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When your project demands a gear that fits exactly right and holds up under load, a mismatched or undersized spur gear can bring everything to a halt. Whether you are building a CNC machine, a robotic arm, a custom RC drivetrain, or a motorized DIY mechanism, this Mod1.5 steel spur gear gives engineers, makers, and hobbyists a dependable solution with a wide selection of tooth counts and bore sizes.
Each gear is machined from carbon steel and finished with a blackening (oxide) treatment for corrosion resistance and a clean, professional appearance. The tooth count ranges from 12T to 100T, and bore diameters span 4 mm (approx. 0.16 in) to 25 mm (approx. 0.98 in), including keyhole variants for keyed shaft applications. A set screw is included to secure the gear firmly to the shaft.
Typical use cases include spur gear reduction stages in 3D printer extruder drives, gear rack and pinion linear actuators, small industrial conveyor drives, and custom robotics joint assemblies — anywhere a Mod1.5 pitch gear is specified.
Available from 12T to 100T, covering a broad range of gear ratios for speed reduction or torque multiplication in your drive system.
Bore options from 4 mm to 25 mm, plus keyhole variants (e.g. 8×3×1.4 mm, 10×4×1.8 mm, 12×5×2.3 mm) for keyed shaft compatibility.
Carbon steel body with oxide blackening treatment provides corrosion resistance and reduces light reflection in precision assemblies.
Each gear ships with a set screw for secure shaft mounting without additional hardware, saving time during assembly.
Conforms to the Mod1.5 metric gear standard, ensuring accurate meshing with compatible racks, pinions, and mating gears.
Suitable for robotics, CNC machines, RC vehicles, 3D printers, conveyor systems, and custom DIY mechanical projects requiring reliable power transmission.
| Module (Mod) | 1.5 |
|---|---|
| Tooth Count | 12T – 100T (see variant options) |
| Bore Diameter | 4 mm – 25 mm; keyhole variants available (see variant options) |
| Material | Carbon Steel |
| Surface Treatment | Blackening (oxide treatment) |
| Fastening | Set screw included |
| Pressure Angle | 20° (standard) |
| Pitch Diameter | See variant options (Mod × Teeth) |
| Quantity per Order | 1 PCS |
The tooth count determines your gear ratio. Divide the driven gear teeth by the driving gear teeth to get the ratio. For example, a 12T pinion driving a 60T gear gives a 5:1 reduction. Choose a smaller tooth count for higher speed output and a larger count for more torque.
Select the bore diameter that matches your shaft diameter exactly. For round shafts, choose the plain bore (e.g. 8 mm, 10 mm). For keyed shafts, select the keyhole variant that matches your key dimensions (e.g. 8×3×1.4 mm means 8 mm bore with a 3 mm wide × 1.4 mm deep keyway).
These gears are machined from carbon steel, which offers good tensile strength and wear resistance for moderate-duty applications such as robotics, CNC, and RC drivetrains. For continuous heavy industrial loads, verify the gear's rated torque against your application requirements.
The oxide blackening treatment provides a degree of corrosion resistance and is suitable for indoor and low-humidity environments. For outdoor or high-moisture applications, applying a light machine oil or grease to the gear surface is recommended for additional protection.
Yes. Any Mod1.5 gear or rack with a matching 20° pressure angle will mesh correctly with these gears. Confirm the module and pressure angle of your existing components before ordering to ensure compatibility.
The included set screw is suitable for most light-to-medium duty applications. For high-torque or high-vibration environments, consider using a keyhole bore variant with a matching key, or applying thread-locking compound to the set screw for additional security.
Yes. Mod1.5 steel spur gears are commonly used in 3D printer extruder drives, CNC axis drives, and similar precision motion applications. Select the tooth count and bore size that match your motor shaft and desired gear ratio.
