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When a worn or undersized gear causes slippage, noise, or premature failure in your drive train, the root cause is almost always a mismatch between gear module, tooth count, and material strength. Engineers, CNC builders, robotics developers, and industrial maintenance teams need a spur gear that holds tolerance under load — and that is exactly what this 45# steel pinion gear is designed to deliver.
Each gear is machined from 45# carbon steel (medium-carbon structural steel), offering a balance of machinability and mechanical strength suited to moderate-to-heavy duty power transmission. Available in module sizes from 1M through 5M and tooth counts from 10T to 150T, gear outer diameters range from approximately 12 mm (0.47 in) for a 1M/10T up to approximately 760 mm (29.9 in) for a 5M/150T. Face width (thickness) is selectable from 10 mm to 40 mm (0.39–1.57 in) depending on variant.
Typical use cases include CNC router axis drives requiring a mod 1 or 2 spur gear for rack-and-pinion setups, robotic arm joint actuators needing a compact mod 1.5 pinion gear with low tooth count, and industrial conveyor or reduction gearbox assemblies where a mod 3–5 spur gear with 30T–80T provides the required gear ratio. Long-tail applications also include 3D printer extruder drives, laser cutter gantry systems, and DIY lathe or milling machine feed mechanisms.
Machined from 45# medium-carbon steel for reliable tensile strength and wear resistance in continuous-duty power transmission applications.
Seven module options (1M, 1.5M, 2M, 2.5M, 3M, 4M, 5M) cover light-duty precision drives through heavy industrial gearbox applications in a single product line.
Choose from 10 to 150 teeth to achieve your target gear ratio without custom machining. Larger tooth counts available in 1M and 1.5M modules for high-ratio reductions.
Gear thickness from 10 mm (0.39 in) to 40 mm (1.57 in) allows load capacity tuning to match torque requirements without changing the gear ratio.
Manufactured to the standard 20° involute pressure angle, ensuring direct interchangeability with off-the-shelf racks, pinions, and gearbox components from major suppliers.
Suitable for CNC machines, robotics, conveyor drives, reduction gearboxes, 3D printers, laser cutters, and DIY machine tool feed systems across Mod 1–5 configurations.
| Material | 45# Carbon Steel |
|---|---|
| Gear Type | Spur Gear (Involute) |
| Pressure Angle | 20° |
| Module (Mod) | 1M / 1.5M / 2M / 2.5M / 3M / 4M / 5M |
| Number of Teeth | 10T – 150T (see variant options) |
| Face Width (Thickness) | 10 – 40 mm (0.39 – 1.57 in) — see variant options |
| Outer Diameter | See variant options (calculated as (Z+2) × Mod) |
| Bore Diameter | See variant options |
| Surface Treatment | See variant options |
| Tooth Profile | Involute, standard full-depth |
| Handedness | N/A (spur gear — no helix) |
| Application | CNC drives, robotics, conveyor systems, gearboxes, machine tools |
The module must match the mating gear or rack exactly. Measure the pitch diameter of your existing gear and divide by the number of teeth — that gives you the module. Alternatively, measure the tooth pitch (distance between adjacent teeth) and divide by π (≈3.1416). Common module values for light CNC and robotics work are 1M and 1.5M; industrial drives typically use 2M–5M. If you are unsure, contact us to confirm before ordering.
Module (Mod) defines the size of each tooth relative to the pitch diameter. A 2M gear has teeth twice as large as a 1M gear with the same tooth count, resulting in a larger outer diameter and higher load capacity. For the same gear ratio, a 2M gear will be physically larger and stronger than a 1M gear. Choose a higher module when transmitting more torque or when operating at lower speeds with higher loads.
45# carbon steel (equivalent to AISI 1045) has a typical tensile strength of approximately 600–800 MPa and yield strength of around 355–490 MPa in the normalized condition. It is well-suited for moderate-to-heavy duty spur gear applications where surface hardening is not required. For very high-cycle or high-impact applications, consider whether additional heat treatment or a higher-alloy steel would be appropriate for your specific load case.
45# carbon steel has limited inherent corrosion resistance. For indoor, dry, or lightly lubricated environments, the material performs well with standard gear oil or grease lubrication. For humid, wet, or chemically exposed environments, consider applying a rust-inhibiting coating or lubricant, or contact us to confirm whether a surface-treated variant is available for your selected size.
Yes — provided the module, pressure angle (20°), and tooth profile (standard involute full-depth) match your existing components. Spur gears of the same module are interchangeable regardless of brand. Verify the bore diameter and keyway dimensions separately, as those are application-specific and not standardized across all suppliers.
For a standard spur gear, the outer (tip) diameter is calculated as: OD = (Z + 2) × Mod, where Z is the number of teeth and Mod is the module value in millimeters. For example, a 2M gear with 20 teeth has an OD of (20 + 2) × 2 = 44 mm. Use this formula to verify the gear will fit within your housing or clearance envelope before ordering.
Face width affects the load-carrying capacity of the gear — a wider face distributes tooth load over a larger contact area, reducing contact stress. As a general guideline, face width is typically 8–16 times the module for spur gears. For a 2M gear, that suggests 16–32 mm. If you are transmitting high torque or running at elevated speeds, select a wider face. For light-duty or space-constrained applications, a narrower face (10–15 mm) is often sufficient.
