Plastic Spur Gear 38mm 57 Teeth For Robotic & DIY Project

The Plastic Spur Gear 38mm 57 Teeth is a yellow plastic spur gear with 38mm outer diameter, 57 teeth, and 50g weight, designed for robotics and DIY gear reduction builds. This spur gear has the highest tooth density of any gear in StemVolt’s spur gear lineup — 57 teeth on a 38mm body gives a tooth-per-millimeter ratio significantly higher than any other gear in the range, which corresponds to a finer effective tooth pitch and smaller individual tooth size that produces noticeably smoother mesh engagement during rotation.

This 38mm spur gear’s 57-tooth count enables meaningful gear reductions while keeping the gear body compact — paired with the 15-tooth pinion gear from the lineup, it produces 57:15 = reduction, bringing output speed to about a quarter of motor speed while multiplying torque proportionally, all within a 38mm driven gear footprint that fits chassis designs where larger 55mm to 80mm gears would not have clearance.

the smaller individual tooth size that gives this 57 teeth spur gear its smooth mesh also means each tooth has less cross-section area and therefore lower individual tooth strength — pushing this gear beyond moderate torque loads risks tooth stripping. Available from StemVolt, offering quality robotics parts and DIY kits at competitive prices. This 38mm 57-tooth plastic spur gear is ideal for robotics projects, DIY builds, gear transmission systems, and educational mechanical applications.

Related Products:

• Checkout Plastic Spur Gear 60mm 38 Teeth

Features:

• Highest tooth density in lineup — 57 teeth on 38mm compact body
• Finer tooth pitch gives smoother mesh than coarser larger gears
• 3.8:1 reduction with 15T pinion in a compact 38mm footprint
• 50g lightweight yellow plastic for robotics chassis builds
• Parallel shaft spur tooth profile for standard gear train use

Technical Specifications:

Applications:

• Spur Gear used for compact chassis space-limited reduction build
• College project uses 38mm spur gear for tooth density comparison
• India robot uses plastic spur gear 38mm for tight clearance drive
• DIY arm uses 57 teeth spur gear for fine-pitch torque joint build
• Motorized slider uses spur gear for robotics for compact drive stage

Package Includes:

• 1 × Plastic Spur Gear 38mm 57 Teeth