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When your drivetrain demands a reliable 90° direction change without sacrificing torque or rotational accuracy, a mismatched or worn bevel gear becomes the weakest link in the entire system. Engineers, robotics builders, and DIY machinery enthusiasts who need a 4 Module 20-tooth bevel gear with a 1:1 ratio will find this component engineered to deliver consistent mesh engagement and minimal backlash across demanding duty cycles.
Each gear is machined from carbon steel with a natural metallic finish, offering a balance of hardness and machinability. The 4 Module (Mod 4) tooth profile follows standard metric gear geometry, with an outer diameter typically in the range of 88–92mm (approx. 3.46–3.62 in) depending on bore selection. Bore diameters span 20mm to 40mm (0.79 in to 1.57 in), covering the most common shaft sizes used in metric mechanical assemblies.
Typical use cases include right-angle gearbox assemblies for CNC router axis drives, custom conveyor direction-change modules, and compact robotic joint actuators where a 1:1 bevel gear pair is required for synchronized shaft rotation at 90°. The standardized Mod 4 tooth pitch also makes these gears straightforward to pair with matching bevel pinions sourced from any metric gear supplier.
| Module (Mod) | 4 |
|---|---|
| Number of Teeth | 20T |
| Gear Ratio | 1:1 |
| Pressure Angle | 20° |
| Shaft Angle | 90° |
| Bore Diameter | 20 / 22 / 24 / 25 / 28 / 30 / 32 / 35 / 40 mm — See variant options |
| Outer Diameter (approx.) | Typically 88–92mm (3.46–3.62 in) |
| Material | Carbon Steel |
| Finish | Natural metallic (uncoated) |
| Keyway | See variant options |
| Weight (per piece) | See variant options |
| Quantity | 1 pc per order (single gear only) |
Measure your shaft diameter with a caliper and select the matching bore size from the variant dropdown. Available bores are 20, 22, 24, 25, 28, 30, 32, 35, and 40mm. If your shaft requires a keyway or set-screw hole, that machining is typically done after purchase by a local machine shop.
Yes — as long as your existing pinion is also Mod 4 with 20 teeth and a 20° pressure angle, these gears will mesh correctly. Confirm the module and tooth count on your current gear before ordering. Mixing different modules (e.g., Mod 3 with Mod 4) will result in incorrect mesh and accelerated wear.
Load capacity depends on operating speed, lubrication, and mounting rigidity. Carbon steel Mod 4 bevel gears of this tooth count are suited for light-to-medium duty applications such as robotics joints, small conveyor drives, and CNC auxiliary axes. For heavy industrial loads exceeding continuous high-torque operation, consult an engineer for a formal gear strength calculation.
The gear is machined from carbon steel with a natural (uncoated) finish, which offers moderate corrosion resistance in dry indoor environments. For humid, wet, or outdoor applications, apply a light machine oil or grease to the tooth flanks and bore, or consider sourcing a stainless steel variant if your environment demands it.
Yes. Each order contains one gear. For a complete 1:1 bevel gear pair, you need to purchase two gears — one for each shaft. Since the ratio is 1:1 and both gears have 20 teeth, both gears in the pair are identical, so you can simply order two of the same variant.
A medium-viscosity gear grease (NLGI Grade 1 or 2) applied to the tooth contact faces is recommended for most applications. For high-speed, low-load scenarios, a light machine oil may be sufficient. Re-lubricate periodically based on your duty cycle and operating environment.
Yes. Mod 4 bevel gears are commonly used in CNC router axis direction-change assemblies and custom 3D printer extruder gearboxes. Ensure your motor shaft matches one of the available bore sizes, and that your gearbox housing provides adequate support for both shafts to maintain correct center distance and mesh alignment.
