Mod 2 Spur Gear C45 Steel with Hub 12 - 60 Tooth Motor Pinion Hardened Precision

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Mod 2 Spur Gear C45 Steel with Hub 12 - 60 Tooth Motor Pinion Hardened Precision

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By HomeDIYer®

Models: Module 2【12 Tooth】

Bore Size: 8mm

Amount: 1 pcs

Price:

$6.92 USD

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In stock (500 units), ready to be shipped

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Mod 2 Spur Gear C45 Steel — Precision Motor Pinion with Hub for Reliable Power Transmission

When a stripped or undersized gear brings your build to a halt, you need a replacement that fits precisely and holds up under load. Engineers, robotics builders, and CNC hobbyists working with Module 2 drive systems demand gears that mesh cleanly, resist wear, and mount securely — this Module 2 C45 steel spur gear with hub is designed exactly for that purpose.

Each gear is machined from C45 medium-carbon steel and features an integrated hub for secure shaft mounting. Bore options range from 8 mm (0.31 in) to 35 mm (1.38 in), with keyway slots available on larger bores to prevent rotational slip. Tooth counts span 12 to 40 teeth (Module 2), giving an outer diameter range of approximately 28 mm (1.10 in) to 84 mm (3.31 in). Face width is typically 20 mm (0.79 in); hub length and hub diameter vary by tooth count — see variant options for exact dimensions.

Typical use cases include DC motor pinion drives in robotics and automation platforms, rack-and-pinion linear actuators for CNC router axes, and gearbox stage reduction in small industrial machinery. Long-tail applications include Module 2 replacement pinion gear for stepper motor, C45 steel spur gear with keyway for servo drive, and hardened precision gear for 3D printer extruder drive.

⚙️ Compatibility: Module 2 (Mod 2) gear systems. Meshes with any standard Mod 2 spur gear, rack, or pinion of matching module. Verify bore diameter and keyway dimensions against your shaft before ordering.

✅ Key Features of These Mod 2 C45 Steel Spur Gears with Hub

🔩 C45 Medium-Carbon Steel Construction

Machined from C45 steel for a balanced combination of machinability, tensile strength, and surface hardness — suitable for continuous-duty drive applications.

🎯 Precision Module 2 Tooth Profile

Ground to standard Module 2 involute tooth geometry for smooth, low-noise meshing with any Mod 2 mating gear or rack.

🔑 Keyway Bore Options for Positive Drive

Larger bore variants include a machined keyway (4 mm, 5 mm, 6 mm, 8 mm, or 10 mm depending on bore size) to eliminate shaft slip under torque.

🏗️ Integrated Hub for Rigid Mounting

The extended hub provides additional bearing surface and allows set-screw or keyway retention, keeping the gear concentric and axially stable on the shaft.

📐 Wide Tooth Count Selection (12–40 Teeth)

Choose from 24 tooth-count variants to dial in your gear ratio without custom machining — from compact 12-tooth pinions to larger 40-tooth driven gears.

🔄 Hardened for Extended Service Life

Heat-treated tooth flanks resist pitting and wear under cyclic loading, extending service intervals in motor-driven and servo-driven applications.

📐 Technical Specifications — Module 2 C45 Steel Spur Gear

Module	2 (Mod 2)
Tooth Count Range	12 – 40 teeth (see variant options)
Pressure Angle	20°
Material	C45 medium-carbon steel
Surface Treatment	Heat-treated / hardened tooth flanks
Bore Diameter	8 mm – 35 mm (see variant options)
Keyway	4 mm / 5 mm / 6 mm / 8 mm / 10 mm (bore-dependent; see variant options)
Outer Diameter (approx.)	(Tooth count + 2) × 2 mm — e.g., 28 mm for 12T, 84 mm for 40T
Face Width	Typically 20 mm (0.79 in); see variant options
Hub Diameter / Length	See variant options
Tooth Profile	Standard involute
Gear Type	Spur gear with hub
Package Quantity	1 pcs per order (multi-pack options available)

❓ Frequently Asked Questions

How do I choose the right tooth count for my application?

Your gear ratio is determined by dividing the driven gear tooth count by the driving (pinion) gear tooth count. For example, pairing a 12-tooth pinion with a 36-tooth gear gives a 3:1 reduction. Select the tooth count that achieves your target speed or torque ratio. If you are replacing an existing gear, match the tooth count and module (Mod 2) of the original.

What bore size should I order for my motor shaft?

Measure your motor or gearbox output shaft diameter with a caliper. Select the bore option that matches — for example, an 8 mm shaft requires the 8 mm bore variant. For shafts 12 mm and above, we recommend choosing a keyway bore variant to prevent rotational slip under load. Confirm the keyway width matches your shaft key before ordering.

Will this gear mesh with my existing Module 2 rack or gear?

Yes — any standard Module 2 involute spur gear or rack with a 20° pressure angle will mesh correctly with these gears. Module (not tooth count) determines compatibility. Ensure the mating component is also labeled Mod 2 or Module 2.

How strong is C45 steel compared to other gear materials?

C45 steel (equivalent to AISI 1045) has a tensile strength of approximately 600–800 MPa in the normalized condition, rising to 700–1000 MPa after heat treatment. It offers significantly higher strength than aluminum or nylon gears and is suitable for moderate-to-high torque applications. For very high shock loads, consider upgrading to alloy steel gears.

Are these gears corrosion-resistant?

C45 steel is not inherently corrosion-resistant. For outdoor or humid environments, apply a light machine oil or anti-rust coating after installation. If corrosion resistance is a primary requirement, consider stainless steel or plastic gear alternatives for your application.

What is the difference between a plain bore and a keyway bore?

A plain bore (e.g., 8 mm or 10 mm) relies on a set screw or interference fit to secure the gear to the shaft. A keyway bore includes a machined slot that accepts a standard key, providing a positive mechanical lock that prevents the gear from rotating on the shaft under torque. Keyway bores are recommended for higher-torque or reversing-load applications.

Can I use these gears in a CNC router or 3D printer drive system?

Yes. Module 2 C45 steel spur gears are commonly used in CNC router rack-and-pinion drives, 3D printer extruder gearboxes, and laser cutter axis drives. Verify that your existing rack or mating gear is Module 2 and that the bore matches your stepper or servo motor shaft diameter.

🛒 Select your tooth count and bore size above, then add to cart.