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When your RC car, CNC router, or custom gearbox demands a gear that won't slip, strip, or wobble under load, the wrong module or bore size costs you the whole build. This 1.5 Mod spur gear pinion is engineered for makers, hobbyists, and mechanical engineers who need a reliable, drop-in transmission component across a wide range of tooth counts and shaft diameters.
Each gear is machined from 45# carbon steel, offering a solid balance of hardness and machinability. The stepped bore design accommodates a set screw for positive shaft locking. Tooth counts range from 12T to 50T (this listing), with bore sizes from 5mm (~0.197 in) up to 25mm (~0.984 in), covering the most common motor and shaft diameters used in DIY power transmission.
Typical applications include RC vehicle drivetrain upgrades, 3D printer extruder gear replacements, small conveyor systems, and custom robotic arm joints — anywhere a 1.5 module standard spur gear is specified. The consistent 1.5M pitch makes these gears directly meshable with any other 1.5 module rack, pinion, or mating gear in your system.
Available from 12T to 50T in this listing, letting you dial in the exact gear ratio your drivetrain requires without custom machining.
The stepped bore profile and set screw flat allow secure shaft locking, preventing rotational slip under torque — critical for motor pinions and drive gears.
Machined from 45# medium-carbon steel for a reliable combination of wear resistance and toughness across typical DIY and light industrial duty cycles.
Fully compatible with any 1.5M standard gear system — racks, mating spur gears, and gearboxes — for straightforward integration into existing builds.
Bore options from 5mm to 25mm cover the most common motor shaft and drive shaft diameters, including 5, 6, 6.35, 7, 8, 10, 12, 14, 15, 16, 17, 20, and 25mm.
Suited for RC vehicles, robotics, CNC machines, 3D printers, conveyor systems, and any custom mechanical build requiring a standard 1.5M spur gear pinion.
| Module (Mod) | 1.5 |
|---|---|
| Tooth Count (T) | 12T, 15T, 20T, 25T, 30T, 35T, 40T, 50T (see variant options) |
| Bore Size | 5mm, 6mm, 6.35mm, 7mm, 8mm, 10mm, 12mm, 14mm, 15mm, 16mm, 17mm, 20mm, 25mm (see variant options) |
| Material | 45# Carbon Steel |
| Pressure Angle | 20° |
| Gear Type | Spur Gear (Pinion) |
| Bore Style | Stepped bore with set screw flat |
| Pitch Diameter | See variant options |
| Face Width | See variant options |
| Finish | Natural steel (uncoated) |
| Weight | See variant options |
The tooth count determines your gear ratio. Divide the driven gear's tooth count by the driving pinion's tooth count to get the ratio. A smaller pinion (e.g., 12T) paired with a larger gear produces more torque and less speed; a larger pinion (e.g., 50T) produces more speed and less torque. Match the tooth count to your required output speed and torque.
Measure your motor shaft or drive shaft diameter with a caliper. Select the bore size that matches exactly — for example, a 5mm motor shaft requires the 5mm bore variant. The stepped bore includes a set screw flat for secure locking. If your shaft is imperial (e.g., 1/4"), the 6.35mm bore is the closest metric equivalent.
Yes. Any gear or rack marked as 1.5 Module (Mod 1.5 or M1.5) with a standard 20° pressure angle will mesh correctly with these pinions. Confirm the module and pressure angle of your mating component before ordering.
45# carbon steel is a medium-carbon steel widely used for mechanical gears in light to moderate duty applications — including RC drivetrains, robotics, 3D printers, and small conveyor systems. For heavy industrial or high-shock-load applications, consider hardened or alloy steel alternatives. For typical DIY and hobbyist use, 45# steel provides reliable performance.
These gears are supplied in a natural steel finish without coating. For outdoor or humid environments, applying a light machine oil or grease to the tooth faces will help prevent surface oxidation and extend service life. For enclosed gearboxes, standard gear grease is recommended.
For a 1.5 Module gear, the pitch diameter equals the tooth count multiplied by the module: PD = T × 1.5mm. For example, a 12T gear has a pitch diameter of 18mm (~0.71 in), while a 50T gear has a pitch diameter of 75mm (~2.95 in). Choose based on the physical space available in your build as well as your gear ratio requirements.
Yes. These 1.5M spur gear pinions are commonly used in 3D printer extruder drives, CNC axis drives, and similar precision motion applications where a standard module gear is specified. Verify that your existing rack or mating gear is also 1.5 Module before ordering.
