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When your build demands a reliable 90° power transfer without the weight and noise of metal gears, finding a matched bevel gear pair that fits your exact shaft can be a real challenge. Engineers, robotics hobbyists, and DIY machine builders who need a lightweight, low-backlash drive solution will find this straight bevel gear set a dependable choice across a wide range of applications.
Each set consists of two matched straight bevel gears machined from engineering-grade blue nylon, delivering a 1:1 transmission ratio. Available in Module 1, 1.5, 2, and 2.5, with tooth counts ranging from 15 to 30 teeth, and outer diameters spanning approximately 15–75 mm (0.59–2.95 in) depending on the selected module and tooth count. Bore sizes range from 4 mm to 25 mm (0.16–0.98 in), with optional integrated keyways (3–8 mm) for positive shaft locking.
Typical use cases include DIY CNC router axis drives requiring quiet operation, small robotic arm joint mechanisms where weight reduction is critical, and custom automation conveyor corner drives where a straight bevel gear pair for 90-degree shaft redirection is needed without lubrication complexity.
| Gear Type | Straight Bevel Gear (Matched Pair, 1:1 Ratio) |
|---|---|
| Material | Engineering-Grade Nylon |
| Color | Blue |
| Available Modules | Module 1 / Module 1.5 / Module 2 / Module 2.5 |
| Tooth Count (per gear) | 15 / 16 / 20 / 25 / 30 Teeth |
| Transmission Ratio | 1:1 |
| Bore Diameter Range | 4 mm – 25 mm (0.16 – 0.98 in) |
| Keyway Options | 3 mm / 4 mm / 5 mm / 6 mm / 8 mm (variant dependent) |
| Outer Diameter (approx.) | See variant options |
| Face Width (approx.) | See variant options |
| Pressure Angle | 20° (standard straight bevel) |
| Shaft Angle | 90° |
| Lubrication Required | None (self-lubricating nylon) |
| Package Contents | 1 Matched Pair (2 Gears) |
| Weight | See variant options |
The module determines the gear tooth size and load capacity — a higher module (e.g., Module 2.5) means larger, stronger teeth suited for higher torque. The tooth count affects the gear's outer diameter: more teeth = larger gear. For compact, light-load builds (robotics, small automation), Module 1 or 1.5 with 15–20 teeth is typically sufficient. For heavier DIY machinery, Module 2 or 2.5 with 25–30 teeth provides greater strength. Both gears in this set always share the same module and tooth count for a 1:1 ratio.
A plain bore (no keyway) is suitable for light-duty or low-torque applications where the gear is secured with a set screw or adhesive. If your application involves significant torque, reversing loads, or frequent start-stop cycles, a keyway bore is strongly recommended. The keyway provides a positive mechanical lock between the gear and shaft, preventing rotational slippage. Match the keyway size to the standard key size for your shaft diameter.
These gears are manufactured from engineering-grade nylon, which is well-suited for light-to-medium duty applications. Nylon gears are not recommended for high-torque industrial drives or continuous heavy-load operation. They perform best in robotics, small automation, DIY CNC, and hobby machinery where quiet, lubrication-free operation is prioritized over maximum load capacity. For heavy-duty requirements, consider metal bevel gear alternatives.
Yes — nylon is inherently resistant to moisture, mild chemicals, and corrosion, making these gears suitable for use in damp or humid environments where metal gears would rust. However, prolonged submersion in water or exposure to strong solvents is not recommended, as nylon can absorb moisture over time, which may cause slight dimensional changes. For outdoor or wet-area applications, nylon bevel gears are a practical choice over uncoated steel.
In principle, gears of the same module and pressure angle (20°) can mesh regardless of material. However, mixing nylon and metal bevel gears in a pair is generally not recommended for sustained operation, as the harder metal gear will accelerate wear on the nylon gear. For best results and longest service life, use both gears from this matched nylon pair together as supplied.
Use a digital caliper to measure the outer diameter of your shaft at the point where the gear will be mounted. Select the bore size that matches your shaft diameter exactly — the bore should be a close sliding fit, not loose. If your shaft has a flat (key seat), measure the shaft diameter across the full round section and select the corresponding keyway bore variant. Avoid selecting a bore size larger than your shaft diameter, as this will result in excessive play and potential gear misalignment.
Each order includes one matched pair — that is, two bevel gears of the same module and tooth count, ready to mesh together at 90°. You do not need to purchase the mating gear separately. Simply select your required module, tooth count, and bore size from the variant options above, and both gears will be included in your shipment.
