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When your CNC router, robotic arm, or motor-driven mechanism demands smooth, low-noise power transfer, a poorly matched gear becomes the weakest link in the entire drivetrain. Engineers, makers, and automation builders who need reliable helical gear engagement without backlash-induced vibration will find this 1 modulus left-spiral stepped gear a dependable solution for demanding applications.
Each gear is machined from 45# carbon steel, offering a solid balance of tensile strength and machinability. The stepped hub design allows secure shaft mounting across bore diameters ranging from 6 mm (0.24 in) to 16 mm (0.63 in). Tooth counts span 13T, 15T, 20T, 26T, and 30T — covering a wide range of gear ratios for speed reduction or torque multiplication. The 45° left-hand helix angle ensures gradual tooth engagement, reducing impact load and operating noise compared to straight-cut spur gears.
Typical use cases include DC motor output shafts in tabletop CNC machines, stepper-driven axis drives in 3D printer extruder assemblies, and paired helical gear sets in custom gearbox builds for robotics competitions or industrial automation prototypes. The consistent 1-modulus pitch makes cross-pairing with standard metric gear racks and mating gears straightforward.
Machined from 45# medium-carbon steel for reliable strength under continuous rotational load, suitable for motor transmission and automation drivetrain applications.
The left-spiral 45° helix promotes gradual tooth engagement, distributing load across multiple teeth simultaneously to reduce noise and vibration in high-speed drives.
The integrated step on the hub provides a positive axial stop for shaft positioning, simplifying assembly and improving concentricity in tight-tolerance builds.
Five tooth count options — 13, 15, 20, 26, and 30 teeth — let you dial in the gear ratio needed for your specific speed-torque requirement without custom machining.
Seven bore sizes from 6 mm to 16 mm accommodate a wide variety of motor and gearbox output shafts, reducing the need for adapter sleeves or custom boring.
The 1M pitch is fully compatible with standard metric gear racks and mating gears, making integration into existing 1-modulus drivetrain systems straightforward and repeatable.
| Module | 1 |
|---|---|
| Helix Angle | 45° |
| Helix Direction | Left (Left Spiral) |
| Tooth Count Options | 13T / 15T / 20T / 26T / 30T |
| Bore Diameter Options | 6 mm / 8 mm / 10 mm / 12 mm / 14 mm / 15 mm / 16 mm |
| Material | 45# Carbon Steel |
| Hub Style | Stepped Hub |
| Pitch System | Metric (1 Modulus) |
| Surface Finish | See variant options |
| Overall Diameter | See variant options |
| Face Width | See variant options |
| Keyway | See variant options |
| Set Screw | See variant options |
| Weight | See variant options |
Select the tooth count based on your required gear ratio. Pair a lower tooth count (e.g., 13T or 15T) on the driving shaft with a higher tooth count on the driven shaft for speed reduction and torque increase. For a 1:1 ratio, use matching tooth counts on both gears. Refer to your drivetrain's speed and torque requirements to determine the ideal pairing.
Measure your motor or gearbox output shaft diameter precisely with calipers. Select the bore size that matches your shaft — available in 6, 8, 10, 12, 14, 15, and 16 mm. If your shaft has a keyway, confirm whether the bore includes a matching keyway slot before ordering.
Yes. This gear uses a standard 1 modulus (1M) metric pitch, which is compatible with any 1M metric gear rack or mating helical gear of the same module. Ensure the mating gear also uses a left-hand helix if you need parallel-axis engagement, or a right-hand helix for crossed-axis configurations.
45# carbon steel (equivalent to AISI 1045) has a tensile strength typically in the range of 600–800 MPa in normalized condition, making it well-suited for moderate-to-high load motor transmission applications. It offers a good balance of machinability and mechanical strength for CNC, robotics, and automation drivetrain use.
Yes — helix direction matters for parallel-axis gear pairs. Two mating gears on parallel shafts must have opposite helix hands (one left, one right) to mesh correctly. If you are replacing an existing gear, confirm the helix direction of the mating gear before ordering. For crossed-axis or worm-style configurations, consult your drivetrain design specifications.
The stepped hub features a shoulder (step) machined into the hub body that acts as a positive axial stop when the gear is pressed or slid onto a shaft. This simplifies assembly by providing a consistent reference position, improving concentricity and reducing the chance of misalignment during installation — particularly useful in precision CNC and robotics builds.
The 45° helical tooth form is well-suited for higher-speed applications compared to straight-cut spur gears, as the gradual tooth engagement reduces impact load and noise. Actual maximum speed depends on your lubrication, shaft support (bearing arrangement), and load conditions. For sustained high-speed use, ensure adequate lubrication and proper shaft alignment.
