Small Gear, 2.5 mm Hole

Miniature Mechanical Gear with 2.5 mm Center Bore

This miniature mechanical gear features a 2.5 mm center bore and is designed for compact gear-driven mechanisms, educational projects, robotics prototypes, hobby constructions, and custom mechanical assemblies. The gear transmits rotational motion through engagement with other compatible gears, supporting experiments involving mechanical power transmission, speed changes, and rotational direction. Its existing center hole can also serve as a pilot hole for carefully enlarging the bore to accommodate different shaft diameters, provided sufficient material remains around the opening. Available in packs of 10 or 100 gears for classroom activities, prototyping, and mechanical construction projects.

Product Specifications

Gear Dimensions and Mounting

Caution:

Verify shaft dimensions and gear fit before installation. A nominal 2.5 mm bore does not guarantee a particular clearance or press fit. When enlarging the center hole, secure the gear properly and use drilling tools appropriate for its material. Avoid excessive force that may damage the gear teeth, crack the gear, or deform the bore. Bore modification is irreversible and may affect gear strength and alignment.

Available Package Quantities

Applications and Benefits:

• Supports construction of compact gear-driven mechanical assemblies.
• Demonstrates rotational motion and gear engagement when paired with compatible mechanical gears.
• Supports experiments involving speed reduction, speed increase, and mechanical power transmission.
• Illustrates the relationship between rotational speed and torque in properly configured gear mechanisms.
• Demonstrates reversal of rotational direction in meshed spur gear assemblies, when used with compatible spur gears.
• Features a 2.5 mm center bore for mounting on appropriately sized shafts and axles.
• Allows potential bore enlargement for custom shaft mounting requirements when gear construction permits.
• Provides reusable components for STEM activities, science experiments, and classroom engineering demonstrations.
• Suitable for educational robotics projects, hobby mechanisms, and small mechanical prototypes.
• Useful for students, educators, engineers, designers, and DIY enthusiasts developing small mechanical systems.
• Available in 10-piece and 100-piece packages for individual projects or multiple experimental assemblies.

Safety Information:

Small parts present a potential choking hazard. Keep away from young children. When drilling or modifying the center bore, wear appropriate eye protection and secure the gear using suitable equipment. Adult supervision is required when students use drilling or cutting tools. Verify shaft compatibility, gear engagement, and proper alignment before operation.