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When your motion-control build demands a gear that won't slip, strip, or flex under load, sourcing a reliable 2 mod spur gear becomes the critical bottleneck. Hobbyists building CNC routers, robotics engineers prototyping actuator stages, and small-batch manufacturers assembling conveyor drives all share the same frustration: finding a metric-pitch spur gear machined to consistent tolerances without ordering a full factory run. This 2 Mod Spur Gear in 45# carbon steel is stocked in a wide tooth-count range specifically for that audience.
Each gear is machined from 45# medium-carbon steel, delivering a tensile strength typically in the 600–800 MPa range before any surface treatment. The module is 2 (metric), tooth counts span 10T through 40T, face width (thickness) is a fixed 20mm (0.79 in), and outside diameters run from 24mm (0.94 in) for the 10T up to 84mm (3.31 in) for the 40T — following the standard formula OD = (T + 2) × module. Bore diameter and keyway dimensions vary by tooth count; see variant options for exact bore specs.
Typical use cases include open-loop stepper-driven XY gantries where a 2 mod gear pair keeps backlash predictable, rack-and-pinion linear actuators on 3D-printer Z-axes, and small industrial conveyor drives requiring a compact, replaceable gear stage. Long-tail search terms this product addresses: "metric module 2 spur gear steel", "45 steel gear 20mm face width", and "replacement spur gear for CNC router".
Machined from 45# medium-carbon steel for a balance of machinability and load-bearing strength, suitable for moderate-to-high torque drive applications.
Wide Tooth-Count Selection (10T–40T)Thirty-one tooth-count options in a single product listing let you dial in your gear ratio without sourcing from multiple suppliers.
Fixed 20mm Face WidthA consistent 20mm (0.79 in) tooth face width across all variants simplifies gear-pair alignment and load distribution calculations.
Standard Module 2 / 20° Pressure AngleFully interchangeable with any Mod 2 rack or mating gear following ISO 54 / DIN 780 standards — no custom tooling required.
Corrosion-Resistant Surface FinishGears are finished to resist oxidation during storage and light-duty operation; apply grease or anti-rust coating for extended outdoor or humid-environment use.
Flexible Pack Quantities (1, 2, or 3 Pcs)Order a single gear for a prototype or a pack of three for a production run — all at a per-unit price that scales with quantity.
| Module | 2 (Metric) |
|---|---|
| Pressure Angle | 20° |
| Material | 45# Carbon Steel |
| Tooth Count Range | 10T – 40T |
| Face Width (Thickness) | 20mm (0.79 in) |
| Outside Diameter Range | 24mm – 84mm (0.94 in – 3.31 in) |
| Bore Diameter | See variant options |
| Keyway | See variant options |
| Surface Finish | See variant options |
| Pack Quantity | 1 Pcs / 2 Pcs / 3 Pcs |
| Standard | ISO 54 / DIN 780 (Mod 2) |
Select your tooth count based on the gear ratio you need. Divide the tooth count of the driven gear by the tooth count of the driving gear to get the ratio. For example, pairing a 10T driver with a 20T driven gear gives a 2:1 reduction. Also confirm that the resulting outside diameter fits within your housing clearance — OD = (T + 2) × 2mm for this module.
45# carbon steel has a typical tensile strength of 600–800 MPa. Actual load capacity depends on tooth count, face width, operating speed, lubrication, and application shock factor. For precise torque ratings, apply AGMA or ISO 6336 gear-strength calculations using the gear geometry and your operating conditions. These gears are suited for moderate-to-high torque hobby and light industrial drives.
45# carbon steel has moderate corrosion resistance. For outdoor, humid, or washdown environments, apply a grease coating, anti-rust spray, or consider a zinc-plated or stainless alternative. For indoor, enclosed, or well-lubricated drives, the as-machined finish is typically adequate for long service life.
Yes — any gear or rack with Module 2 and a 20° pressure angle will mesh correctly with these gears. This is the most common metric gear standard and is interchangeable across ISO 54 and DIN 780 compliant components. Verify that the face widths are compatible and that center distance matches your design.
Bore diameter varies by tooth count and is listed in the variant detail page. Please check the variant options or contact us to confirm the bore size before ordering, especially if you need a specific shaft fit (H7 tolerance or keyed bore).
Yes. Module 2 spur gears are widely used in CNC router rack-and-pinion drives, 3D printer Z-axis lead stages, and stepper-motor gearboxes. The 20mm face width provides adequate tooth engagement for typical hobby-CNC torque levels. Pair with a matching Mod 2 rack or mating gear and apply light machine grease for best results.
For two Module 2 spur gears, center distance = (T1 + T2) × module / 2. For example, a 10T and a 20T gear: center distance = (10 + 20) × 2 / 2 = 30mm. This is the theoretical center distance; add a small backlash allowance (typically 0.05–0.15mm for Mod 2) for smooth meshing without binding.
