One of the most important choices you can make for your boat’s performance is selecting the right propeller. It affects speed, fuel efficiency, hole shot, handling, RPM, and the lifespan of your outboard. Whichever material you pick, the prop still has to let the motor reach its full-throttle RPM range; how to check that is in our full-throttle RPM range and propeller guide.
Most boaters end up choosing between two materials: aluminum and stainless steel. Each has its advantages and drawbacks. Below is a clear comparison to help you choose.
Aluminum Propeller Pros
- Lower cost, ideal for boaters on a budget.
- If you hit bottom, it is more forgiving: the blades bend rather than passing the shock to your gearcase.
- Lightweight, which makes it easy to exchange or carry a spare.
- Ideal for small to medium outboards (2.5 to 90 HP).
Aluminum Propeller Cons
- Bends when heavily loaded, which may lower maximum speed.
- Not as efficient as stainless because of blade flex.
- In muddy or sandy environments, blades deteriorate more quickly.
- Not the best for big or fast boats.
Best for: pontoons, boats with under 90 horsepower, backup propellers, casual boating, and owners on a tight budget.
Stainless Steel Propeller Pros
- Better acceleration and top speed from stronger, stiffer blades that do not flex.
- More durable, so it handles high RPM, sand, and debris better.
- The extra efficiency usually shows up as a little more top-end speed.
- More ways to tune performance through rake and cupping options (see our propeller terms guide).
- Ideal for engines with 90 horsepower or more, offshore use, and larger boats.
Stainless Steel Propeller Cons
- Higher price.
- The impact of a severe strike passes to your gearcase, which can be costly.
- Heavier than aluminum.
Best for: 90 to 350 HP motors, watersports, performance boating, and offshore fishing.
Which One Should You Choose?
Choose aluminum if:
- Prop hits are likely because you boat in shallow, rocky, or debris-filled water.
- You want a dependable, reasonably priced prop that gets the job done.
- Your outboard is smaller (2.5–90 HP).
- You want a spare prop in the boat.
Choose stainless steel if:
- You are after the best possible performance.
- You have between 90 and 350 horsepower.
- You run long distances or fish offshore.
- At cruising speeds, you want improved fuel efficiency.
- You want to get the most out of a new motor when repowering.
For the 2.5 to 30 hp portables we sell, the factory propeller is aluminum and that is the right choice for almost every owner: small boats spend more time in shallow water, and the gearcase is the part worth protecting. The sizes Suzuki prints for each model, from the DF2.5 to the DF350A, are in our Suzuki propeller chart.
If you are still unsure which propeller is right for you, call (561) 562-6441 or email support@boatmaxonline.com with your motor model and boat.
Browse Suzuki genuine propellers or all outboard propellers and accessories.