Precision Spur Gears for Demanding Drive Applications
Stripped or mismatched gears create costly downtime for hobbyists and engineers alike. These 45# steel spur gears are machined to metric module standards (Mod 1 through Mod 5), giving you a reliable, drop-in solution for robotics, CNC builds, RC vehicles, and industrial drive trains where dimensional accuracy is non-negotiable.
Each gear is cut from 45# carbon steel and is available in module sizes 1, 1.5, 2, 2.5, 3, 4, and 5, with tooth counts ranging from 10T to 50T (10T–11T available on Mod 2–5). Thickness options span 10 mm, 15 mm, and up to 40 mm depending on the variant selected, with bore and hub dimensions scaled to the chosen module.
Typical use cases include precision gearbox assemblies, stepper-motor pinion stages, open-frame conveyor drives, and DIY automation projects requiring repeatable gear ratios and low backlash.
✅ Key Features of These Metric Module Spur Gears
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45# Carbon Steel Construction
Heat-treatable medium-carbon steel delivers a balance of surface hardness and core toughness suitable for moderate-to-high load applications.
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Full Module Range: Mod 1 – Mod 5
Seven module sizes in one listing — select the exact pitch that matches your existing gear train without custom machining.
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Wide Tooth Count Selection: 10T – 50T
Fine-tune your gear ratio by choosing from up to 41 tooth counts per module, covering both high-speed pinion and larger driven-gear roles.
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Multiple Thickness Options
Face widths of 10 mm, 15 mm, and up to 40 mm (varies by module) allow you to match load capacity and space constraints simultaneously.
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20° Pressure Angle — Industry Standard
Ensures interchangeability with the vast majority of metric module gears on the market, reducing sourcing complexity.
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Hobbed & Deburred Teeth
Gear teeth are hobbed for consistent involute profile accuracy and deburred for safe handling and immediate installation.
❓ Frequently Asked Questions
How do I choose the correct module size?
The module (Mod) must match between mating gears. Measure the pitch diameter of your existing gear and divide by the tooth count — the result is the module in millimeters. For example, a 40 mm pitch diameter gear with 20 teeth is Mod 2.
Are these gears compatible with imperial (DP) gear systems?
No. These are metric module gears with a 20° pressure angle. They are not interchangeable with diametral pitch (DP) gears used in imperial systems. Ensure your application uses metric module standards before ordering.
What is the bore diameter for each module?
Bore diameter scales with module size and tooth count. Please select your variant above to confirm the bore specification, or contact us to confirm before ordering if you have a specific shaft diameter requirement.
Can these gears handle high-torque or high-speed applications?
45# carbon steel provides good strength for moderate-to-high torque at low-to-medium speeds. For very high-speed or heavily loaded applications, consider heat treatment or surface hardening. Lubrication is recommended for continuous-duty use.
Is the steel corrosion-resistant?
45# carbon steel is not inherently corrosion-resistant. For outdoor or humid environments, apply a light machine oil or grease coating, or consider a protective surface treatment after installation.
What thickness (face width) should I select?
Face width affects load capacity — wider gears distribute load over more tooth surface area. Match the face width to your mating gear where possible. If your application has space constraints, a narrower face width with a larger module may be a better trade-off.
Can I order multiple pieces?
The default quantity is 1 Pcs per order. If you need larger quantities for a project or wholesale inquiry, please contact us directly for bulk pricing.
🛒 Select your module size, tooth count, and thickness above, then add to cart.
