---|---|
| Castle Nut | 90171-16011-00 | $16.06 | Yamaha Motors |