Aluminum vs Stainless Steel Propeller
(Which Is Best?)

Aluminum vs Stainless Steel Propeller

Propellers must be made from non-corrosive materials because they’ll be in the water most of the time.

When it comes to your boat’s propeller, you have two options.

Those are aluminum and stainless-steel propellers.

Different types of propellers WILL affect your boat differently.

Understanding how both propellers will affect your boat’s performance is important.

You shouldn’t just flip a coin as they both have benefits and drawbacks. They differ when it comes to performance, longevity, reliability, cost-effectiveness, and efficiency.

Choosing the wrong propeller for your situation can negatively impact your boating experience, so read this article to ensure you have a good idea of what they both offer.

For some, the aluminum propeller will be the better choice, whereas, for others, the stainless-steel propeller would be a better choice. There is no straightforward answer that would apply to everyone.

I’ll explain the advantages and disadvantages of both and compare the two together to give you a good idea of how they perform against each other.Aluminum vs Stainless Steel Propeller

Aluminum Propellers

The main benefits of aluminum propellers are their lightweight and efficiency. They also tend to be more cost-effective but still provide good performance.

The main problem you’ll run into when driving a pontoon boat with an aluminum propeller is when conducting a tight turn, your propeller could cavitate and thus putting you into a dead stop momentarily.

Stainless-steel Propellers

The main benefit of a stainless-steel propeller is its strength. Stainless steel is a very strong material that makes for solid boat propellers. Because of their strength, stainless-steel propellers provide outstanding longevity. Seriously, these little things can last you a long time if not abused.

Though, they tend to be high in cost and, therefore, not the most cost-efficient choice.


Now you have a brief overview of what both propellers have to offer, it’s time to compare them! Comparison is important in understanding how they differentiate. I’ll be talking about the most important factors and telling you which performs better and why. We’ll discuss their durability, strength, cost, hydrodynamics, and performance.


Stainless steel propellers tend to be stronger than aluminum propellers. They are more resistant to saltwater corrosion and less likely to sustain impact damage.

Because of the blades’ thickness, the aluminum must be very bulky and thick to maintain its shape so it doesn’t stretch.

Though aluminum propellers are durable, stainless propellers are still significantly stronger and provide much more longevity.


Stainless steel propellers tend to cost more than aluminum propellers. Though prices vary, stainless-steel propellers can cost almost double that of an aluminum one. There is a significant price difference between the two props.

Despite the low cost, aluminum props work well and provide great value.

Because of this, aluminum props are a lot more cost-effective.


In terms of hydrodynamics, the stainless-steel propeller is the best choice.

This is because an aluminum propeller becomes a sort of cavitational storm. After all, the blades are so thick. Every small nick that the propeller sustains causes more of a cavitational storm.  This means that you turn into a lot of slippages.


Aluminum propellers can cavitate and cause your boat to halt momentarily, killing your momentum. This can be a huge mood killer when participating in watersports. Imagine missing some good waves because of the material of your propeller.

Stainless steel is much more efficient and has significantly less flex, providing a better top-end speed. Because of these reasons, I believe steel propellers are the ideal choice for watersports.

Aluminum vs SS Prop: Summary

In summary, stainless steel propellers provide much better performance and longevity than aluminum propellers. However, aluminum propellers are durable and sit at a more affordable price. This is all you must know.