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When your motion system demands repeatable, low-backlash power transfer, mismatched or worn gears become the weakest link in the chain. Engineers, robotics builders, and CNC hobbyists who need a reliable, drop-in 1 Module spur gear across a wide tooth-count range will find this listing covers the full spectrum — from compact 12-tooth pinions to large 160-tooth drive wheels — all in a single, consistent gear series.
These 1Mod cylindrical spur gears are machined to Module 1 (1 Mod) standards, giving a circular tooth pitch of approximately 3.14 mm (0.124 in). Outer diameters span 14 mm (0.55 in) for the 12T pinion up to 162 mm (6.38 in) for the 160T gear. The tooth profile follows standard involute geometry for smooth meshing with any other Module 1 gear or rack.
Typical use cases include DC motor pinion drives in wheeled robots and AGVs, Z-axis and lead-screw reduction stages in desktop CNC routers, gear-train assemblies in 3D printer extruders and filament drives, and custom gearbox prototypes where a wide tooth-count selection eliminates the need for custom machining.
12T through 160T available in a single listing — choose the exact gear ratio you need without sourcing from multiple suppliers.
3.14 mm circular tooth pitch conforms to ISO/DIN Module 1 geometry, ensuring reliable mesh with any compatible 1 Mod counterpart.
Outer diameters from 14 mm to 162 mm are held to tight tolerances, supporting accurate center-distance calculations in your gearbox design.
Straight cylindrical spur teeth deliver consistent contact ratio and predictable backlash — critical for position-sensitive servo and stepper motor applications.
Compact small-tooth variants (12T–25T) are sized for direct mounting on common DC and stepper motor shafts used in robotics and automation platforms.
Pair any small pinion with a large driven gear from this same series to achieve reduction ratios from approximately 1:1 up to 1:13 within a single product family.
| Module | 1 Mod (ISO/DIN standard) |
|---|---|
| Tooth Profile | Standard involute, cylindrical spur |
| Circular Tooth Pitch | 3.14 mm (≈ 0.124 in) |
| Pressure Angle | 20° (standard) |
| Tooth Count Range | 12T – 160T (see variant options) |
| Outer Diameter Range | 14 mm – 162 mm (0.55 in – 6.38 in) |
| Face Width | See variant options |
| Bore Diameter | See variant options |
| Material | See variant options |
| Finish / Treatment | See variant options |
| Gear Accuracy Grade | See variant options |
| Compatible Module | Module 1 (1 Mod) only |
Determine your required gear ratio first: divide the driven gear tooth count by the driving pinion tooth count. For example, a 60T gear driven by a 12T pinion gives a 5:1 reduction. Then verify that the resulting center distance (sum of both pitch radii = (T1 + T2) / 2 mm for Module 1) fits your housing. All gears in this listing share the same Module 1 pitch, so any two tooth counts will mesh correctly.
Load capacity depends on material, face width, tooth count, and operating speed — all of which vary by variant. For light-duty robotics and hobbyist CNC applications running at moderate speeds, Module 1 gears in this size range typically handle torques from a few hundred gram-centimeters (small pinions) up to several Newton-meters (large gears). Contact us to confirm specifications for your specific variant before use in load-critical applications.
Corrosion resistance depends on the material and surface finish of the specific variant you select. Metal variants may benefit from additional protective coatings in humid or outdoor environments. Please check the variant details or contact us to confirm the finish treatment for your chosen tooth count before deploying in corrosive conditions.
Yes — all gears in this listing conform to standard Module 1 involute geometry with a 20° pressure angle, which is the most common Module 1 standard. They will mesh correctly with any other Module 1 spur gear, rack, or pinion that also uses a 20° pressure angle. Do not attempt to mesh with Module 0.8, Module 1.25, or other non-matching modules.
Bore diameter varies by tooth count and variant. Small pinions (12T–25T) are typically bored to fit common motor shaft diameters in the 3–8 mm range, while larger gears have proportionally larger bores. Select your variant and refer to the variant detail page, or contact us with your shaft diameter to confirm compatibility before ordering.
Yes. Module 1 spur gears are widely used in 3D printer extruder gear trains and filament drive systems. Small tooth-count variants (typically 12T–20T as the drive pinion paired with a 40T–60T driven gear) provide the torque multiplication needed for reliable filament grip. Verify bore diameter matches your motor shaft and that face width suits your extruder body width.
For two Module 1 spur gears, center distance (in mm) = (T1 + T2) ÷ 2, where T1 and T2 are the tooth counts of the two gears. For example, a 20T pinion meshing with a 60T gear requires a center distance of (20 + 60) ÷ 2 = 40 mm. This formula applies to all standard Module 1 involute gears with no profile shift.
