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When a slipping or mismatched gear brings your CNC router, 3D printer, or robotics project to a halt, you need a replacement you can trust to mesh cleanly and hold up under load. These 1 Mod (Module 1) cylindrical spur gears are machined from 45# medium-carbon steel and are sized for makers, engineers, and small-batch manufacturers who demand dimensional accuracy without overpaying for off-the-shelf parts.
Each gear is a flat cylindrical spur design with a module of 1M, available in tooth counts from 8T to 180T and process hole diameters of 2.3 mm (≈0.09 in), 6 mm (≈0.24 in), 8 mm (≈0.31 in), 10 mm (≈0.39 in), and 12 mm (≈0.47 in). Outer diameters scale with tooth count — an 8T gear measures approximately 10 mm (≈0.39 in) OD, while a 180T gear reaches approximately 182 mm (≈7.17 in) OD. Pack quantities of 1, 2, 3, or 5 pieces let you stock exactly what your build requires.
Typical use cases include CNC router axis drives and rack-and-pinion linear motion systems, stepper-motor gearboxes in desktop automation and pick-and-place machines, and educational robotics platforms where repeatable gear ratios are critical. The standardized 1M tooth profile ensures interchangeability with any other Module 1 rack, pinion, or mating gear in your drivetrain.
Machined from 45# steel for a balance of hardness and machinability, delivering reliable torque transmission in continuous-duty motion-control applications.
Full compliance with the Module 1 gear standard ensures direct interchangeability with any 1M rack, pinion, or mating spur gear — no custom adaptation needed.
Choose from over 50 tooth-count options to dial in your exact gear ratio, whether you need a compact 8-tooth pinion or a large 180-tooth driven gear.
Available with bore diameters of 2.3 mm, 6 mm, 8 mm, 10 mm, and 12 mm to fit common stepper motor shafts, servo shafts, and standard metric rod stock.
Order a single replacement gear or stock a multi-piece set for prototyping and production runs — pack pricing scales proportionally for cost efficiency.
The straight-tooth spur geometry produces no axial thrust load, simplifying bearing selection and making these gears ideal for parallel-shaft drive configurations.
| Module | 1M (Module 1) |
|---|---|
| Tooth Count | 8T – 180T (see variant options) |
| Process Hole Diameter | 2.3 mm / 6 mm / 8 mm / 10 mm / 12 mm (see variant options) |
| Material | 45# Medium-Carbon Steel |
| Gear Type | Cylindrical Flat Spur Gear |
| Pressure Angle | 20° (standard for Module 1) |
| Outer Diameter (OD) | (Tooth Count + 2) × 1 mm — e.g., 8T ≈ 10 mm; 20T ≈ 22 mm; 60T ≈ 62 mm |
| Pitch Diameter | Tooth Count × 1 mm (Module × Teeth) |
| Gear Width (Face Width) | See variant options |
| Surface Finish | See variant options |
| Pack Quantity | 1 / 2 / 3 / 5 pcs (see variant options) |
| Weight (per piece) | See variant options |
Determine your required gear ratio first: divide the driven gear tooth count by the driving (pinion) gear tooth count. For example, a 20T pinion meshing with a 60T gear gives a 3:1 reduction. Smaller tooth counts (8T–20T) are typically used as pinions on motor shafts; larger counts (40T–180T) serve as driven gears or large-diameter output stages.
Match the process hole to your shaft diameter. Common stepper motor shafts are 5 mm or 6.35 mm — the 6 mm bore is the closest standard fit for most NEMA 17/23 steppers (you may need to ream to exact size). Servo and DC motor shafts of 8 mm, 10 mm, or 12 mm are covered by the corresponding bore options. The 2.3 mm bore suits small hobby motors and encoder shafts.
Yes. All gears in this listing follow the Module 1 (1M) standard with a 20° pressure angle, which is the global standard for metric spur gears. They will mesh correctly with any other Module 1 rack, pinion, or spur gear regardless of brand, as long as the tooth profile and module match.
45# steel (equivalent to SAE 1045) has a tensile strength of approximately 600–700 MPa in the normalized condition, making it suitable for moderate-to-high torque applications in CNC, robotics, and light industrial machinery. For very high-shock or high-speed applications, consider whether heat treatment or a higher-alloy steel would be more appropriate for your specific load case.
45# steel is a carbon steel and will oxidize if exposed to moisture without protection. For indoor CNC and robotics use in controlled environments, the bare steel finish is generally adequate. If your application involves humidity, coolant mist, or outdoor exposure, apply a light machine oil coating or consider a zinc-plated or stainless alternative for long-term corrosion resistance.
Yes. Module 1 spur gears are commonly used in 3D printer extruder gearboxes, Z-axis lead-screw drives, and laser cutter gantry systems. Select the tooth count that matches your existing gear ratio and a bore size that fits your motor shaft. The flat spur design produces no axial load, which is ideal for the light-duty bearings typically found in desktop machines.
For Module 1 gears, the outer diameter (OD) formula is: OD = (Tooth Count + 2) × Module = (T + 2) × 1 mm. Examples: 8T → 10 mm OD; 20T → 22 mm OD; 40T → 42 mm OD; 60T → 62 mm OD; 100T → 102 mm OD; 180T → 182 mm OD. Use this formula to verify clearance in your housing or chassis before ordering.
