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When a slipping or undersized gear causes positioning errors in your CNC router, robotic arm, or conveyor drive, the root cause is almost always a mismatch between module, tooth count, and bore tolerance. Engineers and makers who need a reliable Module 1.5 spur gear with hub turn to this C45 steel pinion series to eliminate that frustration and keep their builds running true.
Each gear is machined from C45 medium-carbon steel and heat-treated for surface hardness, giving a tough, wear-resistant tooth profile. The hub design provides a secure shaft interface across bore sizes ranging from 6 mm (0.24 in) to 25 mm (0.98 in), with plain-bore and keyway variants (4 mm, 5 mm, 6 mm, and 8 mm keyways) available depending on tooth count. Tooth counts span 12 T through 60 T at Module 1.5, covering pitch diameters from 18 mm (0.71 in) to 90 mm (3.54 in).
Typical use cases include stepper and servo motor pinion drives in desktop CNC machines, gear-reduction stages in 3D-printer extruder assemblies, and rotary indexing tables in light industrial automation — all applications where consistent tooth engagement and repeatable backlash matter.
C45 Steel Construction — Medium-carbon steel body delivers the structural rigidity needed for continuous-duty drive applications without excessive weight.
Heat-Treated Tooth Surface — Surface hardening extends tooth life under repetitive mesh loading, reducing wear-induced backlash growth over time.
Wide Tooth-Count Range (12 T – 60 T) — A single product family covers small pinion drives up to larger reduction stages, simplifying sourcing for multi-stage geartrains.
Multiple Bore & Keyway Options — Plain bores from 6 mm to 25 mm, plus keyway variants (4 mm / 5 mm / 6 mm / 8 mm), accommodate a broad range of motor and shaft standards.
Precision-Machined Hub — The integrated hub provides axial support and a consistent clamping surface, reducing shaft runout compared to hubless gears.
Standard Module 1.5 Pitch — Fully interchangeable with Mod 1.5 racks and mating gears, making replacement and system expansion straightforward.
| Module | 1.5 |
|---|---|
| Tooth Count | 12 T – 60 T (see variant options) |
| Pitch Diameter | 18 mm – 90 mm (0.71 in – 3.54 in) |
| Bore Diameter | 6 mm – 25 mm (see variant options) |
| Keyway | None / 4 mm / 5 mm / 6 mm / 8 mm (see variant options) |
| Material | C45 Medium-Carbon Steel |
| Surface Treatment | Heat-treated (surface hardened) |
| Hub | Integrated hub with set-screw interface |
| Pressure Angle | 20° |
| Face Width | See variant options |
| Finish | Natural steel / lightly oiled |
| Unit Sold | 1 piece per order (multi-pack available) |
Select tooth count based on your required gear ratio and available center distance. For a given ratio, divide the driven gear tooth count by the driver (pinion) tooth count. With Module 1.5, center distance = (T1 + T2) × 1.5 / 2 mm. Start with the smallest pinion that fits your motor shaft bore, then size the mating gear for the ratio you need.
Match the bore to your shaft diameter exactly. For a plain bore, the shaft should be a light press or close sliding fit. If your shaft has a flat or keyway, select the corresponding keyway variant (e.g., 12 mm + 4 mm Keyway for a 12 mm keyed shaft). Measure your shaft with calipers before ordering — nominal motor shaft sizes are typically 6, 8, 10, 12, 14, 15, 16, 18, 20, 22, 24, or 25 mm.
C45 steel with surface hardening provides good tooth bending strength and surface fatigue resistance for light-to-medium duty drives. Exact load ratings depend on tooth count, face width, speed, and lubrication. For continuous high-torque applications, consult standard gear-load calculation methods (e.g., AGMA or ISO 6336) using the gear's module and material properties.
C45 steel is not inherently corrosion-resistant. The gears are supplied with a light protective oil coating suitable for indoor, dry environments. For humid or outdoor use, apply a compatible gear lubricant or grease regularly, or consider stainless steel alternatives if corrosion is a primary concern.
Yes — all gears in this series follow the standard Module 1.5, 20° pressure angle specification. They will mesh correctly with any Mod 1.5 rack, pinion, or mating spur gear of the same module and pressure angle, regardless of brand, as long as tooth count and center distance are calculated correctly.
A plain bore with a set screw is adequate for low-to-moderate torque and unidirectional loads. A keyway is recommended when torque is high, direction reverses frequently, or precise angular positioning is required — the key prevents rotational slip between the gear and shaft. Check whether your shaft has a machined keyway slot before selecting a keyway variant.
For most CNC and automation applications, a light gear grease (NLGI #1 or #2) or a medium-viscosity gear oil applied to the tooth flanks is sufficient. Re-lubricate periodically based on operating hours and environment. Avoid dry running, which accelerates tooth wear on steel gears.
