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When your CNC router, robotic arm, or custom drive system needs to change shaft direction without losing torque, a mismatched or low-grade bevel gear pair becomes the weakest link in the entire mechanism. These 1:1 spiral bevel gear sets are sold as matched pairs (2 pcs per set) and are engineered for builders, machine designers, and automation engineers who need reliable 90° power transmission with consistent tooth engagement.
Each set consists of two identical spiral bevel gears machined from steel, available in module sizes 1, 1.5, 2, 2.5, and 3, with tooth counts of 20T, 25T, or 30T. Bore options range from 6 mm (0.24 in) up to 25 mm (0.98 in), with keyway configurations available from 1.5M and above for positive shaft locking. Overall gear outer diameter ranges from approximately 22 mm (0.87 in) for 1M 20T up to approximately 96 mm (3.78 in) for 3M 30T, depending on the selected module and tooth count.
Typical use cases include right-angle gearbox assemblies for CNC axis drives, spiral bevel gear pair for robotics joint actuation, 90-degree power transmission in custom automation rigs, and matched bevel gear sets for DIY lathe or milling machine builds. The spiral tooth geometry provides smoother engagement and lower noise compared to straight bevel gears, making these sets well-suited for continuous-duty applications.
Each order ships as a matched set of two identical spiral bevel gears, ensuring consistent tooth geometry and backlash control right out of the box — no pairing guesswork required.
Five module sizes cover light-duty precision drives (1M) through heavy-duty industrial applications (3M), giving you the flexibility to match torque and speed requirements across a broad range of builds.
From 1.5M upward, bore options include machined keyway slots (4 mm, 5 mm, 6 mm, or 8 mm depending on bore size), eliminating shaft slip under load without additional set-screw modifications.
The helical spiral tooth profile distributes load across multiple teeth simultaneously, reducing vibration and operating noise compared to straight bevel gears — critical for precision CNC and robotic applications.
Machined from steel stock, these gears handle the mechanical stresses of continuous-duty right-angle drives. The material provides the hardness and wear resistance needed for long service life in demanding environments.
Both right-hand and left-hand spiral directions are available across the range, allowing you to select the correct hand for your specific drive configuration and rotation requirements.
| Gear Type | Spiral Bevel Gear (Matched Pair) |
|---|---|
| Ratio | 1:1 |
| Module | 1 / 1.5 / 2 / 2.5 / 3 (see variant options) |
| Tooth Count | 20T / 25T / 30T (see variant options) |
| Bore Diameter | 6 mm – 25 mm (see variant options) |
| Keyway | Available on 1.5M and above (see variant options) |
| Spiral Direction | Right-hand & Left-hand |
| Material | Steel |
| Pressure Angle | See variant options |
| Outer Diameter (approx.) | See variant options |
| Pack Quantity | 1 Set (2 pcs) |
| Shaft Fit | Metric standard bore |
Module size determines the physical tooth size and load capacity. Smaller modules (1M, 1.5M) suit light-duty precision drives such as instrument mechanisms or small CNC axes. Larger modules (2M, 2.5M, 3M) are appropriate for higher-torque applications like lathe drives or heavy robotic joints. As a general rule, match the module to the torque load and shaft diameter — larger shafts typically pair with larger modules.
A plain bore (or "process hole") is a smooth cylindrical hole that you can finish-machine to your exact shaft size. A keyway bore includes a pre-cut slot that accepts a standard key, providing a positive mechanical lock between the gear and shaft to prevent rotational slip under load. Keyway options are available on 1.5M and larger modules. For high-torque or reversing-load applications, keyway bores are strongly recommended.
Yes. The steel construction and spiral tooth geometry distribute load across multiple teeth simultaneously, which reduces peak stress per tooth compared to straight bevel gears. This makes them suitable for continuous-duty right-angle drives in CNC machines, automation equipment, and robotic systems. For very high-speed or extreme-load applications, confirm the specific module and tooth count against your torque and speed requirements.
No. Each listing is sold as a matched 1:1 pair (2 pcs per set) of the same hand. A right-hand spiral bevel gear meshes with another right-hand spiral bevel gear at 90°, and the same applies to left-hand pairs. Select the spiral direction that matches your drive configuration. If you are unsure which hand you need, check the rotation direction of your input and output shafts.
These gears are machined from steel and do not have a corrosion-resistant coating specified. For use in humid, wet, or outdoor environments, we recommend applying a suitable gear lubricant or anti-corrosion grease, or considering a protective coating after installation. For highly corrosive environments, contact us to discuss material alternatives.
The bore sizes listed are metric (mm). If you are using an imperial shaft, you will need to select the "Process hole" bore option and finish-machine the bore to your exact imperial shaft diameter. Alternatively, check if a listed metric bore is close enough to your shaft size to use with a sleeve adapter. Contact us if you need guidance on bore-to-shaft matching.
"Process hole" means the gear is supplied with a pilot bore (a small reference hole) that you finish-machine to your required shaft diameter and keyway specification. This option gives machinists and engineers the flexibility to achieve a precise fit for non-standard shaft sizes or custom keyway dimensions. It is the recommended choice if your shaft size does not match any of the listed standard bore options.
