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When a mismatched or undersized gear causes skipped steps, excessive backlash, or premature wear in your motion-control build, the root cause is almost always a compromise on material or tooth geometry. Engineers, makers, and small-batch manufacturers who demand repeatable, low-noise power transmission need a module 1 spur gear they can spec with confidence — one that ships in the exact tooth count required without forcing a custom order.
These module 1 cylindrical spur gears are machined from 45# carbon steel, a medium-carbon structural steel known for its balanced hardness and machinability. Each gear follows the standard 1 mod (1M) tooth profile, with outside diameters ranging from 14 mm (0.55 in) for the 12-tooth variant up to 162 mm (6.38 in) for the 160-tooth variant. Tooth counts span 12 T through 160 T in single-tooth increments across the small-to-mid range, giving you fine resolution when matching gear ratios. Available in single-piece or 3-piece packs.
Typical use cases include CNC router and laser-cutter axis drives requiring a compact 1M pinion-and-gear pair, robotics joint actuators where a specific reduction ratio must be achieved within a tight envelope, and light industrial conveyor or indexing mechanisms where a standardized module simplifies replacement sourcing. The consistent 20° pressure angle and standard addendum make these gears interchangeable with any other module 1 component in your drivetrain.
Machined from medium-carbon 45# steel for a reliable balance of surface hardness, tensile strength, and machinability — suitable for moderate-load continuous-duty applications.
A single product line covers outside diameters from 14 mm to 162 mm, letting you dial in almost any gear ratio without sourcing from multiple suppliers.
Conforms to the ISO/DIN module 1 tooth profile standard, ensuring drop-in interchangeability with racks, pinions, and mating gears from any compliant source.
Straight-cut cylindrical teeth transmit torque along a parallel axis with no axial thrust load, simplifying bearing selection and reducing vibration in precision positioning systems.
Order one piece for prototyping or evaluation, or choose the 3-piece pack for production builds and spares inventory — both options ship in the same tooth-count variant.
Each gear is supplied with a through-bore sized to the standard for its tooth count; the bore can be further machined or keyed to match your shaft diameter as needed.
| Module | 1 (1M) |
|---|---|
| Tooth Count Range | 12 T – 160 T |
| Outside Diameter Range | 14 mm – 162 mm (0.55 in – 6.38 in) |
| Pressure Angle | 20° |
| Tooth Profile | Cylindrical spur (straight cut) |
| Material | 45# Carbon Steel |
| Surface Finish | See variant options |
| Bore Diameter | See variant options |
| Face Width | See variant options |
| Hardness | See variant options |
| Packing Quantity | 1 pcs / 3 pcs (selectable) |
Divide the desired gear ratio by 1 to get the tooth-count ratio between the driver and driven gear. For example, a 3:1 reduction using a 20-tooth pinion requires a 60-tooth gear. With this product covering 12 T through 160 T, most common ratios from roughly 1.2:1 up to 13:1 can be achieved in a single mesh stage.
45# carbon steel offers a tensile strength typically in the range of 600–800 MPa depending on heat treatment. These gears are suited for moderate continuous loads common in CNC, robotics, and light automation. For heavy shock loads or high-cycle fatigue environments, consider gears made from alloy steel or with surface hardening treatment.
45# carbon steel has limited inherent corrosion resistance. For indoor or dry environments this is generally acceptable. If your application involves moisture, coolant exposure, or outdoor use, we recommend applying a rust-inhibiting coating, grease, or considering stainless steel alternatives for your specific environment.
Yes — as long as your existing rack or mating gear is also Module 1 with a 20° pressure angle, these gears are fully interchangeable. Module 1 is a globally standardized tooth profile (ISO 54 / DIN 780), so compatibility across compliant components is guaranteed by the standard geometry.
For a module 1 spur gear, the outside diameter (OD) in mm equals the tooth count plus 2. For example, a 20-tooth gear has an OD of 22 mm, and a 50-tooth gear has an OD of 52 mm. This matches the variant labels shown in the size selector (e.g., "1M20T / 22mm").
Yes. The gears are supplied with a standard through-bore and can be further bored, reamed, or broached to accept a keyway or custom shaft size. This is standard practice in machine shops and is compatible with the 45# carbon steel material. Contact us to confirm the as-supplied bore diameter for your specific tooth count before machining.
Both options ship the identical gear in your chosen tooth count. The 1-piece option is ideal for prototyping, evaluation, or single-axis builds. The 3-piece pack offers a lower per-unit cost and is practical for multi-axis machines, production runs, or keeping a spare on hand. Select your preferred quantity in the Packing Quantity option above.
