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When your project demands a reliable right-angle or angled power transmission and off-the-shelf gears keep letting you down, you need a bevel gear engineered to spec. These Mod 1 bevel gears are designed for hobbyists, makers, and engineers who need consistent tooth engagement, accurate bore sizing, and a durable finish that holds up in real-world conditions. Whether you're building a CNC axis, a custom gearbox, or a robotics drivetrain, getting the gear ratio and bore fit right the first time matters.
Each gear is machined from C45 medium-carbon steel and treated with a hardened black oxide finish for corrosion resistance and reduced surface friction. Available in two tooth counts — 20 tooth and 25 tooth — forming a 1:1.25 gear ratio pair. Bore sizes range from 6mm to 12mm (approximately 0.24" to 0.47"), with a Module (Mod) value of 1. Outer diameter varies by tooth count: the 20-tooth gear measures approximately 22mm (~0.87"), and the 25-tooth gear approximately 27mm (~1.06").
Typical use cases include DIY power transmission systems requiring a compact bevel gear set, robotics joint drives where a 1:1.25 speed reduction is needed, and light industrial machinery upgrades where a hardened steel bevel gear with a standard metric bore is required. These gears are also well-suited for 3D printer Z-axis drives, RC vehicle differentials, and custom automation rigs.
Conforms to the Mod 1 metric gear standard, ensuring compatibility with other Mod 1 components in your drivetrain or gearbox assembly.
Machined from C45 medium-carbon steel — a widely used engineering material offering a solid balance of machinability, tensile strength, and wear resistance for mechanical drive applications.
Surface-hardened with a black oxide treatment that improves corrosion resistance, reduces light reflection, and lowers surface friction for smoother meshing under load.
The 20-tooth and 25-tooth gears are designed to work together as a matched bevel pair, delivering a precise 1:1.25 speed reduction or increase depending on drive direction.
Available with bore diameters of 6mm, 8mm, 10mm, and 12mm to fit a wide range of standard metric shafts — no custom machining required for most common shaft sizes.
Order in quantities of 1, 2, 3, 4, 5, or 10 pieces to match your project needs — whether you need a single replacement gear or a batch for a production run.
| Module (Mod) | 1 |
|---|---|
| Gear Ratio | 1:1.25 (20T drives 25T) |
| Tooth Counts Available | 20 Tooth / 25 Tooth |
| Bore Sizes Available | 6mm / 8mm / 10mm / 12mm |
| Material | C45 Medium-Carbon Steel |
| Surface Treatment | Hardened Black Oxide |
| Outer Diameter (20T) | Approx. 22mm (~0.87") |
| Outer Diameter (25T) | Approx. 27mm (~1.06") |
| Pressure Angle | See variant options |
| Face Width | See variant options |
| Shaft Fit Type | See variant options |
| Pack Quantities | 1 / 2 / 3 / 4 / 5 / 10 pcs |
The 20-tooth and 25-tooth gears are designed as a matched pair for a 1:1.25 ratio. If you need to reduce speed (and increase torque), drive the 20-tooth gear and let the 25-tooth gear be the output. If you need to increase speed (and reduce torque), reverse the arrangement. For a 1:1 ratio, you would need two gears of the same tooth count, which is a different product.
Select the bore size that matches your shaft diameter exactly. Available options are 6mm, 8mm, 10mm, and 12mm. For a secure fit, the bore should match the shaft with minimal clearance. If your shaft has a keyway, confirm whether the gear bore is also keyed before ordering — contact us to confirm keyway availability for your specific variant.
C45 steel is a medium-carbon engineering steel with a tensile strength typically in the range of 600–800 MPa depending on heat treatment. The hardened black oxide surface further improves wear resistance. These gears are suitable for light-to-medium duty mechanical drives, robotics, CNC machines, and DIY automation. For heavy industrial loads or high-RPM continuous duty, consult the load ratings with your mechanical engineer.
The black oxide surface treatment provides a degree of corrosion resistance compared to bare steel, but black oxide alone is not a fully waterproof coating. For outdoor or high-humidity environments, we recommend applying a light machine oil or grease to the gear teeth and bore after installation to extend service life.
Yes, you can purchase either the 20-tooth or the 25-tooth gear individually. Each variant is sold separately. If you need a complete 1:1.25 bevel gear pair, simply add one of each tooth count to your cart, making sure the bore sizes match your respective shafts.
The Module (Mod) number defines the size of the gear teeth — specifically, it is the ratio of the pitch diameter to the number of teeth. Mod 1 gears have relatively small teeth and are common in light-duty and precision applications. Gears of different modules cannot mesh together. Always confirm that all gears in your drivetrain share the same module number.
Yes — this listing offers quantity options of 1, 2, 3, 4, 5, and 10 pieces per order. The per-unit price decreases as quantity increases, so selecting a larger pack is the most cost-effective way to stock up for a project or production run. Select your preferred quantity in the Amount option above.
