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When a slipping or undersized gear stalls your CNC router, 3D printer drive train, or robotic arm mid-cycle, the cost is more than downtime — it's lost precision and rework. Engineers, makers, and small-batch manufacturers who need a dependable, drop-in transmission gear turn to Mod 2 spur gears machined from 45# carbon steel for consistent torque transfer and long service life.
Each gear in this series features a Module 2 tooth profile, a uniform face width of 20 mm (approximately 0.79 in), and a bore sized to the selected tooth count. The 45# medium-carbon steel body is heat-treatable and offers a good balance of hardness and machinability. Tooth counts span 10T through 100T, covering pitch diameters from roughly 20 mm (0.79 in) up to 200 mm (7.87 in), so you can match the exact gear ratio your drive system requires.
Typical applications include CNC rack-and-pinion axis drives, stepper-motor pinion stages for laser cutters and plasma tables, rotary indexing fixtures, conveyor drive trains, and DIY gearbox reduction stages — anywhere a standard Mod 2 spur gear mesh is specified.
45# Carbon Steel Construction — Medium-carbon steel body delivers the toughness needed for continuous-duty transmission loads without excessive brittleness.
Module 2 Tooth Profile — Standardized Mod 2 geometry ensures accurate mesh with any compatible Mod 2 rack or mating gear, minimizing backlash and noise.
20 mm Uniform Face Width — A consistent 20 mm (0.79 in) tooth face across the entire range provides stable load distribution and simplifies multi-gear stage alignment.
Wide Tooth-Count Range (10T – 100T) — Seventy-five size options let you dial in the exact gear ratio for your drive without custom machining.
Balanced Hardness & Machinability — 45# steel can be further heat-treated or surface-hardened if your application demands higher wear resistance, giving you flexibility for future upgrades.
Broad Application Fit — Suited for CNC axis drives, robotic arm joints, conveyor pinions, indexing tables, and DIY gearbox stages that call for a standard Mod 2 spur gear.
| Module | 2 (Mod 2) |
|---|---|
| Material | 45# Carbon Steel |
| Face Width (Thickness) | 20 mm (0.79 in) |
| Tooth Count Range | 10T – 100T |
| Pressure Angle | 20° |
| Pitch Diameter | Module × Teeth (e.g., 2 × 20T = 40 mm) |
| Bore Diameter | See variant options |
| Keyway | See variant options |
| Surface Finish | Machined, natural steel |
| Quantity per Order | 1 Pcs |
Determine your required gear ratio first: divide the driver tooth count by the driven tooth count. For example, a 20T pinion driving a 60T gear gives a 3:1 reduction. Select the tooth counts that achieve your target ratio while keeping the center distance within your frame constraints. The pitch diameter equals Module × Teeth, so a 2M 30T gear has a 60 mm pitch diameter.
Bore diameter varies by tooth count and is listed in the variant details. Please check the variant options or contact us to confirm the bore size before ordering, especially if you need a specific shaft fit.
45# carbon steel is not inherently corrosion-resistant. For outdoor or humid environments, we recommend applying a rust-inhibiting grease or coating, or considering a stainless-steel alternative. Regular lubrication will significantly extend service life in moist conditions.
45# carbon steel has a tensile strength of approximately 600–800 MPa in the normalized state and can be heat-treated to higher hardness for demanding applications. For precise load ratings, calculate the allowable bending stress using standard gear design formulas (AGMA or ISO 6336) with the actual face width and tooth count you select.
Yes. Any gear or rack with a Module 2 tooth profile and a 20° pressure angle will mesh correctly with these spur gears. Confirm that the mating component also uses Mod 2 geometry — mixing modules (e.g., Mod 1.5 with Mod 2) will cause interference and damage.
Some variants include a pre-machined keyway; others have a plain bore. Check the variant description for your selected tooth count. If you need a custom keyway or set-screw tapped hole, a local machine shop can add these features to the finished bore.
For most indoor CNC and automation applications, a medium-viscosity gear grease (NLGI Grade 1 or 2) applied to the tooth flanks is sufficient. For high-speed or high-load stages, an ISO VG 220 gear oil splash or drip system is preferred. Re-lubricate at regular maintenance intervals based on your duty cycle.
