Derale 17017 Heavy-Duty 17" Stainless Steel Flex Fan Standard Rotation Black Hub

The Derale 17017 is a heavy-duty, belt-driven flex fan engineered to deliver maximum airflow at low RPM while reducing parasitic drag at high engine speeds. Measuring 17-1/4 inches in diameter, this Series 1000 flex fan is a popular upgrade for classic cars, trucks, and high-performance street machines that rely on engine-driven cooling.

The flex fan design allows the six stainless steel blades to flatten at high RPM, reducing resistance and freeing up horsepower at highway speeds. At idle and low speeds, the blades maintain a deep pitch to pull maximum air through the radiator — exactly when cooling is needed most.

Key Features:

• 17-1/4" overall diameter with 2-3/8" depth
• 6 reinforced stainless steel blades for durability and corrosion resistance
• Powder-coated black steel hub for long-lasting finish
• Rated up to 10,000 RPM
• Standard (clockwise) rotation
• Flange bolt spacing: 1-3/4" to 2-1/4"
• Mounting surface to front: 1/2" | Mounting surface to rear: 1-7/8"
• Improves engine cooling performance and fuel economy
• Large blade surface area pulls more air at low speeds
• Reinforced blade construction for extended service life

The Derale 17017 flex fan is sold individually and is designed as a direct-bolt-on replacement or performance upgrade for vehicles equipped with a mechanical, belt-driven cooling fan setup.