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When your build demands a reliable right-angle power transfer without the weight penalty of metal, finding a matched bevel gear pair that fits your shaft and module spec can be a real challenge. Whether you're a robotics hobbyist, a CNC builder, or a mechanical engineering student, mismatched gears waste time and kill torque efficiency. These POM plastic bevel gear sets are sold as matched 1:1 pairs, ready to drop into your drivetrain.
Each set consists of two identical bevel gears machined from POM (polyoxymethylene) acetal, a self-lubricating engineering plastic known for its low friction, dimensional stability, and resistance to wear. Available in Module 1 and Module 1.5, with tooth counts of 20, 25, or 30 per gear, and bore sizes ranging from 5 mm (0.20 in) to 12 mm (0.47 in). The 90° mesh angle delivers a true miter configuration with a 1:1 speed and torque ratio between the two shafts.
Typical use cases include small robot joint drives requiring a 90° axis change, compact CNC axis gearboxes where a bevel miter gear pair replaces a worm stage, and DIY automation projects such as conveyor corner drives or camera pan-tilt mechanisms. Long-tail applications: POM miter gear pair for 3D printer extruder, plastic bevel gear set for RC model drivetrain, Module 1 bevel gear 20 tooth bore 8mm.
Both gears in the pair share the same tooth count and module, producing an exact 1:1 speed ratio and equal torque on both output shafts — ideal for direction-change drives with no speed reduction.
POM (Delrin-equivalent) offers a low coefficient of friction, excellent dimensional stability, and resistance to moisture and common solvents — no additional lubrication required for light-duty cycles.
Choose Module 1 (20T, 25T, 30T) or Module 1.5 (20T, 25T) to match your existing gear train pitch. Larger tooth counts increase the pitch diameter and spread load over more teeth.
Bore options from 5 mm to 12 mm (0.20–0.47 in) cover the most common metric motor and shaft diameters used in hobby robotics, small CNC machines, and DIY automation builds.
POM is significantly lighter than brass or steel bevel gears of the same size, reducing rotational inertia and making these gears well-suited for servo-driven or battery-powered applications.
Each order includes two gears pre-matched by module and tooth count, so you receive a complete, ready-to-install miter gear set without needing to source individual gears separately.
| Product Type | Bevel Miter Gear Set (Matched Pair) |
|---|---|
| Material | POM (Polyoxymethylene / Acetal) |
| Module (Mod) | Module 1 / Module 1.5 (see variant options) |
| Tooth Count (per gear) | 20T / 25T / 30T (see variant options) |
| Gear Ratio | 1:1 (miter) |
| Mesh Angle | 90° |
| Bore Diameter | 5 / 6 / 8 / 10 / 12 mm (see variant options) |
| Pressure Angle | 20° (standard) |
| Pitch Diameter (Mod 1 / 20T) | 20 mm (0.79 in) |
| Pitch Diameter (Mod 1 / 25T) | 25 mm (0.98 in) |
| Pitch Diameter (Mod 1 / 30T) | 30 mm (1.18 in) |
| Pitch Diameter (Mod 1.5 / 20T) | 30 mm (1.18 in) |
| Pitch Diameter (Mod 1.5 / 25T) | 37.5 mm (1.48 in) |
| Hub / Boss Diameter | See variant options |
| Keyway | None (plain bore) |
| Set Screw | See variant options |
| Quantity per Order | 2 gears (1 matched pair) |
| Color | Natural white / off-white (POM) |
The module determines the tooth size and pitch. Module 1 gears have smaller teeth and are suited for lighter loads and tighter spaces. Module 1.5 gears have larger teeth, handle higher torque, and are more forgiving of minor misalignment. Both modules must be matched — a Mod 1 gear will not mesh correctly with a Mod 1.5 gear. Check the module of your existing gear train before selecting.
Measure your motor or drive shaft diameter with a caliper. Available bore sizes are 5 mm, 6 mm, 8 mm, 10 mm, and 12 mm. For a secure fit, the bore should match your shaft diameter exactly. If your shaft is imperial (e.g., 1/4 in ≈ 6.35 mm), choose the next available metric size and use a shaft adapter or shim, or contact us to confirm fit.
POM acetal is a structural engineering plastic with a tensile strength of approximately 60–70 MPa and good fatigue resistance. These gears are well-suited for light-to-medium duty applications such as hobby robotics joints, small CNC axis drives, and automation mechanisms running at low-to-moderate speeds. For heavy industrial loads or continuous high-torque operation, metal bevel gears would be more appropriate.
Yes. POM has low water absorption and is resistant to many oils, fuels, and common solvents, making it suitable for environments where metal gears might corrode. It is not recommended for prolonged exposure to strong acids, bases, or UV radiation without protective measures.
Yes — as long as the mating gear shares the same module and tooth count, POM plastic gears can mesh with metal gears of the same specification. In mixed-material pairings, the POM gear typically acts as the sacrificial wear component, which can be advantageous for protecting more expensive metal parts.
POM is self-lubricating under light loads and does not require grease for normal operation. For higher speeds or loads, a light application of PTFE-based dry lubricant or white lithium grease can extend service life. Avoid petroleum-based oils that may degrade the plastic over time.
The tooth count (T) determines the pitch diameter of the gear. More teeth mean a larger gear diameter, which distributes load across more tooth contact area and generally runs more quietly. 20T is the most compact option; 30T (Mod 1) offers the largest pitch diameter and smoothest operation at the cost of more space. All options maintain the 1:1 miter ratio since both gears in the pair have the same tooth count.
