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When your drivetrain needs to change direction without losing torque, a mismatched or worn bevel gear becomes the weakest link in the entire system. Engineers, robotics builders, and serious DIY machinists who demand repeatable, low-backlash motion need a gear that holds its geometry under load — not one that wears out after a few hundred cycles. These bevel gears are engineered for makers and mechanical professionals who refuse to compromise on dimensional accuracy.
Each bevel gear is machined from 45# medium-carbon steel and features hardened teeth for extended wear life. The range spans Modulus 0.5 through 4 (pitch equivalent approximately 50.8 DP down to 6.35 DP), tooth counts from 15T to 40T, and bore diameters from 6 mm (0.24 in) up to 18 mm (0.71 in), with overall gear diameters scaling from approximately 7.5 mm (0.30 in) for the smallest 0.5 Mod 15T up to roughly 160 mm (6.30 in) for the largest 4 Mod 40T. All variants are configured for a 1:1 transmission ratio, meaning the mating gear pair shares identical tooth count and modulus.
Typical applications include right-angle shaft drives in CNC router Z-axis assemblies, bevel-gear differentials for RC and hobby vehicles, rotary indexing tables, custom conveyor corner drives, and compact robotic joint actuators where a 90-degree power transfer is required with minimal axial footprint.
Machined from 45# steel — a widely used medium-carbon grade known for its balance of machinability, tensile strength (typically 600–800 MPa), and response to heat treatment — giving each gear a solid, dense body that resists deformation under cyclic loading.
Tooth surfaces undergo hardening treatment to increase surface hardness and resist pitting, spalling, and abrasive wear — extending service life significantly compared to unhardened gears in the same material class.
Seven modulus steps (0.5, 1, 1.5, 2, 2.5, 3, 4) let you match the gear to your torque and speed requirements. Smaller modulus suits high-speed, low-torque applications; larger modulus handles heavier loads with coarser tooth geometry.
Both gears in the mating pair share the same tooth count, delivering a true 1:1 speed and torque ratio at the 90-degree shaft intersection — ideal for direction-change drives where output speed must equal input speed.
Bore diameters are matched to each modulus and tooth count combination (6 mm, 8 mm, 10 mm, 12 mm, 15 mm, 16 mm, 18 mm available across the range), reducing the need for custom shaft adapters and simplifying direct-mount installation on standard shaft stock.
With tooth counts from 15T to 40T across modulus groups, you can fine-tune the pitch diameter and contact ratio for your specific center distance and load distribution requirements — whether you are building a compact robot joint or a larger industrial-style indexer.
| Material | 45# Medium-Carbon Steel |
|---|---|
| Tooth Treatment | Hardened (surface hardening) |
| Modulus Range | 0.5 / 1 / 1.5 / 2 / 2.5 / 3 / 4 |
| Tooth Count Range | 15T – 40T (varies by modulus) |
| Transmission Ratio | 1:1 |
| Shaft Angle | 90° |
| Bore Diameter Range | 6 mm – 18 mm (see variant options) |
| Pressure Angle | See variant options |
| Pitch Diameter | See variant options |
| Face Width | See variant options |
| Surface Finish | See variant options |
| Quantity per Order | 1 piece (single gear) |
Modulus determines tooth size and load capacity. Smaller modulus (0.5–1) suits lightweight, high-speed applications such as small robotics or instrumentation drives. Medium modulus (1.5–2.5) covers most hobbyist CNC and RC vehicle builds. Larger modulus (3–4) is appropriate for heavier-duty drives where tooth strength and load distribution are the primary concern. As a rule of thumb, select the smallest modulus that keeps tooth bending stress within your material's allowable range.
Yes. Each listing sells one individual gear. For a functional 1:1 bevel gear pair, you need to purchase two gears of the same modulus and the same tooth count. Both gears are identical in this 1:1 configuration, so you can simply add two of the same variant to your cart.
45# steel has a typical tensile strength of 600–800 MPa and yield strength around 355 MPa in normalized condition. With surface hardening applied to the tooth flanks, contact fatigue resistance is substantially improved. Actual load capacity depends on modulus, tooth count, operating speed, lubrication, and duty cycle. For critical load calculations, apply AGMA or ISO 6336 bending and contact stress methods using the specific gear geometry of your chosen variant.
45# steel is not inherently corrosion-resistant. For outdoor, humid, or wash-down environments, apply a suitable lubricant or protective coating (e.g., grease, anti-rust spray, or zinc-based primer) and consider periodic maintenance. If corrosion resistance is a primary requirement, stainless steel or plastic bevel gears may be a better fit for your application.
Select the bore size that matches your shaft diameter. The bore sizes available vary by modulus and tooth count — smaller modulus variants typically offer 6 mm bores, while larger modulus variants scale up to 8 mm, 10 mm, 12 mm, 15 mm, 16 mm, and 18 mm. Check the Size variant label (e.g., "2Mod 20T Bore 10mm") to confirm the bore before ordering. If your shaft is metric, a direct fit is straightforward; for imperial shafts, verify the bore-to-shaft clearance carefully.
Yes. These gears are well-suited for CNC router axis drives, robotic joint actuators, rotary indexing tables, and custom automation builds where a 90-degree power transfer is needed. The hardened teeth provide the wear resistance required for repetitive motion cycles. Ensure the selected modulus and tooth count match your torque and speed envelope, and use appropriate lubrication (light gear grease or oil mist) for best longevity.
A 1:1 bevel gear pair uses two gears with the same tooth count, so input and output shafts rotate at the same speed — only the direction changes by 90°. A reduction bevel gear set uses gears with different tooth counts to step down (or up) speed and torque. This product is specifically a 1:1 ratio set, meaning both gears in the pair are identical. If you need a speed reduction, you would need a different gear ratio configuration.
