Description
SP446: High-Speed Performance and Torque for the Toughest Finishing Jobs
The SP446 from Allen Engineering is a powerful, high-speed walk-behind concrete trowel engineered to meet the demands of today’s most challenging slab finishing projects. Designed for superior torque, efficiency, and operator control, the SP446 combines innovation and strength in one of the most advanced concrete finishing machines in its class.
At the heart of the SP446 is the Honda GX390 engine—trusted by professionals worldwide for its durability, smooth operation, and long-lasting performance. Paired with a variable torque converter clutch and a robust helical gearbox, this machine delivers maximum torque at low speeds and consistent power at high speeds, making it ideal for both floating and final finishing.
Torque Converter Clutch for Precision Control
The SP446 sets itself apart with its variable torque converter clutch, which offers exceptional control over rotor speed and torque. Unlike traditional centrifugal clutches, this system allows the operator to transition between low-speed torque for heavier floating and high-speed performance for tight, polished finishes.
This flexibility makes the SP446 perfect for a wide range of jobsite conditions, from wet concrete to cured surface touch-ups. Whether you’re working on commercial floors, large slabs, or complex finishing zones, this concrete trowel adapts to your needs with ease.
Engineered for High-Speed Finishing
Equipped with a heavy-duty helical gearbox, the SP446 maximizes torque transfer with minimal energy loss—giving operators faster response, smoother operation, and extended machine life. This high-efficiency transmission, paired with the Honda GX390 engine, ensures consistent output over long hours of operation, making the SP446 a true production machine.
The SP446 also features Allen’s redesigned plow handle system, providing ergonomic blade pitch control with an increased adjustment range of 28 to 30 degrees. This allows for greater finishing precision and ease of operation during long shifts.
Built to Withstand the Jobsite
Like all Allen trowels, the SP446 is constructed with a rugged steel frame, reinforced components, and a design focused on reliability. It’s built to handle the demands of daily commercial use, ensuring your investment delivers consistent performance job after job.
Why Choose the SP446?
✅ Powered by a reliable Honda GX390 engine for peak performance
✅ Variable torque converter clutch offers precise speed and torque control
✅ Heavy-duty helical gearbox delivers high-speed, high-torque finishing
✅ Ideal for large slabs and commercial work as a high-output concrete trowel
✅ Built to last as a dependable concrete finishing machine in any fleet of trowels
Finish Faster and Stronger with the SP446
For contractors who need versatility, speed, and strength in one package, the SP446 is the ultimate choice. This advanced concrete trowel brings next-level power and precision to your finishing lineup—ready to perform when it matters most.
