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When your CNC router, 3D printer, or robotics build demands precise, repeatable torque transfer, a mismatched or worn spur gear becomes the weakest link in the entire drivetrain. Engineers, makers, and small-batch manufacturers who need reliable metric gearing without sourcing delays will find this 1 Module pinion spur gear series a dependable drop-in solution across a wide range of shaft sizes and material requirements.
Each gear is machined to a 1 Module (1M) standard with tooth counts from 20T to 24T, covering pitch diameters of approximately 20 mm (0.79 in) to 24 mm (0.94 in). Bore options span 4 mm to 14 mm (0.16–0.55 in), with specialty configurations including standard round bore, D-hole, No Step, keyway (3×1.4 mm or 4×1.8 mm), and combined keyway variants. Face width is typically 10–15 mm depending on material and tooth count. Available in Blue Nylon (PA66), 45 Carbon Steel (black oxide), and 304 Stainless Steel.
Typical use cases include stepper motor pinion drives for desktop CNC machines, servo output shafts in robotic arms, rack-and-pinion linear actuators, and light-duty conveyor indexing systems. Long-tail applications include 1M 20T nylon gear for 3D printer extruder, 1M 22T stainless spur gear for food-grade automation, and 1M 24T steel pinion for RC car drivetrain upgrade.
Choose Blue Nylon (PA66) for quiet, low-friction operation; 45 Carbon Steel for high-torque mechanical drives; or 304 Stainless Steel for corrosion-resistant environments — all in the same 1M tooth profile.
Bore sizes from 4 mm to 14 mm (0.16–0.55 in) accommodate common stepper motor shafts, servo shafts, and custom axles. D-hole and keyway variants prevent shaft slippage under load.
Five tooth-count options (20, 21, 22, 23, 24 teeth) let you fine-tune gear ratios for speed or torque without changing the module standard, keeping your drivetrain interchangeable.
Keyway configurations (3×1.4 mm and 4×1.8 mm) and D-hole bores provide positive shaft engagement, eliminating rotational slip in high-cycle or high-torque applications.
Order 1 piece for prototyping or replacement, or select the 10-piece pack for production runs and spare-parts inventory — both options available across most gear/material combinations.
All gears are cut to 1 Module (1M) metric standard with a 20° pressure angle, ensuring smooth meshing with any compatible 1M rack or mating gear regardless of tooth count.
| Module | 1M (1 Module) |
|---|---|
| Pressure Angle | 20° |
| Tooth Count Options | 20T, 21T, 22T, 23T, 24T |
| Pitch Diameter Range | 20–24 mm (0.79–0.94 in) |
| Bore Diameter Range | 4–14 mm (0.16–0.55 in) |
| Bore Types | Round, D-hole, No Step, Keyway (3×1.4 mm, 4×1.8 mm) |
| Face Width | See variant options |
| Material Options | Blue Nylon (PA66), 45 Carbon Steel, 304 Stainless Steel |
| Surface Finish | Natural (Nylon), Black Oxide (45 Steel), Brushed (Stainless) |
| Weight | See variant options |
| Pack Quantity | 1 piece or 10 pieces (select above) |
Tooth count determines your gear ratio when paired with a mating gear or rack. A lower tooth count (e.g., 20T) on the drive pinion produces more torque but lower speed; a higher count (e.g., 24T) increases speed at the cost of torque. For most CNC and 3D printer applications, 20T is the most common pinion choice. All five options share the same 1M module and 20° pressure angle, so they mesh interchangeably with any 1M mating gear.
A Round bore is a plain cylindrical hole — easiest to install but relies on a set screw or press fit to prevent rotation. A D-hole has one flat side matching a D-shaft, providing positive anti-rotation without a keyway. No Step means the bore is a straight round hole with no shoulder step, suitable for flush-mount or through-shaft installations. Keyway variants (3×1.4 mm or 4×1.8 mm) accept a standard key for maximum torque transmission in high-load drives.
Blue Nylon (PA66) is lightweight, self-lubricating, and runs quietly — ideal for 3D printers, light robotics, and applications where noise reduction matters. 45 Carbon Steel offers significantly higher strength and wear resistance for mechanical drives, CNC machines, and power transmission where loads are moderate to high. 304 Stainless Steel adds corrosion resistance for wet, humid, or food-adjacent environments while maintaining good strength. Choose stainless when the gear will be exposed to moisture or cleaning agents.
Measure your motor shaft diameter with a caliper. Then select the matching bore size from the variant options (e.g., 5 mm, 6 mm, 8 mm, etc.). For D-shaft motors, choose the D-hole variant and verify the flat dimension matches your shaft. For keyway shafts, select the keyway variant and confirm the key dimensions (3×1.4 mm or 4×1.8 mm) match your shaft's keyway slot. If your shaft is between standard sizes, contact us to confirm before ordering.
For light-duty CNC routers, 3D printers, and small robotic joints, Blue Nylon gears are typically sufficient and offer the advantage of quiet operation. For medium-to-heavy CNC drives, servo-driven axes, or rack-and-pinion linear systems, 45 Carbon Steel is recommended. Stainless Steel sits between the two in terms of strength but excels in corrosion resistance. If your application involves shock loads or continuous high-torque cycling, 45 Steel or Stainless Steel with a keyway bore is the most reliable choice.
Yes. All gears in this listing are machined to the 1 Module (1M) metric standard with a 20° pressure angle, which is the international standard for this module size. They will mesh correctly with any 1M rack, 1M pinion, or 1M spur gear regardless of tooth count, as long as the module and pressure angle match. Mixing modules (e.g., pairing a 1M gear with a 1.5M rack) will result in incorrect meshing and must be avoided.
Yes. Most gear/material/bore combinations are available in both single-piece (1 pc) and 10-piece pack options. Select your preferred quantity in the "Bore & Amount (Pcs)" variant dropdown. The 10-pack pricing reflects a per-unit discount compared to buying individually, making it cost-effective for production runs, classroom kits, or maintaining a spare-parts stock.
