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When your CNC machine, robotic arm, or motorized drive system demands consistent torque transfer without slippage or premature wear, the gear you choose makes all the difference. Engineers, makers, and automation builders who need a reliable, off-the-shelf spur gear in a wide tooth-count range will find this 1 Mod series covers virtually every application — from compact 12-tooth pinions to large 150-tooth ring gears, all in a single standardized module.
Each gear is machined from 45# medium-carbon steel, a material known for its balanced hardness and machinability. The module is 1 (Mod 1), with a face width (thickness) of 10 mm (approximately 0.39 in). Tooth counts span 12T through 150T, with outer diameters ranging from approximately 14 mm (0.55 in) for the 12T up to approximately 152 mm (5.98 in) for the 150T. Bore diameter varies by tooth count — see variant options for exact bore dimensions. Sold as 1 piece per order.
Typical use cases include DC motor pinion drives in 3D printers and CNC routers, gear-reduction stages in robotic joints and servo actuators, and replacement gears for conveyor or indexing mechanisms requiring a standard Mod 1 pitch. Long-tail applications such as "1 mod steel spur gear for stepper motor" and "45 steel pinion gear 10mm face width" are well served by this range.
Wide Tooth-Count Range (12T–150T) — One product listing covers the full spectrum from compact motor pinions to large driven gears, eliminating the need to source from multiple suppliers.
45# Medium-Carbon Steel Construction — Offers a practical balance of tensile strength, wear resistance, and machinability. Suitable for moderate-to-high load drive applications.
Standardized Mod 1 Pitch — Fully interchangeable with any other Mod 1 component, including racks, worm gears, and mating spur gears, across metric gear systems worldwide.
10 mm Face Width (Thickness) — Consistent 10 mm tooth face across all tooth counts in this series ensures uniform load distribution and straightforward axial alignment.
Machined Tooth Profile — Gear teeth are cut to standard involute profile tolerances, providing smooth meshing, reduced noise, and predictable backlash in assembled gear trains.
Single-Piece Packaging — Each order ships as one individual gear, allowing you to order exactly the quantity and tooth count you need without overstocking.
| Module | 1 (Mod 1 / 1M) |
|---|---|
| Tooth Count (T) | 12T – 150T (see variant options) |
| Material | 45# Medium-Carbon Steel |
| Face Width (Thickness) | 10 mm (approx. 0.39 in) |
| Outer Diameter | See variant options |
| Bore Diameter | See variant options |
| Pressure Angle | 20° |
| Tooth Profile | Standard Involute |
| Finish | Natural steel (uncoated) |
| Quantity per Order | 1 piece |
The tooth count determines the gear ratio when paired with a mating gear. Divide the driven gear tooth count by the driving gear tooth count to get the reduction ratio. For example, a 12T pinion driving a 60T gear gives a 5:1 reduction. Select a smaller tooth count (12T–20T) for high-speed, low-torque pinion applications, and a larger count (60T–150T) for the driven side where you need torque multiplication.
Bore diameter varies by tooth count and is listed in the variant options on this page. Smaller gears (12T–20T) typically have bores in the 4–6 mm range, while larger gears (60T and above) may have bores of 10 mm or more. Always confirm the bore size matches your shaft diameter before ordering. If you need a custom bore, the steel material allows straightforward post-machining.
45# steel (equivalent to AISI 1045) has a typical tensile strength of approximately 600–800 MPa in its normalized state. It is well suited for moderate-load gear drives such as CNC axis drives, robotic joints, and light industrial conveyors. For very high-shock or heavy-duty applications, consider whether a heat-treated or alloy steel gear would be more appropriate for your load cycle.
45# steel is not inherently corrosion-resistant. The gears are supplied with a natural steel finish. For environments with moisture or mild chemical exposure, we recommend applying a light machine oil or grease after installation, or considering a post-purchase zinc or black-oxide coating. For fully corrosion-resistant requirements, a stainless steel gear would be a better choice.
Yes — all gears in this listing use the standard Mod 1 involute tooth profile with a 20° pressure angle, which is the most common metric gear standard. They will mesh correctly with any other Mod 1 component (racks, pinions, worm gears) regardless of brand, provided the face widths are compatible and the center distance is set correctly for the combined tooth counts.
Yes. Mod 1 steel spur gears are commonly used in 3D printer extruder drives, CNC axis gear reductions, and laser cutter feed mechanisms. The 10 mm face width provides adequate load capacity for most desktop and benchtop machine applications. Pair a small tooth count (12T–20T) on the motor shaft with a larger gear on the driven shaft to achieve your desired speed reduction.
Each order includes 1 piece of the selected tooth count. If you need multiple gears — for example, a matched pair for a gear train — simply increase the quantity in your cart or place separate orders for each tooth count you require.
