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When a mismatched or undersized gear causes slippage, noise, or premature wear in your drive train, the root cause is almost always a mismatch between module, tooth count, and shaft bore. Engineers, robotics builders, and machine designers who need a reliable 5 module cylindrical spur gear with a confirmed outer diameter will find this motor pinion series purpose-built for that challenge.
Each gear in this series is machined to a 5 Mod (Module 5) standard, with tooth counts ranging from 15T to 33T and corresponding outer diameters from 85 mm (3.35 in) to 175 mm (6.89 in). The body is typically manufactured from carbon steel or alloy steel with a precision-hobbed tooth profile, delivering consistent pitch accuracy across the full tooth range. Bore diameter and keyway dimensions vary by tooth count — see variant options for confirmed bore specs.
Typical use cases include low-speed, high-torque motor pinion assemblies in conveyor systems, CNC rotary axes, robotic joint actuators, and custom gearbox builds where a 5 mod spur gear with a large outer diameter is required. Long-tail applications such as "5 module gear for stepper motor" and "large diameter steel spur gear 170mm" are well served by the 32T and 33T variants in this range.
Available from 15T (85 mm OD) through 33T (175 mm OD), covering a broad gear ratio spread in a single product family — no need to source from multiple suppliers.
Machined to the international Module 5 standard, ensuring direct mesh compatibility with any Mod 5 rack or mating gear without custom modification.
Typically carbon steel or alloy steel body with hobbed tooth profile — engineered to handle the torque loads common in motor pinion and gearbox applications.
Each tooth count variant lists its exact OD (e.g., 20T = 110 mm, 30T = 160 mm), eliminating guesswork when designing for tight housing clearances.
Straight-cut cylindrical spur tooth geometry delivers efficient power transfer on parallel shafts with minimal axial thrust — ideal for compact drive assemblies.
Bore and hub dimensions sized for direct mounting on common motor output shafts. Confirm bore and keyway dimensions against your motor spec via the variant options.
| Module (Mod) | 5 |
|---|---|
| Tooth Count Range | 15T – 33T |
| Outer Diameter Range | 85 mm – 175 mm (3.35 in – 6.89 in) |
| Gear Type | Cylindrical Spur Gear |
| Tooth Profile | Involute, hobbed |
| Pressure Angle | 20° |
| Material | See variant options |
| Surface Finish | See variant options |
| Bore Diameter | See variant options |
| Keyway | See variant options |
| Hub Width | See variant options |
| Weight | See variant options |
| Application | Motor pinion, gearbox, conveyor, robotics, CNC rotary axis |
Select your tooth count based on the gear ratio you need and the available space in your housing. The outer diameter increases by approximately 5 mm per additional tooth at Module 5 (OD = (T + 2) × Module). For example, a 20T gear gives a 110 mm OD; a 30T gear gives a 160 mm OD. Match the mating gear tooth count to achieve your target reduction ratio.
Yes — any gear or rack manufactured to the Module 5 standard with a 20° pressure angle will mesh correctly with these gears. Verify that your existing component is labeled "Mod 5" or "m5" and uses a 20° pressure angle before ordering.
These gears are typically manufactured from carbon steel or alloy steel with a hobbed tooth profile. Exact material grade and surface treatment (e.g., blackened, zinc-plated) vary by variant. Please check the variant options or contact us to confirm the material specification for your selected tooth count.
Steel spur gears at Module 5 are rated for substantial torque loads in industrial and semi-industrial applications. Actual load capacity depends on material grade, RPM, lubrication, and mounting accuracy. For critical load calculations, contact us with your RPM, torque, and duty cycle requirements so we can confirm suitability.
Standard carbon steel gears have limited corrosion resistance without additional treatment. For outdoor or humid environments, we recommend applying a gear lubricant or grease, or selecting a variant with a protective surface finish. Contact us to confirm available finish options for your selected tooth count.
Bore diameter and keyway dimensions vary by tooth count and are listed in the variant options. Please select your tooth count above to view the confirmed bore spec, or contact us with your shaft diameter and we will confirm compatibility before you order.
Yes — these gears are designed for motor pinion use. Confirm that your motor output shaft diameter matches the bore of your selected variant, and that the keyway (if present) aligns with your motor shaft key. For direct mounting without a keyway, a set-screw hub or interference fit may be required.
