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When your CNC router, robotic arm, or automation drive system demands consistent torque transfer without backlash surprises, the wrong gear ruins the whole build. Engineers and makers who need a stepped-hub spur gear in a wide range of tooth counts and bore sizes — without sourcing from multiple suppliers — will find exactly what they need here. These 1.5 module spur gears are designed for demanding motion-control applications where dimensional accuracy and material strength are non-negotiable.
Each gear is machined from 45# carbon steel, a medium-carbon alloy known for its balance of hardness and machinability. The module is 1.5M (metric), with tooth counts ranging from 15T to 50T and bore diameters spanning 5 mm to 25 mm (approximately 0.197 in to 0.984 in). The stepped hub design allows secure shaft mounting with a set screw, and the overall gear diameter scales proportionally with tooth count — from roughly 24 mm (~0.94 in) for 15T up to approximately 78 mm (~3.07 in) for 50T.
Typical use cases include stepper motor pinion drives in desktop CNC machines, servo-driven axis geartrains in 3D printer extruder assemblies, and reduction stages in conveyor or indexing automation systems. The 1.5 mod pitch is also widely used in RC vehicle drivetrains and small industrial gearboxes where a compact, robust gear is required.
Machined from medium-carbon 45# steel for a strong combination of surface hardness and core toughness, suitable for continuous-duty power transmission in mechanical drives.
Module 1.5 pitch ensures direct interchangeability with any standard Mod 1.5 mating gear, rack, or gearbox component — no custom adaptation required.
Covers a broad gear ratio spectrum in a single product line. Select the tooth count that matches your required speed reduction or torque multiplication ratio.
The stepped hub profile accommodates bore diameters from 5 mm to 25 mm, fitting a wide range of motor and shaft sizes. Set-screw mounting provides secure, slip-resistant attachment.
Available in 1, 3, 5, or 10-piece packs. Order a single gear for prototyping or stock up in bulk for production runs and spare-parts inventory.
Dimensionally consistent across the range, making these gears suitable for repeatable assembly in CNC routers, robotic joints, conveyor drives, and indexing mechanisms.
| Module | 1.5M (Metric) |
|---|---|
| Tooth Count | 15T, 20T, 25T, 30T, 35T, 40T, 50T (see variant options) |
| Bore Diameter | 5 / 6 / 6.35 / 7 / 8 / 10 / 12 / 14 / 15 / 16 / 17 / 20 / 25 mm (see variant options) |
| Material | 45# Carbon Steel |
| Hub Style | Stepped hub with set-screw bore |
| Pressure Angle | 20° (standard metric spur gear) |
| Pitch Diameter | Module × Teeth (e.g., 1.5 × 15 = 22.5 mm for 15T) |
| Surface Finish | See variant options |
| Mounting | Set screw (keyway: contact us to confirm per size) |
| Pack Quantity | 1 / 3 / 5 / 10 Pcs (see variant options) |
The gear ratio between two meshing gears equals the ratio of their tooth counts. For example, pairing a 15T pinion with a 30T gear gives a 2:1 reduction. Choose a lower tooth count (15T–20T) for higher speed output and a higher tooth count (40T–50T) for more torque. Match the module (1.5M) on both gears to ensure they mesh correctly.
The bore diameter must match your motor shaft or drive shaft diameter exactly. Common motor shaft sizes include 5 mm, 6 mm, 6.35 mm (1/4 inch), 8 mm, 10 mm, and 12 mm. Measure your shaft with calipers before ordering. The set screw secures the gear to the shaft — do not select a bore larger than your shaft diameter.
45# carbon steel provides a tensile strength of approximately 600–800 MPa depending on heat treatment. These gears are suitable for moderate-duty power transmission in CNC, robotics, and automation applications. For very high-torque or high-speed industrial drives, contact us to confirm suitability for your specific load conditions.
45# carbon steel has limited inherent corrosion resistance. For indoor, dry environments (typical for CNC machines and robotics), the material performs well with standard lubrication. For humid or outdoor environments, consider applying a light machine oil or grease to the gear teeth and bore area to prevent surface oxidation.
Yes — any gear or rack with a 1.5M module and a standard 20° pressure angle will mesh correctly with these gears. Module and pressure angle must match between mating components. If your existing gear uses a different module (e.g., 1.0M or 2.0M), these gears will not be compatible.
Yes. These 1.5 mod spur gears are commonly used in desktop CNC router axis drives, 3D printer extruder geartrains, and laser cutter motion systems. The stepped hub design makes them easy to mount on NEMA 17 or NEMA 23 stepper motor shafts (5 mm, 6.35 mm, and 8 mm bore options available). Select the bore that matches your motor shaft.
The pitch diameter of a spur gear equals Module × Tooth Count. For 1.5M gears: the 15T variant has a pitch diameter of 22.5 mm (~0.89 in), while the 50T variant has a pitch diameter of 75 mm (~2.95 in). The overall outside diameter is slightly larger than the pitch diameter. Choose based on the space envelope available in your design.
