Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When your CNC router, robotic arm, or automation drive system demands reliable torque transmission without backlash creep, undersized or poorly machined gears become the weakest link. These Module 5 spur gears are engineered for makers, machine builders, and industrial integrators who need consistent mesh accuracy across a wide tooth-count range — from compact 12-tooth pinions to larger 35-tooth drive gears.
Each gear is machined from 45# medium-carbon steel, offering a balance of machinability and surface hardness suitable for moderate-to-heavy load applications. The pitch circle diameter scales with tooth count: at Module 5, pitch = 15.7 mm (0.618 in) per tooth, giving a pitch diameter range of approximately 60 mm (2.36 in) for 12T up to 175 mm (6.89 in) for 35T. Face width (tooth thickness along the shaft axis) is a uniform 50 mm (1.97 in) across all variants, providing substantial load-bearing contact area.
Typical use cases include: DIY CNC gantry drives requiring module 5 spur gear sets for rack-and-pinion or gear-train reduction; robotic joint actuators where a pinion motor gear must mesh with a larger driven gear; and industrial conveyor or indexing systems needing a standardized modulus 5 steel gear with a 50 mm face width for high-torque, low-speed applications.
Machined from 45# steel for a reliable combination of tensile strength and machinability, supporting moderate-to-heavy radial and tangential loads in drive train applications.
Conforms to the international Module 5 gear standard with a circular pitch of 15.7 mm (0.618 in), ensuring direct interchangeability with any Mod 5 mating gear or rack on the market.
A consistent 50 mm (1.97 in) tooth face width across all tooth counts maximizes contact area and load distribution, reducing surface stress in high-torque applications.
Twenty-four tooth-count options from 12 to 35 teeth let you dial in the exact gear ratio needed for your CNC, robotics, or automation drive without custom machining.
Bore and hub dimensions are sized for direct mounting on standard motor output shafts, making these gears a drop-in pinion solution for servo, stepper, and DC motor drives.
Straight spur tooth geometry delivers efficient power transfer with no axial thrust load, simplifying bearing selection and shaft alignment in parallel-axis gear trains.
| Gear Type | Spur Gear (Straight Tooth) |
|---|---|
| Module (Modulus) | 5 |
| Circular Pitch | 15.7 mm (0.618 in) |
| Tooth Count Range | 12T – 35T (24 variants) |
| Face Width (Thickness) | 50 mm (1.97 in) |
| Pitch Diameter Range | 60 mm – 175 mm (2.36 in – 6.89 in) |
| Material | 45# Medium-Carbon Steel |
| Bore Diameter | See variant options |
| Hub Diameter | See variant options |
| Keyway | See variant options |
| Pressure Angle | 20° (standard) |
| Surface Finish | Machined, natural steel |
| Quantity per Order | 1 pc |
Select tooth count based on your required gear ratio. Divide the driven gear teeth by the driving (pinion) gear teeth to get the ratio. For example, pairing a 12T pinion with a 24T driven gear gives a 2:1 reduction. Smaller tooth counts (12T–16T) suit high-speed pinion applications; larger counts (25T–35T) are better as driven gears or for lower reduction ratios.
45# steel has a tensile strength of approximately 600–800 MPa depending on heat treatment. With a 50 mm face width and Module 5 tooth size, these gears are suited for moderate-to-heavy industrial loads. Exact torque ratings depend on operating speed, lubrication, and shaft/bore fit — consult a gear load calculator using the Lewis equation for your specific application parameters.
45# carbon steel is not inherently corrosion resistant. For outdoor or humid environments, apply a gear lubricant or grease regularly, or consider adding a protective coating (zinc plating, black oxide, or paint) after purchase. For corrosive environments, stainless steel or nylon gears may be more appropriate.
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 components are labeled "M5" or "Mod 5" and use a 20° pressure angle (the international standard). Metric module gears are not interchangeable with imperial diametral pitch (DP) gears.
Bore diameter varies by tooth count and hub size. Please check the variant detail page or contact us to confirm the bore diameter for your specific tooth count before ordering. We recommend measuring your motor or shaft output diameter and confirming compatibility prior to purchase.
Yes. Module 5 spur gears are a common choice for CNC rack-and-pinion gantry drives. Pair the appropriate tooth count pinion with a Module 5 steel or nylon rack. Smaller tooth counts (12T–16T) are typical for pinion-on-rack CNC drives, offering a good balance of resolution and speed. Ensure your motor shaft matches the bore diameter of the selected variant.
Keyway availability varies by variant — please contact us to confirm whether your selected tooth count includes a keyway. Custom bore machining is not offered through this listing; if you require a specific bore size or keyway dimension, consult a local machine shop for secondary machining after purchase.
