lego 40 tooth gear Technic Gear 40 Tooth | Part 3649

lego 40 tooth gear Technic Gear 40 Tooth | Part 3649Power Up Your Technic Builds Ready to elevate your mechanical creations? The LEGO Technic 40 tooth gear is a powerhouse part that delivers unmatched torque and control. As one of the largest standard spur gears in the Technic system, it's your go to solution for major gear slowdowns (also known as gear reduction), enabling powerful movements in your builds. Whether you're lifting heavy loads, powering a slow moving crane, or designing a custom

Power Up Your Technic Builds

Ready to elevate your mechanical creations? The LEGO® Technic 40-tooth gear is a powerhouse part that delivers unmatched torque and control. As one of the largest standard spur gears in the Technic system, it's your go-to solution for major gear slowdowns (also known as gear reduction), enabling powerful movements in your builds. Whether you're lifting heavy loads, powering a slow-moving crane, or designing a custom gearbox, this gear is a cornerstone of serious engineering.

Applications and Creative Uses

This gear is a builder's best friend for transferring power and motion with precision. Its large size makes it a perfect anchor point in complex gear trains and steering systems.

• High-Torque Gearboxes: Use it as the final gear in a reduction sequence to maximize turning power—ideal for vehicle lifts and heavy-duty winches.
• Turntables and Platforms: Its broad diameter is perfect for creating stable, slow-rotating platforms for cranes, excavators, or display builds.
• Precise Speed Control: Combine it with smaller gears to fine-tune motion and achieve specific gear ratios in functional models.

Start building your next mechanical marvel by combining this gear with other essential elements from our Technic gears collection, as well as Technic beams and pins and connectors.

Key Specifications

• Part ID: 3649 (Alternate ID: 34432)
• Tooth Count: 40
• Type: Spur Gear
• Compatibility: Fully compatible with all LEGO® Technic axles and gear systems.

A Little Piece of Trivia

The 40-tooth gear is more than just a part—it's a piece of LEGO® history. Introduced in 1977 with the original "Expert Builder" series (later renamed Technic), it appeared alongside the 8-tooth and 24-tooth gears. These foundational components made it possible to create real, functional movement in LEGO® models for the first time. Over four decades later, the 40-tooth gear remains a staple in Technic sets worldwide thanks to its unmatched versatility and performance.

Ready to take your build to the next level? Add this essential gear to your toolkit and unlock new possibilities in power, precision, and play.

LEGO® parts are intended for builders aged 4 and up. They may pose a choking hazard for children under 3 years old.