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When your CNC router, robotic arm, or automation rig demands a gear that won't slip, strip, or flex under load, finding the right spur gear in the exact module and tooth count can be a frustrating search. This listing covers 1 Mod, 1.5 Mod, and 2 Mod spur gears in 45# carbon steel, giving engineers, makers, and small-batch manufacturers a single source for the most common metric pinion gear sizes.
Each gear is machined from 45# medium-carbon steel, offering a balance of hardness and machinability suited to power-transmission applications. Tooth thickness ranges typically from 10 mm to 20 mm (0.39 in to 0.79 in) depending on the module and tooth count selected. Bore diameter and keyway dimensions vary by variant — see variant options for confirmed bore specs.
Typical use cases include CNC rack-and-pinion drive systems, 3D printer extruder and axis drives, robotic joint actuators, conveyor indexing mechanisms, and DIY gearbox builds where a standard metric spur gear is required. The wide tooth count range (12T to 150T) makes these gears suitable for both high-speed pinion stages and large-diameter driven gears in the same drivetrain.
Machined from 45# medium-carbon steel for solid load-bearing capacity and resistance to tooth deformation under sustained mesh loads in power-transmission applications.
Available in 1 Mod, 1.5 Mod, and 2 Mod — the three most common metric spur gear modules — so you can source matching pinion and driven gears from a single product page.
From compact 12-tooth pinions to large 150-tooth driven gears, this range covers most standard gear ratio requirements in CNC, robotics, and light industrial automation builds.
Gear face width typically falls in the 10–20 mm (0.39–0.79 in) range, providing adequate contact area for moderate torque transmission without excessive axial bulk.
Manufactured to standard 20° pressure angle geometry, ensuring interchangeability with other metric module gears of the same module from compatible suppliers.
Widely used in rack-and-pinion CNC axes, 3D printer drive trains, robotic joint actuators, and custom gearbox assemblies where a reliable metric spur gear is needed.
| Material | 45# Carbon Steel |
|---|---|
| Module (Mod) | 1 / 1.5 / 2 (see variant options) |
| Tooth Count | 12T – 150T (see variant options) |
| Pressure Angle | 20° |
| Tooth Thickness (Face Width) | Typically 10–20 mm (0.39–0.79 in) |
| Bore Diameter | See variant options |
| Keyway | See variant options |
| Surface Finish | See variant options |
| Gear Type | External Spur Gear |
| Application | CNC, robotics, automation, DIY gearbox |
| Amount | 1 Pcs per order (multi-pack options available) |
The module must match between meshing gears. If your existing rack or mating gear is 1 Mod, select 1 Mod here. If it is 1.5 Mod or 2 Mod, select accordingly. Mixing modules will result in incorrect mesh and rapid tooth wear. Check your existing gear's tooth pitch or consult the equipment's BOM to confirm the module before ordering.
Gear ratio = driven gear teeth ÷ driving gear (pinion) teeth. For example, a 60T driven gear paired with a 20T pinion gives a 3:1 reduction. Select the tooth counts that achieve your target ratio. For rack-and-pinion linear drives, the linear travel per revolution equals π × module × tooth count (in mm).
45# carbon steel provides solid tensile strength (typically 600–800 MPa depending on heat treatment) suitable for moderate torque transmission in CNC and robotics applications. For high-shock or continuous heavy-duty industrial loads, consider specifying heat-treated or alloy steel gears. Contact us to confirm load ratings for your specific application.
45# carbon steel has limited inherent corrosion resistance. For indoor, dry environments these gears perform well with standard lubrication. For humid, outdoor, or washdown environments, consider applying a rust-inhibiting grease or selecting stainless steel alternatives. Regular lubrication is recommended to extend service life.
Bore diameter varies by module and tooth count. Please refer to the variant options or contact us with your shaft diameter and keyway requirements before ordering. We can confirm the bore spec for the specific variant you need. Do not assume bore size from the tooth count alone.
No. Gears of different modules are not interchangeable and will not mesh correctly. The module must be identical between all meshing components in a gear pair or rack-and-pinion system. Always verify the module of your existing components before selecting a replacement or mating gear.
A medium-viscosity gear grease or oil suitable for carbon steel is recommended. Apply lubricant to the tooth flanks during installation and re-lubricate at regular service intervals based on load and duty cycle. Avoid dry running, which accelerates tooth wear on steel gears.
