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When your CNC router, robotic arm, or automation rig demands reliable torque transfer at an angle, a poorly matched gear becomes the weakest link in the entire drivetrain. Engineers and makers who need consistent, low-backlash bevel gear performance across a wide tooth-count range will find this 1.5 module steel helical bevel gear series purpose-built for the task.
Each gear is machined from carbon steel and features a 1.5M (module 1.5) tooth profile with an umbrella-tooth bevel geometry. The available tooth counts span 15T through 40T, with corresponding pitch circle diameters ranging from approximately 24.3 mm (~0.96 in) for the 15T up to 61.8 mm (~2.43 in) for the 40T. Bore diameter and keyway dimensions vary by tooth count — see variant options for exact bore specs.
Typical use cases include 90° shaft-angle drives in desktop CNC machines, stepper-motor gearboxes for 3D printer Z-axis assemblies, and right-angle power transmission in small conveyor or pick-and-place automation systems. The helical tooth form reduces noise and distributes load more evenly than straight-cut bevel gears, making it a reliable choice for continuous-duty motor gear applications.
Standardized 1.5M pitch ensures interchangeability with other module-1.5 bevel gears across common automation and CNC platforms.
Angled tooth engagement reduces impact noise and spreads contact stress over a larger surface area compared to straight-cut bevel gears, extending service life under cyclic loads.
Machined from carbon steel for a balance of machinability, tensile strength, and wear resistance suitable for motor-driven gear trains in light-to-medium duty applications.
Eighteen size options (15T, 16T … 30T, 35T, 40T) let you dial in the exact gear ratio and pitch circle diameter your drivetrain requires without custom machining.
Bevel geometry transfers rotation between intersecting shafts at a 90° angle, ideal for changing drive direction in compact machine enclosures where space is limited.
Order a single gear for prototyping or a multi-pack for production builds and spare-parts inventory — all at consistent per-unit quality.
| Module | 1.5M |
|---|---|
| Tooth Profile | Helical bevel (umbrella tooth) |
| Material | Carbon steel |
| Tooth Count Range | 15T – 40T (18 sizes) |
| Pitch Circle Diameter Range | 24.3 mm – 61.8 mm (0.96 in – 2.43 in) |
| Shaft Angle | 90° |
| Bore Diameter | See variant options |
| Keyway | See variant options |
| Surface Finish | See variant options |
| Pressure Angle | Typically 20° |
| Pack Quantity | 1 pcs / 4 pcs / 8 pcs |
| Weight (per piece) | See variant options |
Select the tooth count based on your required gear ratio and available shaft spacing. For a 1:1 ratio, pair two gears of the same tooth count. For speed reduction, use a smaller driver gear and a larger driven gear — for example, a 15T driving a 30T gives a 2:1 reduction. Always verify that the pitch circle diameters of the mating pair fit within your housing clearance.
Bore diameter varies by tooth count and is listed in the variant detail page. Please check the bore spec for your chosen size against your motor or shaft diameter before ordering. If you need a custom bore, the carbon steel construction allows straightforward machining by a local shop.
Yes, for light-to-medium duty continuous operation. Carbon steel provides adequate tensile and shear strength for stepper and servo motor applications typical in CNC routers, 3D printers, and small automation rigs. For heavy industrial loads or high-speed applications above approximately 1,500 RPM, consider whether a hardened or alloy steel variant better suits your torque requirements.
Carbon steel has moderate corrosion resistance. For indoor, dry environments these gears perform well with periodic light lubrication (grease or gear oil). For humid or outdoor environments, apply a corrosion-inhibiting grease and consider a protective coating. If corrosion resistance is a primary concern, look for stainless steel or brass bevel gear alternatives.
Yes. Because all gears in this series share the same 1.5 module, any two sizes will mesh correctly at a 90° shaft angle. The gear ratio equals the driven tooth count divided by the driver tooth count. For example, pairing a 20T driver with a 40T driven gear yields a 2:1 speed reduction (and 2× torque multiplication, ignoring losses).
Helical (umbrella) tooth geometry means multiple teeth are in contact simultaneously, which distributes load more evenly, reduces peak stress per tooth, and lowers operating noise. This makes helical bevel gears a better fit for motor-driven applications where smooth, quiet operation and longer tooth life matter — such as CNC axis drives and robotic joints.
A lithium-based or molybdenum-disulfide (MoS₂) grease applied to the tooth faces is suitable for most low-to-medium speed applications. For higher-speed or higher-load setups, an ISO VG 220 gear oil splash-lubrication system is recommended. Re-lubricate at regular maintenance intervals based on your duty cycle.
