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When a stripped or mismatched gear brings your CNC router, 3D printer, or robotic arm to a halt, finding the exact modulus and tooth count fast is critical. This listing is designed for makers, engineers, and hobbyists who need a reliable, dimensionally accurate spur gear without hunting across multiple suppliers.
These steel spur gears are machined from carbon steel and are available in four modulus options — 1M, 1.5M, 2M, and 2.5M — with tooth counts ranging from 10 to 150 teeth. Outer diameters span approximately 14 mm (0.55 in) up to 152 mm (5.98 in), and gear thickness is typically 10–25 mm (0.39–0.98 in) depending on the selected variant. Each listing ships as 1 piece per order.
Typical use cases include replacement drive gears for desktop CNC machines, pinion gears in 3D printer extruder and motion systems, gear train components in robotics and automation rigs, and custom mechanical assemblies requiring standard metric modulus gearing.
| Material | Carbon Steel |
|---|---|
| Gear Type | Spur Gear (Pinion Gear) |
| Available Modulus | 1M / 1.5M / 2M / 2.5M |
| Tooth Count Range | 10 – 150 Teeth |
| Outer Diameter Range | 14 mm – 152 mm (0.55 in – 5.98 in) |
| Gear Thickness | Typically 10 – 25 mm (0.39 – 0.98 in) |
| Bore Diameter | See variant options |
| Pressure Angle | See variant options |
| Surface Finish | See variant options |
| Packing Quantity | 1 Piece per order |
| Weight | See variant options |
The modulus must match the gear it will mesh with. Measure the outer diameter (OD) of your existing gear and count the teeth, then calculate: Modulus = OD ÷ (Teeth + 2). Common modulus values for desktop CNC and 3D printers are 1M and 1.5M; larger industrial or robotics applications often use 2M or 2.5M. When in doubt, check your machine's documentation or contact us with your measurements.
Gear ratio is determined by dividing the driven gear tooth count by the driving (pinion) gear tooth count. For example, a 30-tooth gear driving a 60-tooth gear gives a 2:1 reduction. Select the tooth count that achieves your target ratio when paired with your existing gear. This listing covers 10–150 teeth, giving you flexibility for both high-speed and high-torque configurations.
These gears are machined from carbon steel, which provides solid strength for typical CNC motion systems, 3D printer drives, and light-to-medium robotics applications. For heavy-duty industrial loads or continuous high-torque environments, please contact us to confirm suitability for your specific load requirements before ordering.
Carbon steel has moderate corrosion resistance. For indoor CNC, 3D printing, or dry robotic environments, the material performs well under normal operating conditions. If your application involves moisture, coolant exposure, or outdoor use, consider applying a light machine oil or protective coating after installation to extend service life.
Bore diameter varies by variant and is not listed in the product title. Please contact us with your required shaft diameter before placing your order so we can confirm compatibility. Providing your shaft OD in millimeters will allow us to give you an accurate answer quickly.
Yes. The 1M and 1.5M modulus variants with smaller tooth counts (typically 12–20 teeth) are commonly used in 3D printer extruder drives and linear motion systems. Verify the outer diameter and bore diameter match your printer's existing gear specifications before ordering. The precise OD listed per variant makes it straightforward to cross-reference against your printer's BOM or spare parts list.
Each variant is packaged and sold as 1 piece per order. To order multiple pieces, simply increase the quantity at checkout. If you need bulk quantities for a production run or project, contact us for availability and volume options.
